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Enable (sext x) == C --> x == (trunc C) combine

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Extend the existing code which handles this for zext. This makes this
more useful for targets with ZeroOrNegativeOne BooleanContent and
obsoletes a custom combine SI uses for i1 setcc (sext(i1), 0, setne)
since the constant will now be shrunk to i1.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224691 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault
2014-12-21 16:48:42 +00:00
parent b8f8f2dbed
commit d796cf2e01
5 changed files with 570 additions and 37 deletions
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23
lib/Target/R600/SIISelLowering.cpp
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@@ -1361,29 +1361,10 @@ SDValue SITargetLowering::PerformDAGCombine(SDNode *N,
DAGCombinerInfo &DCI) const {
SelectionDAG &DAG = DCI.DAG;
SDLoc DL(N);
EVT VT = N->getValueType(0);
switch (N->getOpcode()) {
default: return AMDGPUTargetLowering::PerformDAGCombine(N, DCI);
case ISD::SETCC: {
SDValue Arg0 = N->getOperand(0);
SDValue Arg1 = N->getOperand(1);
SDValue CC = N->getOperand(2);
ConstantSDNode * C = nullptr;
ISD::CondCode CCOp = dyn_cast<CondCodeSDNode>(CC)->get();
// i1 setcc (sext(i1), 0, setne) -> i1 setcc(i1, 0, setne)
if (VT == MVT::i1
&& Arg0.getOpcode() == ISD::SIGN_EXTEND
&& Arg0.getOperand(0).getValueType() == MVT::i1
&& (C = dyn_cast<ConstantSDNode>(Arg1))
&& C->isNullValue()
&& CCOp == ISD::SETNE) {
return SimplifySetCC(VT, Arg0.getOperand(0),
DAG.getConstant(0, MVT::i1), CCOp, true, DCI, DL);
}
break;
}
default:
return AMDGPUTargetLowering::PerformDAGCombine(N, DCI);
case ISD::FMAXNUM: // TODO: What about fmax_legacy?
case ISD::FMINNUM:
case AMDGPUISD::SMAX: