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glibc  2.9
setfpucw.c
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00001 /* Set the FPU control word.
00002    Copyright (C) 1996, 1997, 1999 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <math.h>
00021 #include <fpu_control.h>
00022 
00023 void
00024 __setfpucw (fpu_control_t set)
00025 {
00026   fpu_control_t cw;
00027 
00028   /* Fetch the current control word.  */
00029   _FPU_GETCW (cw);
00030 
00031   /* Preserve the reserved bits, and set the rest as the user
00032      specified (or the default, if the user gave zero).  */
00033   cw &= _FPU_RESERVED;
00034   cw |= set & ~_FPU_RESERVED;
00035 
00036   _FPU_SETCW (cw);
00037 }