/* Store current floating-point environment and clear exceptions. Copyright (C) 1997-2013 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see . */ #include #include #define _FPU_MASK_ALL (_FPU_MASK_ZM | _FPU_MASK_OM | _FPU_MASK_UM | _FPU_MASK_XM | _FPU_MASK_IM) int feholdexcept (fenv_t *envp) { fenv_union_t old, new; /* Save the currently set exceptions. */ old.fenv = *envp = fegetenv_register (); /* Clear everything except for the rounding modes and non-IEEE arithmetic flag. */ new.l[1] = old.l[1] & 7; new.l[0] = old.l[0]; /* If the old env had any eabled exceptions, then mask SIGFPE in the MSR FE0/FE1 bits. This may allow the FPU to run faster because it always takes the default action and can not generate SIGFPE. */ if ((old.l[1] & _FPU_MASK_ALL) != 0) (void)__fe_mask_env (); /* Put the new state in effect. */ fesetenv_register (new.fenv); return 0; } libm_hidden_def (feholdexcept)