9b767d19e6
2000-10-07 Ulrich Drepper <drepper@redhat.com> * include/features.h (__STDC_ISO_10646__): Set to correct date. Patch by Markus Kuhn <Markus.Kuhn@cl.cam.ac.uk>. 2000-10-06 Jes Sorensen <jes@linuxcare.com> * sysdeps/ia64/fpu/fraiseexcpt.c (feraiseexcept): Implement overflow generation by adding DBL_MAX to DBL_MAX instead of setting the bits manually in the fpsr and generating the exception with kill() if necessary. (feraiseexcept): Implement underflow by dividing DBL_MIN by DBL_MIN - similar to the overflow change described above. 2000-08-27 H.J. Lu <hjl@gnu.org> * sysdeps/unix/sysv/linux/ia64/clone.S: Make it a dummy as clone is not supported under Linux/ia64, use clone2. 2000-10-06 Jakub Jelinek <jakub@redhat.com> * malloc/malloc.h (__THROW): Define to nothing if not gcc. * misc/sys/cdefs.h (__THROW): Likewise.
80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/* Raise given exceptions.
|
|
Copyright (C) 1997, 1998, 2000 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 Library General Public License as
|
|
published by the Free Software Foundation; either version 2 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include <fenv.h>
|
|
#include <math.h>
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
#include <asm/fpu.h>
|
|
|
|
int
|
|
feraiseexcept (int excepts)
|
|
{
|
|
fenv_t fpsr;
|
|
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__ ("fadd.d.s0 %0=%1,f1" : "=f" (dummy) : "0" (dummy));
|
|
}
|
|
|
|
/* Success. */
|
|
return 0;
|
|
}
|