[llvm] [ARM] Simplify LowerCMP (NFC) (PR #156198)

[via llvm-commits]

https://github.com/AZero13 created https://github.com/llvm/llvm-project/pull/156198

Pass the opcode directly.

>From 82dd83191b39fd9d81b8f0562e9116de7f1d5c2a Mon Sep 17 00:00:00 2001
From: AZero13 <gfunni234 at gmail.com>
Date: Sat, 30 Aug 2025 15:11:23 -0400
Subject: [PATCH] [ARM] Simplify LowerCMP (NFC)

Pass the opcode directly.
---
 llvm/lib/Target/ARM/ARMISelLowering.cpp | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/llvm/lib/Target/ARM/ARMISelLowering.cpp b/llvm/lib/Target/ARM/ARMISelLowering.cpp
index ea74d6a2071d9..147b710d6df43 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMISelLowering.cpp
@@ -10539,16 +10539,8 @@ SDValue ARMTargetLowering::LowerCMP(SDValue Op, SelectionDAG &DAG) const {
   }
 
   // Generate the operation with flags
-  SDValue OpWithFlags;
-  if (Opcode == ARMISD::ADDC) {
-    // Use ADDC: LHS + RHS (where RHS was 0 - X, now X)
-    OpWithFlags = DAG.getNode(ARMISD::ADDC, dl,
-                              DAG.getVTList(MVT::i32, FlagsVT), LHS, RHS);
-  } else {
-    // Use ARMISD::SUBC to generate SUBS instruction (subtract with flags)
-    OpWithFlags = DAG.getNode(ARMISD::SUBC, dl,
-                              DAG.getVTList(MVT::i32, FlagsVT), LHS, RHS);
-  }
+  SDValue OpWithFlags = DAG.getNode(Opcode, dl,
+                                    DAG.getVTList(MVT::i32, FlagsVT), LHS, RHS);
 
   SDValue OpResult = OpWithFlags.getValue(0); // The operation result
   SDValue Flags = OpWithFlags.getValue(1);    // The flags