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[DAGCombiner] Tidyup FMINNUM/FMAXNUM constant folding

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Enable constant folding for vector splats as well as scalars.

Enable constant canonicalization for all scalar and vector constants.

llvm-svn: 249978
This commit is contained in:
Simon Pilgrim 2015-10-11 16:02:28 +00:00
parent 1d1c56e2df
commit 5eac2607b9
1 changed files with 14 additions and 14 deletions
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28
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -9023,20 +9023,20 @@ SDValue DAGCombiner::visitFNEG(SDNode *N) {
SDValue DAGCombiner::visitFMINNUM(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
const ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
const ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1);
EVT VT = N->getValueType(0);
const ConstantFPSDNode *N0CFP = isConstOrConstSplatFP(N0);
const ConstantFPSDNode *N1CFP = isConstOrConstSplatFP(N1);
if (N0CFP && N1CFP) {
const APFloat &C0 = N0CFP->getValueAPF();
const APFloat &C1 = N1CFP->getValueAPF();
return DAG.getConstantFP(minnum(C0, C1), SDLoc(N), N->getValueType(0));
return DAG.getConstantFP(minnum(C0, C1), SDLoc(N), VT);
}
if (N0CFP) {
EVT VT = N->getValueType(0);
// Canonicalize to constant on RHS.
// Canonicalize to constant on RHS.
if (isConstantFPBuildVectorOrConstantFP(N0) &&
!isConstantFPBuildVectorOrConstantFP(N1))
return DAG.getNode(ISD::FMINNUM, SDLoc(N), VT, N1, N0);
}
return SDValue();
}
@ -9044,20 +9044,20 @@ SDValue DAGCombiner::visitFMINNUM(SDNode *N) {
SDValue DAGCombiner::visitFMAXNUM(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
const ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
const ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1);
EVT VT = N->getValueType(0);
const ConstantFPSDNode *N0CFP = isConstOrConstSplatFP(N0);
const ConstantFPSDNode *N1CFP = isConstOrConstSplatFP(N1);
if (N0CFP && N1CFP) {
const APFloat &C0 = N0CFP->getValueAPF();
const APFloat &C1 = N1CFP->getValueAPF();
return DAG.getConstantFP(maxnum(C0, C1), SDLoc(N), N->getValueType(0));
return DAG.getConstantFP(maxnum(C0, C1), SDLoc(N), VT);
}
if (N0CFP) {
EVT VT = N->getValueType(0);
// Canonicalize to constant on RHS.
// Canonicalize to constant on RHS.
if (isConstantFPBuildVectorOrConstantFP(N0) &&
!isConstantFPBuildVectorOrConstantFP(N1))
return DAG.getNode(ISD::FMAXNUM, SDLoc(N), VT, N1, N0);
}
return SDValue();
}