From c817b4779daf6b58a25bfb194a156e3215177574 Mon Sep 17 00:00:00 2001
From: Sintendo <3380580+Sintendo@users.noreply.github.com>
Date: Sat, 28 Dec 2024 23:20:17 +0100
Subject: [PATCH] JitArm64_Integer: addzex - Optimize InPPCState case for 0

Before:
0x52800019   mov    w25, #0x0                 ; =0
0x394bd3b8   ldrb   w24, [x29, #0x2f4]
0x2b180339   adds   w25, w25, w24

After:
0x394bd3b9   ldrb   w25, [x29, #0x2f4]
---
 Source/Core/Core/PowerPC/JitArm64/JitArm64_Integer.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Source/Core/Core/PowerPC/JitArm64/JitArm64_Integer.cpp b/Source/Core/Core/PowerPC/JitArm64/JitArm64_Integer.cpp
index c3ebc252e4..0b21cc2d9d 100644
--- a/Source/Core/Core/PowerPC/JitArm64/JitArm64_Integer.cpp
+++ b/Source/Core/Core/PowerPC/JitArm64/JitArm64_Integer.cpp
@@ -1129,13 +1129,21 @@ void JitArm64::addzex(UGeckoInstruction inst)
 
   int a = inst.RA, d = inst.RD;
 
-  if (gpr.IsImm(a) && HasConstantCarry())
+  if (gpr.IsImm(a) &&
+      (HasConstantCarry() || (js.carryFlag == CarryFlag::InPPCState && gpr.GetImm(a) == 0)))
   {
     const u32 imm = gpr.GetImm(a);
     const bool is_all_ones = imm == 0xFFFFFFFF;
 
     switch (js.carryFlag)
     {
+    case CarryFlag::InPPCState:
+    {
+      gpr.BindToRegister(d, false);
+      LDRB(IndexType::Unsigned, gpr.R(d), PPC_REG, PPCSTATE_OFF(xer_ca));
+      ComputeCarry(false);
+      break;
+    }
     case CarryFlag::ConstantTrue:
     {
       gpr.SetImmediate(d, imm + 1);