[llvm] [GlobalIsel] Combine zext of trunc (episode II) (PR #108305)

[Matt Arsenault via llvm-commits]

Thorsten =?utf-8?q?Schütt?= <schuett at gmail.com>,
Thorsten =?utf-8?q?Schütt?= <schuett at gmail.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/108305 at github.com>


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@@ -65,16 +68,19 @@ exit:
 define amdgpu_ps void @divergent_i1_phi_uniform_branch_simple(ptr addrspace(1) %out, i32 %tid, i32 inreg %cond) {
 ; GFX10-LABEL: divergent_i1_phi_uniform_branch_simple:
 ; GFX10:       ; %bb.0: ; %A
-; GFX10-NEXT:    v_cmp_le_u32_e64 s1, 6, v2
 ; GFX10-NEXT:    s_cmp_lg_u32 s0, 0
+; GFX10-NEXT:    v_cmp_le_u32_e64 s0, 6, v2
+; GFX10-NEXT:    s_cselect_b32 s1, 1, 0
+; GFX10-NEXT:    s_and_b32 s1, s1, 1
+; GFX10-NEXT:    s_cmp_lg_u32 s1, 0
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arsenm wrote:

What happened here? 

https://github.com/llvm/llvm-project/pull/108305