[llvm] AMDGPU: Add codegen for atomicrmw operations usub_cond and usub_sat (PR #141068)

[via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -global-isel -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1030 < %s | FileCheck %s -check-prefix=GFX10-GISEL
+; RUN: llc -global-isel -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1031 < %s | FileCheck %s -check-prefix=GFX10-GISEL
+; RUN: llc -global-isel -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1100 < %s | FileCheck %s -check-prefix=GFX11-GISEL
+; RUN: llc -global-isel -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1200 < %s | FileCheck %s -check-prefix=GFX12-GISEL
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1030 < %s | FileCheck %s -check-prefix=GFX10-SDAG
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1031 < %s | FileCheck %s -check-prefix=GFX10-SDAG
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1100 < %s | FileCheck %s -check-prefix=GFX11-SDAG
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1200 < %s | FileCheck %s -check-prefix=GFX12-SDAG
+
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anjenner wrote:

Given that 122138 has not been merged yet shouldn't covering those scopes wait until it is? I'd like to avoid gating this change on that one, so perhaps opening an issue would be appropriate, or covering !amdgpu.no.remote.memory.access and !amdgpu.no.fine.grained.host.memory for usub_sat/usub_cond as part of https://github.com/llvm/llvm-project/pull/122138 .

https://github.com/llvm/llvm-project/pull/141068