/* Copyright (C) 2011-2016 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 <math.h> #include "math_private.h" #if defined __UCLIBC_SUSV3_LEGACY__ #if defined(__UCLIBC_HAS_FENV__) #include <errno.h> static double __attribute__ ((noinline)) sysv_scalb (double x, double fn) { double z = __ieee754_scalb (x, fn); if (__builtin_expect (isinf (z), 0)) { if (isfinite (x)) return __kernel_standard (x, fn, 32); /* scalb overflow */ else __set_errno (ERANGE); } else if (__builtin_expect (z == 0.0, 0) && z != x) return __kernel_standard (x, fn, 33); /* scalb underflow */ return z; } #endif /* __UCLIBC_HAS_FENV__ */ /* Wrapper scalb */ double scalb (double x, double fn) { #if defined(__UCLIBC_HAS_FENV__) if (__builtin_expect (_LIB_VERSION == _SVID_,0)) return sysv_scalb (x, fn); else { double z = __ieee754_scalb (x, fn); if (__builtin_expect (!isfinite (z) || z == 0.0, 0)) { 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 != 0.0 && !isinf (fn)) __set_errno (ERANGE); } } return z; } #else return __ieee754_scalb (x, fn); #endif /* __UCLIBC_HAS_FENV__ */ } libm_hidden_def(scalb) #endif