path: root/mail/thunderbird/files/patch-rust-1.78.0

Adapted from https://hg.mozilla.org/mozilla-central/rev/1db2ef126a6a
--

# HG changeset patch
# User Henri Sivonen <hsivonen@hsivonen.fi>
# Date 1714462184 0
# Node ID 1db2ef126a6a8555dbf50345e16492c977b42e92
# Parent  a545e84b3674c4878f2e618b7bce23058f2ac690
Bug 1882209 - Update encoding_rs to 0.8.34 to deal with rustc changes. r=glandium,supply-chain-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D207167

diff --git a/.cargo/config.in b/.cargo/config.in
--- .cargo/config.in
+++ .cargo/config.in
@@ -35,31 +35,31 @@ git = "https://github.com/gfx-rs/wgpu"
 rev = "f71a1bc736fde37509262ca03e91d8f56a13aeb5"
 replace-with = "vendored-sources"
 
 [source."git+https://github.com/glandium/warp?rev=4af45fae95bc98b0eba1ef0db17e1dac471bb23d"]
 git = "https://github.com/glandium/warp"
 rev = "4af45fae95bc98b0eba1ef0db17e1dac471bb23d"
 replace-with = "vendored-sources"
 
+[source."git+https://github.com/hsivonen/any_all_workaround?rev=7fb1b7034c9f172aade21ee1c8554e8d8a48af80"]
+git = "https://github.com/hsivonen/any_all_workaround"
+rev = "7fb1b7034c9f172aade21ee1c8554e8d8a48af80"
+replace-with = "vendored-sources"
+
 [source."git+https://github.com/hsivonen/chardetng?rev=3484d3e3ebdc8931493aa5df4d7ee9360a90e76b"]
 git = "https://github.com/hsivonen/chardetng"
 rev = "3484d3e3ebdc8931493aa5df4d7ee9360a90e76b"
 replace-with = "vendored-sources"
 
 [source."git+https://github.com/hsivonen/chardetng_c?rev=ed8a4c6f900a90d4dbc1d64b856e61490a1c3570"]
 git = "https://github.com/hsivonen/chardetng_c"
 rev = "ed8a4c6f900a90d4dbc1d64b856e61490a1c3570"
 replace-with = "vendored-sources"
 
-[source."git+https://github.com/hsivonen/packed_simd?rev=e588ceb568878e1a3156ea9ce551d5b63ef0cdc4"]
-git = "https://github.com/hsivonen/packed_simd"
-rev = "e588ceb568878e1a3156ea9ce551d5b63ef0cdc4"
-replace-with = "vendored-sources"
-
 [source."git+https://github.com/jfkthame/mapped_hyph.git?rev=c7651a0cffff41996ad13c44f689bd9cd2192c01"]
 git = "https://github.com/jfkthame/mapped_hyph.git"
 rev = "c7651a0cffff41996ad13c44f689bd9cd2192c01"
 replace-with = "vendored-sources"
 
 [source."git+https://github.com/mozilla-spidermonkey/jsparagus?rev=64ba08e24749616de2344112f226d1ef4ba893ae"]
 git = "https://github.com/mozilla-spidermonkey/jsparagus"
 rev = "64ba08e24749616de2344112f226d1ef4ba893ae"
diff --git a/Cargo.lock b/Cargo.lock
--- Cargo.lock
+++ Cargo.lock
@@ -80,16 +80,25 @@ dependencies = [
 name = "android_system_properties"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
 dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "any_all_workaround"
+version = "0.1.0"
+source = "git+https://github.com/hsivonen/any_all_workaround?rev=7fb1b7034c9f172aade21ee1c8554e8d8a48af80#7fb1b7034c9f172aade21ee1c8554e8d8a48af80"
+dependencies = [
+ "cfg-if 1.0.0",
+ "version_check",
+]
+
 [[package]]
 name = "anyhow"
 version = "1.0.69"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "224afbd727c3d6e4b90103ece64b8d1b67fbb1973b1046c2281eed3f3803f800"
 
 [[package]]
 name = "app_services_logger"
@@ -1431,22 +1440,22 @@ dependencies = [
  "encoding_rs",
  "nserror",
  "nsstring",
  "xmldecl",
 ]
 
 [[package]]
 name = "encoding_rs"
-version = "0.8.33"
+version = "0.8.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7268b386296a025e474d5140678f75d6de9493ae55a5d709eeb9dd08149945e1"
+checksum = "b45de904aa0b010bce2ab45264d0631681847fa7b6f2eaa7dab7619943bc4f59"
 dependencies = [
+ "any_all_workaround",
  "cfg-if 1.0.0",
- "packed_simd",
 ]
 
 [[package]]
 name = "enum-primitive-derive"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c375b9c5eadb68d0a6efee2999fef292f45854c3444c86f09d8ab086ba942b0e"
 dependencies = [
@@ -3901,25 +3910,16 @@ checksum = "8d91edf4fbb970279443471345a4e8c491bf05bb283b3e6c88e4e606fd8c181b"
 [[package]]
 name = "oxilangtag-ffi"
 version = "0.1.0"
 dependencies = [
  "nsstring",
  "oxilangtag",
 ]
 
-[[package]]
-name = "packed_simd"
-version = "0.3.9"
-source = "git+https://github.com/hsivonen/packed_simd?rev=e588ceb568878e1a3156ea9ce551d5b63ef0cdc4#e588ceb568878e1a3156ea9ce551d5b63ef0cdc4"
-dependencies = [
- "cfg-if 1.0.0",
- "num-traits",
-]
-
 [[package]]
 name = "parking_lot"
 version = "0.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7d17b78036a60663b797adeaee46f5c9dfebb86948d1255007a1d6be0271ff99"
 dependencies = [
  "instant",
  "lock_api",
diff --git a/Cargo.toml b/Cargo.toml
--- Cargo.toml
+++ Cargo.toml
@@ -154,22 +154,22 @@ rure = { path = "third_party/rust/rure" }
 
 # 0.31.1 but without rust-cssparser#342.
 # TODO: Remove these, and just use v0.31.1 once bug 1836219 lands
 # (which will get syn 2 into the tree).
 cssparser = { path = "third_party/rust/cssparser" }
 cssparser-macros = { path = "third_party/rust/cssparser-macros" }
 
 # Other overrides
+any_all_workaround = { git = "https://github.com/hsivonen/any_all_workaround", rev = "7fb1b7034c9f172aade21ee1c8554e8d8a48af80" }
 chardetng = { git = "https://github.com/hsivonen/chardetng", rev="3484d3e3ebdc8931493aa5df4d7ee9360a90e76b" }
 chardetng_c = { git = "https://github.com/hsivonen/chardetng_c", rev="ed8a4c6f900a90d4dbc1d64b856e61490a1c3570" }
 coremidi = { git = "https://github.com/chris-zen/coremidi.git", rev="fc68464b5445caf111e41f643a2e69ccce0b4f83" }
 firefox-on-glean = { path = "toolkit/components/glean/api" }
 libudev-sys = { path = "dom/webauthn/libudev-sys" }
-packed_simd = { git = "https://github.com/hsivonen/packed_simd", rev = "e588ceb568878e1a3156ea9ce551d5b63ef0cdc4" }
 midir = { git = "https://github.com/mozilla/midir.git", rev = "519e651241e867af3391db08f9ae6400bc023e18" }
 # warp 0.3.3 + https://github.com/seanmonstar/warp/pull/1007
 warp = { git = "https://github.com/glandium/warp", rev = "4af45fae95bc98b0eba1ef0db17e1dac471bb23d" }
 
 # application-services overrides to make updating them all simpler.
 interrupt-support = { git = "https://github.com/mozilla/application-services", rev = "86c84c217036c12283d19368867323a66bf35883" }
 sql-support = { git = "https://github.com/mozilla/application-services", rev = "86c84c217036c12283d19368867323a66bf35883" }
 sync15 = { git = "https://github.com/mozilla/application-services", rev = "86c84c217036c12283d19368867323a66bf35883" }
diff --git a/config/makefiles/rust.mk b/config/makefiles/rust.mk
--- config/makefiles/rust.mk
+++ config/makefiles/rust.mk
@@ -260,17 +260,17 @@ export COREAUDIO_SDK_PATH=$(IPHONEOS_SDK
 export IPHONEOS_SDK_DIR
 PATH := $(topsrcdir)/build/macosx:$(PATH)
 endif
 endif
 
 ifndef RUSTC_BOOTSTRAP
 RUSTC_BOOTSTRAP := mozglue_static,qcms
 ifdef MOZ_RUST_SIMD
-RUSTC_BOOTSTRAP := $(RUSTC_BOOTSTRAP),encoding_rs,packed_simd
+RUSTC_BOOTSTRAP := $(RUSTC_BOOTSTRAP),encoding_rs,any_all_workaround
 endif
 export RUSTC_BOOTSTRAP
 endif
 
 target_rust_ltoable := force-cargo-library-build $(ADD_RUST_LTOABLE)
 target_rust_nonltoable := force-cargo-test-run force-cargo-program-build
 
 ifdef MOZ_PGO_RUST
diff --git a/supply-chain/audits.toml b/supply-chain/audits.toml
--- supply-chain/audits.toml
+++ supply-chain/audits.toml
@@ -596,16 +596,29 @@ who = "Mike Hommey <mh+mozilla@glandium.
 criteria = "safe-to-deploy"
 delta = "0.1.2 -> 0.1.4"
 
 [[audits.android_system_properties]]
 who = "Mike Hommey <mh+mozilla@glandium.org>"
 criteria = "safe-to-deploy"
 delta = "0.1.4 -> 0.1.5"
 
+[[audits.any_all_workaround]]
+who = "Henri Sivonen <hsivonen@hsivonen.fi>"
+criteria = "safe-to-deploy"
+version = "0.1.0"
+notes = "The little code that is in this crate I reviewed and modified from packed_simd (which has previously been vendored in full instead of just this small part)."
+
+[[audits.any_all_workaround]]
+who = "Henri Sivonen <hsivonen@hsivonen.fi>"
+criteria = "safe-to-deploy"
+delta = "0.1.0 -> 0.1.0@git:7fb1b7034c9f172aade21ee1c8554e8d8a48af80"
+importable = false
+notes = "This is a trivial workaround copied from elsewhere in m-c, specifically qcms."
+
 [[audits.anyhow]]
 who = "Mike Hommey <mh+mozilla@glandium.org>"
 criteria = "safe-to-deploy"
 delta = "1.0.57 -> 1.0.61"
 
 [[audits.anyhow]]
 who = "Bobby Holley <bobbyholley@gmail.com>"
 criteria = "safe-to-deploy"
diff --git a/supply-chain/config.toml b/supply-chain/config.toml
--- supply-chain/config.toml
+++ supply-chain/config.toml
@@ -14,16 +14,20 @@ url = "https://raw.githubusercontent.com
 url = "https://raw.githubusercontent.com/google/supply-chain/main/audits.toml"
 
 [imports.isrg]
 url = "https://raw.githubusercontent.com/divviup/libprio-rs/main/supply-chain/audits.toml"
 
 [imports.mozilla]
 url = "https://raw.githubusercontent.com/mozilla/supply-chain/main/audits.toml"
 
+[policy.any_all_workaround]
+audit-as-crates-io = true
+notes = "This is the upstream code plus the ARM intrinsics workaround from qcms, see bug 1882209."
+
 [policy.autocfg]
 audit-as-crates-io = true
 notes = "This is the upstream code plus a few local fixes, see bug 1685697."
 
 [policy.chardetng]
 audit-as-crates-io = true
 notes = "This is a crate Henri wrote which is also published. We should probably update Firefox to tip and certify that."
 
diff --git a/supply-chain/imports.lock b/supply-chain/imports.lock
--- supply-chain/imports.lock
+++ supply-chain/imports.lock
@@ -115,16 +115,23 @@ user-name = "David Tolnay"
 
 [[publisher.encoding_rs]]
 version = "0.8.33"
 when = "2023-08-23"
 user-id = 4484
 user-login = "hsivonen"
 user-name = "Henri Sivonen"
 
+[[publisher.encoding_rs]]
+version = "0.8.34"
+when = "2024-04-10"
+user-id = 4484
+user-login = "hsivonen"
+user-name = "Henri Sivonen"
+
 [[publisher.etagere]]
 version = "0.2.7"
 when = "2022-05-04"
 user-id = 1281
 user-login = "nical"
 user-name = "Nicolas Silva"
 
 [[publisher.euclid]]
diff --git a/third_party/rust/any_all_workaround/.cargo-checksum.json b/third_party/rust/any_all_workaround/.cargo-checksum.json
new file mode 100644
--- /dev/null
+++ third_party/rust/any_all_workaround/.cargo-checksum.json
@@ -0,0 +1,1 @@
+{"files":{"Cargo.toml":"f8c127449dc9432d404c21c99833e4617ab88a797445af249a7fe3c989985d6d","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"6485b8ed310d3f0340bf1ad1f47645069ce4069dcc6bb46c7d5c6faf41de1fdb","LICENSE-MIT-QCMS":"36d847ae882f6574ebc72f56a4f354e4f104fde4a584373496482e97d52d31bc","README.md":"4c617b8ced3a27b7edecf0e5e41ed451c04e88dab529e7a35fccc4e1551efbd7","build.rs":"56b29ab6da3e49075bfd0a7b690267c8016298bf0d332e2e68bbaf19decbbf71","src/lib.rs":"7118106690b9d25c5d0a3e2079feb83d76f1d434d0da36b9d0351806d27c850d"},"package":null}
\ No newline at end of file
diff --git a/third_party/rust/any_all_workaround/Cargo.toml b/third_party/rust/any_all_workaround/Cargo.toml
new file mode 100644
--- /dev/null
+++ third_party/rust/any_all_workaround/Cargo.toml
@@ -0,0 +1,28 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2021"
+name = "any_all_workaround"
+version = "0.1.0"
+authors = ["Henri Sivonen <hsivonen@hsivonen.fi>"]
+description = "Workaround for bad LLVM codegen for boolean reductions on 32-bit ARM"
+homepage = "https://docs.rs/any_all_workaround/"
+documentation = "https://docs.rs/any_all_workaround/"
+readme = "README.md"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/hsivonen/any_all_workaround"
+
+[dependencies]
+cfg-if = "1.0"
+
+[build-dependencies]
+version_check = "0.9"
diff --git a/third_party/rust/packed_simd/LICENSE-APACHE b/third_party/rust/any_all_workaround/LICENSE-APACHE
rename from third_party/rust/packed_simd/LICENSE-APACHE
rename to third_party/rust/any_all_workaround/LICENSE-APACHE
diff --git a/third_party/rust/packed_simd/LICENSE-MIT b/third_party/rust/any_all_workaround/LICENSE-MIT
rename from third_party/rust/packed_simd/LICENSE-MIT
rename to third_party/rust/any_all_workaround/LICENSE-MIT
diff --git a/third_party/rust/any_all_workaround/LICENSE-MIT-QCMS b/third_party/rust/any_all_workaround/LICENSE-MIT-QCMS
new file mode 100644
--- /dev/null
+++ third_party/rust/any_all_workaround/LICENSE-MIT-QCMS
@@ -0,0 +1,21 @@
+qcms
+Copyright (C) 2009-2024 Mozilla Corporation
+Copyright (C) 1998-2007 Marti Maria
+
+Permission is hereby granted, free of charge, to any person obtaining 
+a copy of this software and associated documentation files (the "Software"), 
+to deal in the Software without restriction, including without limitation 
+the rights to use, copy, modify, merge, publish, distribute, sublicense, 
+and/or sell copies of the Software, and to permit persons to whom the Software 
+is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in 
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO 
+THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/third_party/rust/any_all_workaround/README.md b/third_party/rust/any_all_workaround/README.md
new file mode 100644
--- /dev/null
+++ third_party/rust/any_all_workaround/README.md
@@ -0,0 +1,13 @@
+# any_all_workaround
+
+This is a workaround for bad codegen ([Rust bug](https://github.com/rust-lang/portable-simd/issues/146), [LLVM bug](https://github.com/llvm/llvm-project/issues/50466)) for the `any()` and `all()` reductions for NEON-backed SIMD vectors on 32-bit ARM. On other platforms these delegate to `any()` and `all()` in `core::simd`.
+
+The plan is to abandon this crate once the LLVM bug is fixed or `core::simd` works around the LLVM bug.
+
+The code is forked from the [`packed_simd` crate](https://raw.githubusercontent.com/hsivonen/packed_simd/d938e39bee9bc5c222f5f2f2a0df9e53b5ce36ae/src/codegen/reductions/mask/arm.rs).
+
+This crate requires Nightly Rust as it depends on the `portable_simd` feature.
+
+# License
+
+`MIT OR Apache-2.0`, since that's how `packed_simd` is licensed. (The ARM intrinsics Rust version workaround is from qcms, see LICENSE-MIT-QCMS.)
diff --git a/third_party/rust/any_all_workaround/build.rs b/third_party/rust/any_all_workaround/build.rs
new file mode 100644
--- /dev/null
+++ third_party/rust/any_all_workaround/build.rs
@@ -0,0 +1,7 @@
+extern crate version_check as rustc;
+
+fn main() {
+    if rustc::is_min_version("1.78.0").unwrap_or(false) {
+        println!("cargo:rustc-cfg=stdsimd_split");
+    }
+}
diff --git a/third_party/rust/any_all_workaround/src/lib.rs b/third_party/rust/any_all_workaround/src/lib.rs
new file mode 100644
--- /dev/null
+++ third_party/rust/any_all_workaround/src/lib.rs
@@ -0,0 +1,110 @@
+// This code began as a fork of
+// https://raw.githubusercontent.com/rust-lang/packed_simd/d938e39bee9bc5c222f5f2f2a0df9e53b5ce36ae/src/codegen/reductions/mask/arm.rs
+// which didn't have a license header on the file, but Cargo.toml said "MIT OR Apache-2.0".
+// See LICENSE-MIT and LICENSE-APACHE.
+
+#![no_std]
+#![feature(portable_simd)]
+#![cfg_attr(
+    all(
+        stdsimd_split,
+        target_arch = "arm",
+        target_endian = "little",
+        target_feature = "neon",
+        target_feature = "v7"
+    ),
+    feature(stdarch_arm_neon_intrinsics)
+)]
+#![cfg_attr(
+    all(
+        not(stdsimd_split),
+        target_arch = "arm",
+        target_endian = "little",
+        target_feature = "neon",
+        target_feature = "v7"
+    ),
+    feature(stdsimd)
+)]
+
+use cfg_if::cfg_if;
+use core::simd::mask16x8;
+use core::simd::mask32x4;
+use core::simd::mask8x16;
+
+cfg_if! {
+    if #[cfg(all(target_arch = "arm", target_endian = "little", target_feature = "neon", target_feature = "v7"))] {
+        use core::simd::mask8x8;
+        use core::simd::mask16x4;
+        use core::simd::mask32x2;
+        macro_rules! arm_128_v7_neon_impl {
+            ($all:ident, $any:ident, $id:ident, $half:ident, $vpmin:ident, $vpmax:ident) => {
+                #[inline]
+                pub fn $all(s: $id) -> bool {
+                    use core::arch::arm::$vpmin;
+                    use core::mem::transmute;
+                    unsafe {
+                        union U {
+                            halves: ($half, $half),
+                            vec: $id,
+                        }
+                        let halves = U { vec: s }.halves;
+                        let h: $half = transmute($vpmin(transmute(halves.0), transmute(halves.1)));
+                        h.all()
+                    }
+                }
+                #[inline]
+                pub fn $any(s: $id) -> bool {
+                    use core::arch::arm::$vpmax;
+                    use core::mem::transmute;
+                    unsafe {
+                        union U {
+                            halves: ($half, $half),
+                            vec: $id,
+                        }
+                        let halves = U { vec: s }.halves;
+                        let h: $half = transmute($vpmax(transmute(halves.0), transmute(halves.1)));
+                        h.any()
+                    }
+                }
+            }
+        }
+    } else {
+        macro_rules! arm_128_v7_neon_impl {
+            ($all:ident, $any:ident, $id:ident, $half:ident, $vpmin:ident, $vpmax:ident) => {
+                #[inline(always)]
+                pub fn $all(s: $id) -> bool {
+                    s.all()
+                }
+                #[inline(always)]
+                pub fn $any(s: $id) -> bool {
+                    s.any()
+                }
+            }
+        }
+    }
+}
+
+arm_128_v7_neon_impl!(
+    all_mask8x16,
+    any_mask8x16,
+    mask8x16,
+    mask8x8,
+    vpmin_u8,
+    vpmax_u8
+);
+arm_128_v7_neon_impl!(
+    all_mask16x8,
+    any_mask16x8,
+    mask16x8,
+    mask16x4,
+    vpmin_u16,
+    vpmax_u16
+);
+arm_128_v7_neon_impl!(
+    all_mask32x4,
+    any_mask32x4,
+    mask32x4,
+    mask32x2,
+    vpmin_u32,
+    vpmax_u32
+);
diff --git a/third_party/rust/encoding_rs/Cargo.toml b/third_party/rust/encoding_rs/Cargo.toml
--- third_party/rust/encoding_rs/Cargo.toml
+++ third_party/rust/encoding_rs/Cargo.toml
@@ -6,18 +6,19 @@
 # to registry (e.g., crates.io) dependencies.
 #
 # If you are reading this file be aware that the original Cargo.toml
 # will likely look very different (and much more reasonable).
 # See Cargo.toml.orig for the original contents.
 
 [package]
 edition = "2018"
+rust-version = "1.36"
 name = "encoding_rs"
-version = "0.8.33"
+version = "0.8.34"
 authors = ["Henri Sivonen <hsivonen@hsivonen.fi>"]
 description = "A Gecko-oriented implementation of the Encoding Standard"
 homepage = "https://docs.rs/encoding_rs/"
 documentation = "https://docs.rs/encoding_rs/"
 readme = "README.md"
 keywords = [
     "encoding",
     "web",
@@ -31,23 +32,23 @@ categories = [
     "internationalization",
 ]
 license = "(Apache-2.0 OR MIT) AND BSD-3-Clause"
 repository = "https://github.com/hsivonen/encoding_rs"
 
 [profile.release]
 lto = true
 
+[dependencies.any_all_workaround]
+version = "0.1.0"
+optional = true
+
 [dependencies.cfg-if]
 version = "1.0"
 
-[dependencies.packed_simd]
-version = "0.3.9"
-optional = true
-
 [dependencies.serde]
 version = "1.0"
 optional = true
 
 [dev-dependencies.bincode]
 version = "1.0"
 
 [dev-dependencies.serde_derive]
@@ -69,15 +70,9 @@ fast-legacy-encode = [
     "fast-hanja-encode",
     "fast-kanji-encode",
     "fast-gb-hanzi-encode",
     "fast-big5-hanzi-encode",
 ]
 less-slow-big5-hanzi-encode = []
 less-slow-gb-hanzi-encode = []
 less-slow-kanji-encode = []
-simd-accel = [
-    "packed_simd",
-    "packed_simd/into_bits",
-]
-
-[badges.travis-ci]
-repository = "hsivonen/encoding_rs"
+simd-accel = ["any_all_workaround"]
diff --git a/third_party/rust/encoding_rs/README.md b/third_party/rust/encoding_rs/README.md
--- third_party/rust/encoding_rs/README.md
+++ third_party/rust/encoding_rs/README.md
@@ -162,50 +162,36 @@ wrappers.
 * [C++](https://github.com/hsivonen/recode_cpp)
 
 ## Optional features
 
 There are currently these optional cargo features:
 
 ### `simd-accel`
 
-Enables SIMD acceleration using the nightly-dependent `packed_simd` crate.
+Enables SIMD acceleration using the nightly-dependent `portable_simd` standard
+library feature.
 
 This is an opt-in feature, because enabling this feature _opts out_ of Rust's
 guarantees of future compilers compiling old code (aka. "stability story").
 
 Currently, this has not been tested to be an improvement except for these
-targets:
+targets and enabling the `simd-accel` feature is expected to break the build
+on other targets:
 
 * x86_64
 * i686
 * aarch64
 * thumbv7neon
 
 If you use nightly Rust, you use targets whose first component is one of the
 above, and you are prepared _to have to revise your configuration when updating
 Rust_, you should enable this feature. Otherwise, please _do not_ enable this
 feature.
 
-_Note!_ If you are compiling for a target that does not have 128-bit SIMD
-enabled as part of the target definition and you are enabling 128-bit SIMD
-using `-C target_feature`, you need to enable the `core_arch` Cargo feature
-for `packed_simd` to compile a crates.io snapshot of `core_arch` instead of
-using the standard-library copy of `core::arch`, because the `core::arch`
-module of the pre-compiled standard library has been compiled with the
-assumption that the CPU doesn't have 128-bit SIMD. At present this applies
-mainly to 32-bit ARM targets whose first component does not include the
-substring `neon`.
-
-The encoding_rs side of things has not been properly set up for POWER,
-PowerPC, MIPS, etc., SIMD at this time, so even if you were to follow
-the advice from the previous paragraph, you probably shouldn't use
-the `simd-accel` option on the less mainstream architectures at this
-time.
-
 Used by Firefox.
 
 ### `serde`
 
 Enables support for serializing and deserializing `&'static Encoding`-typed
 struct fields using [Serde][1].
 
 [1]: https://serde.rs/
@@ -376,18 +362,19 @@ It is a goal to support the latest stabl
 the version of Rust that's used for Firefox Nightly.
 
 At this time, there is no firm commitment to support a version older than
 what's required by Firefox, and there is no commitment to treat MSRV changes
 as semver-breaking, because this crate depends on `cfg-if`, which doesn't
 appear to treat MSRV changes as semver-breaking, so it would be useless for
 this crate to treat MSRV changes as semver-breaking.
 
-As of 2021-02-04, MSRV appears to be Rust 1.36.0 for using the crate and
+As of 2024-04-04, MSRV appears to be Rust 1.36.0 for using the crate and
 1.42.0 for doc tests to pass without errors about the global allocator.
+With the `simd-accel` feature, the MSRV is even higher.
 
 ## Compatibility with rust-encoding
 
 A compatibility layer that implements the rust-encoding API on top of
 encoding_rs is
 [provided as a separate crate](https://github.com/hsivonen/encoding_rs_compat)
 (cannot be uploaded to crates.io). The compatibility layer was originally
 written with the assuption that Firefox would need it, but it is not currently
@@ -441,20 +428,27 @@ To regenerate the generated code:
 - [x] Implement the rust-encoding API in terms of encoding_rs.
 - [x] Add SIMD acceleration for Aarch64.
 - [x] Investigate the use of NEON on 32-bit ARM.
 - [ ] ~Investigate Björn Höhrmann's lookup table acceleration for UTF-8 as
       adapted to Rust in rust-encoding.~
 - [x] Add actually fast CJK encode options.
 - [ ] ~Investigate [Bob Steagall's lookup table acceleration for UTF-8](https://github.com/BobSteagall/CppNow2018/blob/master/FastConversionFromUTF-8/Fast%20Conversion%20From%20UTF-8%20with%20C%2B%2B%2C%20DFAs%2C%20and%20SSE%20Intrinsics%20-%20Bob%20Steagall%20-%20C%2B%2BNow%202018.pdf).~
 - [x] Provide a build mode that works without `alloc` (with lesser API surface).
-- [ ] Migrate to `std::simd` once it is stable and declare 1.0.
+- [x] Migrate to `std::simd` ~once it is stable and declare 1.0.~
+- [ ] Migrate `unsafe` slice access by larger types than `u8`/`u16` to `align_to`.
 
 ## Release Notes
 
+### 0.8.34
+
+* Use the `portable_simd` nightly feature of the standard library instead of the `packed_simd` crate. Only affects the `simd-accel` optional nightly feature.
+* Internal documentation improvements and minor code improvements around `unsafe`.
+* Added `rust-version` to `Cargo.toml`.
+
 ### 0.8.33
 
 * Use `packed_simd` instead of `packed_simd_2` again now that updates are back under the `packed_simd` name. Only affects the `simd-accel` optional nightly feature.
 
 ### 0.8.32
 
 * Removed `build.rs`. (This removal should resolve false positives reported by some antivirus products. This may break some build configurations that have opted out of Rust's guarantees against future build breakage.)
 * Internal change to what API is used for reinterpreting the lane configuration of SIMD vectors.
diff --git a/third_party/rust/encoding_rs/src/ascii.rs b/third_party/rust/encoding_rs/src/ascii.rs
--- third_party/rust/encoding_rs/src/ascii.rs
+++ third_party/rust/encoding_rs/src/ascii.rs
@@ -46,71 +46,87 @@ cfg_if! {
         #[allow(dead_code)]
         #[inline(always)]
         fn likely(b: bool) -> bool {
             b
         }
     }
 }
 
+// Safety invariants for masks: data & mask = 0 for valid ASCII or basic latin utf-16
+
 // `as` truncates, so works on 32-bit, too.
 #[allow(dead_code)]
 pub const ASCII_MASK: usize = 0x8080_8080_8080_8080u64 as usize;
 
 // `as` truncates, so works on 32-bit, too.
 #[allow(dead_code)]
 pub const BASIC_LATIN_MASK: usize = 0xFF80_FF80_FF80_FF80u64 as usize;
 
 #[allow(unused_macros)]
 macro_rules! ascii_naive {
     ($name:ident, $src_unit:ty, $dst_unit:ty) => {
+        /// Safety: src and dst must have len_unit elements and be aligned
+        /// Safety-usable invariant: will return Some() when it fails
+        /// to convert. The first value will be a u8 that is > 127.
         #[inline(always)]
         pub unsafe fn $name(
             src: *const $src_unit,
             dst: *mut $dst_unit,
             len: usize,
         ) -> Option<($src_unit, usize)> {
             // Yes, manually omitting the bound check here matters
             // a lot for perf.
             for i in 0..len {
+                // Safety: len invariant used here
                 let code_unit = *(src.add(i));
+                // Safety: Upholds safety-usable invariant here
                 if code_unit > 127 {
                     return Some((code_unit, i));
                 }
+                // Safety: len invariant used here
                 *(dst.add(i)) = code_unit as $dst_unit;
             }
             return None;
         }
     };
 }
 
 #[allow(unused_macros)]
 macro_rules! ascii_alu {
     ($name:ident,
+     // safety invariant: src/dst MUST be u8
      $src_unit:ty,
      $dst_unit:ty,
+     // Safety invariant: stride_fn must consume and produce two usizes, and return the index of the first non-ascii when it fails
      $stride_fn:ident) => {
+        /// Safety: src and dst must have len elements, src is valid for read, dst is valid for
+        /// write
+        /// Safety-usable invariant: will return Some() when it fails
+        /// to convert. The first value will be a u8 that is > 127.
         #[cfg_attr(feature = "cargo-clippy", allow(never_loop, cast_ptr_alignment))]
         #[inline(always)]
         pub unsafe fn $name(
             src: *const $src_unit,
             dst: *mut $dst_unit,
             len: usize,
         ) -> Option<($src_unit, usize)> {
             let mut offset = 0usize;
             // This loop is only broken out of as a `goto` forward
             loop {
+                // Safety: until_alignment becomes the number of bytes we need to munch until we are aligned to usize
                 let mut until_alignment = {
                     // Check if the other unit aligns if we move the narrower unit
                     // to alignment.
                     //               if ::core::mem::size_of::<$src_unit>() == ::core::mem::size_of::<$dst_unit>() {
                     // ascii_to_ascii
                     let src_alignment = (src as usize) & ALU_ALIGNMENT_MASK;
                     let dst_alignment = (dst as usize) & ALU_ALIGNMENT_MASK;
                     if src_alignment != dst_alignment {
+                        // Safety: bails early and ends up in the naïve branch where usize-alignment doesn't matter
                         break;
                     }
                     (ALU_ALIGNMENT - src_alignment) & ALU_ALIGNMENT_MASK
                     //               } else if ::core::mem::size_of::<$src_unit>() < ::core::mem::size_of::<$dst_unit>() {
                     // ascii_to_basic_latin
                     //                   let src_until_alignment = (ALIGNMENT - ((src as usize) & ALIGNMENT_MASK)) & ALIGNMENT_MASK;
                     //                   if (dst.add(src_until_alignment) as usize) & ALIGNMENT_MASK != 0 {
                     //                       break;
@@ -129,74 +145,104 @@ macro_rules! ascii_alu {
                     // Moving pointers to alignment seems to be a pessimization on
                     // x86_64 for operations that have UTF-16 as the internal
                     // Unicode representation. However, since it seems to be a win
                     // on ARM (tested ARMv7 code running on ARMv8 [rpi3]), except
                     // mixed results when encoding from UTF-16 and since x86 and
                     // x86_64 should be using SSE2 in due course, keeping the move
                     // to alignment here. It would be good to test on more ARM CPUs
                     // and on real MIPS and POWER hardware.
+                    //
+                    // Safety: This is the naïve code once again, for `until_alignment` bytes
                     while until_alignment != 0 {
                         let code_unit = *(src.add(offset));
                         if code_unit > 127 {
+                            // Safety: Upholds safety-usable invariant here
                             return Some((code_unit, offset));
                         }
                         *(dst.add(offset)) = code_unit as $dst_unit;
+                        // Safety: offset is the number of bytes copied so far
                         offset += 1;
                         until_alignment -= 1;
                     }
                     let len_minus_stride = len - ALU_STRIDE_SIZE;
                     loop {
+                        // Safety: num_ascii is known to be a byte index of a non-ascii byte due to stride_fn's invariant
                         if let Some(num_ascii) = $stride_fn(
+                            // Safety: These are known to be valid and aligned since we have at
+                            // least ALU_STRIDE_SIZE data in these buffers, and offset is the
+                            // number of elements copied so far, which according to the
+                            // until_alignment calculation above will cause both src and dst to be
+                            // aligned to usize after this add
                             src.add(offset) as *const usize,
                             dst.add(offset) as *mut usize,
                         ) {
                             offset += num_ascii;
+                            // Safety: Upholds safety-usable invariant here by indexing into non-ascii byte
                             return Some((*(src.add(offset)), offset));
                         }
+                        // Safety: offset continues to be the number of bytes copied so far, and
+                        // maintains usize alignment for the next loop iteration
                         offset += ALU_STRIDE_SIZE;
+                        // Safety: This is `offset > len - stride. This loop will continue as long as
+                        // `offset <= len - stride`, which means there are `stride` bytes to still be read.
                         if offset > len_minus_stride {
                             break;
                         }
                     }
                 }
                 break;
             }
+
+            // Safety: This is the naïve code, same as ascii_naive, and has no requirements
+            // other than src/dst being valid for the the right lens
             while offset < len {
+                // Safety: len invariant used here
                 let code_unit = *(src.add(offset));
                 if code_unit > 127 {
+                    // Safety: Upholds safety-usable invariant here
                     return Some((code_unit, offset));
                 }
+                // Safety: len invariant used here
                 *(dst.add(offset)) = code_unit as $dst_unit;
                 offset += 1;
             }
             None
         }
     };
 }
 
 #[allow(unused_macros)]
 macro_rules! basic_latin_alu {
     ($name:ident,
+    // safety invariant: use u8 for src/dest for ascii, and u16 for basic_latin
      $src_unit:ty,
      $dst_unit:ty,
+    // safety invariant: stride function must munch ALU_STRIDE_SIZE*size(src_unit) bytes off of src and
+    // write ALU_STRIDE_SIZE*size(dst_unit) bytes to dst
      $stride_fn:ident) => {
+        /// Safety: src and dst must have len elements, src is valid for read, dst is valid for
+        /// write
+        /// Safety-usable invariant: will return Some() when it fails
+        /// to convert. The first value will be a u8 that is > 127.
         #[cfg_attr(
             feature = "cargo-clippy",
             allow(never_loop, cast_ptr_alignment, cast_lossless)
         )]
         #[inline(always)]
         pub unsafe fn $name(
             src: *const $src_unit,
             dst: *mut $dst_unit,
             len: usize,
         ) -> Option<($src_unit, usize)> {
             let mut offset = 0usize;
             // This loop is only broken out of as a `goto` forward
             loop {
+                // Safety: until_alignment becomes the number of bytes we need to munch from src/dest until we are aligned to usize
+                // We ensure basic-latin has the same alignment as ascii, starting with ascii since it is smaller.
                 let mut until_alignment = {
                     // Check if the other unit aligns if we move the narrower unit
                     // to alignment.
                     //               if ::core::mem::size_of::<$src_unit>() == ::core::mem::size_of::<$dst_unit>() {
                     // ascii_to_ascii
                     //                   let src_alignment = (src as usize) & ALIGNMENT_MASK;
                     //                   let dst_alignment = (dst as usize) & ALIGNMENT_MASK;
                     //                   if src_alignment != dst_alignment {
@@ -232,66 +278,89 @@ macro_rules! basic_latin_alu {
                     // Moving pointers to alignment seems to be a pessimization on
                     // x86_64 for operations that have UTF-16 as the internal
                     // Unicode representation. However, since it seems to be a win
                     // on ARM (tested ARMv7 code running on ARMv8 [rpi3]), except
                     // mixed results when encoding from UTF-16 and since x86 and
                     // x86_64 should be using SSE2 in due course, keeping the move
                     // to alignment here. It would be good to test on more ARM CPUs
                     // and on real MIPS and POWER hardware.
+                    //
+                    // Safety: This is the naïve code once again, for `until_alignment` bytes
                     while until_alignment != 0 {
                         let code_unit = *(src.add(offset));
                         if code_unit > 127 {
+                            // Safety: Upholds safety-usable invariant here
                             return Some((code_unit, offset));
                         }
                         *(dst.add(offset)) = code_unit as $dst_unit;
+                        // Safety: offset is the number of bytes copied so far
                         offset += 1;
                         until_alignment -= 1;
                     }
                     let len_minus_stride = len - ALU_STRIDE_SIZE;
                     loop {
                         if !$stride_fn(
+                            // Safety: These are known to be valid and aligned since we have at
+                            // least ALU_STRIDE_SIZE data in these buffers, and offset is the
+                            // number of elements copied so far, which according to the
+                            // until_alignment calculation above will cause both src and dst to be
+                            // aligned to usize after this add
                             src.add(offset) as *const usize,
                             dst.add(offset) as *mut usize,
                         ) {
                             break;
                         }
+                        // Safety: offset continues to be the number of bytes copied so far, and
+                        // maintains usize alignment for the next loop iteration
                         offset += ALU_STRIDE_SIZE;
+                        // Safety: This is `offset > len - stride. This loop will continue as long as
+                        // `offset <= len - stride`, which means there are `stride` bytes to still be read.
                         if offset > len_minus_stride {
                             break;
                         }
                     }
                 }
                 break;
             }
+            // Safety: This is the naïve code once again, for leftover bytes
             while offset < len {
+                // Safety: len invariant used here
                 let code_unit = *(src.add(offset));
                 if code_unit > 127 {
+                    // Safety: Upholds safety-usable invariant here
                     return Some((code_unit, offset));
                 }
+                // Safety: len invariant used here
                 *(dst.add(offset)) = code_unit as $dst_unit;
                 offset += 1;
             }
             None
         }
     };
 }
 
 #[allow(unused_macros)]
 macro_rules! latin1_alu {
+    // safety invariant: stride function must munch ALU_STRIDE_SIZE*size(src_unit) bytes off of src and
+    // write ALU_STRIDE_SIZE*size(dst_unit) bytes to dst
     ($name:ident, $src_unit:ty, $dst_unit:ty, $stride_fn:ident) => {
+        /// Safety: src and dst must have len elements, src is valid for read, dst is valid for
+        /// write
         #[cfg_attr(
             feature = "cargo-clippy",
             allow(never_loop, cast_ptr_alignment, cast_lossless)
         )]
         #[inline(always)]
         pub unsafe fn $name(src: *const $src_unit, dst: *mut $dst_unit, len: usize) {
             let mut offset = 0usize;
             // This loop is only broken out of as a `goto` forward
             loop {
+                // Safety: until_alignment becomes the number of bytes we need to munch from src/dest until we are aligned to usize
+                // We ensure the UTF-16 side has the same alignment as the Latin-1 side, starting with Latin-1 since it is smaller.
                 let mut until_alignment = {
                     if ::core::mem::size_of::<$src_unit>() < ::core::mem::size_of::<$dst_unit>() {
                         // unpack
                         let src_until_alignment = (ALU_ALIGNMENT
                             - ((src as usize) & ALU_ALIGNMENT_MASK))
                             & ALU_ALIGNMENT_MASK;
                         if (dst.wrapping_add(src_until_alignment) as usize) & ALU_ALIGNMENT_MASK
                             != 0
@@ -308,373 +377,485 @@ macro_rules! latin1_alu {
                             != 0
                         {
                             break;
                         }
                         dst_until_alignment
                     }
                 };
                 if until_alignment + ALU_STRIDE_SIZE <= len {
+                    // Safety: This is the naïve code once again, for `until_alignment` bytes
                     while until_alignment != 0 {
                         let code_unit = *(src.add(offset));
                         *(dst.add(offset)) = code_unit as $dst_unit;
+                        // Safety: offset is the number of bytes copied so far
                         offset += 1;
                         until_alignment -= 1;
                     }
                     let len_minus_stride = len - ALU_STRIDE_SIZE;
                     loop {
                         $stride_fn(
+                            // Safety: These are known to be valid and aligned since we have at
+                            // least ALU_STRIDE_SIZE data in these buffers, and offset is the
+                            // number of elements copied so far, which according to the
+                            // until_alignment calculation above will cause both src and dst to be
+                            // aligned to usize after this add
                             src.add(offset) as *const usize,
                             dst.add(offset) as *mut usize,
                         );
+                        // Safety: offset continues to be the number of bytes copied so far, and
+                        // maintains usize alignment for the next loop iteration
                         offset += ALU_STRIDE_SIZE;
+                        // Safety: This is `offset > len - stride. This loop will continue as long as
+                        // `offset <= len - stride`, which means there are `stride` bytes to still be read.
                         if offset > len_minus_stride {
                             break;
                         }
                     }
                 }
                 break;
             }
+            // Safety: This is the naïve code once again, for leftover bytes
             while offset < len {
+                // Safety: len invariant used here
                 let code_unit = *(src.add(offset));
                 *(dst.add(offset)) = code_unit as $dst_unit;
                 offset += 1;
             }
         }
     };
 }
 
 #[allow(unused_macros)]
 macro_rules! ascii_simd_check_align {
     (
         $name:ident,
         $src_unit:ty,
         $dst_unit:ty,
+        // Safety: This function must require aligned src/dest that are valid for reading/writing SIMD_STRIDE_SIZE src_unit/dst_unit
         $stride_both_aligned:ident,
+        // Safety: This function must require aligned/unaligned src/dest that are valid for reading/writing SIMD_STRIDE_SIZE src_unit/dst_unit
         $stride_src_aligned:ident,
+        // Safety: This function must require unaligned/aligned src/dest that are valid for reading/writing SIMD_STRIDE_SIZE src_unit/dst_unit
         $stride_dst_aligned:ident,
+        // Safety: This function must require unaligned src/dest that are valid for reading/writing SIMD_STRIDE_SIZE src_unit/dst_unit
         $stride_neither_aligned:ident
     ) => {
+        /// Safety: src/dst must be valid for reads/writes of `len` elements of their units.
+        ///
+        /// Safety-usable invariant: will return Some() when it encounters non-ASCII, with the first element in the Some being
+        /// guaranteed to be non-ASCII (> 127), and the second being the offset where it is found
         #[inline(always)]
         pub unsafe fn $name(
             src: *const $src_unit,
             dst: *mut $dst_unit,
             len: usize,
         ) -> Option<($src_unit, usize)> {
             let mut offset = 0usize;
+            // Safety: if this check succeeds we're valid for reading/writing at least `SIMD_STRIDE_SIZE` elements.
             if SIMD_STRIDE_SIZE <= len {
                 let len_minus_stride = len - SIMD_STRIDE_SIZE;
                 // XXX Should we first process one stride unconditionally as unaligned to
                 // avoid the cost of the branchiness below if the first stride fails anyway?
                 // XXX Should we just use unaligned SSE2 access unconditionally? It seems that
                 // on Haswell, it would make sense to just use unaligned and not bother
                 // checking. Need to benchmark older architectures before deciding.
                 let dst_masked = (dst as usize) & SIMD_ALIGNMENT_MASK;
+                // Safety: checking whether src is aligned
                 if ((src as usize) & SIMD_ALIGNMENT_MASK) == 0 {
+                    // Safety: Checking whether dst is aligned
                     if dst_masked == 0 {
                         loop {
+                            // Safety: We're valid to read/write SIMD_STRIDE_SIZE elements and have the appropriate alignments
                             if !$stride_both_aligned(src.add(offset), dst.add(offset)) {
                                 break;
                             }
                             offset += SIMD_STRIDE_SIZE;
+                            // Safety: This is `offset > len - SIMD_STRIDE_SIZE` which means we always have at least `SIMD_STRIDE_SIZE` elements to munch next time.
                             if offset > len_minus_stride {
                                 break;
                             }
                         }
                     } else {
                         loop {
+                            // Safety: We're valid to read/write SIMD_STRIDE_SIZE elements and have the appropriate alignments
                             if !$stride_src_aligned(src.add(offset), dst.add(offset)) {
                                 break;
                             }
                             offset += SIMD_STRIDE_SIZE;
+                            // Safety: This is `offset > len - SIMD_STRIDE_SIZE` which means we always have at least `SIMD_STRIDE_SIZE` elements to munch next time.
                             if offset > len_minus_stride {
                                 break;
                             }
                         }
                     }
                 } else {
                     if dst_masked == 0 {
                         loop {
+                            // Safety: We're valid to read/write SIMD_STRIDE_SIZE elements and have the appropriate alignments
                             if !$stride_dst_aligned(src.add(offset), dst.add(offset)) {
                                 break;
                             }
                             offset += SIMD_STRIDE_SIZE;
+                            // Safety: This is `offset > len - SIMD_STRIDE_SIZE` which means we always have at least `SIMD_STRIDE_SIZE` elements to munch next time.
                             if offset > len_minus_stride {
                                 break;
                             }
                         }
                     } else {
                         loop {
+                            // Safety: We're valid to read/write SIMD_STRIDE_SIZE elements and have the appropriate alignments
                             if !$stride_neither_aligned(src.add(offset), dst.add(offset)) {
                                 break;
                             }
                             offset += SIMD_STRIDE_SIZE;
+                            // Safety: This is `offset > len - SIMD_STRIDE_SIZE` which means we always have at least `SIMD_STRIDE_SIZE` elements to munch next time.
                             if offset > len_minus_stride {
                                 break;
                             }
                         }
                     }
                 }
             }
             while offset < len {
+                // Safety: uses len invariant here and below
                 let code_unit = *(src.add(offset));
                 if code_unit > 127 {
+                    // Safety: upholds safety-usable invariant
                     return Some((code_unit, offset));
                 }
                 *(dst.add(offset)) = code_unit as $dst_unit;
                 offset += 1;
             }
             None
         }
     };
 }
 
 #[allow(unused_macros)]
 macro_rules! ascii_simd_check_align_unrolled {
     (
         $name:ident,
         $src_unit:ty,
         $dst_unit:ty,
+        // Safety: This function must require aligned src/dest that are valid for reading/writing SIMD_STRIDE_SIZE src_unit/dst_unit
         $stride_both_aligned:ident,
+        // Safety: This function must require aligned/unaligned src/dest that are valid for reading/writing SIMD_STRIDE_SIZE src_unit/dst_unit
         $stride_src_aligned:ident,
+        // Safety: This function must require unaligned src/dest that are valid for reading/writing SIMD_STRIDE_SIZE src_unit/dst_unit
         $stride_neither_aligned:ident,
+        // Safety: This function must require aligned src/dest that are valid for reading/writing 2*SIMD_STRIDE_SIZE src_unit/dst_unit
         $double_stride_both_aligned:ident,
+        // Safety: This function must require aligned/unaligned src/dest that are valid for reading/writing 2*SIMD_STRIDE_SIZE src_unit/dst_unit
         $double_stride_src_aligned:ident
     ) => {
-        #[inline(always)]
+        /// Safety: src/dst must be valid for reads/writes of `len` elements of their units.
+        ///
+        /// Safety-usable invariant: will return Some() when it encounters non-ASCII, with the first element in the Some being
+        /// guaranteed to be non-ASCII (> 127), and the second being the offset where it is found        #[inline(always)]
         pub unsafe fn $name(
             src: *const $src_unit,
             dst: *mut $dst_unit,
             len: usize,
         ) -> Option<($src_unit, usize)> {
             let unit_size = ::core::mem::size_of::<$src_unit>();
             let mut offset = 0usize;
             // This loop is only broken out of as a goto forward without
             // actually looping
             'outer: loop {
+                // Safety: if this check succeeds we're valid for reading/writing at least `SIMD_STRIDE_SIZE` elements.
                 if SIMD_STRIDE_SIZE <= len {
                     // First, process one unaligned
+                    // Safety: this is safe to call since we're valid for this read/write
                     if !$stride_neither_aligned(src, dst) {
                         break 'outer;
                     }
                     offset = SIMD_STRIDE_SIZE;
 
                     // We have now seen 16 ASCII bytes. Let's guess that
                     // there will be enough more to justify more expense
                     // in the case of non-ASCII.
                     // Use aligned reads for the sake of old microachitectures.
+                    //
+                    // Safety: this correctly calculates the number of src_units that need to be read before the remaining list is aligned.
+                    // This is less that SIMD_ALIGNMENT, which is also SIMD_STRIDE_SIZE (as documented)
                     let until_alignment = ((SIMD_ALIGNMENT
                         - ((src.add(offset) as usize) & SIMD_ALIGNMENT_MASK))
                         & SIMD_ALIGNMENT_MASK)
                         / unit_size;
-                    // This addition won't overflow, because even in the 32-bit PAE case the
+                    // Safety: This addition won't overflow, because even in the 32-bit PAE case the
                     // address space holds enough code that the slice length can't be that
                     // close to address space size.
                     // offset now equals SIMD_STRIDE_SIZE, hence times 3 below.
+                    //
+                    // Safety: if this check succeeds we're valid for reading/writing at least `2 * SIMD_STRIDE_SIZE` elements plus `until_alignment`.
+                    // The extra SIMD_STRIDE_SIZE in the condition is because `offset` is already `SIMD_STRIDE_SIZE`.
                     if until_alignment + (SIMD_STRIDE_SIZE * 3) <= len {
                         if until_alignment != 0 {
+                            // Safety: this is safe to call since we're valid for this read/write (and more), and don't care about alignment
+                            // This will copy over bytes that get decoded twice since it's not incrementing `offset` by SIMD_STRIDE_SIZE. This is fine.
                             if !$stride_neither_aligned(src.add(offset), dst.add(offset)) {
                                 break;
                             }
                             offset += until_alignment;
                         }
+                        // Safety: At this point we're valid for reading/writing 2*SIMD_STRIDE_SIZE elements
+                        // Safety: Now `offset` is aligned for `src`
                         let len_minus_stride_times_two = len - (SIMD_STRIDE_SIZE * 2);
+                        // Safety: This is whether dst is aligned
                         let dst_masked = (dst.add(offset) as usize) & SIMD_ALIGNMENT_MASK;
                         if dst_masked == 0 {
                             loop {
+                                // Safety: both are aligned, we can call the aligned function. We're valid for reading/writing double stride from the initial condition
+                                // and the loop break condition below
                                 if let Some(advance) =
                                     $double_stride_both_aligned(src.add(offset), dst.add(offset))
                                 {
                                     offset += advance;
                                     let code_unit = *(src.add(offset));
+                                    // Safety: uses safety-usable invariant on ascii_to_ascii_simd_double_stride to return
+                                    // guaranteed non-ascii
                                     return Some((code_unit, offset));
                                 }
                                 offset += SIMD_STRIDE_SIZE * 2;
+                                // Safety: This is `offset > len - 2 * SIMD_STRIDE_SIZE` which means we always have at least `2 * SIMD_STRIDE_SIZE` elements to munch next time.
                                 if offset > len_minus_stride_times_two {
                                     break;
                                 }
                             }
+                            // Safety: We're valid for reading/writing one more, and can still assume alignment
                             if offset + SIMD_STRIDE_SIZE <= len {
                                 if !$stride_both_aligned(src.add(offset), dst.add(offset)) {
                                     break 'outer;
                                 }
                                 offset += SIMD_STRIDE_SIZE;
                             }
                         } else {
                             loop {
+                                // Safety: only src is aligned here. We're valid for reading/writing double stride from the initial condition
+                                // and the loop break condition below
                                 if let Some(advance) =
                                     $double_stride_src_aligned(src.add(offset), dst.add(offset))
                                 {
                                     offset += advance;
                                     let code_unit = *(src.add(offset));
+                                    // Safety: uses safety-usable invariant on ascii_to_ascii_simd_double_stride to return
+                                    // guaranteed non-ascii
                                     return Some((code_unit, offset));
                                 }
                                 offset += SIMD_STRIDE_SIZE * 2;
+                                // Safety: This is `offset > len - 2 * SIMD_STRIDE_SIZE` which means we always have at least `2 * SIMD_STRIDE_SIZE` elements to munch next time.
+
                                 if offset > len_minus_stride_times_two {
                                     break;
                                 }
                             }
+                            // Safety: We're valid for reading/writing one more, and can still assume alignment
                             if offset + SIMD_STRIDE_SIZE <= len {
                                 if !$stride_src_aligned(src.add(offset), dst.add(offset)) {
                                     break 'outer;
                                 }
                                 offset += SIMD_STRIDE_SIZE;
                             }
                         }
                     } else {
                         // At most two iterations, so unroll
                         if offset + SIMD_STRIDE_SIZE <= len {
+                            // Safety: The check above ensures we're allowed to read/write this, and we don't use alignment
                             if !$stride_neither_aligned(src.add(offset), dst.add(offset)) {
                                 break;
                             }
                             offset += SIMD_STRIDE_SIZE;
                             if offset + SIMD_STRIDE_SIZE <= len {
+                                // Safety: The check above ensures we're allowed to read/write this, and we don't use alignment
                                 if !$stride_neither_aligned(src.add(offset), dst.add(offset)) {
                                     break;
                                 }
                                 offset += SIMD_STRIDE_SIZE;
                             }
                         }
                     }
                 }
                 break 'outer;
             }
             while offset < len {
+                // Safety: relies straightforwardly on the `len` invariant
                 let code_unit = *(src.add(offset));
                 if code_unit > 127 {
+                    // Safety-usable invariant upheld here
                     return Some((code_unit, offset));
                 }
                 *(dst.add(offset)) = code_unit as $dst_unit;
                 offset += 1;
             }
             None
         }
     };
 }
 
 #[allow(unused_macros)]
 macro_rules! latin1_simd_check_align {
     (
         $name:ident,
         $src_unit:ty,
         $dst_unit:ty,
+        // Safety: This function must require aligned src/dest that are valid for reading/writing SIMD_STRIDE_SIZE src_unit/dst_unit
         $stride_both_aligned:ident,
+        // Safety: This function must require aligned/unaligned src/dest that are valid for reading/writing SIMD_STRIDE_SIZE src_unit/dst_unit
         $stride_src_aligned:ident,
+        // Safety: This function must require unaligned/aligned src/dest that are valid for reading/writing SIMD_STRIDE_SIZE src_unit/dst_unit
         $stride_dst_aligned:ident,
+        // Safety: This function must require unaligned src/dest that are valid for reading/writing SIMD_STRIDE_SIZE src_unit/dst_unit
         $stride_neither_aligned:ident
+
     ) => {
+        /// Safety: src/dst must be valid for reads/writes of `len` elements of their units.
         #[inline(always)]
         pub unsafe fn $name(src: *const $src_unit, dst: *mut $dst_unit, len: usize) {
             let mut offset = 0usize;
+            // Safety: if this check succeeds we're valid for reading/writing at least `SIMD_STRIDE_SIZE` elements.
             if SIMD_STRIDE_SIZE <= len {
                 let len_minus_stride = len - SIMD_STRIDE_SIZE;
+                // Whether dst is aligned
                 let dst_masked = (dst as usize) & SIMD_ALIGNMENT_MASK;
+                // Whether src is aligned
                 if ((src as usize) & SIMD_ALIGNMENT_MASK) == 0 {
                     if dst_masked == 0 {
                         loop {
+                            // Safety: Both were aligned, we can use the aligned function
                             $stride_both_aligned(src.add(offset), dst.add(offset));
                             offset += SIMD_STRIDE_SIZE;
+                            // Safety: This is `offset > len - SIMD_STRIDE_SIZE`, which means in the next iteration we're valid for
+                            // reading/writing at least SIMD_STRIDE_SIZE elements.
                             if offset > len_minus_stride {
                                 break;
                             }
                         }
                     } else {
                         loop {
+                            // Safety: src was aligned, dst was not
                             $stride_src_aligned(src.add(offset), dst.add(offset));
                             offset += SIMD_STRIDE_SIZE;
+                            // Safety: This is `offset > len - SIMD_STRIDE_SIZE`, which means in the next iteration we're valid for
+                            // reading/writing at least SIMD_STRIDE_SIZE elements.
                             if offset > len_minus_stride {
                                 break;
                             }
                         }
                     }
                 } else {
                     if dst_masked == 0 {
                         loop {
+                            // Safety: src was aligned, dst was not
                             $stride_dst_aligned(src.add(offset), dst.add(offset));
                             offset += SIMD_STRIDE_SIZE;
+                            // Safety: This is `offset > len - SIMD_STRIDE_SIZE`, which means in the next iteration we're valid for
+                            // reading/writing at least SIMD_STRIDE_SIZE elements.
                             if offset > len_minus_stride {
                                 break;
                             }
                         }
                     } else {
                         loop {
+                            // Safety: Neither were aligned
                             $stride_neither_aligned(src.add(offset), dst.add(offset));
                             offset += SIMD_STRIDE_SIZE;
+                            // Safety: This is `offset > len - SIMD_STRIDE_SIZE`, which means in the next iteration we're valid for
+                            // reading/writing at least SIMD_STRIDE_SIZE elements.
                             if offset > len_minus_stride {
                                 break;
                             }
                         }
                     }
                 }
             }
             while offset < len {
+                // Safety: relies straightforwardly on the `len` invariant
                 let code_unit = *(src.add(offset));
                 *(dst.add(offset)) = code_unit as $dst_unit;
                 offset += 1;
             }
         }
     };
 }
 
 #[allow(unused_macros)]
 macro_rules! latin1_simd_check_align_unrolled {
     (
         $name:ident,
         $src_unit:ty,
         $dst_unit:ty,
+        // Safety: This function must require aligned src/dest that are valid for reading/writing SIMD_STRIDE_SIZE src_unit/dst_unit
         $stride_both_aligned:ident,
+        // Safety: This function must require aligned/unaligned src/dest that are valid for reading/writing SIMD_STRIDE_SIZE src_unit/dst_unit
         $stride_src_aligned:ident,
+        // Safety: This function must require unaligned/aligned src/dest that are valid for reading/writing SIMD_STRIDE_SIZE src_unit/dst_unit
         $stride_dst_aligned:ident,
+        // Safety: This function must require unaligned src/dest that are valid for reading/writing SIMD_STRIDE_SIZE src_unit/dst_unit
         $stride_neither_aligned:ident
     ) => {
+        /// Safety: src/dst must be valid for reads/writes of `len` elements of their units.
         #[inline(always)]
         pub unsafe fn $name(src: *const $src_unit, dst: *mut $dst_unit, len: usize) {
             let unit_size = ::core::mem::size_of::<$src_unit>();
             let mut offset = 0usize;
+            // Safety: if this check succeeds we're valid for reading/writing at least `SIMD_STRIDE_SIZE` elements.
             if SIMD_STRIDE_SIZE <= len {
+                // Safety: this correctly calculates the number of src_units that need to be read before the remaining list is aligned.
+                // This is by definition less than SIMD_STRIDE_SIZE.
                 let mut until_alignment = ((SIMD_STRIDE_SIZE
                     - ((src as usize) & SIMD_ALIGNMENT_MASK))
                     & SIMD_ALIGNMENT_MASK)
                     / unit_size;
                 while until_alignment != 0 {
+                    // Safety: This is a straightforward copy, since until_alignment is < SIMD_STRIDE_SIZE < len, this is in-bounds
                     *(dst.add(offset)) = *(src.add(offset)) as $dst_unit;
                     offset += 1;
                     until_alignment -= 1;
                 }
+                // Safety: here offset will be `until_alignment`, i.e. enough to align `src`.
                 let len_minus_stride = len - SIMD_STRIDE_SIZE;
+                // Safety: if this check succeeds we're valid for reading/writing at least `2 * SIMD_STRIDE_SIZE` elements.
                 if offset + SIMD_STRIDE_SIZE * 2 <= len {
                     let len_minus_stride_times_two = len_minus_stride - SIMD_STRIDE_SIZE;
+                    // Safety: at this point src is known to be aligned at offset, dst is not.
                     if (dst.add(offset) as usize) & SIMD_ALIGNMENT_MASK == 0 {
                         loop {
+                            // Safety: We checked alignment of dst above, we can use the alignment functions. We're allowed to read/write 2*SIMD_STRIDE_SIZE elements, which we do.
                             $stride_both_aligned(src.add(offset), dst.add(offset));
                             offset += SIMD_STRIDE_SIZE;
                             $stride_both_aligned(src.add(offset), dst.add(offset));
                             offset += SIMD_STRIDE_SIZE;
+                            // Safety: This is `offset > len - 2 * SIMD_STRIDE_SIZE` which means we always have at least `2 * SIMD_STRIDE_SIZE` elements to munch next time.
                             if offset > len_minus_stride_times_two {
                                 break;
                             }
                         }
                     } else {
                         loop {
+                            // Safety: we ensured alignment of src already.
                             $stride_src_aligned(src.add(offset), dst.add(offset));
                             offset += SIMD_STRIDE_SIZE;
                             $stride_src_aligned(src.add(offset), dst.add(offset));
                             offset += SIMD_STRIDE_SIZE;
+                            // Safety: This is `offset > len - 2 * SIMD_STRIDE_SIZE` which means we always have at least `2 * SIMD_STRIDE_SIZE` elements to munch next time.
                             if offset > len_minus_stride_times_two {
                                 break;
                             }
                         }
                     }
                 }
+                // Safety: This is `offset > len - SIMD_STRIDE_SIZE` which means we are valid to munch SIMD_STRIDE_SIZE more elements, which we do
                 if offset < len_minus_stride {
                     $stride_src_aligned(src.add(offset), dst.add(offset));
                     offset += SIMD_STRIDE_SIZE;
                 }
             }
             while offset < len {
+                // Safety: uses len invariant here and below
                 let code_unit = *(src.add(offset));
                 // On x86_64, this loop autovectorizes but in the pack
                 // case there are instructions whose purpose is to make sure
                 // each u16 in the vector is truncated before packing. However,
                 // since we don't care about saturating behavior of SSE2 packing
                 // when the input isn't Latin1, those instructions are useless.
                 // Unfortunately, using the `assume` intrinsic to lie to the
                 // optimizer doesn't make LLVM omit the trunctation that we
@@ -688,138 +869,180 @@ macro_rules! latin1_simd_check_align_unr
                 offset += 1;
             }
         }
     };
 }
 
 #[allow(unused_macros)]
 macro_rules! ascii_simd_unalign {
+    // Safety: stride_neither_aligned must be a function that requires src/dest be valid for unaligned reads/writes for SIMD_STRIDE_SIZE elements of type src_unit/dest_unit
     ($name:ident, $src_unit:ty, $dst_unit:ty, $stride_neither_aligned:ident) => {
+        /// Safety: src and dst must be valid for reads/writes of len elements of type src_unit/dst_unit
+        ///
+        /// Safety-usable invariant: will return Some() when it encounters non-ASCII, with the first element in the Some being
+        /// guaranteed to be non-ASCII (> 127), and the second being the offset where it is found
         #[inline(always)]
         pub unsafe fn $name(
             src: *const $src_unit,
             dst: *mut $dst_unit,
             len: usize,
         ) -> Option<($src_unit, usize)> {
             let mut offset = 0usize;
+            // Safety: if this check succeeds we're valid for reading/writing at least `stride` elements.
             if SIMD_STRIDE_SIZE <= len {
                 let len_minus_stride = len - SIMD_STRIDE_SIZE;
                 loop {
+                    // Safety: We know we're valid for `stride` reads/writes, so we can call this function. We don't need alignment.
                     if !$stride_neither_aligned(src.add(offset), dst.add(offset)) {
                         break;
                     }
                     offset += SIMD_STRIDE_SIZE;
+                    // This is `offset > len - stride` which means we always have at least `stride` elements to munch next time.
                     if offset > len_minus_stride {
                         break;
                     }
                 }
             }
             while offset < len {
+                // Safety: Uses len invariant here and below
                 let code_unit = *(src.add(offset));
                 if code_unit > 127 {
+                    // Safety-usable invariant upheld here
                     return Some((code_unit, offset));
                 }
                 *(dst.add(offset)) = code_unit as $dst_unit;
                 offset += 1;
             }
             None
         }
     };
 }
 
 #[allow(unused_macros)]
 macro_rules! latin1_simd_unalign {
+    // Safety: stride_neither_aligned must be a function that requires src/dest be valid for unaligned reads/writes for SIMD_STRIDE_SIZE elements of type src_unit/dest_unit
     ($name:ident, $src_unit:ty, $dst_unit:ty, $stride_neither_aligned:ident) => {
+        /// Safety: src and dst must be valid for unaligned reads/writes of len elements of type src_unit/dst_unit
         #[inline(always)]
         pub unsafe fn $name(src: *const $src_unit, dst: *mut $dst_unit, len: usize) {
             let mut offset = 0usize;
+            // Safety: if this check succeeds we're valid for reading/writing at least `stride` elements.
             if SIMD_STRIDE_SIZE <= len {
                 let len_minus_stride = len - SIMD_STRIDE_SIZE;
                 loop {
+                    // Safety: We know we're valid for `stride` reads/writes, so we can call this function. We don't need alignment.
                     $stride_neither_aligned(src.add(offset), dst.add(offset));
                     offset += SIMD_STRIDE_SIZE;
+                    // This is `offset > len - stride` which means we always have at least `stride` elements to munch next time.
                     if offset > len_minus_stride {
                         break;
                     }
                 }
             }
             while offset < len {
+                // Safety: Uses len invariant here
                 let code_unit = *(src.add(offset));
                 *(dst.add(offset)) = code_unit as $dst_unit;
                 offset += 1;
             }
         }
     };
 }
 
 #[allow(unused_macros)]
 macro_rules! ascii_to_ascii_simd_stride {
+    // Safety: load/store must be valid for 16 bytes of read/write, which may be unaligned. (candidates: `(load|store)(16|8)_(unaligned|aligned)` functions)
     ($name:ident, $load:ident, $store:ident) => {
+        /// Safety: src and dst must be valid for 16 bytes of read/write according to
+        /// the $load/$store fn, which may allow for unaligned reads/writes or require
+        /// alignment to either 16x8 or u8x16.
         #[inline(always)]
         pub unsafe fn $name(src: *const u8, dst: *mut u8) -> bool {
             let simd = $load(src);
             if !simd_is_ascii(simd) {
                 return false;
             }
             $store(dst, simd);
             true
         }
     };
 }
 
 #[allow(unused_macros)]
 macro_rules! ascii_to_ascii_simd_double_stride {
+    // Safety: store must be valid for 32 bytes of write, which may be unaligned (candidates: `store(8|16)_(aligned|unaligned)`)
     ($name:ident, $store:ident) => {
+        /// Safety: src must be valid for 32 bytes of aligned u8x16 read
+        /// dst must be valid for 32 bytes of unaligned write according to
+        /// the $store fn, which may allow for unaligned writes or require
+        /// alignment to either 16x8 or u8x16.
+        ///
+        /// Safety-usable invariant: Returns Some(index) if the element at `index` is invalid ASCII
         #[inline(always)]
         pub unsafe fn $name(src: *const u8, dst: *mut u8) -> Option<usize> {
             let first = load16_aligned(src);
             let second = load16_aligned(src.add(SIMD_STRIDE_SIZE));
             $store(dst, first);
             if unlikely(!simd_is_ascii(first | second)) {
+                // Safety: mask_ascii produces a mask of all the high bits.
                 let mask_first = mask_ascii(first);
                 if mask_first != 0 {
+                    // Safety: on little endian systems this will be the number of ascii bytes
+                    // before the first non-ascii, i.e. valid for indexing src
+                    // TODO SAFETY: What about big-endian systems?
                     return Some(mask_first.trailing_zeros() as usize);
                 }
                 $store(dst.add(SIMD_STRIDE_SIZE), second);
                 let mask_second = mask_ascii(second);
+                // Safety: on little endian systems this will be the number of ascii bytes
+                // before the first non-ascii, i.e. valid for indexing src
                 return Some(SIMD_STRIDE_SIZE + mask_second.trailing_zeros() as usize);
             }
             $store(dst.add(SIMD_STRIDE_SIZE), second);
             None
         }
     };
 }
 
 #[allow(unused_macros)]
 macro_rules! ascii_to_basic_latin_simd_stride {
+    // Safety: load/store must be valid for 16 bytes of read/write, which may be unaligned. (candidates: `(load|store)(16|8)_(unaligned|aligned)` functions)
     ($name:ident, $load:ident, $store:ident) => {
+        /// Safety: src and dst must be valid for 16/32 bytes of read/write according to
+        /// the $load/$store fn, which may allow for unaligned reads/writes or require
+        /// alignment to either 16x8 or u8x16.
         #[inline(always)]
         pub unsafe fn $name(src: *const u8, dst: *mut u16) -> bool {
             let simd = $load(src);
             if !simd_is_ascii(simd) {
                 return false;
             }
             let (first, second) = simd_unpack(simd);
             $store(dst, first);
             $store(dst.add(8), second);
             true
         }
     };
 }
 
 #[allow(unused_macros)]
 macro_rules! ascii_to_basic_latin_simd_double_stride {
+    // Safety: store must be valid for 16 bytes of write, which may be unaligned
     ($name:ident, $store:ident) => {
+        /// Safety: src must be valid for 2*SIMD_STRIDE_SIZE bytes of aligned reads,
+        /// aligned to either 16x8 or u8x16.
+        /// dst must be valid for 2*SIMD_STRIDE_SIZE bytes of aligned or unaligned reads
         #[inline(always)]
         pub unsafe fn $name(src: *const u8, dst: *mut u16) -> Option<usize> {
             let first = load16_aligned(src);
             let second = load16_aligned(src.add(SIMD_STRIDE_SIZE));
             let (a, b) = simd_unpack(first);
             $store(dst, a);
+            // Safety: divide by 2 since it's a u16 pointer
             $store(dst.add(SIMD_STRIDE_SIZE / 2), b);
             if unlikely(!simd_is_ascii(first | second)) {
                 let mask_first = mask_ascii(first);
                 if mask_first != 0 {
                     return Some(mask_first.trailing_zeros() as usize);
                 }
                 let (c, d) = simd_unpack(second);
                 $store(dst.add(SIMD_STRIDE_SIZE), c);
@@ -832,47 +1055,59 @@ macro_rules! ascii_to_basic_latin_simd_d
             $store(dst.add(SIMD_STRIDE_SIZE + (SIMD_STRIDE_SIZE / 2)), d);
             None
         }
     };
 }
 
 #[allow(unused_macros)]
 macro_rules! unpack_simd_stride {
+    // Safety: load/store must be valid for 16 bytes of read/write, which may be unaligned. (candidates: `(load|store)(16|8)_(unaligned|aligned)` functions)
     ($name:ident, $load:ident, $store:ident) => {
+        /// Safety: src and dst must be valid for 16 bytes of read/write according to
+        /// the $load/$store fn, which may allow for unaligned reads/writes or require
+        /// alignment to either 16x8 or u8x16.
         #[inline(always)]
         pub unsafe fn $name(src: *const u8, dst: *mut u16) {
             let simd = $load(src);
             let (first, second) = simd_unpack(simd);
             $store(dst, first);
             $store(dst.add(8), second);
         }
     };
 }
 
 #[allow(unused_macros)]
 macro_rules! basic_latin_to_ascii_simd_stride {
+    // Safety: load/store must be valid for 16 bytes of read/write, which may be unaligned. (candidates: `(load|store)(16|8)_(unaligned|aligned)` functions)
     ($name:ident, $load:ident, $store:ident) => {
+        /// Safety: src and dst must be valid for 32/16 bytes of read/write according to
+        /// the $load/$store fn, which may allow for unaligned reads/writes or require
+        /// alignment to either 16x8 or u8x16.
         #[inline(always)]
         pub unsafe fn $name(src: *const u16, dst: *mut u8) -> bool {
             let first = $load(src);
             let second = $load(src.add(8));
             if simd_is_basic_latin(first | second) {
                 $store(dst, simd_pack(first, second));
                 true
             } else {
                 false
             }
         }
     };
 }
 
 #[allow(unused_macros)]
 macro_rules! pack_simd_stride {
+    // Safety: load/store must be valid for 16 bytes of read/write, which may be unaligned. (candidates: `(load|store)(16|8)_(unaligned|aligned)` functions)
     ($name:ident, $load:ident, $store:ident) => {
+        /// Safety: src and dst must be valid for 32/16 bytes of read/write according to
+        /// the $load/$store fn, which may allow for unaligned reads/writes or require
+        /// alignment to either 16x8 or u8x16.
         #[inline(always)]
         pub unsafe fn $name(src: *const u16, dst: *mut u8) {
             let first = $load(src);
             let second = $load(src.add(8));
             $store(dst, simd_pack(first, second));
         }
     };
 }
@@ -888,24 +1123,28 @@ cfg_if! {
 //        pub const ALIGNMENT: usize = 8;
 
         pub const ALU_STRIDE_SIZE: usize = 16;
 
         pub const ALU_ALIGNMENT: usize = 8;
 
         pub const ALU_ALIGNMENT_MASK: usize = 7;
 
+        // Safety for stride macros: We stick to the load8_aligned/etc family of functions. We consistently produce
+        // neither_unaligned variants using only unaligned inputs.
         ascii_to_ascii_simd_stride!(ascii_to_ascii_stride_neither_aligned, load16_unaligned, store16_unaligned);
 
         ascii_to_basic_latin_simd_stride!(ascii_to_basic_latin_stride_neither_aligned, load16_unaligned, store8_unaligned);
         unpack_simd_stride!(unpack_stride_neither_aligned, load16_unaligned, store8_unaligned);
 
         basic_latin_to_ascii_simd_stride!(basic_latin_to_ascii_stride_neither_aligned, load8_unaligned, store16_unaligned);
         pack_simd_stride!(pack_stride_neither_aligned, load8_unaligned, store16_unaligned);
 
+        // Safety for conversion macros: We use the unalign macro with unalign functions above. All stride functions were produced
+        // by stride macros that universally munch a single SIMD_STRIDE_SIZE worth of elements.
         ascii_simd_unalign!(ascii_to_ascii, u8, u8, ascii_to_ascii_stride_neither_aligned);
         ascii_simd_unalign!(ascii_to_basic_latin, u8, u16, ascii_to_basic_latin_stride_neither_aligned);
         ascii_simd_unalign!(basic_latin_to_ascii, u16, u8, basic_latin_to_ascii_stride_neither_aligned);
         latin1_simd_unalign!(unpack_latin1, u8, u16, unpack_stride_neither_aligned);
         latin1_simd_unalign!(pack_latin1, u16, u8, pack_stride_neither_aligned);
     } else if #[cfg(all(feature = "simd-accel", target_endian = "little", target_feature = "neon"))] {
         // SIMD with different instructions for aligned and unaligned loads and stores.
         //
@@ -914,16 +1153,19 @@ cfg_if! {
         // but the benchmark results I see don't agree.
 
         pub const SIMD_STRIDE_SIZE: usize = 16;
 
         pub const MAX_STRIDE_SIZE: usize = 16;
 
         pub const SIMD_ALIGNMENT_MASK: usize = 15;
 
+        // Safety for stride macros: We stick to the load8_aligned/etc family of functions. We consistently name
+        // aligned/unaligned functions according to src/dst being aligned/unaligned
+
         ascii_to_ascii_simd_stride!(ascii_to_ascii_stride_both_aligned, load16_aligned, store16_aligned);
         ascii_to_ascii_simd_stride!(ascii_to_ascii_stride_src_aligned, load16_aligned, store16_unaligned);
         ascii_to_ascii_simd_stride!(ascii_to_ascii_stride_dst_aligned, load16_unaligned, store16_aligned);
         ascii_to_ascii_simd_stride!(ascii_to_ascii_stride_neither_aligned, load16_unaligned, store16_unaligned);
 
         ascii_to_basic_latin_simd_stride!(ascii_to_basic_latin_stride_both_aligned, load16_aligned, store8_aligned);
         ascii_to_basic_latin_simd_stride!(ascii_to_basic_latin_stride_src_aligned, load16_aligned, store8_unaligned);
         ascii_to_basic_latin_simd_stride!(ascii_to_basic_latin_stride_dst_aligned, load16_unaligned, store8_aligned);
@@ -939,36 +1181,43 @@ cfg_if! {
         basic_latin_to_ascii_simd_stride!(basic_latin_to_ascii_stride_dst_aligned, load8_unaligned, store16_aligned);
         basic_latin_to_ascii_simd_stride!(basic_latin_to_ascii_stride_neither_aligned, load8_unaligned, store16_unaligned);
 
         pack_simd_stride!(pack_stride_both_aligned, load8_aligned, store16_aligned);
         pack_simd_stride!(pack_stride_src_aligned, load8_aligned, store16_unaligned);
         pack_simd_stride!(pack_stride_dst_aligned, load8_unaligned, store16_aligned);
         pack_simd_stride!(pack_stride_neither_aligned, load8_unaligned, store16_unaligned);
 
+        // Safety for conversion macros: We use the correct pattern of both/src/dst/neither here. All stride functions were produced
+        // by stride macros that universally munch a single SIMD_STRIDE_SIZE worth of elements.
+
         ascii_simd_check_align!(ascii_to_ascii, u8, u8, ascii_to_ascii_stride_both_aligned, ascii_to_ascii_stride_src_aligned, ascii_to_ascii_stride_dst_aligned, ascii_to_ascii_stride_neither_aligned);
         ascii_simd_check_align!(ascii_to_basic_latin, u8, u16, ascii_to_basic_latin_stride_both_aligned, ascii_to_basic_latin_stride_src_aligned, ascii_to_basic_latin_stride_dst_aligned, ascii_to_basic_latin_stride_neither_aligned);
         ascii_simd_check_align!(basic_latin_to_ascii, u16, u8, basic_latin_to_ascii_stride_both_aligned, basic_latin_to_ascii_stride_src_aligned, basic_latin_to_ascii_stride_dst_aligned, basic_latin_to_ascii_stride_neither_aligned);
         latin1_simd_check_align!(unpack_latin1, u8, u16, unpack_stride_both_aligned, unpack_stride_src_aligned, unpack_stride_dst_aligned, unpack_stride_neither_aligned);
         latin1_simd_check_align!(pack_latin1, u16, u8, pack_stride_both_aligned, pack_stride_src_aligned, pack_stride_dst_aligned, pack_stride_neither_aligned);
     } else if #[cfg(all(feature = "simd-accel", target_feature = "sse2"))] {
         // SIMD with different instructions for aligned and unaligned loads and stores.
         //
         // Newer microarchitectures are not supposed to have a performance difference between
         // aligned and unaligned SSE2 loads and stores when the address is actually aligned,
         // but the benchmark results I see don't agree.
 
         pub const SIMD_STRIDE_SIZE: usize = 16;
 
+        /// Safety-usable invariant: This should be identical to SIMD_STRIDE_SIZE (used by ascii_simd_check_align_unrolled)
         pub const SIMD_ALIGNMENT: usize = 16;
 
         pub const MAX_STRIDE_SIZE: usize = 16;
 
         pub const SIMD_ALIGNMENT_MASK: usize = 15;
 
+        // Safety for stride macros: We stick to the load8_aligned/etc family of functions. We consistently name
+        // aligned/unaligned functions according to src/dst being aligned/unaligned
+
         ascii_to_ascii_simd_double_stride!(ascii_to_ascii_simd_double_stride_both_aligned, store16_aligned);
         ascii_to_ascii_simd_double_stride!(ascii_to_ascii_simd_double_stride_src_aligned, store16_unaligned);
 
         ascii_to_basic_latin_simd_double_stride!(ascii_to_basic_latin_simd_double_stride_both_aligned, store8_aligned);
         ascii_to_basic_latin_simd_double_stride!(ascii_to_basic_latin_simd_double_stride_src_aligned, store8_unaligned);
 
         ascii_to_ascii_simd_stride!(ascii_to_ascii_stride_both_aligned, load16_aligned, store16_aligned);
         ascii_to_ascii_simd_stride!(ascii_to_ascii_stride_src_aligned, load16_aligned, store16_unaligned);
@@ -984,33 +1233,43 @@ cfg_if! {
         basic_latin_to_ascii_simd_stride!(basic_latin_to_ascii_stride_both_aligned, load8_aligned, store16_aligned);
         basic_latin_to_ascii_simd_stride!(basic_latin_to_ascii_stride_src_aligned, load8_aligned, store16_unaligned);
         basic_latin_to_ascii_simd_stride!(basic_latin_to_ascii_stride_dst_aligned, load8_unaligned, store16_aligned);
         basic_latin_to_ascii_simd_stride!(basic_latin_to_ascii_stride_neither_aligned, load8_unaligned, store16_unaligned);
 
         pack_simd_stride!(pack_stride_both_aligned, load8_aligned, store16_aligned);
         pack_simd_stride!(pack_stride_src_aligned, load8_aligned, store16_unaligned);
 
+        // Safety for conversion macros: We use the correct pattern of both/src/dst/neither/double_both/double_src here. All stride functions were produced
+        // by stride macros that universally munch a single SIMD_STRIDE_SIZE worth of elements.
+
         ascii_simd_check_align_unrolled!(ascii_to_ascii, u8, u8, ascii_to_ascii_stride_both_aligned, ascii_to_ascii_stride_src_aligned, ascii_to_ascii_stride_neither_aligned, ascii_to_ascii_simd_double_stride_both_aligned, ascii_to_ascii_simd_double_stride_src_aligned);
         ascii_simd_check_align_unrolled!(ascii_to_basic_latin, u8, u16, ascii_to_basic_latin_stride_both_aligned, ascii_to_basic_latin_stride_src_aligned, ascii_to_basic_latin_stride_neither_aligned, ascii_to_basic_latin_simd_double_stride_both_aligned, ascii_to_basic_latin_simd_double_stride_src_aligned);
 
         ascii_simd_check_align!(basic_latin_to_ascii, u16, u8, basic_latin_to_ascii_stride_both_aligned, basic_latin_to_ascii_stride_src_aligned, basic_latin_to_ascii_stride_dst_aligned, basic_latin_to_ascii_stride_neither_aligned);
         latin1_simd_check_align_unrolled!(unpack_latin1, u8, u16, unpack_stride_both_aligned, unpack_stride_src_aligned, unpack_stride_dst_aligned, unpack_stride_neither_aligned);
         latin1_simd_check_align_unrolled!(pack_latin1, u16, u8, pack_stride_both_aligned, pack_stride_src_aligned, pack_stride_dst_aligned, pack_stride_neither_aligned);
     } else if #[cfg(all(target_endian = "little", target_pointer_width = "64"))] {
         // Aligned ALU word, little-endian, 64-bit
 
+        /// Safety invariant: this is the amount of bytes consumed by
+        /// unpack_alu. This will be twice the pointer width, as it consumes two usizes.
+        /// This is also the number of bytes produced by pack_alu.
+        /// This is also the number of u16 code units produced/consumed by unpack_alu/pack_alu respectively.
         pub const ALU_STRIDE_SIZE: usize = 16;
 
         pub const MAX_STRIDE_SIZE: usize = 16;
 
+        // Safety invariant: this is the pointer width in bytes
         pub const ALU_ALIGNMENT: usize = 8;
 
+        // Safety invariant: this is a mask for getting the bits of a pointer not aligned to ALU_ALIGNMENT
         pub const ALU_ALIGNMENT_MASK: usize = 7;
 
+        /// Safety: dst must point to valid space for writing four `usize`s
         #[inline(always)]
         unsafe fn unpack_alu(word: usize, second_word: usize, dst: *mut usize) {
             let first = ((0x0000_0000_FF00_0000usize & word) << 24) |
                         ((0x0000_0000_00FF_0000usize & word) << 16) |
                         ((0x0000_0000_0000_FF00usize & word) << 8) |
                         (0x0000_0000_0000_00FFusize & word);
             let second = ((0xFF00_0000_0000_0000usize & word) >> 8) |
                          ((0x00FF_0000_0000_0000usize & word) >> 16) |
@@ -1019,22 +1278,24 @@ cfg_if! {
             let third = ((0x0000_0000_FF00_0000usize & second_word) << 24) |
                         ((0x0000_0000_00FF_0000usize & second_word) << 16) |
                         ((0x0000_0000_0000_FF00usize & second_word) << 8) |
                         (0x0000_0000_0000_00FFusize & second_word);
             let fourth = ((0xFF00_0000_0000_0000usize & second_word) >> 8) |
                          ((0x00FF_0000_0000_0000usize & second_word) >> 16) |
                          ((0x0000_FF00_0000_0000usize & second_word) >> 24) |
                          ((0x0000_00FF_0000_0000usize & second_word) >> 32);
+            // Safety: fn invariant used here
             *dst = first;
             *(dst.add(1)) = second;
             *(dst.add(2)) = third;
             *(dst.add(3)) = fourth;
         }
 
+        /// Safety: dst must point to valid space for writing two `usize`s
         #[inline(always)]
         unsafe fn pack_alu(first: usize, second: usize, third: usize, fourth: usize, dst: *mut usize) {
             let word = ((0x00FF_0000_0000_0000usize & second) << 8) |
                        ((0x0000_00FF_0000_0000usize & second) << 16) |
                        ((0x0000_0000_00FF_0000usize & second) << 24) |
                        ((0x0000_0000_0000_00FFusize & second) << 32) |
                        ((0x00FF_0000_0000_0000usize & first) >> 24) |
                        ((0x0000_00FF_0000_0000usize & first) >> 16) |
@@ -1043,70 +1304,88 @@ cfg_if! {
             let second_word = ((0x00FF_0000_0000_0000usize & fourth) << 8) |
                               ((0x0000_00FF_0000_0000usize & fourth) << 16) |
                               ((0x0000_0000_00FF_0000usize & fourth) << 24) |
                               ((0x0000_0000_0000_00FFusize & fourth) << 32) |
                               ((0x00FF_0000_0000_0000usize & third) >> 24) |
                               ((0x0000_00FF_0000_0000usize & third) >> 16) |
                               ((0x0000_0000_00FF_0000usize & third) >> 8) |
                               (0x0000_0000_0000_00FFusize & third);
+            // Safety: fn invariant used here
             *dst = word;
             *(dst.add(1)) = second_word;
         }
     } else if #[cfg(all(target_endian = "little", target_pointer_width = "32"))] {
         // Aligned ALU word, little-endian, 32-bit
 
+        /// Safety invariant: this is the amount of bytes consumed by
+        /// unpack_alu. This will be twice the pointer width, as it consumes two usizes.
+        /// This is also the number of bytes produced by pack_alu.
+        /// This is also the number of u16 code units produced/consumed by unpack_alu/pack_alu respectively.
         pub const ALU_STRIDE_SIZE: usize = 8;
 
         pub const MAX_STRIDE_SIZE: usize = 8;
 
+        // Safety invariant: this is the pointer width in bytes
         pub const ALU_ALIGNMENT: usize = 4;
 
+        // Safety invariant: this is a mask for getting the bits of a pointer not aligned to ALU_ALIGNMENT
         pub const ALU_ALIGNMENT_MASK: usize = 3;
 
+        /// Safety: dst must point to valid space for writing four `usize`s
         #[inline(always)]
         unsafe fn unpack_alu(word: usize, second_word: usize, dst: *mut usize) {
             let first = ((0x0000_FF00usize & word) << 8) |
                         (0x0000_00FFusize & word);
             let second = ((0xFF00_0000usize & word) >> 8) |
                          ((0x00FF_0000usize & word) >> 16);
             let third = ((0x0000_FF00usize & second_word) << 8) |
                         (0x0000_00FFusize & second_word);
             let fourth = ((0xFF00_0000usize & second_word) >> 8) |
                          ((0x00FF_0000usize & second_word) >> 16);
+            // Safety: fn invariant used here
             *dst = first;
             *(dst.add(1)) = second;
             *(dst.add(2)) = third;
             *(dst.add(3)) = fourth;
         }
 
+        /// Safety: dst must point to valid space for writing two `usize`s
         #[inline(always)]
         unsafe fn pack_alu(first: usize, second: usize, third: usize, fourth: usize, dst: *mut usize) {
             let word = ((0x00FF_0000usize & second) << 8) |
                        ((0x0000_00FFusize & second) << 16) |
                        ((0x00FF_0000usize & first) >> 8) |
                        (0x0000_00FFusize & first);
             let second_word = ((0x00FF_0000usize & fourth) << 8) |
                               ((0x0000_00FFusize & fourth) << 16) |
                               ((0x00FF_0000usize & third) >> 8) |
                               (0x0000_00FFusize & third);
+            // Safety: fn invariant used here
             *dst = word;
             *(dst.add(1)) = second_word;
         }
     } else if #[cfg(all(target_endian = "big", target_pointer_width = "64"))] {
         // Aligned ALU word, big-endian, 64-bit
 
+        /// Safety invariant: this is the amount of bytes consumed by
+        /// unpack_alu. This will be twice the pointer width, as it consumes two usizes.
+        /// This is also the number of bytes produced by pack_alu.
+        /// This is also the number of u16 code units produced/consumed by unpack_alu/pack_alu respectively.
         pub const ALU_STRIDE_SIZE: usize = 16;
 
         pub const MAX_STRIDE_SIZE: usize = 16;
 
+        // Safety invariant: this is the pointer width in bytes
         pub const ALU_ALIGNMENT: usize = 8;
 
+        // Safety invariant: this is a mask for getting the bits of a pointer not aligned to ALU_ALIGNMENT
         pub const ALU_ALIGNMENT_MASK: usize = 7;
 
+        /// Safety: dst must point to valid space for writing four `usize`s
         #[inline(always)]
         unsafe fn unpack_alu(word: usize, second_word: usize, dst: *mut usize) {
             let first = ((0xFF00_0000_0000_0000usize & word) >> 8) |
                          ((0x00FF_0000_0000_0000usize & word) >> 16) |
                          ((0x0000_FF00_0000_0000usize & word) >> 24) |
                          ((0x0000_00FF_0000_0000usize & word) >> 32);
             let second = ((0x0000_0000_FF00_0000usize & word) << 24) |
                         ((0x0000_0000_00FF_0000usize & word) << 16) |
@@ -1115,22 +1394,24 @@ cfg_if! {
             let third = ((0xFF00_0000_0000_0000usize & second_word) >> 8) |
                          ((0x00FF_0000_0000_0000usize & second_word) >> 16) |
                          ((0x0000_FF00_0000_0000usize & second_word) >> 24) |
                          ((0x0000_00FF_0000_0000usize & second_word) >> 32);
             let fourth = ((0x0000_0000_FF00_0000usize & second_word) << 24) |
                         ((0x0000_0000_00FF_0000usize & second_word) << 16) |
                         ((0x0000_0000_0000_FF00usize & second_word) << 8) |
                         (0x0000_0000_0000_00FFusize & second_word);
+            // Safety: fn invariant used here
             *dst = first;
             *(dst.add(1)) = second;
             *(dst.add(2)) = third;
             *(dst.add(3)) = fourth;
         }
 
+        /// Safety: dst must point to valid space for writing two `usize`s
         #[inline(always)]
         unsafe fn pack_alu(first: usize, second: usize, third: usize, fourth: usize, dst: *mut usize) {
             let word = ((0x00FF0000_00000000usize & first) << 8) |
                        ((0x000000FF_00000000usize & first) << 16) |
                        ((0x00000000_00FF0000usize & first) << 24) |
                        ((0x00000000_000000FFusize & first) << 32) |
                        ((0x00FF0000_00000000usize & second) >> 24) |
                        ((0x000000FF_00000000usize & second) >> 16) |
@@ -1139,67 +1420,80 @@ cfg_if! {
             let second_word = ((0x00FF0000_00000000usize & third) << 8) |
                               ((0x000000FF_00000000usize & third) << 16) |
                               ((0x00000000_00FF0000usize & third) << 24) |
                               ((0x00000000_000000FFusize & third) << 32) |
                               ((0x00FF0000_00000000usize & fourth) >> 24) |
                               ((0x000000FF_00000000usize & fourth) >> 16) |
                               ((0x00000000_00FF0000usize & fourth) >> 8) |
                               (0x00000000_000000FFusize &  fourth);
+            // Safety: fn invariant used here
             *dst = word;
             *(dst.add(1)) = second_word;
         }
     } else if #[cfg(all(target_endian = "big", target_pointer_width = "32"))] {
         // Aligned ALU word, big-endian, 32-bit
 
+        /// Safety invariant: this is the amount of bytes consumed by
+        /// unpack_alu. This will be twice the pointer width, as it consumes two usizes.
+        /// This is also the number of bytes produced by pack_alu.
+        /// This is also the number of u16 code units produced/consumed by unpack_alu/pack_alu respectively.
         pub const ALU_STRIDE_SIZE: usize = 8;
 
         pub const MAX_STRIDE_SIZE: usize = 8;
 
+        // Safety invariant: this is the pointer width in bytes
         pub const ALU_ALIGNMENT: usize = 4;
 
+        // Safety invariant: this is a mask for getting the bits of a pointer not aligned to ALU_ALIGNMENT
         pub const ALU_ALIGNMENT_MASK: usize = 3;
 
+        /// Safety: dst must point to valid space for writing four `usize`s
         #[inline(always)]
         unsafe fn unpack_alu(word: usize, second_word: usize, dst: *mut usize) {
             let first = ((0xFF00_0000usize & word) >> 8) |
                          ((0x00FF_0000usize & word) >> 16);
             let second = ((0x0000_FF00usize & word) << 8) |
                         (0x0000_00FFusize & word);
             let third = ((0xFF00_0000usize & second_word) >> 8) |
                          ((0x00FF_0000usize & second_word) >> 16);
             let fourth = ((0x0000_FF00usize & second_word) << 8) |
                         (0x0000_00FFusize & second_word);
+            // Safety: fn invariant used here
             *dst = first;
             *(dst.add(1)) = second;
             *(dst.add(2)) = third;
             *(dst.add(3)) = fourth;
         }
 
+        /// Safety: dst must point to valid space for writing two `usize`s
         #[inline(always)]
         unsafe fn pack_alu(first: usize, second: usize, third: usize, fourth: usize, dst: *mut usize) {
             let word = ((0x00FF_0000usize & first) << 8) |
                        ((0x0000_00FFusize & first) << 16) |
                        ((0x00FF_0000usize & second) >> 8) |
                        (0x0000_00FFusize & second);
             let second_word = ((0x00FF_0000usize & third) << 8) |
                               ((0x0000_00FFusize & third) << 16) |
                               ((0x00FF_0000usize & fourth) >> 8) |
                               (0x0000_00FFusize & fourth);
+            // Safety: fn invariant used here
             *dst = word;
             *(dst.add(1)) = second_word;
         }
     } else {
         ascii_naive!(ascii_to_ascii, u8, u8);
         ascii_naive!(ascii_to_basic_latin, u8, u16);
         ascii_naive!(basic_latin_to_ascii, u16, u8);
     }
 }
 
 cfg_if! {
+    // Safety-usable invariant: this counts the zeroes from the "first byte" of utf-8 data packed into a usize
+    // with the target endianness
     if #[cfg(target_endian = "little")] {
         #[allow(dead_code)]
         #[inline(always)]
         fn count_zeros(word: usize) -> u32 {
             word.trailing_zeros()
         }
     } else {
         #[allow(dead_code)]
@@ -1207,208 +1501,272 @@ cfg_if! {
         fn count_zeros(word: usize) -> u32 {
             word.leading_zeros()
         }
     }
 }
 
 cfg_if! {
     if #[cfg(all(feature = "simd-accel", target_endian = "little", target_arch = "disabled"))] {
+        /// Safety-usable invariant: Will return the value and position of the first non-ASCII byte in the slice in a Some if found.
+        /// In other words, the first element of the Some is always `> 127`
         #[inline(always)]
         pub fn validate_ascii(slice: &[u8]) -> Option<(u8, usize)> {
             let src = slice.as_ptr();
             let len = slice.len();
             let mut offset = 0usize;
+            // Safety: if this check succeeds we're valid for reading/writing at least `stride` elements.
             if SIMD_STRIDE_SIZE <= len {
                 let len_minus_stride = len - SIMD_STRIDE_SIZE;
                 loop {
+                    // Safety: src at offset is valid for a `SIMD_STRIDE_SIZE` read
                     let simd = unsafe { load16_unaligned(src.add(offset)) };
                     if !simd_is_ascii(simd) {
                         break;
                     }
                     offset += SIMD_STRIDE_SIZE;
+                    // This is `offset > len - SIMD_STRIDE_SIZE` which means we always have at least `SIMD_STRIDE_SIZE` elements to munch next time.
                     if offset > len_minus_stride {
                         break;
                     }
                 }
             }
             while offset < len {
                 let code_unit = slice[offset];
                 if code_unit > 127 {
+                    // Safety: Safety-usable invariant upheld here
                     return Some((code_unit, offset));
                 }
                 offset += 1;
             }
             None
         }
     } else if #[cfg(all(feature = "simd-accel", target_feature = "sse2"))] {
+        /// Safety-usable invariant: will return Some() when it encounters non-ASCII, with the first element in the Some being
+        /// guaranteed to be non-ASCII (> 127), and the second being the offset where it is found
         #[inline(always)]
         pub fn validate_ascii(slice: &[u8]) -> Option<(u8, usize)> {
             let src = slice.as_ptr();
             let len = slice.len();
             let mut offset = 0usize;
+            // Safety: if this check succeeds we're valid for reading at least `stride` elements.
             if SIMD_STRIDE_SIZE <= len {
                 // First, process one unaligned vector
+                // Safety: src is valid for a `SIMD_STRIDE_SIZE` read
                 let simd = unsafe { load16_unaligned(src) };
                 let mask = mask_ascii(simd);
                 if mask != 0 {
                     offset = mask.trailing_zeros() as usize;
                     let non_ascii = unsafe { *src.add(offset) };
                     return Some((non_ascii, offset));
                 }
                 offset = SIMD_STRIDE_SIZE;
+                // Safety: Now that offset has changed we don't yet know how much it is valid for
 
                 // We have now seen 16 ASCII bytes. Let's guess that
                 // there will be enough more to justify more expense
                 // in the case of non-ASCII.
                 // Use aligned reads for the sake of old microachitectures.
+                // Safety: this correctly calculates the number of src_units that need to be read before the remaining list is aligned.
+                // This is by definition less than SIMD_ALIGNMENT, which is defined to be equal to SIMD_STRIDE_SIZE.
                 let until_alignment = unsafe { (SIMD_ALIGNMENT - ((src.add(offset) as usize) & SIMD_ALIGNMENT_MASK)) & SIMD_ALIGNMENT_MASK };
                 // This addition won't overflow, because even in the 32-bit PAE case the
                 // address space holds enough code that the slice length can't be that
                 // close to address space size.
                 // offset now equals SIMD_STRIDE_SIZE, hence times 3 below.
+                //
+                // Safety: if this check succeeds we're valid for reading at least `2 * SIMD_STRIDE_SIZE` elements plus `until_alignment`.
+                // The extra SIMD_STRIDE_SIZE in the condition is because `offset` is already `SIMD_STRIDE_SIZE`.
                 if until_alignment + (SIMD_STRIDE_SIZE * 3) <= len {
                     if until_alignment != 0 {
+                        // Safety: this is safe to call since we're valid for this read (and more), and don't care about alignment
+                        // This will copy over bytes that get decoded twice since it's not incrementing `offset` by SIMD_STRIDE_SIZE. This is fine.
                         let simd = unsafe { load16_unaligned(src.add(offset)) };
                         let mask = mask_ascii(simd);
                         if mask != 0 {
                             offset += mask.trailing_zeros() as usize;
                             let non_ascii = unsafe { *src.add(offset) };
                             return Some((non_ascii, offset));
                         }
                         offset += until_alignment;
                     }
+                    // Safety: At this point we're valid for reading 2*SIMD_STRIDE_SIZE elements
+                    // Safety: Now `offset` is aligned for `src`
                     let len_minus_stride_times_two = len - (SIMD_STRIDE_SIZE * 2);
                     loop {
+                        // Safety: We were valid for this read, and were aligned.
                         let first = unsafe { load16_aligned(src.add(offset)) };
                         let second = unsafe { load16_aligned(src.add(offset + SIMD_STRIDE_SIZE)) };
                         if !simd_is_ascii(first | second) {
+                            // Safety: mask_ascii produces a mask of all the high bits.
                             let mask_first = mask_ascii(first);
                             if mask_first != 0 {
+                                // Safety: on little endian systems this will be the number of ascii bytes
+                                // before the first non-ascii, i.e. valid for indexing src
+                                // TODO SAFETY: What about big-endian systems?
                                 offset += mask_first.trailing_zeros() as usize;
                             } else {
                                 let mask_second = mask_ascii(second);
+                                // Safety: on little endian systems this will be the number of ascii bytes
+                                // before the first non-ascii, i.e. valid for indexing src
                                 offset += SIMD_STRIDE_SIZE + mask_second.trailing_zeros() as usize;
                             }
+                            // Safety: We know this is non-ASCII, and can uphold the safety-usable invariant here
                             let non_ascii = unsafe { *src.add(offset) };
+
                             return Some((non_ascii, offset));
                         }
                         offset += SIMD_STRIDE_SIZE * 2;
+                        // Safety: This is `offset > len - 2 * SIMD_STRIDE_SIZE` which means we always have at least `2 * SIMD_STRIDE_SIZE` elements to munch next time.
                         if offset > len_minus_stride_times_two {
                             break;
                         }
                     }
+                    // Safety: if this check succeeds we're valid for reading at least `SIMD_STRIDE_SIZE`
                     if offset + SIMD_STRIDE_SIZE <= len {
-                         let simd = unsafe { load16_aligned(src.add(offset)) };
-                         let mask = mask_ascii(simd);
+                        // Safety: We were valid for this read, and were aligned.
+                        let simd = unsafe { load16_aligned(src.add(offset)) };
+                        // Safety: mask_ascii produces a mask of all the high bits.
+                        let mask = mask_ascii(simd);
                         if mask != 0 {
+                            // Safety: on little endian systems this will be the number of ascii bytes
+                            // before the first non-ascii, i.e. valid for indexing src
                             offset += mask.trailing_zeros() as usize;
                             let non_ascii = unsafe { *src.add(offset) };
+                            // Safety: We know this is non-ASCII, and can uphold the safety-usable invariant here
                             return Some((non_ascii, offset));
                         }
                         offset += SIMD_STRIDE_SIZE;
                     }
                 } else {
+                    // Safety: this is the unaligned branch
                     // At most two iterations, so unroll
+                    // Safety: if this check succeeds we're valid for reading at least `SIMD_STRIDE_SIZE`
                     if offset + SIMD_STRIDE_SIZE <= len {
+                        // Safety: We're valid for this read but must use an unaligned read
                         let simd = unsafe { load16_unaligned(src.add(offset)) };
                         let mask = mask_ascii(simd);
                         if mask != 0 {
                             offset += mask.trailing_zeros() as usize;
                             let non_ascii = unsafe { *src.add(offset) };
+                            // Safety-usable invariant upheld here (same as above)
                             return Some((non_ascii, offset));
                         }
                         offset += SIMD_STRIDE_SIZE;
+                        // Safety: if this check succeeds we're valid for reading at least `SIMD_STRIDE_SIZE`
                         if offset + SIMD_STRIDE_SIZE <= len {
+                            // Safety: We're valid for this read but must use an unaligned read
                              let simd = unsafe { load16_unaligned(src.add(offset)) };
                              let mask = mask_ascii(simd);
                             if mask != 0 {
                                 offset += mask.trailing_zeros() as usize;
                                 let non_ascii = unsafe { *src.add(offset) };
+                                // Safety-usable invariant upheld here (same as above)
                                 return Some((non_ascii, offset));
                             }
                             offset += SIMD_STRIDE_SIZE;
                         }
                     }
                 }
             }
             while offset < len {
+                // Safety: relies straightforwardly on the `len` invariant
                 let code_unit = unsafe { *(src.add(offset)) };
                 if code_unit > 127 {
+                    // Safety-usable invariant upheld here
                     return Some((code_unit, offset));
                 }
                 offset += 1;
             }
             None
         }
     } else {
+        // Safety-usable invariant: returns byte index of first non-ascii byte
         #[inline(always)]
         fn find_non_ascii(word: usize, second_word: usize) -> Option<usize> {
             let word_masked = word & ASCII_MASK;
             let second_masked = second_word & ASCII_MASK;
             if (word_masked | second_masked) == 0 {
+                // Both are ascii, invariant upheld
                 return None;
             }
             if word_masked != 0 {
                 let zeros = count_zeros(word_masked);
-                // `zeros` now contains 7 (for the seven bits of non-ASCII)
+                // `zeros` now contains 0 to 7 (for the seven bits of masked ASCII in little endian,
+                // or up to 7 bits of non-ASCII in big endian if the first byte is non-ASCII)
                 // plus 8 times the number of ASCII in text order before the
                 // non-ASCII byte in the little-endian case or 8 times the number of ASCII in
                 // text order before the non-ASCII byte in the big-endian case.
                 let num_ascii = (zeros >> 3) as usize;
+                // Safety-usable invariant upheld here
                 return Some(num_ascii);
             }
             let zeros = count_zeros(second_masked);
-            // `zeros` now contains 7 (for the seven bits of non-ASCII)
+            // `zeros` now contains 0 to 7 (for the seven bits of masked ASCII in little endian,
+            // or up to 7 bits of non-ASCII in big endian if the first byte is non-ASCII)
             // plus 8 times the number of ASCII in text order before the
             // non-ASCII byte in the little-endian case or 8 times the number of ASCII in
             // text order before the non-ASCII byte in the big-endian case.
             let num_ascii = (zeros >> 3) as usize;
+            // Safety-usable invariant upheld here
             Some(ALU_ALIGNMENT + num_ascii)
         }
 
+        /// Safety: `src` must be valid for the reads of two `usize`s
+        ///
+        /// Safety-usable invariant: will return byte index of first non-ascii byte
         #[inline(always)]
         unsafe fn validate_ascii_stride(src: *const usize) -> Option<usize> {
             let word = *src;
             let second_word = *(src.add(1));
             find_non_ascii(word, second_word)
         }
 
+        /// Safety-usable invariant: will return Some() when it encounters non-ASCII, with the first element in the Some being
+        /// guaranteed to be non-ASCII (> 127), and the second being the offset where it is found
         #[cfg_attr(feature = "cargo-clippy", allow(cast_ptr_alignment))]
         #[inline(always)]
         pub fn validate_ascii(slice: &[u8]) -> Option<(u8, usize)> {
             let src = slice.as_ptr();
             let len = slice.len();
             let mut offset = 0usize;
             let mut until_alignment = (ALU_ALIGNMENT - ((src as usize) & ALU_ALIGNMENT_MASK)) & ALU_ALIGNMENT_MASK;
+            // Safety: If this check fails we're valid to read `until_alignment + ALU_STRIDE_SIZE` elements
             if until_alignment + ALU_STRIDE_SIZE <= len {
                 while until_alignment != 0 {
                     let code_unit = slice[offset];
                     if code_unit > 127 {
+                        // Safety-usable invairant upheld here
                         return Some((code_unit, offset));
                     }
                     offset += 1;
                     until_alignment -= 1;
                 }
+                // Safety: At this point we have read until_alignment elements and
+                // are valid for `ALU_STRIDE_SIZE` more.
                 let len_minus_stride = len - ALU_STRIDE_SIZE;
                 loop {
+                    // Safety: we were valid for this read
                     let ptr = unsafe { src.add(offset) as *const usize };
                     if let Some(num_ascii) = unsafe { validate_ascii_stride(ptr) } {
                         offset += num_ascii;
+                        // Safety-usable invairant upheld here using the invariant from validate_ascii_stride()
                         return Some((unsafe { *(src.add(offset)) }, offset));
                     }
                     offset += ALU_STRIDE_SIZE;
+                    // Safety: This is `offset > ALU_STRIDE_SIZE` which means we always have at least `2 * ALU_STRIDE_SIZE` elements to munch next time.
                     if offset > len_minus_stride {
                         break;
                     }
                 }
             }
             while offset < len {
                 let code_unit = slice[offset];
                 if code_unit > 127 {
+                    // Safety-usable invairant upheld here
                     return Some((code_unit, offset));
                 }
                 offset += 1;
            }
            None
         }
 
     }
@@ -1423,70 +1781,88 @@ cfg_if! {
         // vector reads without vector writes.
 
         pub const ALU_STRIDE_SIZE: usize = 8;
 
         pub const ALU_ALIGNMENT: usize = 4;
 
         pub const ALU_ALIGNMENT_MASK: usize = 3;
     } else {
+        // Safety: src points to two valid `usize`s, dst points to four valid `usize`s
         #[inline(always)]
         unsafe fn unpack_latin1_stride_alu(src: *const usize, dst: *mut usize) {
+            // Safety: src safety invariant used here
             let word = *src;
             let second_word = *(src.add(1));
+            // Safety: dst safety invariant passed down
             unpack_alu(word, second_word, dst);
         }
 
+        // Safety: src points to four valid `usize`s, dst points to two valid `usize`s
         #[inline(always)]
         unsafe fn pack_latin1_stride_alu(src: *const usize, dst: *mut usize) {
+            // Safety: src safety invariant used here
             let first = *src;
             let second = *(src.add(1));
             let third = *(src.add(2));
             let fourth = *(src.add(3));
+            // Safety: dst safety invariant passed down
             pack_alu(first, second, third, fourth, dst);
         }
 
+        // Safety: src points to two valid `usize`s, dst points to four valid `usize`s
         #[inline(always)]
         unsafe fn ascii_to_basic_latin_stride_alu(src: *const usize, dst: *mut usize) -> bool {
+            // Safety: src safety invariant used here
             let word = *src;
             let second_word = *(src.add(1));
             // Check if the words contains non-ASCII
             if (word & ASCII_MASK) | (second_word & ASCII_MASK) != 0 {
                 return false;
             }
+            // Safety: dst safety invariant passed down
             unpack_alu(word, second_word, dst);
             true
         }
 
+        // Safety: src points four valid `usize`s, dst points to two valid `usize`s
         #[inline(always)]
         unsafe fn basic_latin_to_ascii_stride_alu(src: *const usize, dst: *mut usize) -> bool {
+            // Safety: src safety invariant used here
             let first = *src;
             let second = *(src.add(1));
             let third = *(src.add(2));
             let fourth = *(src.add(3));
             if (first & BASIC_LATIN_MASK) | (second & BASIC_LATIN_MASK) | (third & BASIC_LATIN_MASK) | (fourth & BASIC_LATIN_MASK) != 0 {
                 return false;
             }
+            // Safety: dst safety invariant passed down
             pack_alu(first, second, third, fourth, dst);
             true
         }
 
+        // Safety: src, dst both point to two valid `usize`s each
+        // Safety-usable invariant: Will return byte index of first non-ascii byte.
         #[inline(always)]
         unsafe fn ascii_to_ascii_stride(src: *const usize, dst: *mut usize) -> Option<usize> {
+            // Safety: src safety invariant used here
             let word = *src;
             let second_word = *(src.add(1));
+            // Safety: src safety invariant used here
             *dst = word;
             *(dst.add(1)) = second_word;
+            // Relies on safety-usable invariant here
             find_non_ascii(word, second_word)
         }
 
         basic_latin_alu!(ascii_to_basic_latin, u8, u16, ascii_to_basic_latin_stride_alu);
         basic_latin_alu!(basic_latin_to_ascii, u16, u8, basic_latin_to_ascii_stride_alu);
         latin1_alu!(unpack_latin1, u8, u16, unpack_latin1_stride_alu);
         latin1_alu!(pack_latin1, u16, u8, pack_latin1_stride_alu);
+        // Safety invariant upheld: ascii_to_ascii_stride will return byte index of first non-ascii if found
         ascii_alu!(ascii_to_ascii, u8, u8, ascii_to_ascii_stride);
     }
 }
 
 pub fn ascii_valid_up_to(bytes: &[u8]) -> usize {
     match validate_ascii(bytes) {
         None => bytes.len(),
         Some((_, num_valid)) => num_valid,
diff --git a/third_party/rust/encoding_rs/src/handles.rs b/third_party/rust/encoding_rs/src/handles.rs
--- third_party/rust/encoding_rs/src/handles.rs
+++ third_party/rust/encoding_rs/src/handles.rs
@@ -29,17 +29,17 @@ use crate::simd_funcs::*;
 #[cfg(all(
     feature = "simd-accel",
     any(
         target_feature = "sse2",
         all(target_endian = "little", target_arch = "aarch64"),
         all(target_endian = "little", target_feature = "neon")
     )
 ))]
-use packed_simd::u16x8;
+use core::simd::u16x8;
 
 use super::DecoderResult;
 use super::EncoderResult;
 use crate::ascii::*;
 use crate::utf_8::convert_utf8_to_utf16_up_to_invalid;
 use crate::utf_8::utf8_valid_up_to;
 
 pub enum Space<T> {
@@ -85,84 +85,100 @@ impl Endian for LittleEndian {
     const OPPOSITE_ENDIAN: bool = false;
 
     #[cfg(target_endian = "big")]
     const OPPOSITE_ENDIAN: bool = true;
 }
 
 #[derive(Debug, Copy, Clone)]
 struct UnalignedU16Slice {
+    // Safety invariant: ptr must be valid for reading 2*len bytes
     ptr: *const u8,
     len: usize,
 }
 
 impl UnalignedU16Slice {
+    /// Safety: ptr must be valid for reading 2*len bytes
     #[inline(always)]
     pub unsafe fn new(ptr: *const u8, len: usize) -> UnalignedU16Slice {
+        // Safety: field invariant passed up to caller here
         UnalignedU16Slice { ptr, len }
     }
 
     #[inline(always)]
     pub fn trim_last(&mut self) {
         assert!(self.len > 0);
+        // Safety: invariant upheld here: a slice is still valid with a shorter len
         self.len -= 1;
     }
 
     #[inline(always)]
     pub fn at(&self, i: usize) -> u16 {
         use core::mem::MaybeUninit;
 
         assert!(i < self.len);
         unsafe {
             let mut u: MaybeUninit<u16> = MaybeUninit::uninit();
+            // Safety: i is at most len - 1, which works here
             ::core::ptr::copy_nonoverlapping(self.ptr.add(i * 2), u.as_mut_ptr() as *mut u8, 2);
+            // Safety: valid read above lets us do this
             u.assume_init()
         }
     }
 
     #[cfg(feature = "simd-accel")]
     #[inline(always)]
     pub fn simd_at(&self, i: usize) -> u16x8 {
+        // Safety: i/len are on the scale of u16s, each one corresponds to 2 u8s
         assert!(i + SIMD_STRIDE_SIZE / 2 <= self.len);
         let byte_index = i * 2;
+        // Safety: load16_unaligned needs SIMD_STRIDE_SIZE=16 u8 elements to read,
+        // or 16/2 = 8 u16 elements to read.
+        // We have checked that we have at least that many above.
+
         unsafe { to_u16_lanes(load16_unaligned(self.ptr.add(byte_index))) }
     }
 
     #[inline(always)]
     pub fn len(&self) -> usize {
         self.len
     }
 
     #[inline(always)]
     pub fn tail(&self, from: usize) -> UnalignedU16Slice {
         // XXX the return value should be restricted not to
         // outlive self.
         assert!(from <= self.len);
+        // Safety: This upholds the same invariant: `from` is in bounds and we're returning a shorter slice
         unsafe { UnalignedU16Slice::new(self.ptr.add(from * 2), self.len - from) }
     }
 
     #[cfg(feature = "simd-accel")]
     #[inline(always)]
     pub fn copy_bmp_to<E: Endian>(&self, other: &mut [u16]) -> Option<(u16, usize)> {
         assert!(self.len <= other.len());
         let mut offset = 0;
+        // Safety: SIMD_STRIDE_SIZE is measured in bytes, whereas len is in u16s. We check we can
+        // munch SIMD_STRIDE_SIZE / 2 u16s which means we can write SIMD_STRIDE_SIZE u8s
         if SIMD_STRIDE_SIZE / 2 <= self.len {
             let len_minus_stride = self.len - SIMD_STRIDE_SIZE / 2;
             loop {
                 let mut simd = self.simd_at(offset);
                 if E::OPPOSITE_ENDIAN {
                     simd = simd_byte_swap(simd);
                 }
+                // Safety: we have enough space on the other side to write this
                 unsafe {
                     store8_unaligned(other.as_mut_ptr().add(offset), simd);
                 }
                 if contains_surrogates(simd) {
                     break;
                 }
                 offset += SIMD_STRIDE_SIZE / 2;
+                // Safety: This ensures we still have space for writing SIMD_STRIDE_SIZE u8s
                 if offset > len_minus_stride {
                     break;
                 }
             }
         }
         while offset < self.len {
             let unit = swap_if_opposite_endian::<E>(self.at(offset));
             other[offset] = unit;
@@ -231,33 +247,37 @@ fn copy_unaligned_basic_latin_to_ascii<E
 #[cfg(feature = "simd-accel")]
 #[inline(always)]
 fn copy_unaligned_basic_latin_to_ascii<E: Endian>(
     src: UnalignedU16Slice,
     dst: &mut [u8],
 ) -> CopyAsciiResult<usize, (u16, usize)> {
     let len = ::core::cmp::min(src.len(), dst.len());
     let mut offset = 0;
+    // Safety: This check ensures we are able to read/write at least SIMD_STRIDE_SIZE elements
     if SIMD_STRIDE_SIZE <= len {
         let len_minus_stride = len - SIMD_STRIDE_SIZE;
         loop {
             let mut first = src.simd_at(offset);
             let mut second = src.simd_at(offset + (SIMD_STRIDE_SIZE / 2));
             if E::OPPOSITE_ENDIAN {
                 first = simd_byte_swap(first);
                 second = simd_byte_swap(second);
             }
             if !simd_is_basic_latin(first | second) {
                 break;
             }
             let packed = simd_pack(first, second);
+            // Safety: We are able to write SIMD_STRIDE_SIZE elements in this iteration
             unsafe {
                 store16_unaligned(dst.as_mut_ptr().add(offset), packed);
             }
             offset += SIMD_STRIDE_SIZE;
+            // Safety: This is `offset > len - SIMD_STRIDE_SIZE`, which ensures that we can write at least SIMD_STRIDE_SIZE elements
+            // in the next iteration
             if offset > len_minus_stride {
                 break;
             }
         }
     }
     copy_unaligned_basic_latin_to_ascii_alu::<E>(src.tail(offset), &mut dst[offset..], offset)
 }
 
@@ -632,94 +652,106 @@ impl<'a> Utf16Destination<'a> {
     #[inline(always)]
     fn write_astral(&mut self, astral: u32) {
         debug_assert!(astral > 0xFFFF);
         debug_assert!(astral <= 0x10_FFFF);
         self.write_code_unit((0xD7C0 + (astral >> 10)) as u16);
         self.write_code_unit((0xDC00 + (astral & 0x3FF)) as u16);
     }
     #[inline(always)]
-    pub fn write_surrogate_pair(&mut self, high: u16, low: u16) {
+    fn write_surrogate_pair(&mut self, high: u16, low: u16) {
         self.write_code_unit(high);
         self.write_code_unit(low);
     }
     #[inline(always)]
     fn write_big5_combination(&mut self, combined: u16, combining: u16) {
         self.write_bmp_excl_ascii(combined);
         self.write_bmp_excl_ascii(combining);
     }
+    // Safety-usable invariant: CopyAsciiResult::GoOn will only contain bytes >=0x80
     #[inline(always)]
     pub fn copy_ascii_from_check_space_bmp<'b>(
         &'b mut self,
         source: &mut ByteSource,
     ) -> CopyAsciiResult<(DecoderResult, usize, usize), (u8, Utf16BmpHandle<'b, 'a>)> {
         let non_ascii_ret = {
             let src_remaining = &source.slice[source.pos..];
             let dst_remaining = &mut self.slice[self.pos..];
             let (pending, length) = if dst_remaining.len() < src_remaining.len() {
                 (DecoderResult::OutputFull, dst_remaining.len())
             } else {
                 (DecoderResult::InputEmpty, src_remaining.len())
             };
+            // Safety: This function is documented as needing valid pointers for src/dest and len, which
+            // is true since we've passed the minumum length of the two
             match unsafe {
                 ascii_to_basic_latin(src_remaining.as_ptr(), dst_remaining.as_mut_ptr(), length)
             } {
                 None => {
                     source.pos += length;
                     self.pos += length;
                     return CopyAsciiResult::Stop((pending, source.pos, self.pos));
                 }
+                // Safety: the function is documented as returning bytes >=0x80 in the Some
                 Some((non_ascii, consumed)) => {
                     source.pos += consumed;
                     self.pos += consumed;
                     source.pos += 1; // +1 for non_ascii
+                                     // Safety: non-ascii bubbled out here
                     non_ascii
                 }
             }
         };
+        // Safety: non-ascii returned here
         CopyAsciiResult::GoOn((non_ascii_ret, Utf16BmpHandle::new(self)))
     }
+    // Safety-usable invariant: CopyAsciiResult::GoOn will only contain bytes >=0x80
     #[inline(always)]
     pub fn copy_ascii_from_check_space_astral<'b>(
         &'b mut self,
         source: &mut ByteSource,
     ) -> CopyAsciiResult<(DecoderResult, usize, usize), (u8, Utf16AstralHandle<'b, 'a>)> {
         let non_ascii_ret = {
             let dst_len = self.slice.len();
             let src_remaining = &source.slice[source.pos..];
             let dst_remaining = &mut self.slice[self.pos..];
             let (pending, length) = if dst_remaining.len() < src_remaining.len() {
                 (DecoderResult::OutputFull, dst_remaining.len())
             } else {
                 (DecoderResult::InputEmpty, src_remaining.len())
             };
+            // Safety: This function is documented as needing valid pointers for src/dest and len, which
+            // is true since we've passed the minumum length of the two
             match unsafe {
                 ascii_to_basic_latin(src_remaining.as_ptr(), dst_remaining.as_mut_ptr(), length)
             } {
                 None => {
                     source.pos += length;
                     self.pos += length;
                     return CopyAsciiResult::Stop((pending, source.pos, self.pos));
                 }
+                // Safety: the function is documented as returning bytes >=0x80 in the Some
                 Some((non_ascii, consumed)) => {
                     source.pos += consumed;
                     self.pos += consumed;
                     if self.pos + 1 < dst_len {
                         source.pos += 1; // +1 for non_ascii
+                                         // Safety: non-ascii bubbled out here
                         non_ascii
                     } else {
                         return CopyAsciiResult::Stop((
                             DecoderResult::OutputFull,
                             source.pos,
                             self.pos,
                         ));
                     }
                 }
             }
         };
+        // Safety: non-ascii returned here
         CopyAsciiResult::GoOn((non_ascii_ret, Utf16AstralHandle::new(self)))
     }
     #[inline(always)]
     pub fn copy_utf8_up_to_invalid_from(&mut self, source: &mut ByteSource) {
         let src_remaining = &source.slice[source.pos..];
         let dst_remaining = &mut self.slice[self.pos..];
         let (read, written) = convert_utf8_to_utf16_up_to_invalid(src_remaining, dst_remaining);
         source.pos += read;
diff --git a/third_party/rust/encoding_rs/src/lib.rs b/third_party/rust/encoding_rs/src/lib.rs
--- third_party/rust/encoding_rs/src/lib.rs
+++ third_party/rust/encoding_rs/src/lib.rs
@@ -684,37 +684,26 @@
 //! <tr><td>TIS-620</td><td>windows-874</td></tr>
 //! </tbody>
 //! </table>
 //!
 //! See the section [_UTF-16LE, UTF-16BE and Unicode Encoding Schemes_](#utf-16le-utf-16be-and-unicode-encoding-schemes)
 //! for discussion about the UTF-16 family.
 
 #![no_std]
-#![cfg_attr(feature = "simd-accel", feature(core_intrinsics))]
+#![cfg_attr(feature = "simd-accel", feature(core_intrinsics, portable_simd))]
 
 #[cfg(feature = "alloc")]
 #[cfg_attr(test, macro_use)]
 extern crate alloc;
 
 extern crate core;
 #[macro_use]
 extern crate cfg_if;
 
-#[cfg(all(
-    feature = "simd-accel",
-    any(
-        target_feature = "sse2",
-        all(target_endian = "little", target_arch = "aarch64"),
-        all(target_endian = "little", target_feature = "neon")
-    )
-))]
-#[macro_use(shuffle)]
-extern crate packed_simd;
-
 #[cfg(feature = "serde")]
 extern crate serde;
 
 #[cfg(all(test, feature = "serde"))]
 extern crate bincode;
 #[cfg(all(test, feature = "serde"))]
 #[macro_use]
 extern crate serde_derive;
diff --git a/third_party/rust/encoding_rs/src/mem.rs b/third_party/rust/encoding_rs/src/mem.rs
--- third_party/rust/encoding_rs/src/mem.rs
+++ third_party/rust/encoding_rs/src/mem.rs
@@ -111,16 +111,21 @@ macro_rules! by_unit_check_alu {
                             until_alignment -= 1;
                         }
                         if accu >= $bound {
                             return false;
                         }
                     }
                     let len_minus_stride = len - ALU_ALIGNMENT / unit_size;
                     if offset + (4 * (ALU_ALIGNMENT / unit_size)) <= len {
+                        // Safety: the above check lets us perform 4 consecutive reads of
+                        // length ALU_ALIGNMENT / unit_size. ALU_ALIGNMENT is the size of usize, and unit_size
+                        // is the size of the `src` pointer, so this is equal to performing four usize reads.
+                        //
+                        // This invariant is upheld on all loop iterations
                         let len_minus_unroll = len - (4 * (ALU_ALIGNMENT / unit_size));
                         loop {
                             let unroll_accu = unsafe { *(src.add(offset) as *const usize) }
                                 | unsafe {
                                     *(src.add(offset + (ALU_ALIGNMENT / unit_size)) as *const usize)
                                 }
                                 | unsafe {
                                     *(src.add(offset + (2 * (ALU_ALIGNMENT / unit_size)))
@@ -129,22 +134,24 @@ macro_rules! by_unit_check_alu {
                                 | unsafe {
                                     *(src.add(offset + (3 * (ALU_ALIGNMENT / unit_size)))
                                         as *const usize)
                                 };
                             if unroll_accu & $mask != 0 {
                                 return false;
                             }
                             offset += 4 * (ALU_ALIGNMENT / unit_size);
+                            // Safety: this check lets us continue to perform the 4 reads earlier
                             if offset > len_minus_unroll {
                                 break;
                             }
                         }
                     }
                     while offset <= len_minus_stride {
+                        // Safety: the above check lets us perform one usize read.
                         accu |= unsafe { *(src.add(offset) as *const usize) };
                         offset += ALU_ALIGNMENT / unit_size;
                     }
                 }
             }
             for &unit in &buffer[offset..] {
                 accu |= unit as usize;
             }
@@ -184,16 +191,21 @@ macro_rules! by_unit_check_simd {
                             until_alignment -= 1;
                         }
                         if accu >= $bound {
                             return false;
                         }
                     }
                     let len_minus_stride = len - SIMD_STRIDE_SIZE / unit_size;
                     if offset + (4 * (SIMD_STRIDE_SIZE / unit_size)) <= len {
+                        // Safety: the above check lets us perform 4 consecutive reads of
+                        // length SIMD_STRIDE_SIZE / unit_size. SIMD_STRIDE_SIZE is the size of $simd_ty, and unit_size
+                        // is the size of the `src` pointer, so this is equal to performing four $simd_ty reads.
+                        //
+                        // This invariant is upheld on all loop iterations
                         let len_minus_unroll = len - (4 * (SIMD_STRIDE_SIZE / unit_size));
                         loop {
                             let unroll_accu = unsafe { *(src.add(offset) as *const $simd_ty) }
                                 | unsafe {
                                     *(src.add(offset + (SIMD_STRIDE_SIZE / unit_size))
                                         as *const $simd_ty)
                                 }
                                 | unsafe {
@@ -203,23 +215,25 @@ macro_rules! by_unit_check_simd {
                                 | unsafe {
                                     *(src.add(offset + (3 * (SIMD_STRIDE_SIZE / unit_size)))
                                         as *const $simd_ty)
                                 };
                             if !$func(unroll_accu) {
                                 return false;
                             }
                             offset += 4 * (SIMD_STRIDE_SIZE / unit_size);
+                            // Safety: this check lets us continue to perform the 4 reads earlier
                             if offset > len_minus_unroll {
                                 break;
                             }
                         }
                     }
                     let mut simd_accu = $splat;
                     while offset <= len_minus_stride {
+                        // Safety: the above check lets us perform one $simd_ty read.
                         simd_accu = simd_accu | unsafe { *(src.add(offset) as *const $simd_ty) };
                         offset += SIMD_STRIDE_SIZE / unit_size;
                     }
                     if !$func(simd_accu) {
                         return false;
                     }
                 }
             }
@@ -229,18 +243,18 @@ macro_rules! by_unit_check_simd {
             accu < $bound
         }
     };
 }
 
 cfg_if! {
     if #[cfg(all(feature = "simd-accel", any(target_feature = "sse2", all(target_endian = "little", target_arch = "aarch64"), all(target_endian = "little", target_feature = "neon"))))] {
         use crate::simd_funcs::*;
-        use packed_simd::u8x16;
-        use packed_simd::u16x8;
+        use core::simd::u8x16;
+        use core::simd::u16x8;
 
         const SIMD_ALIGNMENT: usize = 16;
 
         const SIMD_ALIGNMENT_MASK: usize = 15;
 
         by_unit_check_simd!(is_ascii_impl, u8, u8x16::splat(0), u8x16, 0x80, simd_is_ascii);
         by_unit_check_simd!(is_basic_latin_impl, u16, u16x8::splat(0), u16x8, 0x80, simd_is_basic_latin);
         by_unit_check_simd!(is_utf16_latin1_impl, u16, u16x8::splat(0), u16x8, 0x100, simd_is_latin1);
diff --git a/third_party/rust/encoding_rs/src/simd_funcs.rs b/third_party/rust/encoding_rs/src/simd_funcs.rs
--- third_party/rust/encoding_rs/src/simd_funcs.rs
+++ third_party/rust/encoding_rs/src/simd_funcs.rs
@@ -2,65 +2,84 @@
 // file at the top-level directory of this distribution.
 //
 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
 // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
 // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use packed_simd::u16x8;
-use packed_simd::u8x16;
-use packed_simd::IntoBits;
+use any_all_workaround::all_mask16x8;
+use any_all_workaround::all_mask8x16;
+use any_all_workaround::any_mask16x8;
+use any_all_workaround::any_mask8x16;
+use core::simd::cmp::SimdPartialEq;
+use core::simd::cmp::SimdPartialOrd;
+use core::simd::mask16x8;
+use core::simd::mask8x16;
+use core::simd::simd_swizzle;
+use core::simd::u16x8;
+use core::simd::u8x16;
+use core::simd::ToBytes;
 
 // TODO: Migrate unaligned access to stdlib code if/when the RFC
 // https://github.com/rust-lang/rfcs/pull/1725 is implemented.
 
+/// Safety invariant: ptr must be valid for an unaligned read of 16 bytes
 #[inline(always)]
 pub unsafe fn load16_unaligned(ptr: *const u8) -> u8x16 {
-    let mut simd = ::core::mem::uninitialized();
-    ::core::ptr::copy_nonoverlapping(ptr, &mut simd as *mut u8x16 as *mut u8, 16);
-    simd
+    let mut simd = ::core::mem::MaybeUninit::<u8x16>::uninit();
+    ::core::ptr::copy_nonoverlapping(ptr, simd.as_mut_ptr() as *mut u8, 16);
+    // Safety: copied 16 bytes of initialized memory into this, it is now initialized
+    simd.assume_init()
 }
 
+/// Safety invariant: ptr must be valid for an aligned-for-u8x16 read of 16 bytes
 #[allow(dead_code)]
 #[inline(always)]
 pub unsafe fn load16_aligned(ptr: *const u8) -> u8x16 {
     *(ptr as *const u8x16)
 }
 
+/// Safety invariant: ptr must be valid for an unaligned store of 16 bytes
 #[inline(always)]
 pub unsafe fn store16_unaligned(ptr: *mut u8, s: u8x16) {
     ::core::ptr::copy_nonoverlapping(&s as *const u8x16 as *const u8, ptr, 16);
 }
 
+/// Safety invariant: ptr must be valid for an aligned-for-u8x16 store of 16 bytes
 #[allow(dead_code)]
 #[inline(always)]
 pub unsafe fn store16_aligned(ptr: *mut u8, s: u8x16) {
     *(ptr as *mut u8x16) = s;
 }
 
+/// Safety invariant: ptr must be valid for an unaligned read of 16 bytes
 #[inline(always)]
 pub unsafe fn load8_unaligned(ptr: *const u16) -> u16x8 {
-    let mut simd = ::core::mem::uninitialized();
-    ::core::ptr::copy_nonoverlapping(ptr as *const u8, &mut simd as *mut u16x8 as *mut u8, 16);
-    simd
+    let mut simd = ::core::mem::MaybeUninit::<u16x8>::uninit();
+    ::core::ptr::copy_nonoverlapping(ptr as *const u8, simd.as_mut_ptr() as *mut u8, 16);
+    // Safety: copied 16 bytes of initialized memory into this, it is now initialized
+    simd.assume_init()
 }
 
+/// Safety invariant: ptr must be valid for an aligned-for-u16x8 read of 16 bytes
 #[allow(dead_code)]
 #[inline(always)]
 pub unsafe fn load8_aligned(ptr: *const u16) -> u16x8 {
     *(ptr as *const u16x8)
 }
 
+/// Safety invariant: ptr must be valid for an unaligned store of 16 bytes
 #[inline(always)]
 pub unsafe fn store8_unaligned(ptr: *mut u16, s: u16x8) {
     ::core::ptr::copy_nonoverlapping(&s as *const u16x8 as *const u8, ptr as *mut u8, 16);
 }
 
+/// Safety invariant: ptr must be valid for an aligned-for-u16x8 store of 16 bytes
 #[allow(dead_code)]
 #[inline(always)]
 pub unsafe fn store8_aligned(ptr: *mut u16, s: u16x8) {
     *(ptr as *mut u16x8) = s;
 }
 
 cfg_if! {
     if #[cfg(all(target_feature = "sse2", target_arch = "x86_64"))] {
@@ -95,234 +114,241 @@ cfg_if! {
 pub fn simd_byte_swap(s: u16x8) -> u16x8 {
     let left = s << 8;
     let right = s >> 8;
     left | right
 }
 
 #[inline(always)]
 pub fn to_u16_lanes(s: u8x16) -> u16x8 {
-    s.into_bits()
+    u16x8::from_ne_bytes(s)
 }
 
 cfg_if! {
     if #[cfg(target_feature = "sse2")] {
 
         // Expose low-level mask instead of higher-level conclusion,
         // because the non-ASCII case would perform less well otherwise.
+        // Safety-usable invariant: This returned value is whether each high bit is set
         #[inline(always)]
         pub fn mask_ascii(s: u8x16) -> i32 {
             unsafe {
-                _mm_movemask_epi8(s.into_bits())
+                _mm_movemask_epi8(s.into())
             }
         }
 
     } else {
 
     }
 }
 
 cfg_if! {
     if #[cfg(target_feature = "sse2")] {
         #[inline(always)]
         pub fn simd_is_ascii(s: u8x16) -> bool {
             unsafe {
-                _mm_movemask_epi8(s.into_bits()) == 0
+                // Safety: We have cfg()d the correct platform
+                _mm_movemask_epi8(s.into()) == 0
             }
         }
     } else if #[cfg(target_arch = "aarch64")]{
         #[inline(always)]
         pub fn simd_is_ascii(s: u8x16) -> bool {
             unsafe {
-                vmaxvq_u8(s.into_bits()) < 0x80
+                // Safety: We have cfg()d the correct platform
+                vmaxvq_u8(s.into()) < 0x80
             }
         }
     } else {
         #[inline(always)]
         pub fn simd_is_ascii(s: u8x16) -> bool {
             // This optimizes better on ARM than
             // the lt formulation.
             let highest_ascii = u8x16::splat(0x7F);
-            !s.gt(highest_ascii).any()
+            !any_mask8x16(s.simd_gt(highest_ascii))
         }
     }
 }
 
 cfg_if! {
     if #[cfg(target_feature = "sse2")] {
         #[inline(always)]
         pub fn simd_is_str_latin1(s: u8x16) -> bool {
             if simd_is_ascii(s) {
                 return true;
             }
             let above_str_latin1 = u8x16::splat(0xC4);
-            s.lt(above_str_latin1).all()
+            s.simd_lt(above_str_latin1).all()
         }
     } else if #[cfg(target_arch = "aarch64")]{
         #[inline(always)]
         pub fn simd_is_str_latin1(s: u8x16) -> bool {
             unsafe {
-                vmaxvq_u8(s.into_bits()) < 0xC4
+                // Safety: We have cfg()d the correct platform
+                vmaxvq_u8(s.into()) < 0xC4
             }
         }
     } else {
         #[inline(always)]
         pub fn simd_is_str_latin1(s: u8x16) -> bool {
             let above_str_latin1 = u8x16::splat(0xC4);
-            s.lt(above_str_latin1).all()
+            all_mask8x16(s.simd_lt(above_str_latin1))
         }
     }
 }
 
 cfg_if! {
     if #[cfg(target_arch = "aarch64")]{
         #[inline(always)]
         pub fn simd_is_basic_latin(s: u16x8) -> bool {
             unsafe {
-                vmaxvq_u16(s.into_bits()) < 0x80
+                // Safety: We have cfg()d the correct platform
+                vmaxvq_u16(s.into()) < 0x80
             }
         }
 
         #[inline(always)]
         pub fn simd_is_latin1(s: u16x8) -> bool {
             unsafe {
-                vmaxvq_u16(s.into_bits()) < 0x100
+                // Safety: We have cfg()d the correct platform
+                vmaxvq_u16(s.into()) < 0x100
             }
         }
     } else {
         #[inline(always)]
         pub fn simd_is_basic_latin(s: u16x8) -> bool {
             let above_ascii = u16x8::splat(0x80);
-            s.lt(above_ascii).all()
+            all_mask16x8(s.simd_lt(above_ascii))
         }
 
         #[inline(always)]
         pub fn simd_is_latin1(s: u16x8) -> bool {
             // For some reason, on SSE2 this formulation
             // seems faster in this case while the above
             // function is better the other way round...
             let highest_latin1 = u16x8::splat(0xFF);
-            !s.gt(highest_latin1).any()
+            !any_mask16x8(s.simd_gt(highest_latin1))
         }
     }
 }
 
 #[inline(always)]
 pub fn contains_surrogates(s: u16x8) -> bool {
     let mask = u16x8::splat(0xF800);
     let surrogate_bits = u16x8::splat(0xD800);
-    (s & mask).eq(surrogate_bits).any()
+    any_mask16x8((s & mask).simd_eq(surrogate_bits))
 }
 
 cfg_if! {
     if #[cfg(target_arch = "aarch64")]{
         macro_rules! aarch64_return_false_if_below_hebrew {
             ($s:ident) => ({
                 unsafe {
-                    if vmaxvq_u16($s.into_bits()) < 0x0590 {
+                    // Safety: We have cfg()d the correct platform
+                    if vmaxvq_u16($s.into()) < 0x0590 {
                         return false;
                     }
                 }
             })
         }
 
         macro_rules! non_aarch64_return_false_if_all {
             ($s:ident) => ()
         }
     } else {
         macro_rules! aarch64_return_false_if_below_hebrew {
             ($s:ident) => ()
         }
 
         macro_rules! non_aarch64_return_false_if_all {
             ($s:ident) => ({
-                if $s.all() {
+                if all_mask16x8($s) {
                     return false;
                 }
             })
         }
     }
 }
 
 macro_rules! in_range16x8 {
     ($s:ident, $start:expr, $end:expr) => {{
         // SIMD sub is wrapping
-        ($s - u16x8::splat($start)).lt(u16x8::splat($end - $start))
+        ($s - u16x8::splat($start)).simd_lt(u16x8::splat($end - $start))
     }};
 }
 
 #[inline(always)]
 pub fn is_u16x8_bidi(s: u16x8) -> bool {
     // We try to first quickly refute the RTLness of the vector. If that
     // fails, we do the real RTL check, so in that case we end up wasting
     // the work for the up-front quick checks. Even the quick-check is
     // two-fold in order to return `false` ASAP if everything is below
     // Hebrew.
 
     aarch64_return_false_if_below_hebrew!(s);
 
-    let below_hebrew = s.lt(u16x8::splat(0x0590));
+    let below_hebrew = s.simd_lt(u16x8::splat(0x0590));
 
     non_aarch64_return_false_if_all!(below_hebrew);
 
-    if (below_hebrew | in_range16x8!(s, 0x0900, 0x200F) | in_range16x8!(s, 0x2068, 0xD802)).all() {
+    if all_mask16x8(
+        below_hebrew | in_range16x8!(s, 0x0900, 0x200F) | in_range16x8!(s, 0x2068, 0xD802),
+    ) {
         return false;
     }
 
     // Quick refutation failed. Let's do the full check.
 
-    (in_range16x8!(s, 0x0590, 0x0900)
-        | in_range16x8!(s, 0xFB1D, 0xFE00)
-        | in_range16x8!(s, 0xFE70, 0xFEFF)
-        | in_range16x8!(s, 0xD802, 0xD804)
-        | in_range16x8!(s, 0xD83A, 0xD83C)
-        | s.eq(u16x8::splat(0x200F))
-        | s.eq(u16x8::splat(0x202B))
-        | s.eq(u16x8::splat(0x202E))
-        | s.eq(u16x8::splat(0x2067)))
-    .any()
+    any_mask16x8(
+        (in_range16x8!(s, 0x0590, 0x0900)
+            | in_range16x8!(s, 0xFB1D, 0xFE00)
+            | in_range16x8!(s, 0xFE70, 0xFEFF)
+            | in_range16x8!(s, 0xD802, 0xD804)
+            | in_range16x8!(s, 0xD83A, 0xD83C)
+            | s.simd_eq(u16x8::splat(0x200F))
+            | s.simd_eq(u16x8::splat(0x202B))
+            | s.simd_eq(u16x8::splat(0x202E))
+            | s.simd_eq(u16x8::splat(0x2067))),
+    )
 }
 
 #[inline(always)]
 pub fn simd_unpack(s: u8x16) -> (u16x8, u16x8) {
-    unsafe {
-        let first: u8x16 = shuffle!(
-            s,
-            u8x16::splat(0),
-            [0, 16, 1, 17, 2, 18, 3, 19, 4, 20, 5, 21, 6, 22, 7, 23]
-        );
-        let second: u8x16 = shuffle!(
-            s,
-            u8x16::splat(0),
-            [8, 24, 9, 25, 10, 26, 11, 27, 12, 28, 13, 29, 14, 30, 15, 31]
-        );
-        (first.into_bits(), second.into_bits())
-    }
+    let first: u8x16 = simd_swizzle!(
+        s,
+        u8x16::splat(0),
+        [0, 16, 1, 17, 2, 18, 3, 19, 4, 20, 5, 21, 6, 22, 7, 23]
+    );
+    let second: u8x16 = simd_swizzle!(
+        s,
+        u8x16::splat(0),
+        [8, 24, 9, 25, 10, 26, 11, 27, 12, 28, 13, 29, 14, 30, 15, 31]
+    );
+    (u16x8::from_ne_bytes(first), u16x8::from_ne_bytes(second))
 }
 
 cfg_if! {
     if #[cfg(target_feature = "sse2")] {
         #[inline(always)]
         pub fn simd_pack(a: u16x8, b: u16x8) -> u8x16 {
             unsafe {
-                _mm_packus_epi16(a.into_bits(), b.into_bits()).into_bits()
+                // Safety: We have cfg()d the correct platform
+                _mm_packus_epi16(a.into(), b.into()).into()
             }
         }
     } else {
         #[inline(always)]
         pub fn simd_pack(a: u16x8, b: u16x8) -> u8x16 {
-            unsafe {
-                let first: u8x16 = a.into_bits();
-                let second: u8x16 = b.into_bits();
-                shuffle!(
-                    first,
-                    second,
-                    [0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30]
-                )
-            }
+            let first: u8x16 = a.to_ne_bytes();
+            let second: u8x16 = b.to_ne_bytes();
+            simd_swizzle!(
+                first,
+                second,
+                [0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30]
+            )
         }
     }
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
     use alloc::vec::Vec;
diff --git a/third_party/rust/encoding_rs/src/single_byte.rs b/third_party/rust/encoding_rs/src/single_byte.rs
--- third_party/rust/encoding_rs/src/single_byte.rs
+++ third_party/rust/encoding_rs/src/single_byte.rs
@@ -48,16 +48,19 @@ impl SingleByteDecoder {
                 CopyAsciiResult::GoOn((mut non_ascii, mut handle)) => 'middle: loop {
                     // Start non-boilerplate
                     //
                     // Since the non-ASCIIness of `non_ascii` is hidden from
                     // the optimizer, it can't figure out that it's OK to
                     // statically omit the bound check when accessing
                     // `[u16; 128]` with an index
                     // `non_ascii as usize - 0x80usize`.
+                    //
+                    // Safety: `non_ascii` is a u8 byte >=0x80, from the invariants
+                    // on Utf8Destination::copy_ascii_from_check_space_bmp()
                     let mapped =
                         unsafe { *(self.table.get_unchecked(non_ascii as usize - 0x80usize)) };
                     // let mapped = self.table[non_ascii as usize - 0x80usize];
                     if mapped == 0u16 {
                         return (
                             DecoderResult::Malformed(1, 0),
                             source.consumed(),
                             handle.written(),
@@ -146,82 +149,103 @@ impl SingleByteDecoder {
         dst: &mut [u16],
         _last: bool,
     ) -> (DecoderResult, usize, usize) {
         let (pending, length) = if dst.len() < src.len() {
             (DecoderResult::OutputFull, dst.len())
         } else {
             (DecoderResult::InputEmpty, src.len())
         };
+        // Safety invariant: converted <= length. Quite often we have `converted < length`
+        // which will be separately marked.
         let mut converted = 0usize;
         'outermost: loop {
             match unsafe {
+                // Safety: length is the minimum length, `src/dst + x` will always be valid for reads/writes of `len - x`
                 ascii_to_basic_latin(
                     src.as_ptr().add(converted),
                     dst.as_mut_ptr().add(converted),
                     length - converted,
                 )
             } {
                 None => {
                     return (pending, length, length);
                 }
                 Some((mut non_ascii, consumed)) => {
+                    // Safety invariant: `converted <= length` upheld, since this can only consume
+                    // up to `length - converted` bytes.
+                    //
+                    // Furthermore, in this context,
+                    // we can assume `converted < length` since this branch is only ever hit when
+                    // ascii_to_basic_latin fails to consume the entire slice
                     converted += consumed;
                     'middle: loop {
                         // `converted` doesn't count the reading of `non_ascii` yet.
                         // Since the non-ASCIIness of `non_ascii` is hidden from
                         // the optimizer, it can't figure out that it's OK to
                         // statically omit the bound check when accessing
                         // `[u16; 128]` with an index
                         // `non_ascii as usize - 0x80usize`.
+                        //
+                        // Safety: We can rely on `non_ascii` being between `0x80` and `0xFF` due to
+                        // the invariants of `ascii_to_basic_latin()`, and our table has enough space for that.
                         let mapped =
                             unsafe { *(self.table.get_unchecked(non_ascii as usize - 0x80usize)) };
                         // let mapped = self.table[non_ascii as usize - 0x80usize];
                         if mapped == 0u16 {
                             return (
                                 DecoderResult::Malformed(1, 0),
                                 converted + 1, // +1 `for non_ascii`
                                 converted,
                             );
                         }
                         unsafe {
-                            // The bound check has already been performed
+                            // Safety: As mentioned above, `converted < length`
                             *(dst.get_unchecked_mut(converted)) = mapped;
                         }
+                        // Safety: `converted <= length` upheld, since `converted < length` before this
                         converted += 1;
                         // Next, handle ASCII punctuation and non-ASCII without
                         // going back to ASCII acceleration. Non-ASCII scripts
                         // use ASCII punctuation, so this avoid going to
                         // acceleration just for punctuation/space and then
                         // failing. This is a significant boost to non-ASCII
                         // scripts.
                         // TODO: Split out Latin converters without this part
                         // this stuff makes Latin script-conversion slower.
                         if converted == length {
                             return (pending, length, length);
                         }
+                        // Safety: We are back to `converted < length` because of the == above
+                        // and can perform this check.
                         let mut b = unsafe { *(src.get_unchecked(converted)) };
+                        // Safety: `converted < length` is upheld for this loop
                         'innermost: loop {
                             if b > 127 {
                                 non_ascii = b;
                                 continue 'middle;
                             }
                             // Testing on Haswell says that we should write the
                             // byte unconditionally instead of trying to unread it
                             // to make it part of the next SIMD stride.
                             unsafe {
+                                // Safety: `converted < length` is true for this loop
                                 *(dst.get_unchecked_mut(converted)) = u16::from(b);
                             }
+                            // Safety: We are now at `converted <= length`. We should *not* `continue`
+                            // the loop without reverifying
                             converted += 1;
                             if b < 60 {
                                 // We've got punctuation
                                 if converted == length {
                                     return (pending, length, length);
                                 }
+                                // Safety: we're back to `converted <= length` because of the == above
                                 b = unsafe { *(src.get_unchecked(converted)) };
+                                // Safety: The loop continues as `converted < length`
                                 continue 'innermost;
                             }
                             // We've got markup or ASCII text
                             continue 'outermost;
                         }
                     }
                 }
             }
@@ -229,16 +253,18 @@ impl SingleByteDecoder {
     }
 
     pub fn latin1_byte_compatible_up_to(&self, buffer: &[u8]) -> usize {
         let mut bytes = buffer;
         let mut total = 0;
         loop {
             if let Some((non_ascii, offset)) = validate_ascii(bytes) {
                 total += offset;
+                // Safety: We can rely on `non_ascii` being between `0x80` and `0xFF` due to
+                // the invariants of `ascii_to_basic_latin()`, and our table has enough space for that.
                 let mapped = unsafe { *(self.table.get_unchecked(non_ascii as usize - 0x80usize)) };
                 if mapped != u16::from(non_ascii) {
                     return total;
                 }
                 total += 1;
                 bytes = &bytes[offset + 1..];
             } else {
                 return total;
@@ -379,64 +405,89 @@ impl SingleByteEncoder {
         dst: &mut [u8],
         _last: bool,
     ) -> (EncoderResult, usize, usize) {
         let (pending, length) = if dst.len() < src.len() {
             (EncoderResult::OutputFull, dst.len())
         } else {
             (EncoderResult::InputEmpty, src.len())
         };
+        // Safety invariant: converted <= length. Quite often we have `converted < length`
+        // which will be separately marked.
         let mut converted = 0usize;
         'outermost: loop {
             match unsafe {
+                // Safety: length is the minimum length, `src/dst + x` will always be valid for reads/writes of `len - x`
                 basic_latin_to_ascii(
                     src.as_ptr().add(converted),
                     dst.as_mut_ptr().add(converted),
                     length - converted,
                 )
             } {
                 None => {
                     return (pending, length, length);
                 }
                 Some((mut non_ascii, consumed)) => {
+                    // Safety invariant: `converted <= length` upheld, since this can only consume
+                    // up to `length - converted` bytes.
+                    //
+                    // Furthermore, in this context,
+                    // we can assume `converted < length` since this branch is only ever hit when
+                    // ascii_to_basic_latin fails to consume the entire slice
                     converted += consumed;
                     'middle: loop {
                         // `converted` doesn't count the reading of `non_ascii` yet.
                         match self.encode_u16(non_ascii) {
                             Some(byte) => {
                                 unsafe {
+                                    // Safety: we're allowed this access since `converted < length`
                                     *(dst.get_unchecked_mut(converted)) = byte;
                                 }
                                 converted += 1;
+                                // `converted <= length` now
                             }
                             None => {
                                 // At this point, we need to know if we
                                 // have a surrogate.
                                 let high_bits = non_ascii & 0xFC00u16;
                                 if high_bits == 0xD800u16 {
                                     // high surrogate
                                     if converted + 1 == length {
                                         // End of buffer. This surrogate is unpaired.
                                         return (
                                             EncoderResult::Unmappable('\u{FFFD}'),
                                             converted + 1, // +1 `for non_ascii`
                                             converted,
                                         );
                                     }
+                                    // Safety: convered < length from outside the match, and `converted + 1 != length`,
+                                    // So `converted + 1 < length` as well. We're in bounds
                                     let second =
                                         u32::from(unsafe { *src.get_unchecked(converted + 1) });
                                     if second & 0xFC00u32 != 0xDC00u32 {
                                         return (
                                             EncoderResult::Unmappable('\u{FFFD}'),
                                             converted + 1, // +1 `for non_ascii`
                                             converted,
                                         );
                                     }
                                     // The next code unit is a low surrogate.
                                     let astral: char = unsafe {
+                                        // Safety: We can rely on non_ascii being 0xD800-0xDBFF since the high bits are 0xD800
+                                        // Then, (non_ascii << 10 - 0xD800 << 10) becomes between (0 to 0x3FF) << 10, which is between
+                                        // 0x400 to 0xffc00. Adding the 0x10000 gives a range of 0x10400 to 0x10fc00. Subtracting the 0xDC00
+                                        // gives 0x2800 to 0x102000
+                                        // The second term is between 0xDC00 and 0xDFFF from the check above. This gives a maximum
+                                        // possible range of (0x10400 + 0xDC00) to (0x102000 + 0xDFFF) which is 0x1E000 to 0x10ffff.
+                                        // This is in range.
+                                        //
+                                        // From a Unicode principles perspective this can also be verified as we have checked that `non_ascii` is a high surrogate
+                                        // (0xD800..=0xDBFF), and that `second` is a low surrogate (`0xDC00..=0xDFFF`), and we are applying reverse of the UTC16 transformation
+                                        // algorithm <https://en.wikipedia.org/wiki/UTF-16#Code_points_from_U+010000_to_U+10FFFF>, by applying the high surrogate - 0xD800 to the
+                                        // high ten bits, and the low surrogate - 0xDc00 to the low ten bits, and then adding 0x10000
                                         ::core::char::from_u32_unchecked(
                                             (u32::from(non_ascii) << 10) + second
                                                 - (((0xD800u32 << 10) - 0x1_0000u32) + 0xDC00u32),
                                         )
                                     };
                                     return (
                                         EncoderResult::Unmappable(astral),
                                         converted + 2, // +2 `for non_ascii` and `second`
@@ -451,52 +502,63 @@ impl SingleByteEncoder {
                                         converted,
                                     );
                                 }
                                 return (
                                     EncoderResult::unmappable_from_bmp(non_ascii),
                                     converted + 1, // +1 `for non_ascii`
                                     converted,
                                 );
+                                // Safety: This branch diverges, so no need to uphold invariants on `converted`
                             }
                         }
                         // Next, handle ASCII punctuation and non-ASCII without
                         // going back to ASCII acceleration. Non-ASCII scripts
                         // use ASCII punctuation, so this avoid going to
                         // acceleration just for punctuation/space and then
                         // failing. This is a significant boost to non-ASCII
                         // scripts.
                         // TODO: Split out Latin converters without this part
                         // this stuff makes Latin script-conversion slower.
                         if converted == length {
                             return (pending, length, length);
                         }
+                        // Safety: we're back to `converted < length` due to the == above and can perform
+                        // the unchecked read
                         let mut unit = unsafe { *(src.get_unchecked(converted)) };
                         'innermost: loop {
+                            // Safety: This loop always begins with `converted < length`, see
+                            // the invariant outside and the comment on the continue below
                             if unit > 127 {
                                 non_ascii = unit;
                                 continue 'middle;
                             }
                             // Testing on Haswell says that we should write the
                             // byte unconditionally instead of trying to unread it
                             // to make it part of the next SIMD stride.
                             unsafe {
+                                // Safety: Can rely on converted < length
                                 *(dst.get_unchecked_mut(converted)) = unit as u8;
                             }
                             converted += 1;
+                            // `converted <= length` here
                             if unit < 60 {
                                 // We've got punctuation
                                 if converted == length {
                                     return (pending, length, length);
                                 }
+                                // Safety: `converted < length` due to the == above. The read is safe.
                                 unit = unsafe { *(src.get_unchecked(converted)) };
+                                // Safety: This only happens if `converted < length`, maintaining it
                                 continue 'innermost;
                             }
                             // We've got markup or ASCII text
                             continue 'outermost;
+                            // Safety: All other routes to here diverge so the continue is the only
+                            // way to run the innermost loop.
                         }
                     }
                 }
             }
         }
     }
 }
 
diff --git a/third_party/rust/encoding_rs/src/x_user_defined.rs b/third_party/rust/encoding_rs/src/x_user_defined.rs
--- third_party/rust/encoding_rs/src/x_user_defined.rs
+++ third_party/rust/encoding_rs/src/x_user_defined.rs
@@ -9,22 +9,23 @@
 
 use super::*;
 use crate::handles::*;
 use crate::variant::*;
 
 cfg_if! {
     if #[cfg(feature = "simd-accel")] {
         use simd_funcs::*;
-        use packed_simd::u16x8;
+        use core::simd::u16x8;
+        use core::simd::cmp::SimdPartialOrd;
 
         #[inline(always)]
         fn shift_upper(unpacked: u16x8) -> u16x8 {
             let highest_ascii = u16x8::splat(0x7F);
-            unpacked + unpacked.gt(highest_ascii).select(u16x8::splat(0xF700), u16x8::splat(0))        }
+            unpacked + unpacked.simd_gt(highest_ascii).select(u16x8::splat(0xF700), u16x8::splat(0))        }
     } else {
     }
 }
 
 pub struct UserDefinedDecoder;
 
 impl UserDefinedDecoder {
     pub fn new() -> VariantDecoder {
@@ -111,20 +112,25 @@ impl UserDefinedDecoder {
         } else {
             (DecoderResult::InputEmpty, src.len())
         };
         // Not bothering with alignment
         let tail_start = length & !0xF;
         let simd_iterations = length >> 4;
         let src_ptr = src.as_ptr();
         let dst_ptr = dst.as_mut_ptr();
+        // Safety: This is `for i in 0..length / 16`
         for i in 0..simd_iterations {
+            // Safety: This is in bounds: length is the minumum valid length for both src/dst
+            // and i ranges to length/16, so multiplying by 16 will always be `< length` and can do
+            // a 16 byte read
             let input = unsafe { load16_unaligned(src_ptr.add(i * 16)) };
             let (first, second) = simd_unpack(input);
             unsafe {
+                // Safety: same as above, but this is two consecutive 8-byte reads
                 store8_unaligned(dst_ptr.add(i * 16), shift_upper(first));
                 store8_unaligned(dst_ptr.add((i * 16) + 8), shift_upper(second));
             }
         }
         let src_tail = &src[tail_start..length];
         let dst_tail = &mut dst[tail_start..length];
         src_tail
             .iter()

diff --git a/third_party/rust/encoding_rs/.cargo-checksum.json b/third_party/rust/encoding_rs/.cargo-checksum.json
--- third_party/rust/encoding_rs/.cargo-checksum.json
+++ third_party/rust/encoding_rs/.cargo-checksum.json
@@ -1 +1 @@
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