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Fixes a case where we generate an incorrect mask for pshfhw in the presence

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of undefs and incorrectly determining if we have punpckldq.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63702 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Mon P Wang
2009-02-04 01:16:59 +00:00
parent 556b20ab46
commit 7bcaefaf59
2 changed files with 29 additions and 5 deletions
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11
lib/Target/X86/X86ISelLowering.cpp
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@@ -2317,7 +2317,7 @@ bool static isUNPCKLMask(SDOperand *Elts, unsigned NumElts,
if (!isUndefOrEqual(BitI, j))
return false;
if (V2IsSplat) {
if (isUndefOrEqual(BitI1, NumElts))
if (!isUndefOrEqual(BitI1, NumElts))
return false;
} else {
if (!isUndefOrEqual(BitI1, j + NumElts))
@@ -2652,9 +2652,10 @@ unsigned X86::getShufflePSHUFHWImmediate(SDNode *N) {
for (unsigned i = 7; i >= 4; --i) {
unsigned Val = 0;
SDValue Arg = N->getOperand(i);
if (Arg.getOpcode() != ISD::UNDEF)
if (Arg.getOpcode() != ISD::UNDEF) {
Val = cast<ConstantSDNode>(Arg)->getZExtValue();
Mask |= (Val - 4);
Mask |= (Val - 4);
}
if (i != 4)
Mask <<= 2;
}
@@ -4200,10 +4201,10 @@ X86TargetLowering::LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) {
// new vector_shuffle with the corrected mask.
SDValue NewMask = NormalizeMask(PermMask, DAG);
if (NewMask.getNode() != PermMask.getNode()) {
if (X86::isUNPCKLMask(PermMask.getNode(), true)) {
if (X86::isUNPCKLMask(NewMask.getNode(), true)) {
SDValue NewMask = getUnpacklMask(NumElems, DAG, dl);
return DAG.getNode(ISD::VECTOR_SHUFFLE, dl, VT, V1, V2, NewMask);
} else if (X86::isUNPCKHMask(PermMask.getNode(), true)) {
} else if (X86::isUNPCKHMask(NewMask.getNode(), true)) {
SDValue NewMask = getUnpackhMask(NumElems, DAG, dl);
return DAG.getNode(ISD::VECTOR_SHUFFLE, dl, VT, V1, V2, NewMask);
}