forked from dolphin-emu/dolphin
41 lines
1.1 KiB
C++
41 lines
1.1 KiB
C++
// Copyright 2013 Dolphin Emulator Project
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// Licensed under GPLv2
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// Refer to the license.txt file included.
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#if defined(_WIN32) && defined(_ARCH_64)
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#include <math.h>
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#include <Windows.h>
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// This puts the rest of this translation unit into a segment which is
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// initialized by the CRT *before* any of the other code (including C++
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// static initializers).
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#pragma warning(disable : 4075)
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#pragma init_seg(".CRT$XCB")
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struct EnableXSaveWorkaround
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{
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EnableXSaveWorkaround()
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{
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// Some Windows environments may have hardware support for AVX/FMA,
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// but the OS does not support it. The CRT math library does not support
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// this scenario, so we have to manually tell it not to use FMA3
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// instructions.
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// The API name is somewhat misleading - we're testing for OS support
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// here.
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if (!IsProcessorFeaturePresent(PF_XSAVE_ENABLED))
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{
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_set_FMA3_enable(0);
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}
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}
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};
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static EnableXSaveWorkaround enableXSaveWorkaround;
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// N.B. Any code after this will still be in the .CRT$XCB segment. Please just
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// do not append any code here unless it is intended to be executed before
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// static initializers.
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#endif
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