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3add36fb90
Third time's the charm? The previous attempt (r265345) caused ASan test failures on X86, as broken CFI caused stack traces to not work. This version of the patch makes sure not to merge with stack adjustments that have CFI, and to not add merged instructions' offests to the CFI about to be generated. This is already covered by the lit tests; I just got the expectations wrong previously. llvm-svn: 265623
27 lines
1.2 KiB
LLVM
27 lines
1.2 KiB
LLVM
; REQUIRES: asserts
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; RUN: llc < %s -mtriple=i686-unknown-linux -relocation-model=static -stats 2>&1 | \
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; RUN: grep asm-printer | grep 14
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;
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; It's possible to schedule this in 14 instructions by avoiding
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; callee-save registers, but the scheduler isn't currently that
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; conervative with registers.
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@size20 = external global i32 ; <i32*> [#uses=1]
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@in5 = external global i8* ; <i8**> [#uses=1]
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define i32 @compare(i8* %a, i8* %b) nounwind {
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%tmp = bitcast i8* %a to i32* ; <i32*> [#uses=1]
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%tmp1 = bitcast i8* %b to i32* ; <i32*> [#uses=1]
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%tmp.upgrd.1 = load i32, i32* @size20 ; <i32> [#uses=1]
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%tmp.upgrd.2 = load i8*, i8** @in5 ; <i8*> [#uses=2]
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%tmp3 = load i32, i32* %tmp1 ; <i32> [#uses=1]
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%gep.upgrd.3 = zext i32 %tmp3 to i64 ; <i64> [#uses=1]
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%tmp4 = getelementptr i8, i8* %tmp.upgrd.2, i64 %gep.upgrd.3 ; <i8*> [#uses=2]
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%tmp7 = load i32, i32* %tmp ; <i32> [#uses=1]
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%gep.upgrd.4 = zext i32 %tmp7 to i64 ; <i64> [#uses=1]
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%tmp8 = getelementptr i8, i8* %tmp.upgrd.2, i64 %gep.upgrd.4 ; <i8*> [#uses=2]
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%tmp.upgrd.5 = tail call i32 @memcmp( i8* %tmp8, i8* %tmp4, i32 %tmp.upgrd.1 ) ; <i32> [#uses=1]
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ret i32 %tmp.upgrd.5
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}
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declare i32 @memcmp(i8*, i8*, i32)
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