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| author | Evan Cheng <evan.cheng@apple.com> | 2006-04-22 08:34:05 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2006-04-22 08:34:05 +0000 |
| commit | 1900c012f5f15063a9349f6646d7dd1654df38f9 (patch) | |
| tree | 574920d7b4f121227ef996fc7bc1aca8e749786e | |
| parent | a083af14c8130e7cb1f4812b6d6fdcf2cc21882f (diff) | |
Don't do all the lowering stuff for 2-wide build_vector's. Also, minor optimization for shuffle of undef.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27946 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 248393b899..db2b5dd5c6 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -2977,8 +2977,8 @@ SDOperand X86TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) { ShouldXformToMOVLP(V1.Val, PermMask.Val)) return CommuteVectorShuffle(Op, DAG); - bool V1IsSplat = isSplatVector(V1.Val); - bool V2IsSplat = isSplatVector(V2.Val); + bool V1IsSplat = isSplatVector(V1.Val) || V1.getOpcode() == ISD::UNDEF; + bool V2IsSplat = isSplatVector(V2.Val) || V2.getOpcode() == ISD::UNDEF; if (V1IsSplat && !V2IsSplat) { Op = CommuteVectorShuffle(Op, DAG); V1 = Op.getOperand(0); @@ -3137,6 +3137,9 @@ SDOperand X86TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) { return Op; unsigned NumElems = Op.getNumOperands(); + if (NumElems == 2) + return SDOperand(); + unsigned Half = NumElems/2; MVT::ValueType VT = Op.getValueType(); MVT::ValueType EVT = MVT::getVectorBaseType(VT); |