diff options
Diffstat (limited to 'libc/math/e_scalb.c')
| -rw-r--r-- | libc/math/e_scalb.c | 114 |
1 files changed, 51 insertions, 63 deletions
diff --git a/libc/math/e_scalb.c b/libc/math/e_scalb.c index 606af5372..3b81dd565 100644 --- a/libc/math/e_scalb.c +++ b/libc/math/e_scalb.c @@ -1,71 +1,59 @@ -/* @(#)e_scalb.c 5.1 93/09/24 */ -/* - * ==================================================== - * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. - * - * Developed at SunPro, a Sun Microsystems, Inc. business. - * Permission to use, copy, modify, and distribute this - * software is freely granted, provided that this notice - * is preserved. - * ==================================================== - */ +/* Copyright (C) 2011 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. -#if defined(LIBM_SCCS) && !defined(lint) -static char rcsid[] = "$NetBSD: e_scalb.c,v 1.6 1995/05/10 20:46:09 jtc Exp $"; -#endif + 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. -/* - * __ieee754_scalb(x, fn) is provide for - * passing various standard test suite. One - * should use scalbn() instead. - */ + 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ #include <fenv.h> #include <math.h> -#include "math_private.h" +#include <math_private.h> + -#ifdef _SCALB_INT -#ifdef __STDC__ - double __ieee754_scalb(double x, int fn) -#else - double __ieee754_scalb(x,fn) - double x; int fn; -#endif -#else -#ifdef __STDC__ - double __ieee754_scalb(double x, double fn) -#else - double __ieee754_scalb(x,fn) - double x, fn; -#endif -#endif +static double +__attribute__ ((noinline)) +invalid_fn (double x, double fn) { -#ifdef _SCALB_INT - return __scalbn(x,fn); -#else - if (__isnan(x)||__isnan(fn)) return x*fn; - if (!__finite(fn)) { - if(fn>0.0) return x*fn; - else if (x == 0) - return x; - else if (!__finite (x)) - { -# ifdef FE_INVALID - feraiseexcept (FE_INVALID); -# endif - return __nan (""); - } - else return x/(-fn); - } - if (__rint(fn)!=fn) - { -# ifdef FE_INVALID - feraiseexcept (FE_INVALID); -# endif - return __nan (""); - } - if ( fn > 65000.0) return __scalbn(x, 65000); - if (-fn > 65000.0) return __scalbn(x,-65000); - return __scalbn(x,(int)fn); -#endif + if (__rint (fn) != fn) + { + feraiseexcept (FE_INVALID); + return __nan (""); + } + else if (fn > 65000.0) + return __scalbn (x, 65000); + else + return __scalbn (x,-65000); +} + + +double +__ieee754_scalb (double x, double fn) +{ + if (__builtin_expect (__isnan (x), 0)) + return x * fn; + if (__builtin_expect (!__finite (fn), 0)) + { + if (__isnan (fn) || fn > 0.0) + return x * fn; + if (x == 0.0) + return x; + return x / -fn; + } + if (__builtin_expect ((double) (int) fn != fn, 0)) + return invalid_fn (x, fn); + + return __scalbn (x, (int) fn); } +strong_alias (__ieee754_scalb, __scalb_finite) |