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Fix a performance regression. Use {p}shuf* when there are only two distinct elements in a build_vector. 

llvm-svn: 27945
This commit is contained in:
Evan Cheng 2006-04-22 06:21:46 +00:00
parent 40ff2928ed
commit 16ef94f4e8
1 changed files with 17 additions and 13 deletions
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4
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -3274,6 +3274,7 @@ SDOperand X86TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
return DAG.getNode(ISD::VECTOR_SHUFFLE, VT, V[0], V[1], ShufMask);
}
if (Values.size() > 2) {
// Expand into a number of unpckl*.
// e.g. for v4f32
// Step 1: unpcklps 0, 2 ==> X: <?, ?, 2, 0>
@ -3291,6 +3292,9 @@ SDOperand X86TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
}
return V[0];
}
return SDOperand();
}
case ISD::EXTRACT_VECTOR_ELT: {
if (!isa<ConstantSDNode>(Op.getOperand(1)))
return SDOperand();