mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-21 04:31:04 +08:00
81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
|
/* Raise given exceptions.
|
||
|
|
Copyright (C) 1997, 1998, 2000, 2001, 2002, 2007
|
||
|
|
Free Software Foundation, Inc.
|
||
|
|
This file is part of the GNU C Library.
|
||
|
|
Contributed by Jes Sorensen <Jes.Sorensen@cern.ch>, 2000.
|
||
|
|
|
||
|
|
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, write to the Free
|
||
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||
|
|
02111-1307 USA. */
|
||
|
|
|
||
|
|
#include <fenv.h>
|
||
|
|
#include <float.h>
|
||
|
|
#include <math.h>
|
||
|
|
#include <signal.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
int
|
||
|
|
feraiseexcept (int excepts)
|
||
|
|
{
|
||
|
|
double tmp;
|
||
|
|
double dummy;
|
||
|
|
|
||
|
|
/* 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 precedes the inexact exception. */
|
||
|
|
|
||
|
|
/* We do these bits in assembly to be certain GCC doesn't optimize
|
||
|
|
away something important. */
|
||
|
|
|
||
|
|
/* First: invalid exception. */
|
||
|
|
if (FE_INVALID & excepts)
|
||
|
|
{
|
||
|
|
/* One example of a invalid operation is 0 * Infinity. */
|
||
|
|
tmp = 0;
|
||
|
|
__asm__ __volatile__ ("frcpa.s0 %0,p1=f0,f0" : "=f" (tmp) : : "p1" );
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Next: division by zero. */
|
||
|
|
if (FE_DIVBYZERO & excepts)
|
||
|
|
__asm__ __volatile__ ("frcpa.s0 %0,p1=f1,f0" : "=f" (tmp) : : "p1" );
|
||
|
|
|
||
|
|
/* Next: overflow. */
|
||
|
|
if (FE_OVERFLOW & excepts)
|
||
|
|
{
|
||
|
|
dummy = DBL_MAX;
|
||
|
|
|
||
|
|
__asm__ __volatile__ ("fadd.d.s0 %0=%1,%1" : "=f" (dummy) : "0" (dummy));
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Next: underflow. */
|
||
|
|
if (FE_UNDERFLOW & excepts)
|
||
|
|
{
|
||
|
|
dummy = DBL_MIN;
|
||
|
|
|
||
|
|
__asm__ __volatile__ ("fnma.d.s0 %0=%1,%1,f0" : "=f" (tmp) : "f" (dummy));
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Last: inexact. */
|
||
|
|
if (FE_INEXACT & excepts)
|
||
|
|
{
|
||
|
|
dummy = DBL_MAX;
|
||
|
|
__asm__ __volatile__ ("fsub.d.s0 %0=%1,f1" : "=f" (dummy) : "0" (dummy));
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Success. */
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
libm_hidden_def (feraiseexcept)
|