/* Copyright (C) 2011-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@gmail.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 <errno.h> #include <math.h> #include <math_private.h> #include <math-svid-compat.h> #if LIBM_SVID_COMPAT static long double __attribute__ ((noinline)) sysv_scalbl (long double x, long double fn) { long double z = __ieee754_scalbl (x, fn); if (__glibc_unlikely (isinf (z))) { if (isfinite (x)) return __kernel_standard_l (x, fn, 232); /* scalb overflow */ else __set_errno (ERANGE); } else if (__builtin_expect (z == 0.0L, 0) && z != x) return __kernel_standard_l (x, fn, 233); /* scalb underflow */ return z; } #endif /* Wrapper scalbl */ long double __scalbl (long double x, long double fn) { #if LIBM_SVID_COMPAT if (__glibc_unlikely (_LIB_VERSION == _SVID_)) return sysv_scalbl (x, fn); else #endif { long double z = __ieee754_scalbl (x, fn); if (__glibc_unlikely (!isfinite (z) || z == 0.0L)) { if (isnan (z)) { if (!isnan (x) && !isnan (fn)) __set_errno (EDOM); } else if (isinf (z)) { if (!isinf (x) && !isinf (fn)) __set_errno (ERANGE); } else { /* z == 0. */ if (x != 0.0L && !isinf (fn)) __set_errno (ERANGE); } } return z; } } weak_alias (__scalbl, scalbl)