1  /* Install given floating-point environment.
       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.h>
      20  #include <fenv_private.h>
      21  #include <shlib-compat.h>
      22  
      23  int
      24  __fesetenv (const fenv_t *envp)
      25  {
      26    fenv_t dummy;
      27  
      28    /* Put these constants in memory explicitly, so as to cope with a
      29       -fPIC bug as of gcc 970624.  Making them automatic is quicker
      30       than loading up the pic register in this instance.  */
      31  
      32    if (envp == FE_DFL_ENV)
      33      {
      34        dummy = 0;
      35        envp = &dummy;
      36      }
      37    else if (envp == FE_NOMASK_ENV)
      38      {
      39        dummy = 0x1f << 23;
      40        envp = &dummy;
      41      }
      42  
      43    __fenv_ldfsr (*envp);
      44  
      45    /* Success.  */
      46    return 0;
      47  }
      48  
      49  #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
      50  strong_alias (__fesetenv, __old_fesetenv)
      51  compat_symbol (libm, __old_fesetenv, fesetenv, GLIBC_2_1);
      52  #endif
      53  
      54  libm_hidden_def (__fesetenv)
      55  libm_hidden_ver (__fesetenv, fesetenv)
      56  versioned_symbol (libm, __fesetenv, fesetenv, GLIBC_2_2);