mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
124 lines
3.8 KiB
C
124 lines
3.8 KiB
C
/* Raise given exceptions.
|
|
Copyright (C) 1997-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <fenv.h>
|
|
#include <math.h>
|
|
|
|
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) != 0)
|
|
{
|
|
/* One example of an invalid operation is 0.0 / 0.0. */
|
|
double d;
|
|
__asm__ __volatile__ ("fldz; fdiv %%st, %%st(0); fwait" : "=t" (d));
|
|
(void) &d;
|
|
}
|
|
|
|
/* Next: division by zero. */
|
|
if ((FE_DIVBYZERO & excepts) != 0)
|
|
{
|
|
double d;
|
|
__asm__ __volatile__ ("fldz; fld1; fdivp %%st, %%st(1); fwait"
|
|
: "=t" (d));
|
|
(void) &d;
|
|
}
|
|
|
|
/* Next: overflow. */
|
|
if ((FE_OVERFLOW & excepts) != 0)
|
|
{
|
|
/* There is no way to raise only the overflow flag. Do it the
|
|
hard way. */
|
|
fenv_t temp;
|
|
|
|
/* Bah, we have to clear selected exceptions. Since there is no
|
|
`fldsw' instruction we have to do it the hard way. */
|
|
__asm__ __volatile__ ("fnstenv %0" : "=m" (*&temp));
|
|
|
|
/* Set the relevant bits. */
|
|
temp.__status_word |= FE_OVERFLOW;
|
|
|
|
/* Put the new data in effect. */
|
|
__asm__ __volatile__ ("fldenv %0" : : "m" (*&temp));
|
|
|
|
/* And raise the exception. */
|
|
__asm__ __volatile__ ("fwait");
|
|
}
|
|
|
|
/* Next: underflow. */
|
|
if ((FE_UNDERFLOW & excepts) != 0)
|
|
{
|
|
/* There is no way to raise only the underflow flag. Do it the
|
|
hard way. */
|
|
fenv_t temp;
|
|
|
|
/* Bah, we have to clear selected exceptions. Since there is no
|
|
`fldsw' instruction we have to do it the hard way. */
|
|
__asm__ __volatile__ ("fnstenv %0" : "=m" (*&temp));
|
|
|
|
/* Set the relevant bits. */
|
|
temp.__status_word |= FE_UNDERFLOW;
|
|
|
|
/* Put the new data in effect. */
|
|
__asm__ __volatile__ ("fldenv %0" : : "m" (*&temp));
|
|
|
|
/* And raise the exception. */
|
|
__asm__ __volatile__ ("fwait");
|
|
}
|
|
|
|
/* Last: inexact. */
|
|
if ((FE_INEXACT & excepts) != 0)
|
|
{
|
|
/* There is no way to raise only the inexact flag. Do it the
|
|
hard way. */
|
|
fenv_t temp;
|
|
|
|
/* Bah, we have to clear selected exceptions. Since there is no
|
|
`fldsw' instruction we have to do it the hard way. */
|
|
__asm__ __volatile__ ("fnstenv %0" : "=m" (*&temp));
|
|
|
|
/* Set the relevant bits. */
|
|
temp.__status_word |= FE_INEXACT;
|
|
|
|
/* Put the new data in effect. */
|
|
__asm__ __volatile__ ("fldenv %0" : : "m" (*&temp));
|
|
|
|
/* And raise the exception. */
|
|
__asm__ __volatile__ ("fwait");
|
|
}
|
|
|
|
/* Success. */
|
|
return 0;
|
|
}
|
|
|
|
#include <shlib-compat.h>
|
|
#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
|
|
strong_alias (__feraiseexcept, __old_feraiseexcept)
|
|
compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1);
|
|
#endif
|
|
|
|
libm_hidden_def (__feraiseexcept)
|
|
libm_hidden_ver (__feraiseexcept, feraiseexcept)
|
|
versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2);
|