[llvm] [CodeGen] [AMDGPU] Adds pre-commit test for fmul-select combine (PR #111107)

[Matt Arsenault via llvm-commits]

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@@ -0,0 +1,342 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+;RUN: llc < %s -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -verify-machineinstrs | FileCheck -check-prefix=GFX9 %s
+;RUN: llc < %s -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1030 -verify-machineinstrs | FileCheck -check-prefix=GFX1030 %s
+;RUN: llc < %s -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1100 -verify-machineinstrs | FileCheck -check-prefix=GFX1100 %s
+
+define float @fmul_select_f32_test1(float %x, i1 %bool) {
+; GFX9-LABEL: fmul_select_f32_test1:
+; GFX9:       ; %bb.0:
+; GFX9-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-NEXT:    v_and_b32_e32 v1, 1, v1
+; GFX9-NEXT:    v_cmp_eq_u32_e32 vcc, 1, v1
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arsenm wrote:

Better to have a real compare as the boolean test value, e.g. use an i32 arg and icmp eq %arg, 0. The non-boolean source i1 values are an edge case with more instructions 

https://github.com/llvm/llvm-project/pull/111107