sysdeps/powerpc/fpu/feholdexcpt.c

   1 /* Store current floating-point environment and clear exceptions.
   2    Copyright (C) 1997-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <fenv_libc.h>
  20 #include <fpu_control.h>
  21
  22 int
  23 __feholdexcept (fenv_t *envp)
  24 {
  25   fenv_union_t old, new;
  26
  27   /* Save the currently set exceptions.  */
  28   old.fenv = *envp = fegetenv_register ();
  29
  30   /* Clear everything except for the rounding modes and non-IEEE arithmetic
  31      flag.  */
  32   new.l = old.l & 0xffffffff00000007LL;
  33
  34   if (new.l == old.l)
  35     return 0;
  36
  37   __TEST_AND_ENTER_NON_STOP (old.l, 0ULL);
  38
  39   /* Put the new state in effect.  */
  40   fesetenv_register (new.fenv);
  41
  42   return 0;
  43 }
  44 libm_hidden_def (__feholdexcept)
  45 weak_alias (__feholdexcept, feholdexcept)
  46 libm_hidden_weak (feholdexcept)