dc/d8b/fpreset_8c_source.html

/*

 * COPYRIGHT:   See COPYING.LIB in the top level directory

 * PROJECT:     ReactOS system libraries

 * PURPOSE:     Resets FPU state to the default

 * PROGRAMER:   Thomas Faber <thomas.faber@reactos.org>

 */


#include <precomp.h>


/*********************************************************************

 *      _fpreset (MSVCRT.@)

 */

void CDECL _fpreset(void)

{

    const unsigned short x86_cw = 0x27f;

#ifdef _MSC_VER

    __asm { fninit }

    __asm { fldcw [x86_cw] }

#else

    __asm__ __volatile__( "fninit; fldcw %0" : : "m" (x86_cw) );

#endif

    if (IsProcessorFeaturePresent(PF_XMMI64_INSTRUCTIONS_AVAILABLE))

    {

          const unsigned long sse2_cw = 0x1f80;

#ifdef _MSC_VER

        __asm { ldmxcsr [sse2_cw] }

#else

        __asm__ __volatile__( "ldmxcsr %0" : : "m" (sse2_cw) );

#endif

    }

}

CDECL
#define CDECL
Definition: compat.h:29

IsProcessorFeaturePresent
BOOL WINAPI IsProcessorFeaturePresent(IN DWORD ProcessorFeature)
Definition: sysinfo.c:169

_fpreset
void CDECL _fpreset(void)
Definition: fpreset.c:13

__asm__
__asm__(".p2align 4, 0x90\n" ".seh_proc __seh2_global_filter_func\n" "__seh2_global_filter_func:\n" "\tsub %rbp, %rax\n" "\tpush %rbp\n" "\t.seh_pushreg %rbp\n" "\tsub $32, %rsp\n" "\t.seh_stackalloc 32\n" "\t.seh_endprologue\n" "\tsub %rax, %rdx\n" "\tmov %rdx, %rbp\n" "\tjmp *%r8\n" "__seh2_global_filter_func_exit:\n" "\t.p2align 4\n" "\tadd $32, %rsp\n" "\tpop %rbp\n" "\tret\n" "\t.seh_endproc")

PF_XMMI64_INSTRUCTIONS_AVAILABLE
#define PF_XMMI64_INSTRUCTIONS_AVAILABLE
Definition: ketypes.h:134