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Start using target speficic nodes for shuffles: pshufhw and pshuflw

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llvm-svn: 111837
This commit is contained in:
Bruno Cardoso Lopes 2010-08-23 20:41:02 +00:00
parent 2bce13a3a4
commit ed9ff8d8d0
1 changed files with 19 additions and 1 deletions
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20
lib/Target/X86/X86ISelLowering.cpp
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@ -2558,6 +2558,18 @@ X86TargetLowering::createFastISel(FunctionLoweringInfo &funcInfo) const {
// Other Lowering Hooks
//===----------------------------------------------------------------------===//
static SDValue getTargetShuffleNode(unsigned Opc, DebugLoc dl, EVT VT,
SDValue V1, SDValue V2, unsigned TargetMask, SelectionDAG &DAG) {
switch(Opc) {
default: llvm_unreachable("Unknown x86 shuffle node");
case X86ISD::PSHUFHW:
case X86ISD::PSHUFLW:
return DAG.getNode(Opc, dl, VT, V1, DAG.getConstant(TargetMask, MVT::i8));
}
return SDValue();
}
SDValue X86TargetLowering::getReturnAddressFrameIndex(SelectionDAG &DAG) const {
MachineFunction &MF = DAG.getMachineFunction();
@ -4266,8 +4278,14 @@ X86TargetLowering::LowerVECTOR_SHUFFLEv8i16(SDValue Op,
// If we've eliminated the use of V2, and the new mask is a pshuflw or
// pshufhw, that's as cheap as it gets. Return the new shuffle.
if ((pshufhw && InOrder[0]) || (pshuflw && InOrder[1])) {
return DAG.getVectorShuffle(MVT::v8i16, dl, NewV,
unsigned Opc = pshufhw ? X86ISD::PSHUFHW : X86ISD::PSHUFLW;
unsigned TargetMask = 0;
NewV = DAG.getVectorShuffle(MVT::v8i16, dl, NewV,
DAG.getUNDEF(MVT::v8i16), &MaskVals[0]);
TargetMask = pshufhw ? X86::getShufflePSHUFHWImmediate(NewV.getNode()):
X86::getShufflePSHUFLWImmediate(NewV.getNode());
V1 = NewV.getOperand(0);
return getTargetShuffleNode(Opc, dl, MVT::v8i16, V1, V1, TargetMask, DAG);
}
}