1 /* Wrapper to implement llogb in terms of ilogb. 2 Copyright (C) 2012-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #include <math.h> 20 #include <errno.h> 21 #include <limits.h> 22 #include <math_private.h> 23 #include <fenv.h> 24 25 long int M_DECL_FUNC(__llogb)26M_DECL_FUNC (__llogb) (FLOAT x) 27 { 28 int r = M_SUF (__ieee754_ilogb) (x); 29 long int lr = r; 30 if (__glibc_unlikely (r == FP_ILOGB0) 31 || __glibc_unlikely (r == FP_ILOGBNAN) 32 || __glibc_unlikely (r == INT_MAX)) 33 { 34 #if LONG_MAX != INT_MAX 35 if (r == FP_ILOGB0) 36 lr = FP_LLOGB0; 37 else if (r == FP_ILOGBNAN) 38 lr = FP_LLOGBNAN; 39 else 40 lr = LONG_MAX; 41 #endif 42 __set_errno (EDOM); 43 __feraiseexcept (FE_INVALID); 44 } 45 return lr; 46 } 47 declare_mgen_alias (__llogb, llogb) 48