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authorMateusz Guzik <mjg@FreeBSD.org>2021-01-31 15:50:34 +0000
committerMateusz Guzik <mjg@FreeBSD.org>2021-01-31 16:07:19 +0000
commit0db6aef407f30c138982b8cde43189aad098b337 (patch)
tree103dd12a86d724863ba13bffa42e1e6e21c55f37 /lib/libc
parent46f168bc665a1aee79d91bd102aef7d4754e7917 (diff)
downloadsrc-0db6aef407f30c138982b8cde43189aad098b337.tar.gz
src-0db6aef407f30c138982b8cde43189aad098b337.zip
amd64: add a note about simd to libc memset, memmove and memcmp
Diffstat (limited to 'lib/libc')
-rw-r--r--lib/libc/amd64/string/memcmp.S6
-rw-r--r--lib/libc/amd64/string/memmove.S6
-rw-r--r--lib/libc/amd64/string/memset.S6
3 files changed, 18 insertions, 0 deletions
diff --git a/lib/libc/amd64/string/memcmp.S b/lib/libc/amd64/string/memcmp.S
index 231ab2175804..67c7df280679 100644
--- a/lib/libc/amd64/string/memcmp.S
+++ b/lib/libc/amd64/string/memcmp.S
@@ -31,6 +31,12 @@
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
+/*
+ * Note: this routine was written with kernel use in mind (read: no simd),
+ * it is only present in userspace as a temporary measure until something
+ * better gets imported.
+ */
+
#define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
ENTRY(memcmp)
diff --git a/lib/libc/amd64/string/memmove.S b/lib/libc/amd64/string/memmove.S
index 4797140a1c16..3d75ff45c798 100644
--- a/lib/libc/amd64/string/memmove.S
+++ b/lib/libc/amd64/string/memmove.S
@@ -29,6 +29,12 @@
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
+/*
+ * Note: this routine was written with kernel use in mind (read: no simd),
+ * it is only present in userspace as a temporary measure until something
+ * better gets imported.
+ */
+
#define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
/*
diff --git a/lib/libc/amd64/string/memset.S b/lib/libc/amd64/string/memset.S
index 0639573a4a3e..050711302354 100644
--- a/lib/libc/amd64/string/memset.S
+++ b/lib/libc/amd64/string/memset.S
@@ -31,6 +31,12 @@
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
+/*
+ * Note: this routine was written with kernel use in mind (read: no simd),
+ * it is only present in userspace as a temporary measure until something
+ * better gets imported.
+ */
+
#define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
.macro MEMSET erms