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[DAGCombiner] improve formatting for select+setcc code; NFC 

llvm-svn: 342095
This commit is contained in:
Sanjay Patel 2018-09-12 23:03:50 +00:00
parent 9a45452987
commit 8a478b79dc
1 changed files with 15 additions and 17 deletions
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32
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -7307,27 +7307,25 @@ SDValue DAGCombiner::visitSELECT(SDNode *N) {
return DAG.getNode(ISD::SELECT, DL, VT, N0->getOperand(0), N2, N1);
}
// fold selects based on a setcc into other things, such as min/max/abs
// Fold selects based on a setcc into other things, such as min/max/abs.
if (N0.getOpcode() == ISD::SETCC) {
// select x, y (fcmp lt x, y) -> fminnum x, y
// select x, y (fcmp gt x, y) -> fmaxnum x, y
//
// This is OK if we don't care about what happens if either operand is a
// NaN.
//
if (N0.hasOneUse() && isLegalToCombineMinNumMaxNum(DAG, N1, N2)) {
ISD::CondCode CC = cast<CondCodeSDNode>(N0.getOperand(2))->get();
SDValue Cond0 = N0.getOperand(0), Cond1 = N0.getOperand(1);
ISD::CondCode CC = cast<CondCodeSDNode>(N0.getOperand(2))->get();
if (SDValue FMinMax = combineMinNumMaxNum(
DL, VT, N0.getOperand(0), N0.getOperand(1), N1, N2, CC, TLI, DAG))
// select (fcmp lt x, y), x, y -> fminnum x, y
// select (fcmp gt x, y), x, y -> fmaxnum x, y
//
// This is OK if we don't care what happens if either operand is a NaN.
if (N0.hasOneUse() && isLegalToCombineMinNumMaxNum(DAG, N1, N2))
if (SDValue FMinMax = combineMinNumMaxNum(DL, VT, Cond0, Cond1, N1, N2,
CC, TLI, DAG))
return FMinMax;
}
if ((!LegalOperations &&
TLI.isOperationLegalOrCustom(ISD::SELECT_CC, VT)) ||
TLI.isOperationLegal(ISD::SELECT_CC, VT))
return DAG.getNode(ISD::SELECT_CC, DL, VT, N0.getOperand(0),
N0.getOperand(1), N1, N2, N0.getOperand(2));
if (TLI.isOperationLegal(ISD::SELECT_CC, VT) ||
(!LegalOperations && TLI.isOperationLegalOrCustom(ISD::SELECT_CC, VT)))
return DAG.getNode(ISD::SELECT_CC, DL, VT, Cond0, Cond1, N1, N2,
N0.getOperand(2));
return SimplifySelect(DL, N0, N1, N2);
}