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d0d1fa9454
The lifetime intrinsics need some work in order to make it clear which optimizations are or are not valid. For now dropping this optimization avoids a miscompilation. Patch by Björn Steinbrink. llvm-svn: 214336
30 lines
604 B
LLVM
30 lines
604 B
LLVM
; RUN: opt < %s -simplifycfg -S | FileCheck %s
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; Test that a lifetime intrinsic isn't removed because that would change semantics
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; CHECK: foo
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; CHECK: entry:
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; CHECK: bb0:
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; CHECK: bb1:
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; CHECK: ret
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define void @foo(i1 %x) {
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entry:
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%a = alloca i8
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call void @llvm.lifetime.start(i64 -1, i8* %a) nounwind
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br i1 %x, label %bb0, label %bb1
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bb0:
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call void @llvm.lifetime.end(i64 -1, i8* %a) nounwind
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br label %bb1
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bb1:
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call void @f()
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ret void
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}
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declare void @f()
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declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind
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declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind
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