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https://github.com/c64scene-ar/llvm-6502.git
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Tom Stellard
a4cf325e41
------------------------------------------------------------------------ r214336 | rafael.espindola | 2014-07-30 17:04:00 -0400 (Wed, 30 Jul 2014) | 9 lines SimplifyCFG: Avoid miscompilations due to removed lifetime intrinsics. 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. ------------------------------------------------------------------------ git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_35@232544 91177308-0d34-0410-b5e6-96231b3b80d8
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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