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glibc  2.9
feenablxcpt.c
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00001 /* Enable floating-point exceptions.
00002    Copyright (C) 2000, 2004 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Alexandre Oliva <aoliva@redhat.com>
00005    based on corresponding file in the MIPS port.
00006 
00007    The GNU C Library is free software; you can redistribute it and/or
00008    modify it under the terms of the GNU Lesser General Public
00009    License as published by the Free Software Foundation; either
00010    version 2.1 of the License, or (at your option) any later version.
00011 
00012    The GNU C Library is distributed in the hope that it will be useful,
00013    but WITHOUT ANY WARRANTY; without even the implied warranty of
00014    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015    Lesser General Public License for more details.
00016 
00017    You should have received a copy of the GNU Lesser General Public
00018    License along with the GNU C Library; if not, write to the Free
00019    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00020    02111-1307 USA.  */
00021 
00022 #include <fenv.h>
00023 #include <fenv_libc.h>
00024 #include <fpu_control.h>
00025 
00026 int
00027 feenableexcept (int excepts)
00028 {
00029   fpu_control_t new_exc, old_exc;
00030 
00031   /* Get the current control word.  */
00032   _FPU_GETCW (new_exc);
00033 
00034   old_exc = (new_exc & ENABLE_MASK) >> ENABLE_SHIFT;
00035 
00036   excepts &= FE_ALL_EXCEPT;
00037 
00038   new_exc |= excepts << ENABLE_SHIFT;
00039   _FPU_SETCW (new_exc);
00040 
00041   return old_exc;
00042 }