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glibc  2.9
fesetenv.c
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00001 /* Install given floating-point environment.
00002    Copyright (C) 1997, 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Jes Sorensen <Jes.Sorensen@cern.ch>, 2000
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #include <fenv.h>
00022 
00023 int
00024 fesetenv (const fenv_t *envp)
00025 {
00026   fenv_t env;
00027 
00028   /*
00029      This stinks!
00030      Magic encoding of default values: bit 62+63 set (which will never
00031      happen for a user-space address) means it's not indirect.
00032   */
00033   if (((fenv_t) envp >> 62) == 0x03)
00034     env = (fenv_t) envp & 0x3fffffffffffffff;
00035   else
00036     env = *envp;
00037 
00038   __asm__ __volatile__ ("mov.m ar.fpsr=%0;;" :: "r" (env));
00039 
00040   return 0;
00041 }
00042 libm_hidden_def (fesetenv)