/* Copyright (C) 2012 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Adhemerval Zanella <azanella@linux.vnet.ibm.com>, 2011. 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 <http://www.gnu.org/licenses/>. */ #include <math.h> #include <errno.h> #include <math_private.h> /* wrapper ilogb */ int __ilogb (double x) { int r = __ieee754_ilogb (x); if (__builtin_expect (r == FP_ILOGB0, 0) || __builtin_expect (r == FP_ILOGBNAN, 0) || __builtin_expect (r == INT_MAX, 0)) { __set_errno (EDOM); feraiseexcept (FE_INVALID); } return r; } weak_alias (__ilogb, ilogb) #ifdef NO_LONG_DOUBLE strong_alias (__ilogb, __ilogbl) weak_alias (__ilogb, ilogbl) #endif