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31 lines
806 B
C
31 lines
806 B
C
/*
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* COPYRIGHT: See COPYING.LIB in the top level directory
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* PROJECT: ReactOS system libraries
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* PURPOSE: Resets FPU state to the default
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* PROGRAMER: Thomas Faber <thomas.faber@reactos.org>
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*/
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#include <precomp.h>
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/*********************************************************************
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* _fpreset (MSVCRT.@)
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*/
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void CDECL _fpreset(void)
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{
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const unsigned short x86_cw = 0x27f;
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#ifdef _MSC_VER
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__asm { fninit }
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__asm { fldcw [x86_cw] }
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#else
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__asm__ __volatile__( "fninit; fldcw %0" : : "m" (x86_cw) );
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#endif
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if (IsProcessorFeaturePresent(PF_XMMI64_INSTRUCTIONS_AVAILABLE))
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{
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const unsigned long sse2_cw = 0x1f80;
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#ifdef _MSC_VER
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__asm { ldmxcsr [sse2_cw] }
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#else
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__asm__ __volatile__( "ldmxcsr %0" : : "m" (sse2_cw) );
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#endif
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}
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}
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