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authorUlrich Drepper <drepper@gmail.com>2011-10-12 11:27:51 -0400
committerUlrich Drepper <drepper@gmail.com>2011-10-12 11:27:51 -0400
commit0ac5ae2335292908f39031b1ea9fe8edce433c0f (patch)
treef9d26c8abc0de39d18d4c13e70f6022cdc6b461f /math/w_logf.c
parenta843a204a3e8a0dd53584dad3668771abaec84ac (diff)
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Optimize libm
libm is now somewhat integrated with gcc's -ffinite-math-only option and lots of the wrapper functions have been optimized.
Diffstat (limited to 'math/w_logf.c')
-rw-r--r--math/w_logf.c72
1 files changed, 34 insertions, 38 deletions
diff --git a/math/w_logf.c b/math/w_logf.c
index 200a8b7..52b9bef 100644
--- a/math/w_logf.c
+++ b/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>
-#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)