Back to index

glibc  2.9
ftestexcept.c
Go to the documentation of this file.
00001 /* Test exception in current environment.
00002    Copyright (C) 1997, 2003, 2004 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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 <unistd.h>
00023 #include <dl-procinfo.h>
00024 #include <ldsodefs.h>
00025 
00026 int
00027 fetestexcept (int excepts)
00028 {
00029   short temp;
00030   int xtemp = 0;
00031 
00032   /* Get current exceptions.  */
00033   __asm__ ("fnstsw %0" : "=a" (temp));
00034 
00035   /* If the CPU supports SSE we test the MXCSR as well.  */
00036   if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
00037     __asm__ ("stmxcsr %0" : "=m" (*&xtemp));
00038 
00039   return (temp | xtemp) & excepts & FE_ALL_EXCEPT;
00040 }