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Merged nested ifs. NFCI. 

llvm-svn: 284616
This commit is contained in:
Simon Pilgrim 2016-10-19 17:30:24 +00:00
parent 504f3844ae
commit e32d0f8413
1 changed files with 6 additions and 7 deletions
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13
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -4678,13 +4678,12 @@ SDValue DAGCombiner::visitSHL(SDNode *N) {
}
// fold (shl (mul x, c1), c2) -> (mul x, c1 << c2)
if (N0.getOpcode() == ISD::MUL && N0.getNode()->hasOneUse()) {
if (isConstantOrConstantVector(N1, /* No Opaques */ true) &&
isConstantOrConstantVector(N0.getOperand(1), /* No Opaques */ true)) {
SDValue Shl = DAG.getNode(ISD::SHL, SDLoc(N1), VT, N0.getOperand(1), N1);
AddToWorklist(Shl.getNode());
return DAG.getNode(ISD::MUL, SDLoc(N), VT, N0.getOperand(0), Shl);
}
if (N0.getOpcode() == ISD::MUL && N0.getNode()->hasOneUse() &&
isConstantOrConstantVector(N1, /* No Opaques */ true) &&
isConstantOrConstantVector(N0.getOperand(1), /* No Opaques */ true)) {
SDValue Shl = DAG.getNode(ISD::SHL, SDLoc(N1), VT, N0.getOperand(1), N1);
AddToWorklist(Shl.getNode());
return DAG.getNode(ISD::MUL, SDLoc(N), VT, N0.getOperand(0), Shl);
}
if (N1C && !N1C->isOpaque())