mirror of
https://sourceware.org/git/glibc.git
synced 2025-01-11 20:00:07 +00:00
30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/* Raise given exceptions.
|
|
Copyright (C) 1997-2021 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>
|
|
|
|
/* Please see section 10,
|
|
page 10-5 "Delayed Trapping" in the PA-RISC 2.0 Architecture manual */
|
|
|
|
int
|
|
__feraiseexcept (int excepts)
|
|
{
|
|
/* Raise exceptions represented by EXCEPTS. But we must raise only one
|
|
signal at a time. It is important that if the overflow/underflow
|
|
exception and the divide by zero exception are given at the same
|
|
time, the overflow/underflow exception follows the divide by zero
|
|
exception. */
|
|
|
|
/* We do these bits in assembly to be certain GCC doesn't optimize
|
|
away something important, and so we can force delayed traps to
|
|
occur. */
|
|
|
|
/* We use "fldd 0(%%sr0,%%sp),%0" to flush the delayed exception */
|
|
|
|
/* First: Invalid exception. */
|
|
if (excepts & FE_INVALID)
|
|
{
|
|
/* One example of an invalid operation is 0 * Infinity. */
|
|
double d = HUGE_VAL;
|
|
__asm__ __volatile__ (
|
|
" fcpy,dbl %%fr0,%%fr22\n"
|
|
" fmpy,dbl %0,%%fr22,%0\n"
|
|
" fldd 0(%%sr0,%%sp),%0"
|
|
: "+f" (d) : : "%fr22" );
|
|
}
|
|
|
|
/* Second: Division by zero. */
|
|
if (excepts & FE_DIVBYZERO)
|
|
{
|
|
double d = 1.0;
|
|
__asm__ __volatile__ (
|
|
" fcpy,dbl %%fr0,%%fr22\n"
|
|
" fdiv,dbl %0,%%fr22,%0\n"
|
|
" fldd 0(%%sr0,%%sp),%0"
|
|
: "+f" (d) : : "%fr22" );
|
|
}
|
|
|
|
/* Third: Overflow. */
|
|
if (excepts & FE_OVERFLOW)
|
|
{
|
|
double d = DBL_MAX;
|
|
__asm__ __volatile__ (
|
|
" fadd,dbl %0,%0,%0\n"
|
|
" fldd 0(%%sr0,%%sp),%0"
|
|
: "+f" (d) );
|
|
}
|
|
|
|
/* Fourth: Underflow. */
|
|
if (excepts & FE_UNDERFLOW)
|
|
{
|
|
double d = DBL_MIN;
|
|
double e = 3.0;
|
|
__asm__ __volatile__ (
|
|
" fdiv,dbl %0,%1,%0\n"
|
|
" fldd 0(%%sr0,%%sp),%0"
|
|
: "+f" (d) : "f" (e) );
|
|
}
|
|
|
|
/* Fifth: Inexact */
|
|
if (excepts & FE_INEXACT)
|
|
{
|
|
double d = M_PI;
|
|
double e = 69.69;
|
|
__asm__ __volatile__ (
|
|
" fdiv,dbl %0,%1,%%fr22\n"
|
|
" fcnvfxt,dbl,sgl %%fr22,%%fr22L\n"
|
|
" fldd 0(%%sr0,%%sp),%%fr22"
|
|
: : "f" (d), "f" (e) : "%fr22" );
|
|
}
|
|
|
|
/* Success. */
|
|
return 0;
|
|
}
|
|
libm_hidden_def (__feraiseexcept)
|
|
weak_alias (__feraiseexcept, feraiseexcept)
|
|
libm_hidden_weak (feraiseexcept)
|