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| author | Dan Gohman <gohman@apple.com> | 2011-07-01 01:03:43 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2011-07-01 01:03:43 +0000 |
| commit | 68c0dbc14fb7599987fb3e27be4e12c1ac36535e (patch) | |
| tree | d1eb614605e080339290cc5405e433c3b2ffd0ea /lib/Analysis/InstructionSimplify.cpp | |
| parent | 5e653c925c7da969c3fb5fa9a46263ffb160b81e (diff) | |
| download | external_llvm-68c0dbc14fb7599987fb3e27be4e12c1ac36535e.zip external_llvm-68c0dbc14fb7599987fb3e27be4e12c1ac36535e.tar.gz external_llvm-68c0dbc14fb7599987fb3e27be4e12c1ac36535e.tar.bz2 | |
Improve constant folding of undef for cmp and select operators.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134223 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/InstructionSimplify.cpp')
| -rw-r--r-- | lib/Analysis/InstructionSimplify.cpp | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/lib/Analysis/InstructionSimplify.cpp b/lib/Analysis/InstructionSimplify.cpp index 9d78f8b..8709f6b 100644 --- a/lib/Analysis/InstructionSimplify.cpp +++ b/lib/Analysis/InstructionSimplify.cpp @@ -2204,15 +2204,15 @@ Value *llvm::SimplifySelectInst(Value *CondVal, Value *TrueVal, Value *FalseVal, if (TrueVal == FalseVal) return TrueVal; - if (isa<UndefValue>(TrueVal)) // select C, undef, X -> X - return FalseVal; - if (isa<UndefValue>(FalseVal)) // select C, X, undef -> X - return TrueVal; if (isa<UndefValue>(CondVal)) { // select undef, X, Y -> X or Y if (isa<Constant>(TrueVal)) return TrueVal; return FalseVal; } + if (isa<UndefValue>(TrueVal)) // select C, undef, X -> X + return FalseVal; + if (isa<UndefValue>(FalseVal)) // select C, X, undef -> X + return TrueVal; return 0; } |