Optimize libm

libm is now somewhat integrated with gcc's -ffinite-math-only option
and lots of the wrapper functions have been optimized.

1 files changed, 26 insertions, 38 deletions

diff --git a/math/w_atanh.c b/math/w_atanh.c
index a2dab67..61ea0d8 100644
--- a/math/w_atanh.c
+++ b/math/w_atanh.c
@@ -1,49 +1,37 @@
-/* @(#)w_atanh.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.
- * ====================================================
- */
+/* Copyright (C) 2011 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
 
-#if defined(LIBM_SCCS) && !defined(lint)
-static char rcsid[] = "$NetBSD: w_atanh.c,v 1.6 1995/05/10 20:48:43 jtc Exp $";
-#endif
+   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.
+
+   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 atanh(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 <math.h>
 #include <math_private.h>
 
 
-#ifdef __STDC__
-	double __atanh(double x)		/* wrapper atanh */
-#else
-	double __atanh(x)			/* wrapper atanh */
-	double x;
-#endif
+/* wrapper atanh */
+double
+__atanh (double x)
 {
-#ifdef _IEEE_LIBM
-	return __ieee754_atanh(x);
-#else
-	double z,y;
-	z = __ieee754_atanh(x);
-	if(_LIB_VERSION == _IEEE_ || __isnan(x)) return z;
-	y = fabs(x);
-	if(y>=1.0) {
-	    if(y>1.0)
-	        return __kernel_standard(x,x,30); /* atanh(|x|>1) */
-	    else
-	        return __kernel_standard(x,x,31); /* atanh(|x|==1) */
-	} else
-	    return z;
-#endif
+  if (__builtin_expect (fabs (x) >= 1.0, 0) && _LIB_VERSION != _IEEE_)
+    return __kernel_standard (x, x,
+			      fabs (x) > 1.0
+			      ? 30		/* atanh(|x|>1) */
+			      : 31);		/* atanh(|x|==1) */
+
+  return __ieee754_atanh (x);
 }
 weak_alias (__atanh, atanh)
 #ifdef NO_LONG_DOUBLE