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[X86] Begin cleaning up combineOr -> SHLD/SHRD. NFCI.

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In preparation for converting to funnel shifts.

llvm-svn: 349286
This commit is contained in:
Simon Pilgrim 2018-12-15 21:11:49 +00:00
parent 79a641d507
commit c9387a674a
1 changed files with 5 additions and 5 deletions
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10
lib/Target/X86/X86ISelLowering.cpp
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@ -36531,10 +36531,10 @@ static SDValue combineOr(SDNode *N, SelectionDAG &DAG,
// OR( SRL( X, C ), SHL( Y, 32 - C ) ) -> SHRD( X, Y, C )
// OR( SHL( X, C ), SRL( SRL( Y, 1 ), XOR( C, 31 ) ) ) -> SHLD( X, Y, C )
// OR( SRL( X, C ), SHL( SHL( Y, 1 ), XOR( C, 31 ) ) ) -> SHRD( X, Y, C )
unsigned Bits = VT.getSizeInBits();
unsigned Bits = VT.getScalarSizeInBits();
if (ShAmt1.getOpcode() == ISD::SUB) {
SDValue Sum = ShAmt1.getOperand(0);
if (ConstantSDNode *SumC = dyn_cast<ConstantSDNode>(Sum)) {
if (auto *SumC = dyn_cast<ConstantSDNode>(Sum)) {
SDValue ShAmt1Op1 = ShAmt1.getOperand(1);
if (ShAmt1Op1.getOpcode() == ISD::TRUNCATE)
ShAmt1Op1 = ShAmt1Op1.getOperand(0);
@ -36544,8 +36544,8 @@ static SDValue combineOr(SDNode *N, SelectionDAG &DAG,
DAG.getNode(ISD::TRUNCATE, DL,
MVT::i8, ShAmt0));
}
} else if (ConstantSDNode *ShAmt1C = dyn_cast<ConstantSDNode>(ShAmt1)) {
ConstantSDNode *ShAmt0C = dyn_cast<ConstantSDNode>(ShAmt0);
} else if (auto *ShAmt1C = dyn_cast<ConstantSDNode>(ShAmt1)) {
auto *ShAmt0C = dyn_cast<ConstantSDNode>(ShAmt0);
if (ShAmt0C && (ShAmt0C->getSExtValue() + ShAmt1C->getSExtValue()) == Bits)
return DAG.getNode(Opc, DL, VT,
N0.getOperand(0), N1.getOperand(0),
@ -36553,7 +36553,7 @@ static SDValue combineOr(SDNode *N, SelectionDAG &DAG,
MVT::i8, ShAmt0));
} else if (ShAmt1.getOpcode() == ISD::XOR) {
SDValue Mask = ShAmt1.getOperand(1);
if (ConstantSDNode *MaskC = dyn_cast<ConstantSDNode>(Mask)) {
if (auto *MaskC = dyn_cast<ConstantSDNode>(Mask)) {
unsigned InnerShift = (X86ISD::SHLD == Opc ? ISD::SRL : ISD::SHL);
SDValue ShAmt1Op0 = ShAmt1.getOperand(0);
if (ShAmt1Op0.getOpcode() == ISD::TRUNCATE)