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AMDGPU: Preserve nuw in shl add ptr combine
authorMatt Arsenault <Matthew.Arsenault@amd.com>
Mon, 13 Nov 2017 05:33:35 +0000 (05:33 +0000)
committerMatt Arsenault <Matthew.Arsenault@amd.com>
Mon, 13 Nov 2017 05:33:35 +0000 (05:33 +0000)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@318017 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/AMDGPU/SIISelLowering.cpp

index 73cd697..0be8e81 100644 (file)
@@ -5229,7 +5229,12 @@ SDValue SITargetLowering::performSHLPtrCombine(SDNode *N,
   SDValue ShlX = DAG.getNode(ISD::SHL, SL, VT, N0.getOperand(0), N1);
   SDValue COffset = DAG.getConstant(Offset, SL, MVT::i32);
 
-  return DAG.getNode(ISD::ADD, SL, VT, ShlX, COffset);
+  SDNodeFlags Flags;
+  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,