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Don't do all the lowering stuff for 2-wide build_vector's. Also, minor optimization for shuffle of undef.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27946 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-04-22 08:34:05 +00:00
parent a083af14c8
commit 1900c012f5
1 changed files with 5 additions and 2 deletions
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7
lib/Target/X86/X86ISelLowering.cpp
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@ -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);