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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>
106 lines
3.3 KiB
C
106 lines
3.3 KiB
C
/* Raise given exceptions.
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Copyright (C) 2000-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <fenv_libc.h>
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#include <float.h>
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#include <math.h>
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static __inline__ void
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fexceptdiv (float d, float e)
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{
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__asm__ __volatile__ ("debr %0,%1" : : "f" (d), "f" (e) );
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}
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static __inline__ void
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fexceptadd (float d, float e)
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{
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__asm__ __volatile__ ("aebr %0,%1" : : "f" (d), "f" (e) );
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}
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#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
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static __inline__ void
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fexceptround (double e)
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{
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float d;
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/* Load rounded from double to float with M3 = round toward 0, M4 = Suppress
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IEEE-inexact exception.
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In case of e=0x1p128 and the overflow-mask bit is zero, only the
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IEEE-overflow flag is set. If overflow-mask bit is one, DXC field is set to
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0x20 "IEEE overflow, exact".
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In case of e=0x1p-150 and the underflow-mask bit is zero, only the
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IEEE-underflow flag is set. If underflow-mask bit is one, DXC field is set
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to 0x10 "IEEE underflow, exact".
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This instruction is available with a zarch machine >= z196. */
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__asm__ __volatile__ ("ledbra %0,5,%1,4" : "=f" (d) : "f" (e) );
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}
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#endif
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int
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__feraiseexcept (int excepts)
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{
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/* Raise exceptions represented by EXPECTS. But we must raise only
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one signal at a time. It is important that if the overflow/underflow
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exception and the inexact exception are given at the same time,
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the overflow/underflow exception follows the inexact exception. */
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/* First: invalid exception. */
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if (FE_INVALID & excepts)
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fexceptdiv (0.0, 0.0);
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/* Next: division by zero. */
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if (FE_DIVBYZERO & excepts)
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fexceptdiv (1.0, 0.0);
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/* Next: overflow. */
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if (FE_OVERFLOW & excepts)
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{
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#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
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fexceptround (0x1p128);
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#else
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/* If overflow-mask bit is zero, both IEEE-overflow and IEEE-inexact flags
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are set. If overflow-mask bit is one, DXC field is set to 0x2C "IEEE
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overflow, inexact and incremented". */
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fexceptadd (FLT_MAX, 1.0e32);
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#endif
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}
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/* Next: underflow. */
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if (FE_UNDERFLOW & excepts)
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{
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#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
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fexceptround (0x1p-150);
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#else
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/* If underflow-mask bit is zero, both IEEE-underflow and IEEE-inexact
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flags are set. If underflow-mask bit is one, DXC field is set to 0x1C
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"IEEE underflow, inexact and incremented". */
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fexceptdiv (FLT_MIN, 3.0);
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#endif
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}
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/* Last: inexact. */
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if (FE_INEXACT & excepts)
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fexceptdiv (2.0, 3.0);
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/* Success. */
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return 0;
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}
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libm_hidden_def (__feraiseexcept)
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weak_alias (__feraiseexcept, feraiseexcept)
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libm_hidden_weak (feraiseexcept)
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