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AMDGPU: Preserve nuw in shl add ptr combine
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Authored by arsenm on Nov 6 2017, 7:34 AM.

Reviewers

rampitec

LGTM

This revision is now accepted and ready to land.Nov 6 2017, 10:23 AM

r318017

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Size

lib/

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AMDGPU/

8 lines

Show First 20 Lines • Show All 5,144 Lines • ▼ Show 20 Lines	SDValue SITargetLowering::performSHLPtrCombine(SDNode *N,

SelectionDAG &DAG = DCI.DAG;		SelectionDAG &DAG = DCI.DAG;
SDLoc SL(N);		SDLoc SL(N);
EVT VT = N->getValueType(0);		EVT VT = N->getValueType(0);

SDValue ShlX = DAG.getNode(ISD::SHL, SL, VT, N0.getOperand(0), N1);		SDValue ShlX = DAG.getNode(ISD::SHL, SL, VT, N0.getOperand(0), N1);
SDValue COffset = DAG.getConstant(Offset, SL, MVT::i32);		SDValue COffset = DAG.getConstant(Offset, SL, MVT::i32);

// XXX - Does this preserve NUW?		SDNodeFlags Flags;
return DAG.getNode(ISD::ADD, SL, VT, ShlX, COffset);		Flags.setNoUnsignedWrap(N->getFlags().hasNoUnsignedWrap() &&
		(N0.getOpcode() == ISD::OR \|\|
		N0->getFlags().hasNoUnsignedWrap()));

		return DAG.getNode(ISD::ADD, SL, VT, ShlX, COffset, Flags);
}		}

SDValue SITargetLowering::performMemSDNodeCombine(MemSDNode *N,		SDValue SITargetLowering::performMemSDNodeCombine(MemSDNode *N,
DAGCombinerInfo &DCI) const {		DAGCombinerInfo &DCI) const {
SDValue Ptr = N->getBasePtr();		SDValue Ptr = N->getBasePtr();
SelectionDAG &DAG = DCI.DAG;		SelectionDAG &DAG = DCI.DAG;
SDLoc SL(N);		SDLoc SL(N);

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