From 8995d299f22c25eb540f3a28c3b2492ec2059b0d Mon Sep 17 00:00:00 2001
From: Shawn Hoffman <godisgovernment@gmail.com>
Date: Thu, 6 Mar 2014 14:37:40 -0800
Subject: [PATCH 1/2] windows: move arch defines to base.props

---
 Source/Core/Common/Common.h | 14 --------------
 Source/VSProps/Base.props   |  4 +++-
 2 files changed, 3 insertions(+), 15 deletions(-)

diff --git a/Source/Core/Common/Common.h b/Source/Core/Common/Common.h
index 6b1a50b8d3..1f600926ff 100644
--- a/Source/Core/Common/Common.h
+++ b/Source/Core/Common/Common.h
@@ -101,20 +101,6 @@ private:
 
 #endif
 
-// Architecture detection for Windows
-// Architecture detection is done in cmake on all other platforms
-// Windows is built on only x86/x86_64
-#if _WIN32 || _WIN64
-#define _M_X86 1
-#if _WIN64
-#define _ARCH_64 1
-#define _M_X86_64 1
-#else
-#define _ARCH_32 1
-#define _M_X86_32 1
-#endif
-#endif
-
 // Windows compatibility
 #ifndef _WIN32
 #include <limits.h>
diff --git a/Source/VSProps/Base.props b/Source/VSProps/Base.props
index 36fe12a6ea..d7c6019ce0 100644
--- a/Source/VSProps/Base.props
+++ b/Source/VSProps/Base.props
@@ -57,7 +57,9 @@
       <RuntimeTypeInfo>false</RuntimeTypeInfo>
       <MinimalRebuild>false</MinimalRebuild>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
-      <AdditionalOptions>/d2Zi+ /volatile:iso  /D PSAPI_VERSION=1 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions>/d2Zi+ /volatile:iso /D PSAPI_VERSION=1 /D _M_X86=1 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Platform)'=='Win32'">/D _ARCH_32=1 /D _M_X86_32=1 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Platform)'=='x64'">/D _ARCH_64=1 /D _M_X86_64=1 %(AdditionalOptions)</AdditionalOptions>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <!--
       This is for GetVersionEx being marked as depreciated - which is idiotic and there's

From 932945d4808e37ba0ca1a953571187f445e24f41 Mon Sep 17 00:00:00 2001
From: Shawn Hoffman <godisgovernment@gmail.com>
Date: Thu, 6 Mar 2014 14:38:10 -0800
Subject: [PATCH 2/2] Implement workaround for Windows versions which do not
 support XSAVE.

Fixes CRT math routines using FMA instructions from causing illegal instructions.
---
 Source/Core/Common/Common.vcxproj         |  1 +
 Source/Core/Common/Common.vcxproj.filters |  1 +
 Source/Core/Common/XSaveWorkaround.cpp    | 40 +++++++++++++++++++++++
 3 files changed, 42 insertions(+)
 create mode 100644 Source/Core/Common/XSaveWorkaround.cpp

diff --git a/Source/Core/Common/Common.vcxproj b/Source/Core/Common/Common.vcxproj
index 48cbcdfe3c..2aa69ba1b7 100644
--- a/Source/Core/Common/Common.vcxproj
+++ b/Source/Core/Common/Common.vcxproj
@@ -125,6 +125,7 @@
     <ClCompile Include="x64CPUDetect.cpp" />
     <ClCompile Include="x64Emitter.cpp" />
     <ClCompile Include="x64FPURoundMode.cpp" />
+    <ClCompile Include="XSaveWorkaround.cpp" />
   </ItemGroup>
   <ItemGroup>
     <Text Include="CMakeLists.txt" />
diff --git a/Source/Core/Common/Common.vcxproj.filters b/Source/Core/Common/Common.vcxproj.filters
index f2b194c007..d932b32be5 100644
--- a/Source/Core/Common/Common.vcxproj.filters
+++ b/Source/Core/Common/Common.vcxproj.filters
@@ -103,6 +103,7 @@
       <Filter>Logging</Filter>
     </ClCompile>
     <ClCompile Include="stdafx.cpp" />
+    <ClCompile Include="XSaveWorkaround.cpp" />
   </ItemGroup>
   <ItemGroup>
     <Text Include="CMakeLists.txt" />
diff --git a/Source/Core/Common/XSaveWorkaround.cpp b/Source/Core/Common/XSaveWorkaround.cpp
new file mode 100644
index 0000000000..30a2a42b2b
--- /dev/null
+++ b/Source/Core/Common/XSaveWorkaround.cpp
@@ -0,0 +1,40 @@
+// Copyright 2013 Dolphin Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#if defined(_WIN32) && defined(_ARCH_64)
+
+#include <math.h>
+#include <Windows.h>
+
+// This puts the rest of this translation unit into a segment which is
+// initialized by the CRT *before* any of the other code (including C++
+// static initializers).
+#pragma warning(disable : 4075)
+#pragma init_seg(".CRT$XCB")
+
+struct EnableXSaveWorkaround
+{
+	EnableXSaveWorkaround()
+	{
+		// Some Windows environments may have hardware support for AVX/FMA,
+		// but the OS does not support it. The CRT math library does not support
+		// this scenario, so we have to manually tell it not to use FMA3
+		// instructions.
+
+		// The API name is somewhat misleading - we're testing for OS support
+		// here.
+		if (!IsProcessorFeaturePresent(PF_XSAVE_ENABLED))
+		{
+			_set_FMA3_enable(0);
+		}
+	}
+};
+
+static EnableXSaveWorkaround enableXSaveWorkaround;
+
+// N.B. Any code after this will still be in the .CRT$XCB segment. Please just
+// do not append any code here unless it is intended to be executed before
+// static initializers.
+
+#endif