/* 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 __UCLIBC_HAS_FENV__ #include <errno.h> static float __attribute__ ((noinline)) sysv_scalbf (float x, float fn) { float z = (float) __ieee754_scalb ((double) x, (double) fn); if (__builtin_expect (isinf (z),0)) { if (isfinite (x)) return __kernel_standard_f (x, fn, 132); /* scalb overflow */ else __set_errno (ERANGE); } else if (__builtin_expect (z == 0.0f, 0) && z != x) return __kernel_standard_f (x, fn, 133); /* scalb underflow */ return z; } #endif /* Wrapper scalbf */ float scalbf (float x, float fn) { #if __UCLIBC_HAS_FENV__ if (__builtin_expect (_LIB_VERSION == _SVID_, 0)) return sysv_scalbf (x, fn); else { float z = (float) __ieee754_scalb ((double) x, (double) fn); if (__builtin_expect (!isfinite (z) || z == 0.0f, 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 != 0.0f && !isinf (fn)) __set_errno (ERANGE); } } return z; } #else return (float) __ieee754_scalb ((double) x, (double) fn); #endif /* __UCLIBC_HAS_FENV__ */ }