1 files changed, 161 insertions, 0 deletions
diff --git a/test/CodeGen/X86/interval-update-remat.ll b/test/CodeGen/X86/interval-update-remat.ll
new file mode 100644
index 000000000000..4e80e34c9479
--- /dev/null
+++ b/test/CodeGen/X86/interval-update-remat.ll
@@ -0,0 +1,161 @@
+; RUN: llc -verify-regalloc -verify-machineinstrs < %s
+; PR27275: When enabling remat for vreg defined by PHIs, make sure the update
+; of the live range removes dead phi. Otherwise, we may end up with PHIs with
+; incorrect operands and that will trigger assertions or verifier failures
+; in later passes.
+
+target datalayout = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
+target triple = "i386-unknown-linux-gnu"
+
+@b = external global i64, align 8
+@d = external global i32, align 4
+@e = external global i64, align 8
+@h = external global i16, align 2
+@a = external global i8, align 1
+@g = external global i64, align 8
+@j = external global i32, align 4
+@f = external global i16, align 2
+@.str = external unnamed_addr constant [12 x i8], align 1
+
+define void @fn1() {
+entry:
+  %tmp = load i64, i64* @b, align 8
+  %or = or i64 0, 3299921317
+  %and = and i64 %or, %tmp
+  %tmp1 = load i32, i32* @d, align 4
+  br i1 undef, label %lor.rhs, label %lor.end
+
+lor.rhs:                                          ; preds = %entry
+  %tobool3 = icmp ne i8 undef, 0
+  br label %lor.end
+
+lor.end:                                          ; preds = %lor.rhs, %entry
+  %lor.ext = zext i1 undef to i32
+  %tmp2 = load i64, i64* @e, align 8
+  br i1 undef, label %lor.rhs5, label %lor.end7
+
+lor.rhs5:                                         ; preds = %lor.end
+  br label %lor.end7
+
+lor.end7:                                         ; preds = %lor.rhs5, %lor.end
+  %tmp3 = phi i1 [ true, %lor.end ], [ false, %lor.rhs5 ]
+  %neg13 = xor i64 %tmp, -1
+  %conv25 = zext i1 %tmp3 to i32
+  %tobool46 = icmp eq i64 %tmp, 0
+  %.pre = load i16, i16* @h, align 2
+  %tobool10 = icmp eq i16 %.pre, 0
+  %neg.us = xor i32 %tmp1, -1
+  %conv12.us = sext i32 %neg.us to i64
+  %tobool23.us = icmp eq i64 %tmp2, %and
+  %conv39.us = sext i32 %tmp1 to i64
+  br label %LABEL_mSmSDb
+
+LABEL_mSmSDb.loopexit:                            ; preds = %lor.end32.us
+  %conv42.us.lcssa = phi i32 [ %conv42.us, %lor.end32.us ]
+  store i64 undef, i64* @g, align 8
+  br label %LABEL_mSmSDb
+
+LABEL_mSmSDb:                                     ; preds = %LABEL_mSmSDb.loopexit, %lor.end7
+  %tmp4 = phi i32 [ undef, %lor.end7 ], [ %conv42.us.lcssa, %LABEL_mSmSDb.loopexit ]
+  %tmp5 = phi i64 [ %tmp, %lor.end7 ], [ 0, %LABEL_mSmSDb.loopexit ]
+  br i1 %tobool10, label %LABEL_BRBRN.preheader, label %if.then
+
+if.then:                                          ; preds = %LABEL_mSmSDb
+  store i8 undef, i8* @a, align 1
+  br label %LABEL_BRBRN.preheader
+
+LABEL_BRBRN.preheader:                            ; preds = %if.then, %LABEL_mSmSDb
+  %.pre63 = load i64, i64* @g, align 8
+  br i1 %tobool46, label %LABEL_BRBRN.us, label %LABEL_BRBRN.outer
+
+LABEL_BRBRN.outer:                                ; preds = %if.then47, %LABEL_BRBRN.preheader
+  %.ph = phi i32 [ 0, %if.then47 ], [ %tmp4, %LABEL_BRBRN.preheader ]
+  %.ph64 = phi i32 [ %conv50, %if.then47 ], [ %tmp1, %LABEL_BRBRN.preheader ]
+  %.ph65 = phi i64 [ %tmp16, %if.then47 ], [ %.pre63, %LABEL_BRBRN.preheader ]
+  %.ph66 = phi i64 [ 0, %if.then47 ], [ %tmp2, %LABEL_BRBRN.preheader ]
+  %.ph67 = phi i64 [ %.pre56.pre, %if.then47 ], [ %tmp5, %LABEL_BRBRN.preheader ]
+  %neg = xor i32 %.ph64, -1
+  %conv12 = sext i32 %neg to i64
+  %tobool23 = icmp eq i64 %.ph66, %and
+  %tmp6 = load i32, i32* @j, align 4
+  %shr = lshr i32 %conv25, %tmp6
+  %conv39 = sext i32 %.ph64 to i64
+  br label %LABEL_BRBRN
+
+LABEL_BRBRN.us:                                   ; preds = %lor.end32.us, %LABEL_BRBRN.preheader
+  %tmp7 = phi i32 [ %conv42.us, %lor.end32.us ], [ %tmp4, %LABEL_BRBRN.preheader ]
+  %tmp8 = phi i64 [ undef, %lor.end32.us ], [ %.pre63, %LABEL_BRBRN.preheader ]
+  %tmp9 = phi i64 [ %tmp10, %lor.end32.us ], [ %tmp5, %LABEL_BRBRN.preheader ]
+  %mul.us = mul i64 %tmp8, %neg13
+  %mul14.us = mul i64 %mul.us, %conv12.us
+  %cmp.us = icmp sgt i64 %tmp2, %mul14.us
+  %conv16.us = zext i1 %cmp.us to i64
+  %xor.us = xor i64 %conv16.us, %tmp9
+  %rem18.us = urem i32 %lor.ext, %tmp7
+  %conv19.us = zext i32 %rem18.us to i64
+  br i1 %tobool23.us, label %lor.rhs24.us, label %lor.end32.us
+
+lor.rhs24.us:                                     ; preds = %LABEL_BRBRN.us
+  br label %lor.end32.us
+
+lor.end32.us:                                     ; preds = %lor.rhs24.us, %LABEL_BRBRN.us
+  %tmp10 = phi i64 [ -2, %LABEL_BRBRN.us ], [ -1, %lor.rhs24.us ]
+  %xor.us.not = xor i64 %xor.us, -1
+  %neg36.us = and i64 %conv19.us, %xor.us.not
+  %conv37.us = zext i32 %tmp7 to i64
+  %sub38.us = sub nsw i64 %neg36.us, %conv37.us
+  %mul40.us = mul nsw i64 %sub38.us, %conv39.us
+  %neg41.us = xor i64 %mul40.us, 4294967295
+  %conv42.us = trunc i64 %neg41.us to i32
+  %tobool43.us = icmp eq i8 undef, 0
+  br i1 %tobool43.us, label %LABEL_mSmSDb.loopexit, label %LABEL_BRBRN.us
+
+LABEL_BRBRN:                                      ; preds = %lor.end32, %LABEL_BRBRN.outer
+  %tmp11 = phi i32 [ %conv42, %lor.end32 ], [ %.ph, %LABEL_BRBRN.outer ]
+  %tmp12 = phi i64 [ %neg21, %lor.end32 ], [ %.ph65, %LABEL_BRBRN.outer ]
+  %tmp13 = phi i64 [ %conv35, %lor.end32 ], [ %.ph67, %LABEL_BRBRN.outer ]
+  %mul = mul i64 %tmp12, %neg13
+  %mul14 = mul i64 %mul, %conv12
+  %cmp = icmp sgt i64 %.ph66, %mul14
+  %conv16 = zext i1 %cmp to i64
+  %xor = xor i64 %conv16, %tmp13
+  %rem18 = urem i32 %lor.ext, %tmp11
+  %conv19 = zext i32 %rem18 to i64
+  %neg21 = or i64 %xor, undef
+  br i1 %tobool23, label %lor.rhs24, label %lor.end32
+
+lor.rhs24:                                        ; preds = %LABEL_BRBRN
+  %tmp14 = load volatile i16, i16* @f, align 2
+  %conv26 = sext i16 %tmp14 to i32
+  %and27 = and i32 %conv26, %shr
+  %conv28 = sext i32 %and27 to i64
+  %mul29 = mul nsw i64 %conv28, %tmp
+  %and30 = and i64 %mul29, %tmp13
+  %tobool31 = icmp ne i64 %and30, 0
+  br label %lor.end32
+
+lor.end32:                                        ; preds = %lor.rhs24, %LABEL_BRBRN
+  %tmp15 = phi i1 [ true, %LABEL_BRBRN ], [ %tobool31, %lor.rhs24 ]
+  %lor.ext33 = zext i1 %tmp15 to i32
+  %neg34 = xor i32 %lor.ext33, -1
+  %conv35 = sext i32 %neg34 to i64
+  %xor.not = xor i64 %xor, -1
+  %neg36 = and i64 %conv19, %xor.not
+  %conv37 = zext i32 %tmp11 to i64
+  %sub38 = sub nsw i64 %neg36, %conv37
+  %mul40 = mul nsw i64 %sub38, %conv39
+  %neg41 = xor i64 %mul40, 4294967295
+  %conv42 = trunc i64 %neg41 to i32
+  %tobool43 = icmp eq i8 undef, 0
+  br i1 %tobool43, label %if.then47, label %LABEL_BRBRN
+
+if.then47:                                        ; preds = %lor.end32
+  tail call void (i8*, ...) @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i32 0, i32 0), i64 %conv39)
+  %tmp16 = load i64, i64* @g, align 8
+  %neg49 = xor i64 %tmp16, 4294967295
+  %conv50 = trunc i64 %neg49 to i32
+  %.pre56.pre = load i64, i64* @b, align 8
+  br label %LABEL_BRBRN.outer
+}
+
+declare void @printf(i8* nocapture readonly, ...)