sysdeps/powerpc/fpu/feupdateenv.c

   1 /* Install given floating-point environment and raise exceptions.
   2    Copyright (C) 1997-2019 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <fenv_libc.h>
  21 #include <fpu_control.h>
  22
  23 int
  24 __feupdateenv (const fenv_t *envp)
  25 {
  26   fenv_union_t old, new;
  27
  28   /* Save the currently set exceptions.  */
  29   new.fenv = *envp;
  30   old.fenv = fegetenv_register ();
  31
  32   /* Restore rounding mode and exception enable from *envp and merge
  33      exceptions.  Leave fraction rounded/inexact and FP result/CC bits
  34      unchanged.  */
  35   new.l = (old.l & 0xffffffff1fffff00LL) | (new.l & 0x1ff80fff);
  36
  37   __TEST_AND_EXIT_NON_STOP (old.l, new.l);
  38   __TEST_AND_ENTER_NON_STOP (old.l, new.l);
  39
  40   /* Atomically enable and raise (if appropriate) exceptions set in `new'. */
  41   fesetenv_register (new.fenv);
  42
  43   /* Success.  */
  44   return 0;
  45 }
  46
  47 #include <shlib-compat.h>
  48 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  49 strong_alias (__feupdateenv, __old_feupdateenv)
  50 compat_symbol (libm, __old_feupdateenv, feupdateenv, GLIBC_2_1);
  51 #endif
  52
  53 libm_hidden_def (__feupdateenv)
  54 libm_hidden_ver (__feupdateenv, feupdateenv)
  55 versioned_symbol (libm, __feupdateenv, feupdateenv, GLIBC_2_2);