[llvm] [AMDGPU][SDAG] Initial support for ISD::PTRADD (PR #141725)

[Matt Arsenault via llvm-commits]

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@@ -10419,6 +10426,11 @@ SDValue SITargetLowering::LowerINTRINSIC_VOID(SDValue Op,
   }
 }
 
+bool SITargetLowering::shouldPreservePtrArith(const Function &F,
+                                              EVT PtrVT) const {
+  return UseSelectionDAGPTRADD;
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arsenm wrote:

Since the only case you care about is the 64-bit flat case, you could split this and only handle 64-bit pointers initially 

https://github.com/llvm/llvm-project/pull/141725