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, 42 insertions, 54 deletions

diff --git a/math/w_scalbl.c b/math/w_scalbl.c
index eb118b19b7..33fc725e5f 100644
--- a/math/w_scalbl.c
+++ b/math/w_scalbl.c
@@ -1,65 +1,53 @@
-/* w_scalbl.c -- long double version of w_scalb.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.
 
-#if defined(LIBM_SCCS) && !defined(lint)
-static char rcsid[] = "$NetBSD: $";
-#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 scalbl(long double x, long double fn) is provide for
- * passing various standard test suite. One
- * should use scalbnl() instead.
- */
+   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 <errno.h>
 #include <math.h>
 #include <math_private.h>
 
-#include <errno.h>
 
-#ifdef __STDC__
-#ifdef _SCALB_INT
-	long double __scalbl(long double x, int fn)	/* wrapper scalbl */
-#else
-	long double __scalbl(long double x, long double fn)/* wrapper scalbl */
-#endif
-#else
-	long double __scalbl(x,fn)			/* wrapper scalbl */
-#ifdef _SCALB_INT
-	long double x; int fn;
-#else
-	long double x,fn;
-#endif
-#endif
+static long double
+__attribute__ ((noinline))
+sysv_scalbl (long double x, long double fn)
+{
+  long double z = __ieee754_scalbl (x, fn);
+
+  if (__builtin_expect (__isinfl (z), 0))
+    {
+      if (__finitel (x))
+	return __kernel_standard (x, fn, 232); /* scalb overflow */
+      else
+	__set_errno (ERANGE);
+    }
+  else if (__builtin_expect (z == 0.0L, 0) && z != x)
+    return __kernel_standard (x, fn, 233); /* scalb underflow */
+
+  return z;
+}
+
+
+/* Wrapper scalbl */
+long double
+__scalbl (long double x, long double fn)
 {
-#ifdef _IEEE_LIBM
-	return __ieee754_scalbl(x,fn);
-#else
-	long double z;
-	z = __ieee754_scalbl(x,fn);
-	if(_LIB_VERSION != _SVID_) return z;
-	if(!(__finitel(z)||__isnanl(z))&&__finitel(x)) {
-	    return __kernel_standard(x,(double)fn,232); /* scalb overflow */
-	}
-	if(z==0.0&&z!=x) {
-	    return __kernel_standard(x,(double)fn,233); /* scalb underflow */
-	}
-#ifndef _SCALB_INT
-	if(!__finitel(fn)) __set_errno (ERANGE);
-#endif
-	return z;
-#endif
+  return (__builtin_expect (_LIB_VERSION == _SVID_, 0)
+	  ? sysv_scalbl (x, fn)
+	  : __ieee754_scalbl (x, fn));
 }
 weak_alias (__scalbl, scalbl)