clearfp.c File Reference

#include <precomp.h>

Include dependency graph for clearfp.c:

Go to the source code of this file.

Functions
unsigned int	_statusfp (void)
unsigned int CDECL	_clearfp (void)

Function Documentation

_clearfp()

unsigned int CDECL _clearfp

(

void

)

Definition at line 18 of file clearfp.c.

{
  unsigned int retVal = _statusfp();
#if defined(__GNUC__)
  __asm__ __volatile__( "fnclex" );
#else
  __asm fnclex;
#endif
  return retVal;
}

Referenced by main().

_statusfp()

unsigned int _statusfp

(

void

)

Definition at line 25 of file statfp.c.

{
  unsigned int retVal = 0;
  unsigned short fpword;

#ifdef _M_AMD64
    fpword = _mm_getcsr();
#elif defined(__GNUC__)
  __asm__ __volatile__( "fstsw %0" : "=m" (fpword) : );
#else // _MSC_VER
  __asm fstsw [fpword];
#endif
  if (fpword & 0x1)  retVal |= _SW_INVALID;
  if (fpword & 0x2)  retVal |= _SW_DENORMAL;
  if (fpword & 0x4)  retVal |= _SW_ZERODIVIDE;
  if (fpword & 0x8)  retVal |= _SW_OVERFLOW;
  if (fpword & 0x10) retVal |= _SW_UNDERFLOW;
  if (fpword & 0x20) retVal |= _SW_INEXACT;
  return retVal;
}

Referenced by _clearfp().