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glibc  2.9
fedisblxcpt.c
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00001 /* Disable floating-point exceptions.
00002    Copyright (C) 2000, 2008 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Geoffrey Keating <geoffk@geoffk.org>, 2000.
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_libc.h>
00022 
00023 int
00024 fedisableexcept (int excepts)
00025 {
00026   fenv_union_t fe;
00027   int result, new;
00028 
00029   result = __fegetexcept ();
00030 
00031   if ((excepts & FE_ALL_INVALID) == FE_ALL_INVALID)
00032     excepts = (excepts | FE_INVALID) & ~ FE_ALL_INVALID;
00033 
00034   fe.fenv = fegetenv_register ();
00035   if (excepts & FE_INEXACT)
00036     fe.l[1] &= ~(1 << (31 - FPSCR_XE));
00037   if (excepts & FE_DIVBYZERO)
00038     fe.l[1] &= ~(1 << (31 - FPSCR_ZE));
00039   if (excepts & FE_UNDERFLOW)
00040     fe.l[1] &= ~(1 << (31 - FPSCR_UE));
00041   if (excepts & FE_OVERFLOW)
00042     fe.l[1] &= ~(1 << (31 - FPSCR_OE));
00043   if (excepts & FE_INVALID)
00044     fe.l[1] &= ~(1 << (31 - FPSCR_VE));
00045   fesetenv_register (fe.fenv);
00046 
00047   new = __fegetexcept ();
00048   if (new == 0 && result != 0)
00049     (void)__fe_mask_env ();
00050 
00051   if ((new & excepts) != 0)
00052     result = -1;
00053   return result;
00054 }