[llvm] [AMDGPU][SDAG] Legalise v2i32 or/xor/and instructions to make use of 64-bit wide instructions (PR #140694)

[Chris Jackson via llvm-commits]

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@@ -12872,6 +12919,46 @@ SDValue SITargetLowering::performOrCombine(SDNode *N,
     }
   }
 
+  // Detect identity v2i32 OR and replace with identity source node.
+  // Specifically an Or that has operands constructed from the same source node
+  // via extract_vector_elt and build_vector.
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chrisjbris wrote:

Thanks @arsenm , but by "any vector type" do you mean all vector widths and all vector element types, floating point and integer or any width?

https://github.com/llvm/llvm-project/pull/140694