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/* Raise given exceptions.
Copyright (C) 1997-2020 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 <float.h>
#include <math.h>
#include <shlib-compat.h>
int
__feraiseexcept (int excepts)
{
static const struct {
double zero, one, max, min, pi;
} c = {
0.0, 1.0, DBL_MAX, DBL_MIN, M_PI
};
double d;
/* Raise exceptions represented by EXPECTS. But we must raise only
one signal at a time. It is important the 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. */
__asm ("" : "=e" (d) : "0" (c.zero));
d /= c.zero;
__asm __volatile ("" : : "e" (d));
}
/* Next: division by zero. */
if ((FE_DIVBYZERO & excepts) != 0)
{
__asm ("" : "=e" (d) : "0" (c.one));
d /= c.zero;
__asm __volatile ("" : : "e" (d));
}
/* Next: overflow. */
if ((FE_OVERFLOW & excepts) != 0)
{
__asm ("" : "=e" (d) : "0" (c.max));
d *= d;
__asm __volatile ("" : : "e" (d));
}
/* Next: underflow. */
if ((FE_UNDERFLOW & excepts) != 0)
{
__asm ("" : "=e" (d) : "0" (c.min));
d *= d;
__asm __volatile ("" : : "e" (d));
}
/* Last: inexact. */
if ((FE_INEXACT & excepts) != 0)
{
__asm ("" : "=e" (d) : "0" (c.one));
d /= c.pi;
__asm __volatile ("" : : "e" (d));
}
/* Success. */
return 0;
}
#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);
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