From 3e1344e4e40f4b52ee62493d6725fcaf91ca9343 Mon Sep 17 00:00:00 2001
From: Nekotekina <nekotekina@gmail.com>
Date: Thu, 19 Nov 2020 13:21:07 +0300
Subject: [PATCH] vm.cpp: minor optimization for filling stack guards

Use REP STOSQ on all compilers.
---
 rpcs3/Emu/Memory/vm.cpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/rpcs3/Emu/Memory/vm.cpp b/rpcs3/Emu/Memory/vm.cpp
index d2b5e10769..2eadbb9936 100644
--- a/rpcs3/Emu/Memory/vm.cpp
+++ b/rpcs3/Emu/Memory/vm.cpp
@@ -1114,10 +1114,10 @@ namespace vm
 #ifdef _MSC_VER
 				__stosq(target, data, count);
 #else
-				for (std::size_t i = 0; i < count; i++)
-				{
-					target[i] = data;
-				}
+				__asm__ ("mov %0, %%rdi; mov %1, %%rax; mov %2, %%rcx; rep stosq;"
+					:
+					: "r" (ptr), "r" (data), "r" (count)
+					: "rdi", "rax", "rcx", "memory");
 #endif
 			};