sysdeps/ia64/fpu/fesetenv.c

   1 /* Install given floating-point environment.
   2    Copyright (C) 1997-2022 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.h>
  20
  21 int
  22 __fesetenv (const fenv_t *envp)
  23 {
  24   fenv_t env;
  25
  26   /*
  27      This stinks!
  28      Magic encoding of default values: bit 62+63 set (which will never
  29      happen for a user-space address) means it's not indirect.
  30   */
  31   if (((fenv_t) envp >> 62) == 0x03)
  32     env = (fenv_t) envp & 0x3fffffffffffffff;
  33   else
  34     env = *envp;
  35
  36   __asm__ __volatile__ ("mov.m ar.fpsr=%0;;" :: "r" (env));
  37
  38   return 0;
  39 }
  40 libm_hidden_def (__fesetenv)
  41 weak_alias (__fesetenv, fesetenv)
  42 libm_hidden_weak (fesetenv)