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math/w_log2f_compat.c
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Paul Eggert
Update copyright dates with scripts/update-copyrights
02 янв 2026, 00:42
02 янв 2026, 00:42
66f3e92
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/* Copyright (C) 2011-2026 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 <https://www.gnu.org/licenses/>. */ #include <fenv.h> #include <math.h> #include <math_private.h> #include <math-svid-compat.h> #include <libm-alias-float.h> #if LIBM_SVID_COMPAT && SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_27) /* wrapper log2f(x) */ float __log2f_compat (float x) { if (__builtin_expect (islessequal (x, 0.0f), 0) && _LIB_VERSION != _IEEE_) { if (x == 0.0f) { feraiseexcept (FE_DIVBYZERO); return __kernel_standard_f (x, x, 148); /* log2(0) */ } else { feraiseexcept (FE_INVALID); return __kernel_standard_f (x, x, 149); /* log2(x<0) */ } } return __ieee754_log2f (x); } compat_symbol (libm, __log2f_compat, log2f, GLIBC_2_1); #endif