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| author | Chris Lattner <sabre@nondot.org> | 2006-04-07 04:44:06 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-04-07 04:44:06 +0000 |
| commit | f38d47144572275396e6e6611fa5e181e79b2944 (patch) | |
| tree | 7cd932c358b312df0da61f9de4e4a2d9e8700cae /lib/VMCore/ConstantFold.cpp | |
| parent | 8960766d459ef618f5415dab4b19fca67611b054 (diff) | |
Constant fold extractelement(zero, x) -> zero
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27479 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/VMCore/ConstantFold.cpp')
| -rw-r--r-- | lib/VMCore/ConstantFold.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/VMCore/ConstantFold.cpp b/lib/VMCore/ConstantFold.cpp index d63fb6b2db..94c8651609 100644 --- a/lib/VMCore/ConstantFold.cpp +++ b/lib/VMCore/ConstantFold.cpp @@ -836,6 +836,9 @@ Constant *llvm::ConstantFoldExtractElementInstruction(const Constant *Val, const Constant *Idx) { if (isa<UndefValue>(Val)) // ee(undef, x) -> undef return UndefValue::get(cast<PackedType>(Val->getType())->getElementType()); + if (Val->isNullValue()) // ee(zero, x) -> zero + return Constant::getNullValue( + cast<PackedType>(Val->getType())->getElementType()); if (const ConstantPacked *CVal = dyn_cast<ConstantPacked>(Val)) { if (const ConstantUInt *CIdx = dyn_cast<ConstantUInt>(Idx)) { |