sysdeps/powerpc/fpu/fesetmode.c

   1 /* Install given floating-point control modes.  PowerPC version.
   2    Copyright (C) 2016-2019 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 fesetmode (const femode_t *modep)
  24 {
  25   fenv_union_t old, new;
  26
  27   /* Logic regarding enabled exceptions as in fesetenv.  */
  28
  29   new.fenv = *modep;
  30   old.fenv = fegetenv_status ();
  31   new.l = (new.l & ~FPSCR_STATUS_MASK) | (old.l & FPSCR_STATUS_MASK);
  32
  33   if (old.l == new.l)
  34     return 0;
  35
  36   if ((old.l & FPSCR_ENABLES_MASK) == 0 && (new.l & FPSCR_ENABLES_MASK) != 0)
  37     (void) __fe_nomask_env_priv ();
  38
  39   if ((old.l & FPSCR_ENABLES_MASK) != 0 && (new.l & FPSCR_ENABLES_MASK) == 0)
  40     (void) __fe_mask_env ();
  41
  42   fesetenv_mode (new.fenv);
  43   return 0;
  44 }