[AMDGPU] New test case where we should not form FMA

llvm · Jun 1, 2023 · 9290199 · 9290199
1 parent 0213c6d
commit 9290199
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/llvm/test/CodeGen/AMDGPU/dagcombine-fma-fmad.ll b/llvm/test/CodeGen/AMDGPU/dagcombine-fma-fmad.ll
@@ -274,6 +274,18 @@ define amdgpu_ps float @fma_vs_output_modifier(float %x, i32 %n) #0 {
   ret float %r
 }
 
+define amdgpu_ps float @fma_vs_output_modifier_2(float %x) #0 {
+; GCN-LABEL: fma_vs_output_modifier_2:
+; GCN:       ; %bb.0:
+; GCN-NEXT:    v_mul_f32_e32 v1, v0, v0
+; GCN-NEXT:    v_fmac_f32_e32 v1, v0, v0
+; GCN-NEXT:    v_mov_b32_e32 v0, v1
+; GCN-NEXT:    ; return to shader part epilog
+  %m = fmul contract float %x, %x
+  %a = fadd nsz contract float %m, %m
+  ret float %a
+}
+
 ; Function Attrs: nofree nosync nounwind readnone speculatable willreturn
 declare float @llvm.maxnum.f32(float, float) #1