[llvm-branch-commits] [llvm] AMDGPU: Custom expand flat cmpxchg which may access private (PR #109410)

[Pierre van Houtryve via llvm-branch-commits]

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@@ -43,7 +43,7 @@ define i64 @test_flat_atomicrmw_sub_0_i64_agent(ptr %ptr) {
 ; ALL:       [[ATOMICRMW_PRIVATE]]:
 ; ALL-NEXT:    [[TMP1:%.*]] = addrspacecast ptr [[PTR]] to ptr addrspace(5)
 ; ALL-NEXT:    [[LOADED_PRIVATE:%.*]] = load i64, ptr addrspace(5) [[TMP1]], align 8
-; ALL-NEXT:    [[NEW:%.*]] = sub i64 [[LOADED_PRIVATE]], 0
+; ALL-NEXT:    [[NEW:%.*]] = add i64 [[LOADED_PRIVATE]], 0
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Pierre-vh wrote:

Why does this transform happen more often now?

https://github.com/llvm/llvm-project/pull/109410