Optimize libm

[thirdparty/glibc.git] / math / w_atanhf.c

diff --git a/math/w_atanhf.c b/math/w_atanhf.c
index 41dd2ac33bc609937f676799c7d9f2375f34c4aa..fd1dbaeee359bfe22ebda1abd60b2b55cf9b6b98 100644 (file)
--- a/math/w_atanhf.c
+++ b/math/w_atanhf.c
@@ -1,53 +1,36 @@
-/* w_atanhf.c -- float version of w_atanh.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_atanhf.c,v 1.3 1995/05/10 20:48:45 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 atanhf(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__
-       float __atanhf(float x)         /* wrapper atanhf */
-#else
-       float __atanhf(x)                       /* wrapper atanhf */
-       float x;
-#endif
+/* wrapper atanhf */
+float
+__atanhf (float x)
 {
-#ifdef _IEEE_LIBM
-       return __ieee754_atanhf(x);
-#else
-       float z,y;
-       z = __ieee754_atanhf(x);
-       if(_LIB_VERSION == _IEEE_ || __isnanf(x)) return z;
-       y = fabsf(x);
-       if(y>=(float)1.0) {
-           if(y>(float)1.0)
-               /* atanhf(|x|>1) */
-               return (float)__kernel_standard((double)x,(double)x,130);
-           else 
-               /* atanhf(|x|==1) */
-               return (float)__kernel_standard((double)x,(double)x,131);
-       } else
-           return z;
-#endif
+  if (__builtin_expect (fabsf (x) >= 1.0f, 0) && _LIB_VERSION != _IEEE_)
+    return __kernel_standard_f (x, x,
+                               fabsf (x) > 1.0f
+                               ? 130           /* atanh(|x|>1) */
+                               : 131);         /* atanh(|x|==1) */
+
+  return __ieee754_atanhf (x);
 }
 weak_alias (__atanhf, atanhf)