[llvm] AMDGPU: Add an argument to DS_Real_gfx12 to disable alias, NFC (PR #84717)

[Changpeng Fang via llvm-commits]

https://github.com/changpeng created https://github.com/llvm/llvm-project/pull/84717

  This is for cased that we simply want to rename from ps.Mnemonic, but ps.Mnemonic itself is not supported as an alias.

>From cc64e8850c8242ebb14db1fd5d592c91c11b5208 Mon Sep 17 00:00:00 2001
From: Changpeng Fang <changpeng.fang at amd.com>
Date: Sun, 10 Mar 2024 21:33:37 -0700
Subject: [PATCH] AMDGPU: Add an argument to DS_Real_gfx12 to disable alias,
 NFC

  This is for cased that we simply want to rename from ps.Mnemonic,
but ps.Mnemonic itself is not supported as an alias.
---
 llvm/lib/Target/AMDGPU/DSInstructions.td | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Target/AMDGPU/DSInstructions.td b/llvm/lib/Target/AMDGPU/DSInstructions.td
index a84227ebf506fe..2a02d7f95b3c8c 100644
--- a/llvm/lib/Target/AMDGPU/DSInstructions.td
+++ b/llvm/lib/Target/AMDGPU/DSInstructions.td
@@ -1210,13 +1210,13 @@ class Base_DS_Real_gfx6_gfx7_gfx10_gfx11_gfx12<bits<8> op, DS_Pseudo ps, int ef,
 // GFX12.
 //===----------------------------------------------------------------------===//
 
-multiclass DS_Real_gfx12<bits<8> op, string name = !tolower(NAME)> {
+multiclass DS_Real_gfx12<bits<8> op, string name = !tolower(NAME), int needAlias = true> {
   defvar ps = !cast<DS_Pseudo>(NAME);
   let AssemblerPredicate = isGFX12Plus, DecoderNamespace = "GFX12" in
     def _gfx12 :
       Base_DS_Real_gfx6_gfx7_gfx10_gfx11_gfx12<op, ps, SIEncodingFamily.GFX12,
                                                name, /*hasGDS=*/false>;
-  if !ne(ps.Mnemonic, name) then
+  if !and(needAlias, !ne(ps.Mnemonic, name)) then
     def : MnemonicAlias<ps.Mnemonic, name>, Requires<[isGFX12Plus]>;
 }