mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/* Raise given exceptions.
|
|
Copyright (C) 1997 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Richard Henderson <rth@tamu.edu>, 1997.
|
|
|
|
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>
|
|
|
|
void
|
|
feraiseexcept (int excepts)
|
|
{
|
|
double tmp;
|
|
|
|
/* 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. */
|
|
__asm__ __volatile__("mult/sui $f31,%1,%0; trapb"
|
|
: "=f"(tmp) : "f"(HUGE_VAL));
|
|
}
|
|
|
|
/* Next: division by zero. */
|
|
if (FE_DIVBYZERO & excepts)
|
|
{
|
|
__asm__ __volatile__("cmpteq $f31,$f31,%0; divt/sui %0,$f31,%0; trapb"
|
|
: "=f"(tmp));
|
|
}
|
|
|
|
/* Next: overflow. */
|
|
if (FE_OVERFLOW & excepts)
|
|
{
|
|
__asm__ __volatile__("mult/sui %1,%1,%0; trapb"
|
|
: "=f"(tmp) : "f"(DBL_MAX));
|
|
}
|
|
|
|
/* Next: underflow. */
|
|
if (FE_UNDERFLOW & excepts)
|
|
{
|
|
__asm__ __volatile__("divt/sui %1,%2,%0; trapb"
|
|
: "=f"(tmp) : "f"(DBL_MIN), "f"(16.0));
|
|
}
|
|
|
|
/* Last: inexact. */
|
|
if (FE_INEXACT & excepts)
|
|
{
|
|
__asm__ __volatile__("divt/sui %1,%2,%0; trapb"
|
|
: "=f"(tmp) : "f"(1.0), "f"(M_PI));
|
|
}
|
|
}
|