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[DAG] Cleanup by folding some single use VT.getScalarSizeInBits() calls into its comparison. NFCI.

This commit is contained in:
Simon Pilgrim 2020-12-07 18:14:26 +00:00
parent 50dd1dba6e
commit b6e847c396
1 changed files with 5 additions and 10 deletions
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15
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -3400,12 +3400,10 @@ SDValue DAGCombiner::visitSUB(SDNode *N) {
if (N0.getOpcode() == ISD::XOR && N1.getOpcode() == ISD::SRA) {
SDValue X0 = N0.getOperand(0), X1 = N0.getOperand(1);
SDValue S0 = N1.getOperand(0);
if ((X0 == S0 && X1 == N1) || (X0 == N1 && X1 == S0)) {
unsigned OpSizeInBits = VT.getScalarSizeInBits();
if ((X0 == S0 && X1 == N1) || (X0 == N1 && X1 == S0))
if (ConstantSDNode *C = isConstOrConstSplat(N1.getOperand(1)))
if (C->getAPIntValue() == (OpSizeInBits - 1))
if (C->getAPIntValue() == (VT.getScalarSizeInBits() - 1))
return DAG.getNode(ISD::ABS, SDLoc(N), VT, S0);
}
}
}
@ -7683,12 +7681,10 @@ SDValue DAGCombiner::visitXOR(SDNode *N) {
if (A.getOpcode() == ISD::ADD && S.getOpcode() == ISD::SRA) {
SDValue A0 = A.getOperand(0), A1 = A.getOperand(1);
SDValue S0 = S.getOperand(0);
if ((A0 == S && A1 == S0) || (A1 == S && A0 == S0)) {
unsigned OpSizeInBits = VT.getScalarSizeInBits();
if ((A0 == S && A1 == S0) || (A1 == S && A0 == S0))
if (ConstantSDNode *C = isConstOrConstSplat(S.getOperand(1)))
if (C->getAPIntValue() == (OpSizeInBits - 1))
if (C->getAPIntValue() == (VT.getScalarSizeInBits() - 1))
return DAG.getNode(ISD::ABS, DL, VT, S0);
}
}
}
@ -21993,9 +21989,8 @@ SDValue DAGCombiner::BuildUDIV(SDNode *N) {
/// transform: LogBase2(V) = (EltBits - 1) - ctlz(V).
SDValue DAGCombiner::BuildLogBase2(SDValue V, const SDLoc &DL) {
EVT VT = V.getValueType();
unsigned EltBits = VT.getScalarSizeInBits();
SDValue Ctlz = DAG.getNode(ISD::CTLZ, DL, VT, V);
SDValue Base = DAG.getConstant(EltBits - 1, DL, VT);
SDValue Base = DAG.getConstant(VT.getScalarSizeInBits() - 1, DL, VT);
SDValue LogBase2 = DAG.getNode(ISD::SUB, DL, VT, Base, Ctlz);
return LogBase2;
}