[llvm] [AMDGPU] Simplify and improve codegen for llvm.amdgcn.set.inactive (PR #107889)

[Jay Foad via llvm-commits]

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@@ -816,10 +816,7 @@ define amdgpu_kernel void @global_atomic_fadd_uni_address_div_value_agent_scope_
 ; GFX9-DPP-NEXT:    v_mbcnt_hi_u32_b32 v1, exec_hi, v1
 ; GFX9-DPP-NEXT:    s_or_saveexec_b64 s[0:1], -1
 ; GFX9-DPP-NEXT:    v_bfrev_b32_e32 v3, 1
-; GFX9-DPP-NEXT:    v_bfrev_b32_e32 v4, 1
-; GFX9-DPP-NEXT:    s_mov_b64 exec, s[0:1]
-; GFX9-DPP-NEXT:    v_mov_b32_e32 v4, v0
-; GFX9-DPP-NEXT:    s_mov_b64 exec, -1
+; GFX9-DPP-NEXT:    v_cndmask_b32_e64 v4, v3, v0, s[0:1]
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jayfoad wrote:

Nice improvement here.

https://github.com/llvm/llvm-project/pull/107889