[llvm] [AMDGPU] Add commute for some VOP3 inst (PR #121326)

[Matt Arsenault via llvm-commits]

================
@@ -15,13 +15,45 @@ body: |
 ...
 
 ---
-name: test_machine_cse_op_inline_const
+name: test_machine_cse_op_const_v_add_nc_u16
 body: |
-  ; GCN-LABEL: name: test_machine_cse_op_inline_const
+  ; GCN-LABEL: name: test_machine_cse_op_const_v_add_nc_u16
   ; GCN: %0:vgpr_32 = V_ADD_NC_U16_e64 0, 64, 0, -3, 1, 0, implicit $mode, implicit $exec
   ; GCN-NEXT: DS_WRITE2_B32_gfx9 undef %2:vgpr_32, %0, %0, 0, 1, 0, implicit $exec
   bb.0:
     %1:vgpr_32 = V_ADD_NC_U16_e64 0, 64, 0, -3, 1, 0, implicit $mode, implicit $exec
     %2:vgpr_32 = V_ADD_NC_U16_e64 0, -3, 0, 64, 1, 0, implicit $mode, implicit $exec
     DS_WRITE2_B32_gfx9 undef %4:vgpr_32, %1, %2, 0, 1, 0, implicit $exec
 ...
+
+---
+name: test_machine_cse_op_v_fma_f16
+tracksRegLiveness: true
+body:             |
+  ; GCN-LABEL: name: test_machine_cse_op_v_fma_f16
+  ; GCN: %3:vgpr_32 = nofpexcept V_FMA_F16_e64 0, %0, 0, %1, 0, %2, 0, 0, implicit $mode, implicit $exec
+  ; GCN-NEXT: DS_WRITE2_B32_gfx9 undef %5:vgpr_32, %3, %3, 0, 1, 0, implicit $exec
+  bb.0:
+    liveins: $vgpr0, $vgpr1, $vgpr2
+    %0:vgpr_32 = COPY $vgpr0
+    %1:vgpr_32 = COPY $vgpr1
+    %2:vgpr_32 = COPY $vgpr2
+    %3:vgpr_32 = nofpexcept V_FMA_F16_e64 0, %0, 0, %1, 0, %2, 0, 0, implicit $mode, implicit $exec
+    %4:vgpr_32 = nofpexcept V_FMA_F16_e64 0, %1, 0, %0, 0, %2, 0, 0, implicit $mode, implicit $exec
+    DS_WRITE2_B32_gfx9 undef %5:vgpr_32, %3, %4, 0, 1, 0, implicit $exec
+...
+
+---
+name: test_machine_cse_op_const_v_fma_f16
+tracksRegLiveness: true
+body:             |
+  ; GCN-LABEL: name: test_machine_cse_op_const_v_fma_f16
+  ; GCN: %1:vgpr_32 = nofpexcept V_FMA_F16_e64 0, 3481272320, 0, 1, 0, %0, 0, 0, implicit $mode, implicit $exec
+  ; GCN-NEXT: DS_WRITE2_B32_gfx9 undef %3:vgpr_32, %1, %1, 0, 1, 0, implicit $exec
+  bb.0:
+    liveins: $vgpr0, $vgpr1, $vgpr2
+    %0:vgpr_32 = COPY $vgpr0
+    %1:vgpr_32 = nofpexcept V_FMA_F16_e64 0, 1, 0, 3481272320, 0, %0, 0, 0, implicit $mode, implicit $exec
+    %2:vgpr_32 = nofpexcept V_FMA_F16_e64 0, 3481272320, 0, 1, 0, %0, 0, 0, implicit $mode, implicit $exec
+    DS_WRITE2_B32_gfx9 undef %3:vgpr_32, %1, %2, 0, 1, 0, implicit $exec
+...
----------------
arsenm wrote:

Test the src0X cases? I'm not familiar with those 

https://github.com/llvm/llvm-project/pull/121326