mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-03 04:01:43 +08:00
73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
/* Raise given exceptions.
|
|
Copyright (C) 2000-2014 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com) and
|
|
Martin Schwidefsky (schwidefsky@de.ibm.com).
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <fenv_libc.h>
|
|
#include <float.h>
|
|
#include <math.h>
|
|
|
|
|
|
static __inline__ void
|
|
fexceptdiv (float d, float e)
|
|
{
|
|
__asm__ __volatile__ ("debr %0,%1" : : "f" (d), "f" (e) );
|
|
}
|
|
|
|
static __inline__ void
|
|
fexceptadd (float d, float e)
|
|
{
|
|
__asm__ __volatile__ ("aebr %0,%1" : : "f" (d), "f" (e) );
|
|
}
|
|
|
|
|
|
int
|
|
feraiseexcept (int excepts)
|
|
{
|
|
/* 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;
|
|
}
|
|
libm_hidden_def (feraiseexcept)
|