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| author | Chris Lattner <sabre@nondot.org> | 2009-03-20 22:41:15 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2009-03-20 22:41:15 +0000 |
| commit | 344c7c5cc4dd76e3f538dcc3d4f487be0b6ca067 (patch) | |
| tree | c11e8bf54bfc283e12675a7217fb9dc97c276038 /test | |
| parent | ab6b226978644c438a3a7768a06dcd48509d000c (diff) | |
| download | external_llvm-344c7c5cc4dd76e3f538dcc3d4f487be0b6ca067.zip external_llvm-344c7c5cc4dd76e3f538dcc3d4f487be0b6ca067.tar.gz external_llvm-344c7c5cc4dd76e3f538dcc3d4f487be0b6ca067.tar.bz2 | |
Fix instcombine to not introduce undefined shifts when merging two
shifts together. This fixes PR3851.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67411 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/Transforms/InstCombine/2009-03-20-AShrOverShift.ll | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/2009-03-20-AShrOverShift.ll b/test/Transforms/InstCombine/2009-03-20-AShrOverShift.ll new file mode 100644 index 0000000..92ace11 --- /dev/null +++ b/test/Transforms/InstCombine/2009-03-20-AShrOverShift.ll @@ -0,0 +1,9 @@ +; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {ashr i32 %val, 31} +; PR3851 + +define i32 @foo2(i32 %val) nounwind { +entry: + %shr = ashr i32 %val, 15 ; <i32> [#uses=3] + %shr4 = ashr i32 %shr, 17 ; <i32> [#uses=1] + ret i32 %shr4 + } |