sysdeps/powerpc/fpu/fesetexcept.c

   1 /* Set given exception flags.  PowerPC version.
   2    Copyright (C) 2016-2023 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
  21 int
  22 fesetexcept (int excepts)
  23 {
  24   fenv_union_t u, n;
  25
  26   u.fenv = fegetenv_register ();
  27   n.l = (u.l
  28          | (excepts & FPSCR_STICKY_BITS)
  29          /* Turn FE_INVALID into FE_INVALID_SOFTWARE.  */
  30          | (excepts >> ((31 - FPSCR_VX) - (31 - FPSCR_VXSOFT))
  31             & FE_INVALID_SOFTWARE));
  32   if (n.l != u.l)
  33     {
  34       if (n.l & fenv_exceptions_to_reg (excepts))
  35         /* Setting the exception flags may trigger a trap.  ISO C 23 § 7.6.4.4
  36             does not allow it.   */
  37         return -1;
  38
  39       fesetenv_register (n.fenv);
  40
  41       /* Deal with FE_INVALID_SOFTWARE not being implemented on some chips.  */
  42       if (excepts & FE_INVALID)
  43         feraiseexcept (FE_INVALID);
  44     }
  45
  46   return 0;
  47 }