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| author | Dale Johannesen <dalej@apple.com> | 2009-07-14 00:45:38 +0000 |
|---|---|---|
| committer | Dale Johannesen <dalej@apple.com> | 2009-07-14 00:45:38 +0000 |
| commit | 4458ab0d83c33a649c61355a4d80e94014193856 (patch) | |
| tree | e0a43bf94fd3e8633ca24eb61cc7e77289180c5d /test/Transforms/SimplifyCFG | |
| parent | d9ef1a860e01321cacbd57b6f7c154f399c813d4 (diff) | |
| download | external_llvm-4458ab0d83c33a649c61355a4d80e94014193856.zip external_llvm-4458ab0d83c33a649c61355a4d80e94014193856.tar.gz external_llvm-4458ab0d83c33a649c61355a4d80e94014193856.tar.bz2 | |
Don't delete asm's just because their inputs are undefined;
xor R, R is a common and valid idiom for zeroing a register, for example.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75571 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/SimplifyCFG')
| -rw-r--r-- | test/Transforms/SimplifyCFG/2009-07-13-no-delete-asm.ll | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/test/Transforms/SimplifyCFG/2009-07-13-no-delete-asm.ll b/test/Transforms/SimplifyCFG/2009-07-13-no-delete-asm.ll new file mode 100644 index 0000000..4664ee0 --- /dev/null +++ b/test/Transforms/SimplifyCFG/2009-07-13-no-delete-asm.ll @@ -0,0 +1,11 @@ +; RUN: llvm-as < %s | opt -simplifycfg | llvm-dis | grep xor +; ModuleID = '<stdin>' +target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128" +target triple = "i386-apple-darwin9.6" + +define void @bar() nounwind { +entry: + store i16 undef, i16* null + %asmtmp = call i32 asm sideeffect "xor $0, $0", "=={bx},rm,~{dirflag},~{fpsr},~{flags},~{memory}"(i16 undef) nounwind ; <i32> [#uses=0] + ret void +} |