diff options
Diffstat (limited to 'libc/math/w_logf.c')
| -rw-r--r-- | libc/math/w_logf.c | 74 |
1 files changed, 35 insertions, 39 deletions
diff --git a/libc/math/w_logf.c b/libc/math/w_logf.c index 46d974911..52b9befd1 100644 --- a/libc/math/w_logf.c +++ b/libc/math/w_logf.c @@ -1,49 +1,45 @@ -/* w_logf.c -- float version of w_log.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_logf.c,v 1.3 1995/05/10 20:49:40 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 logf(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" +#include <math_private.h> -#ifdef __STDC__ - float __logf(float x) /* wrapper logf */ -#else - float __logf(x) /* wrapper logf */ - float x; -#endif +/* wrapper logf(x) */ +float +__logf (float x) { -#ifdef _IEEE_LIBM - return __ieee754_logf(x); -#else - float z; - z = __ieee754_logf(x); - if(_LIB_VERSION == _IEEE_ || __isnanf(x) || x > (float)0.0) return z; - if(x==(float)0.0) - /* logf(0) */ - return (float)__kernel_standard((double)x,(double)x,116); - else - /* logf(x<0) */ - return (float)__kernel_standard((double)x,(double)x,117); -#endif + if (__builtin_expect (x <= 0.0f, 0) && _LIB_VERSION != _IEEE_) + { + if (x == 0.0f) + { + feraiseexcept (FE_DIVBYZERO); + return __kernel_standard_f (x, x, 116); /* log(0) */ + } + else + { + feraiseexcept (FE_INVALID); + return __kernel_standard_f (x, x, 117); /* log(x<0) */ + } + } + + return __ieee754_logf (x); } weak_alias (__logf, logf) |