From 4ac52cf0535e0b007b8a844292984a8f450f5fef Mon Sep 17 00:00:00 2001
From: JosJuice <josjuice@gmail.com>
Date: Sat, 20 Apr 2024 11:30:06 +0200
Subject: [PATCH] JitArm64: Minor mtfsfix optimization

BFI takes two cycles on many CPUs, whereas AND (immediate) only takes
one.
---
 Source/Core/Core/PowerPC/JitArm64/JitArm64_SystemRegisters.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Source/Core/Core/PowerPC/JitArm64/JitArm64_SystemRegisters.cpp b/Source/Core/Core/PowerPC/JitArm64/JitArm64_SystemRegisters.cpp
index fe61d9cd29..3cbd0e6de4 100644
--- a/Source/Core/Core/PowerPC/JitArm64/JitArm64_SystemRegisters.cpp
+++ b/Source/Core/Core/PowerPC/JitArm64/JitArm64_SystemRegisters.cpp
@@ -896,7 +896,8 @@ void JitArm64::mtfsfix(UGeckoInstruction inst)
   }
   else if (imm == 0x0)
   {
-    BFI(WA, ARM64Reg::WZR, shift, 4);
+    const u32 inverted_mask = ~mask;
+    AND(WA, WA, LogicalImm(inverted_mask, GPRSize::B32));
   }
   else
   {