[llvm] 303e648 - [X86][NFC] Remove dead code for "_REV" instructions

[Shengchen Kan via llvm-commits]

Author: Shengchen Kan
Date: 2024-01-24T17:26:57+08:00
New Revision: 303e64826b79af0c0e67ba06d5d8e1385adc32b5

URL: https://github.com/llvm/llvm-project/commit/303e64826b79af0c0e67ba06d5d8e1385adc32b5
DIFF: https://github.com/llvm/llvm-project/commit/303e64826b79af0c0e67ba06d5d8e1385adc32b5.diff

LOG: [X86][NFC] Remove dead code for "_REV" instructions

ADC/SBB with reverse encoding is never emitted by compiler before
encoding optimization, which is called after flag-copy lowering.

This is a partial reland for 8bbf100799a97f8342bf1a8409c6fb48f03e837f

Added: 
    

Modified: 
    llvm/lib/Target/X86/X86FlagsCopyLowering.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Target/X86/X86FlagsCopyLowering.cpp b/llvm/lib/Target/X86/X86FlagsCopyLowering.cpp
index b13bf361ab79b5d..aad839b83ee194e 100644
--- a/llvm/lib/Target/X86/X86FlagsCopyLowering.cpp
+++ b/llvm/lib/Target/X86/X86FlagsCopyLowering.cpp
@@ -173,7 +173,6 @@ static FlagArithMnemonic getMnemonicFromOpcode(unsigned Opcode) {
 
 #define LLVM_EXPAND_ADC_SBB_INSTR(MNEMONIC)                                    \
   LLVM_EXPAND_INSTR_SIZES(MNEMONIC, rr)                                        \
-  LLVM_EXPAND_INSTR_SIZES(MNEMONIC, rr_REV)                                    \
   LLVM_EXPAND_INSTR_SIZES(MNEMONIC, rm)                                        \
   LLVM_EXPAND_INSTR_SIZES(MNEMONIC, mr)                                        \
   case X86::MNEMONIC##8ri:                                                     \