From 05f3f077047daeef64a6bac67af05fba305bc7a3 Mon Sep 17 00:00:00 2001
From: MerryMage <MerryMage@users.noreply.github.com>
Date: Mon, 4 Dec 2017 17:52:38 +0000
Subject: [PATCH] emit_x64: Reduce mxscr operations in EmitGetFpscr and
 EmitSetFpscr

---
 src/backend_x64/emit_x64.cpp | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/backend_x64/emit_x64.cpp b/src/backend_x64/emit_x64.cpp
index d40876e0..a070d6a3 100644
--- a/src/backend_x64/emit_x64.cpp
+++ b/src/backend_x64/emit_x64.cpp
@@ -449,9 +449,8 @@ void EmitX64::EmitGetFpscr(RegAlloc& reg_alloc, IR::Block&, IR::Inst* inst) {
     reg_alloc.HostCall(inst);
     code->mov(code->ABI_PARAM1, code->r15);
 
-    code->SwitchMxcsrOnExit();
+    code->stmxcsr(code->dword[code->r15 + offsetof(JitState, guest_MXCSR)]);
     code->CallFunction(&GetFpscrImpl);
-    code->SwitchMxcsrOnEntry();
 }
 
 static void SetFpscrImpl(u32 value, JitState* jit_state) {
@@ -463,9 +462,8 @@ void EmitX64::EmitSetFpscr(RegAlloc& reg_alloc, IR::Block&, IR::Inst* inst) {
     reg_alloc.HostCall(nullptr, args[0]);
     code->mov(code->ABI_PARAM2, code->r15);
 
-    code->SwitchMxcsrOnExit();
     code->CallFunction(&SetFpscrImpl);
-    code->SwitchMxcsrOnEntry();
+    code->ldmxcsr(code->dword[code->r15 + offsetof(JitState, guest_MXCSR)]);
 }
 
 void EmitX64::EmitGetFpscrNZCV(RegAlloc& reg_alloc, IR::Block&, IR::Inst* inst) {