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, 61 insertions, 54 deletions

diff --git a/math/w_powl.c b/math/w_powl.c
index 0bb09518d5..1ad581ad94 100644
--- a/math/w_powl.c
+++ b/math/w_powl.c
@@ -1,68 +1,75 @@
-/* w_powl.c -- long double version of w_pow.c.
- * Conversion to long double by Ulrich Drepper,
- * Cygnus Support, drepper@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.
 
-/*
- * wrapper powl(x,y) return x**y
- */
+   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.
+
+   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__
-	long double __powl(long double x, long double y)/* wrapper powl */
-#else
-	long double __powl(x,y)			/* wrapper powl */
-	long double x,y;
-#endif
+/* wrapper powl */
+long double
+__powl (long double x, long double y)
 {
-#ifdef _IEEE_LIBM
-	return  __ieee754_powl(x,y);
-#else
-	long double z;
-	z=__ieee754_powl(x,y);
-	if(_LIB_VERSION == _IEEE_|| __isnanl(y)) return z;
-	if(__isnanl(x)) {
-	    if(y==0.0)
-	        return __kernel_standard(x,y,242); /* pow(NaN,0.0) */
-	    else
-		return z;
-	}
-	if(x==0.0) {
-	    if(y==0.0)
-	        return __kernel_standard(x,y,220); /* pow(0.0,0.0) */
-	    if(__finitel(y)&&y<0.0) {
-	      if (signbit (x) && signbit (z))
-	        return __kernel_standard(x,y,223); /* pow(-0.0,negative) */
+  long double z = __ieee754_powl (x, y);
+  if (__builtin_expect (!__finitel (z), 0))
+    {
+      if (_LIB_VERSION != _IEEE_)
+	{
+	  if (__isnanl (x))
+	    {
+	      if (y == 0.0L)
+		/* pow(NaN,0.0) */
+		return __kernel_standard (x, y, 242);
+	    }
+	  else if (__finitel (x) && __finitel (y))
+	    {
+	      if (__isnanl (z))
+		/* pow neg**non-int */
+		return __kernel_standard (x, y, 224);
+	      else if (x == 0.0L && y < 0.0L)
+		{
+		  if (signbit (x) && signbit (z))
+		    /* pow(-0.0,negative) */
+		    return __kernel_standard (x, y, 223);
+		  else
+		    /* pow(+0.0,negative) */
+		    return __kernel_standard (x, y, 243);
+		}
 	      else
-	        return __kernel_standard(x,y,243); /* pow(+0.0,negative) */
+		/* pow overflow */
+		return __kernel_standard (x, y, 221);
 	    }
-	    return z;
 	}
-	if(!__finitel(z)) {
-	    if(__finitel(x)&&__finitel(y)) {
-	        if(__isnanl(z))
-	            return __kernel_standard(x,y,224); /* pow neg**non-int */
-	        else
-	            return __kernel_standard(x,y,221); /* pow overflow */
-	    }
+    }
+  else if (__builtin_expect (z == 0.0L, 0) && __finitel (x) && __finitel (y)
+	   && _LIB_VERSION != _IEEE_)
+    {
+      if (x == 0.0L)
+	{
+	  if (y == 0.0L)
+	    /* pow(0.0,0.0) */
+	    return __kernel_standard (x, y, 220);
 	}
-	if(z==0.0&&__finitel(x)&&__finitel(y))
-	    return __kernel_standard(x,y,222); /* pow underflow */
-	return z;
-#endif
+      else
+	/* pow underflow */
+	return __kernel_standard (x, y, 222);
+    }
+
+  return z;
 }
 weak_alias (__powl, powl)