diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/w_exp.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/w_exp.c | 79 |
1 files changed, 35 insertions, 44 deletions
diff --git a/sysdeps/ieee754/dbl-64/w_exp.c b/sysdeps/ieee754/dbl-64/w_exp.c index 1216492090..f1becff94c 100644 --- a/sysdeps/ieee754/dbl-64/w_exp.c +++ b/sysdeps/ieee754/dbl-64/w_exp.c @@ -1,55 +1,46 @@ -/* @(#)w_exp.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. - * ==================================================== - */ - -#if defined(LIBM_SCCS) && !defined(lint) -static char rcsid[] = "$NetBSD: w_exp.c,v 1.6 1995/05/10 20:48:51 jtc Exp $"; -#endif +/* Copyright (C) 2011 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. -/* - * wrapper exp(x) - */ + 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. -#include "math.h" -#include "math_private.h" + 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 <math.h> +#include <math_private.h> -#ifdef __STDC__ static const double -#else -static double -#endif o_threshold= 7.09782712893383973096e+02, /* 0x40862E42, 0xFEFA39EF */ u_threshold= -7.45133219101941108420e+02; /* 0xc0874910, 0xD52D3051 */ -#ifdef __STDC__ - double __exp(double x) /* wrapper exp */ -#else - double __exp(x) /* wrapper exp */ - double x; -#endif + +/* wrapper exp */ +double +__exp (double x) { -#ifdef _IEEE_LIBM - return __ieee754_exp(x); -#else - double z; - z = __ieee754_exp(x); - if(_LIB_VERSION == _IEEE_) return z; - if(__finite(x)) { - if(x>o_threshold) - return __kernel_standard(x,x,6); /* exp overflow */ - else if(x<u_threshold) - return __kernel_standard(x,x,7); /* exp underflow */ - } - return z; -#endif + if (__builtin_expect (x > o_threshold, 0)) + { + if (_LIB_VERSION != _IEEE_) + return __kernel_standard_f (x, x, 6); + } + else if (__builtin_expect (x < u_threshold, 0)) + { + if (_LIB_VERSION != _IEEE_) + return __kernel_standard_f (x, x, 7); + } + + return __ieee754_exp (x); } hidden_def (__exp) weak_alias (__exp, exp) |