[llvm-branch-commits] [llvm] [AMDGPU][SDAG] Handle ISD::PTRADD in various special cases (PR #145330)

[Matt Arsenault via llvm-branch-commits]

================
@@ -615,8 +615,14 @@ bool TargetLowering::ShrinkDemandedOp(SDValue Op, unsigned 
BitWidth,
       // operands on the new node are also disjoint.
       SDNodeFlags Flags(Op->getFlags().hasDisjoint() ? SDNodeFlags::Disjoint
                                                      : SDNodeFlags::None);
+      unsigned Opcode = Op.getOpcode();
+      if (Opcode == ISD::PTRADD) {
+        // It isn't a ptradd anymore if it doesn't operate on the entire
+        // pointer.
----------------
arsenm wrote:

This is a bit surprising but I suppose it's a consequence of not actually 
having pointer types, which would imply an additional operation is needed 

https://github.com/llvm/llvm-project/pull/145330
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