[llvm] [X86][NFC] Remove dead code for "_REV" instructions (PR #97828)

[Amir Ayupov via llvm-commits]

https://github.com/aaupov created https://github.com/llvm/llvm-project/pull/97828

Those "_REV" instructions should not appear before encoding
optimization, while macro fusion is done before encoding optimization.

Partial reland of 8bbf100799a97f8342bf1a8409c6fb48f03e837f

BOLT has dropped macro-op fusion alignment optimization in
https://github.com/llvm/llvm-project/pull/97358, which unblocks the
reland.


>From d0381d270f8bbe6c511af872a15fcb0fb06e01fa Mon Sep 17 00:00:00 2001
From: Amir Ayupov <aaupov at fb.com>
Date: Fri, 5 Jul 2024 07:30:12 -0700
Subject: [PATCH] [X86][NFC] Remove dead code for "_REV" instructions

Those "_REV" instructions should not appear before encoding
optimization, while macro fusion is done before encoding optimization.

Partial reland of 8bbf100799a97f8342bf1a8409c6fb48f03e837f

BOLT has dropped macro-op fusion alignment optimization in
https://github.com/llvm/llvm-project/pull/97358, which unblocks the
reland.
---
 llvm/lib/Target/X86/MCTargetDesc/X86BaseInfo.h | 16 ----------------
 1 file changed, 16 deletions(-)

diff --git a/llvm/lib/Target/X86/MCTargetDesc/X86BaseInfo.h b/llvm/lib/Target/X86/MCTargetDesc/X86BaseInfo.h
index a89408bb79b06..b24b8acce6412 100644
--- a/llvm/lib/Target/X86/MCTargetDesc/X86BaseInfo.h
+++ b/llvm/lib/Target/X86/MCTargetDesc/X86BaseInfo.h
@@ -150,25 +150,21 @@ classifyFirstOpcodeInMacroFusion(unsigned Opcode) {
   case X86::AND16ri8:
   case X86::AND16rm:
   case X86::AND16rr:
-  case X86::AND16rr_REV:
   case X86::AND32i32:
   case X86::AND32ri:
   case X86::AND32ri8:
   case X86::AND32rm:
   case X86::AND32rr:
-  case X86::AND32rr_REV:
   case X86::AND64i32:
   case X86::AND64ri32:
   case X86::AND64ri8:
   case X86::AND64rm:
   case X86::AND64rr:
-  case X86::AND64rr_REV:
   case X86::AND8i8:
   case X86::AND8ri:
   case X86::AND8ri8:
   case X86::AND8rm:
   case X86::AND8rr:
-  case X86::AND8rr_REV:
     return FirstMacroFusionInstKind::And;
   // CMP
   case X86::CMP16i16:
@@ -177,28 +173,24 @@ classifyFirstOpcodeInMacroFusion(unsigned Opcode) {
   case X86::CMP16ri8:
   case X86::CMP16rm:
   case X86::CMP16rr:
-  case X86::CMP16rr_REV:
   case X86::CMP32i32:
   case X86::CMP32mr:
   case X86::CMP32ri:
   case X86::CMP32ri8:
   case X86::CMP32rm:
   case X86::CMP32rr:
-  case X86::CMP32rr_REV:
   case X86::CMP64i32:
   case X86::CMP64mr:
   case X86::CMP64ri32:
   case X86::CMP64ri8:
   case X86::CMP64rm:
   case X86::CMP64rr:
-  case X86::CMP64rr_REV:
   case X86::CMP8i8:
   case X86::CMP8mr:
   case X86::CMP8ri:
   case X86::CMP8ri8:
   case X86::CMP8rm:
   case X86::CMP8rr:
-  case X86::CMP8rr_REV:
     return FirstMacroFusionInstKind::Cmp;
   // ADD
   case X86::ADD16i16:
@@ -206,50 +198,42 @@ classifyFirstOpcodeInMacroFusion(unsigned Opcode) {
   case X86::ADD16ri8:
   case X86::ADD16rm:
   case X86::ADD16rr:
-  case X86::ADD16rr_REV:
   case X86::ADD32i32:
   case X86::ADD32ri:
   case X86::ADD32ri8:
   case X86::ADD32rm:
   case X86::ADD32rr:
-  case X86::ADD32rr_REV:
   case X86::ADD64i32:
   case X86::ADD64ri32:
   case X86::ADD64ri8:
   case X86::ADD64rm:
   case X86::ADD64rr:
-  case X86::ADD64rr_REV:
   case X86::ADD8i8:
   case X86::ADD8ri:
   case X86::ADD8ri8:
   case X86::ADD8rm:
   case X86::ADD8rr:
-  case X86::ADD8rr_REV:
   // SUB
   case X86::SUB16i16:
   case X86::SUB16ri:
   case X86::SUB16ri8:
   case X86::SUB16rm:
   case X86::SUB16rr:
-  case X86::SUB16rr_REV:
   case X86::SUB32i32:
   case X86::SUB32ri:
   case X86::SUB32ri8:
   case X86::SUB32rm:
   case X86::SUB32rr:
-  case X86::SUB32rr_REV:
   case X86::SUB64i32:
   case X86::SUB64ri32:
   case X86::SUB64ri8:
   case X86::SUB64rm:
   case X86::SUB64rr:
-  case X86::SUB64rr_REV:
   case X86::SUB8i8:
   case X86::SUB8ri:
   case X86::SUB8ri8:
   case X86::SUB8rm:
   case X86::SUB8rr:
-  case X86::SUB8rr_REV:
     return FirstMacroFusionInstKind::AddSub;
   // INC
   case X86::INC16r: