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glibc  2.9
fclrexcpt.c
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00001 /* Clear given exceptions in current floating-point environment.
00002    Copyright (C) 1997,99,2000,01 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
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 __feclearexcept (int excepts)
00025 {
00026   fexcept_t fpsr;
00027 
00028   /* Mask out unsupported bits/exceptions.  */
00029   excepts &= FE_ALL_EXCEPT;
00030 
00031   /* Fetch the fpu status register.  */
00032   __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (fpsr));
00033 
00034   /* Clear the relevant bits.  */
00035   fpsr &= ~excepts;
00036 
00037   /* Put the new data in effect.  */
00038   __asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (fpsr));
00039 
00040   /* Success.  */
00041   return 0;
00042 }
00043 
00044 #include <shlib-compat.h>
00045 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
00046 strong_alias (__feclearexcept, __old_feclearexcept)
00047 compat_symbol (libm, __old_feclearexcept, feclearexcept, GLIBC_2_1);
00048 #endif
00049 
00050 versioned_symbol (libm, __feclearexcept, feclearexcept, GLIBC_2_2);