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glibc  2.9
fegetenv.c
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00001 /* Store current floating-point environment.
00002    Copyright (C) 2000 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by David Huggins-Daines <dhd@debian.org>, 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 #include <string.h>
00023 
00024 int
00025 fegetenv (fenv_t *envp)
00026 {
00027   unsigned long long buf[4], *bufptr = buf;
00028   
00029   __asm__ (
00030           "fstd,ma %%fr0,8(%1)     \n\t"
00031           "fldd -8(%1),%%fr0       \n\t"
00032           : "=m" (buf), "+r" (bufptr) : : "%r0");
00033   memcpy(envp, buf, sizeof (*envp));
00034   return 0;
00035 }