diff options
Diffstat (limited to 'math/w_scalbf.c')
| -rw-r--r-- | math/w_scalbf.c | 97 |
1 files changed, 42 insertions, 55 deletions
diff --git a/math/w_scalbf.c b/math/w_scalbf.c index bd92cc1c00..b8ee3f1b46 100644 --- a/math/w_scalbf.c +++ b/math/w_scalbf.c @@ -1,66 +1,53 @@ -/* w_scalbf.c -- float version of w_scalb.c. - * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. - */ +/* Copyright (C) 2011 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. -/* - * ==================================================== - * 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. - * ==================================================== - */ + 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. -#if defined(LIBM_SCCS) && !defined(lint) -static char rcsid[] = "$NetBSD: w_scalbf.c,v 1.3 1995/05/10 20:49:50 jtc Exp $"; -#endif + 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. -/* - * wrapper scalbf(float x, float fn) is provide for - * passing various standard test suite. One - * should use scalbn() instead. - */ + 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 <errno.h> #include <math.h> #include <math_private.h> -#include <errno.h> -#ifdef __STDC__ -#ifdef _SCALB_INT - float __scalbf(float x, int fn) /* wrapper scalbf */ -#else - float __scalbf(float x, float fn) /* wrapper scalbf */ -#endif -#else - float __scalbf(x,fn) /* wrapper scalbf */ -#ifdef _SCALB_INT - float x; int fn; -#else - float x,fn; -#endif -#endif +static float +__attribute__ ((noinline)) +sysv_scalbf (float x, float fn) +{ + float z = __ieee754_scalbf (x, fn); + + if (__builtin_expect (__isinff (z), 0)) + { + if (__finitef (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; +} + + +/* Wrapper scalbf */ +float +__scalbf (float x, float fn) { -#ifdef _IEEE_LIBM - return __ieee754_scalbf(x,fn); -#else - float z; - z = __ieee754_scalbf(x,fn); - if(_LIB_VERSION != _SVID_) return z; - if(!(__finitef(z)||__isnanf(z))&&__finitef(x)) { - /* scalbf overflow */ - return (float)__kernel_standard((double)x,(double)fn,132); - } - if(z==(float)0.0&&z!=x) { - /* scalbf underflow */ - return (float)__kernel_standard((double)x,(double)fn,133); - } -#ifndef _SCALB_INT - if(!__finitef(fn)) __set_errno (ERANGE); -#endif - return z; -#endif + return (__builtin_expect (_LIB_VERSION == _SVID_, 0) + ? sysv_scalbf (x, fn) + : __ieee754_scalbf (x, fn)); } weak_alias (__scalbf, scalbf) |