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glibc  2.9
Functions
fraiseexcpt.c File Reference
#include <fenv_libc.h>
#include <float.h>
#include <math.h>

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Functions

static __inline__ void fexceptdiv (float d, float e)
static __inline__ void fexceptadd (float d, float e)
int feraiseexcept (int excepts)

Function Documentation

int feraiseexcept ( int  excepts)

Definition at line 41 of file fraiseexcpt.c.

{
  /* Raise exceptions represented by EXPECTS.  But we must raise only
     one signal at a time.  It is important that if the overflow/underflow
     exception and the inexact exception are given at the same time,
     the overflow/underflow exception follows the inexact exception.  */

  /* First: invalid exception.  */
  if (FE_INVALID & excepts)
    fexceptdiv (0.0, 0.0);

  /* Next: division by zero.  */
  if (FE_DIVBYZERO & excepts)
    fexceptdiv (1.0, 0.0);

  /* Next: overflow.  */
  if (FE_OVERFLOW & excepts)
    /* I don't think we can do the same trick as intel so we will have
       to live with inexact coming also.  */
    fexceptadd (FLT_MAX, 1.0e32);

  /* Next: underflow.  */
  if (FE_UNDERFLOW & excepts)
    fexceptdiv (FLT_MIN, 3.0);

  /* Last: inexact.  */
  if (FE_INEXACT & excepts)
    fexceptdiv (2.0, 3.0);

  /* Success.  */
  return 0;
}

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static __inline__ void fexceptadd ( float  d,
float  e 
) [static]

Definition at line 34 of file fraiseexcpt.c.

{
  __asm__ __volatile__ ("aebr %0,%1" : : "f" (d), "f" (e) );
}

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static __inline__ void fexceptdiv ( float  d,
float  e 
) [static]

Definition at line 28 of file fraiseexcpt.c.

{
  __asm__ __volatile__ ("debr %0,%1" : : "f" (d), "f" (e) );
}

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