[llvm] added isCommutable attribute to V_ADD_NC_U16 (PR #111789)

[via llvm-commits]

https://github.com/easyonaadit created https://github.com/llvm/llvm-project/pull/111789

None

>From 0f38c4defe03b3fb00b4fade0d37975219389b6d Mon Sep 17 00:00:00 2001
From: easyonaadit <aaditya.alokdeshpande at amd.com>
Date: Mon, 7 Oct 2024 12:03:22 +0530
Subject: [PATCH] added isCommutable attribute to V_ADD_NC_U16

---
 llvm/lib/Target/AMDGPU/VOP3Instructions.td | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/llvm/lib/Target/AMDGPU/VOP3Instructions.td b/llvm/lib/Target/AMDGPU/VOP3Instructions.td
index 78ca7a2f258cb3..69a7a77f5ee8eb 100644
--- a/llvm/lib/Target/AMDGPU/VOP3Instructions.td
+++ b/llvm/lib/Target/AMDGPU/VOP3Instructions.td
@@ -870,9 +870,11 @@ let SubtargetPredicate = isGFX10Plus in {
     def : PermlanePat<int_amdgcn_permlane16, V_PERMLANE16_B32_e64, vt>;
     def : PermlanePat<int_amdgcn_permlanex16, V_PERMLANEX16_B32_e64, vt>;
   }
-
-  defm V_ADD_NC_U16 : VOP3Inst <"v_add_nc_u16", VOP3_Profile<VOP_I16_I16_I16, VOP3_OPSEL>, add>;
-  defm V_SUB_NC_U16 : VOP3Inst <"v_sub_nc_u16", VOP3_Profile<VOP_I16_I16_I16, VOP3_OPSEL>, sub>;
+  
+  let isCommutable = 1 in {
+    defm V_ADD_NC_U16 : VOP3Inst <"v_add_nc_u16", VOP3_Profile<VOP_I16_I16_I16, VOP3_OPSEL>, add>;
+    defm V_SUB_NC_U16 : VOP3Inst <"v_sub_nc_u16", VOP3_Profile<VOP_I16_I16_I16, VOP3_OPSEL>, sub>;
+  } // End isCommutable = 1
 
   def : OpSelBinOpClampPat<uaddsat, V_ADD_NC_U16_e64>;
   def : OpSelBinOpClampPat<usubsat, V_SUB_NC_U16_e64>;