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glibc  2.9
ftestexcept.c
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00001 /* Test exception in current environment.
00002    Copyright (C) 2001 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 <fenv.h>
00021 
00022 int
00023 fetestexcept (int excepts)
00024 {
00025   int temp;
00026   unsigned int mxscr;
00027 
00028   /* Get current exceptions.  */
00029   __asm__ ("fnstsw %0\n"
00030           "stmxcsr %1" : "=m" (*&temp), "=m" (*&mxscr));
00031 
00032   return (temp | mxscr) & excepts & FE_ALL_EXCEPT;
00033 }