diff --git a/Source/Core/Common/XSaveWorkaround.cpp b/Source/Core/Common/XSaveWorkaround.cpp index 30a2a42b2b..b54f33eb4b 100644 --- a/Source/Core/Common/XSaveWorkaround.cpp +++ b/Source/Core/Common/XSaveWorkaround.cpp @@ -2,39 +2,38 @@ // Licensed under GPLv2 // Refer to the license.txt file included. -#if defined(_WIN32) && defined(_ARCH_64) +#if defined(_WIN32) && defined(_M_X86_64) #include #include -// 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$XCB") - -struct EnableXSaveWorkaround +void EnableXSaveWorkaround() { - EnableXSaveWorkaround() - { - // Some Windows environments may have hardware support for AVX/FMA, - // but the OS does not support it. The CRT math library does not support - // this scenario, so we have to manually tell it not to use FMA3 - // instructions. + // Some Windows environments may have hardware support for AVX/FMA, + // but the OS does not support it. The CRT math library does not support + // this scenario, so we have to manually tell it not to use FMA3 + // instructions. - // The API name is somewhat misleading - we're testing for OS support - // here. - if (!IsProcessorFeaturePresent(PF_XSAVE_ENABLED)) - { - _set_FMA3_enable(0); - } + // The API name is somewhat misleading - we're testing for OS support + // here. + if (!IsProcessorFeaturePresent(PF_XSAVE_ENABLED)) + { + _set_FMA3_enable(0); } +} + +// Create a segment which is recognized by the linker to be part of the CRT +// initialization. XI* = C startup, XC* = C++ startup. "A" placement is reserved +// for system use. Thus, the earliest we can get is XIB (C startup is before +// C++). +#pragma section(".CRT$XIB", read) + +// Place a symbol in the special segment, make it have C linkage so that +// referencing it doesn't require ugly decorated names. +// Use /include:XSaveWorkaround linker flag to enable this. +extern "C" { + __declspec(allocate(".CRT$XIB")) + decltype(&EnableXSaveWorkaround) XSaveWorkaround = EnableXSaveWorkaround; }; -static EnableXSaveWorkaround enableXSaveWorkaround; - -// N.B. Any code after this will still be in the .CRT$XCB segment. Please just -// do not append any code here unless it is intended to be executed before -// static initializers. - #endif diff --git a/Source/VSProps/Base.props b/Source/VSProps/Base.props index d7c6019ce0..0d6fc8ae4f 100644 --- a/Source/VSProps/Base.props +++ b/Source/VSProps/Base.props @@ -106,6 +106,11 @@ true true + + + + XSaveWorkaround + true true