diff options
Diffstat (limited to 'math/w_log10f.c')
| -rw-r--r-- | math/w_log10f.c | 75 |
1 files changed, 34 insertions, 41 deletions
diff --git a/math/w_log10f.c b/math/w_log10f.c index f2ac540f6b..3426e2d05b 100644 --- a/math/w_log10f.c +++ b/math/w_log10f.c @@ -1,52 +1,45 @@ -/* w_log10f.c -- float version of w_log10.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_log10f.c,v 1.3 1995/05/10 20:49:37 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 log10f(X) - */ + 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> -#ifdef __STDC__ - float __log10f(float x) /* wrapper log10f */ -#else - float __log10f(x) /* wrapper log10f */ - float x; -#endif +/* wrapper log10f(x) */ +float +__log10f (float x) { -#ifdef _IEEE_LIBM - return __ieee754_log10f(x); -#else - float z; - z = __ieee754_log10f(x); - if(_LIB_VERSION == _IEEE_ || __isnanf(x)) return z; - if(x<=(float)0.0) { - if(x==(float)0.0) - /* log10(0) */ - return (float)__kernel_standard((double)x,(double)x,118); - else - /* log10(x<0) */ - return (float)__kernel_standard((double)x,(double)x,119); - } else - return z; -#endif + if (__builtin_expect (x <= 0.0f, 0) && _LIB_VERSION != _IEEE_) + { + if (x == 0.0f) + { + feraiseexcept (FE_DIVBYZERO); + return __kernel_standard_f (x, x, 118); /* log10(0) */ + } + else + { + feraiseexcept (FE_INVALID); + return __kernel_standard_f (x, x, 119); /* log10(x<0) */ + } + } + + return __ieee754_log10f (x); } weak_alias (__log10f, log10f) |