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[X86] Simplify code. NFC.

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Replaced some logic that checked if a build_vector node is doing a splat of a
non-undef value with a call to method BuildVectorSDNode::getSplatValue().
No functional change intended.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223354 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrea Di Biagio 2014-12-04 11:21:44 +00:00
parent d27b0b9489
commit e6cb70164e
1 changed files with 6 additions and 16 deletions
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22
lib/Target/X86/X86ISelLowering.cpp
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@ -18447,22 +18447,12 @@ static SDValue LowerScalarVariableShift(SDValue Op, SelectionDAG &DAG,
SDValue BaseShAmt;
EVT EltVT = VT.getVectorElementType();
if (Amt.getOpcode() == ISD::BUILD_VECTOR) {
unsigned NumElts = VT.getVectorNumElements();
unsigned i, j;
for (i = 0; i != NumElts; ++i) {
if (Amt.getOperand(i).getOpcode() == ISD::UNDEF)
continue;
break;
}
for (j = i; j != NumElts; ++j) {
SDValue Arg = Amt.getOperand(j);
if (Arg.getOpcode() == ISD::UNDEF) continue;
if (Arg != Amt.getOperand(i))
break;
}
if (i != NumElts && j == NumElts)
BaseShAmt = Amt.getOperand(i);
if (BuildVectorSDNode *BV = dyn_cast<BuildVectorSDNode>(Amt)) {
// Check if this build_vector node is doing a splat.
// If so, then set BaseShAmt equal to the splat value.
BaseShAmt = BV->getSplatValue();
if (BaseShAmt && BaseShAmt.getOpcode() == ISD::UNDEF)
BaseShAmt = SDValue();
} else {
if (Amt.getOpcode() == ISD::EXTRACT_SUBVECTOR)
Amt = Amt.getOperand(0);