From 0ac5ae2335292908f39031b1ea9fe8edce433c0f Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@gmail.com>
Date: Wed, 12 Oct 2011 11:27:51 -0400
Subject: Optimize libm

libm is now somewhat integrated with gcc's -ffinite-math-only option
and lots of the wrapper functions have been optimized.
---
 math/w_sqrtf.c | 60 ++++++++++++++++++++++------------------------------------
 1 file changed, 23 insertions(+), 37 deletions(-)

(limited to 'math/w_sqrtf.c')

diff --git a/math/w_sqrtf.c b/math/w_sqrtf.c
index 854d1cd..fc088b6 100644
--- a/math/w_sqrtf.c
+++ b/math/w_sqrtf.c
@@ -1,47 +1,33 @@
-/* w_sqrtf.c -- float version of w_sqrt.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_sqrtf.c,v 1.3 1995/05/10 20:49:59 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 sqrtf(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 __sqrtf(float x)		/* wrapper sqrtf */
-#else
-	float sqrt(x)			/* wrapper sqrtf */
-	float x;
-#endif
+
+/* wrapper sqrtf */
+float
+__sqrtf (float x)
 {
-#ifdef _IEEE_LIBM
-	return __ieee754_sqrtf(x);
-#else
-	float z;
-	z = __ieee754_sqrtf(x);
-	if(_LIB_VERSION == _IEEE_ || __isnanf(x)) return z;
-	if(x<(float)0.0) {
-	    /* sqrtf(negative) */
-	    return (float)__kernel_standard((double)x,(double)x,126);
-	} else
-	    return z;
-#endif
+  if (__builtin_expect (x < 0.0f, 0) && _LIB_VERSION != _IEEE_)
+    return __kernel_standard_f (x, x, 126); /* sqrt(negative) */
+
+  return __ieee754_sqrtf (x);
 }
 weak_alias (__sqrtf, sqrtf)
-- 
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