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authorUlrich Drepper <drepper@gmail.com>2011-10-12 11:27:51 -0400
committerUlrich Drepper <drepper@gmail.com>2011-10-12 11:27:51 -0400
commit0ac5ae2335292908f39031b1ea9fe8edce433c0f (patch)
treef9d26c8abc0de39d18d4c13e70f6022cdc6b461f /math/w_scalb.c
parenta843a204a3e8a0dd53584dad3668771abaec84ac (diff)
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Optimize libm
libm is now somewhat integrated with gcc's -ffinite-math-only option and lots of the wrapper functions have been optimized.
Diffstat (limited to 'math/w_scalb.c')
-rw-r--r--math/w_scalb.c94
1 files changed, 43 insertions, 51 deletions
diff --git a/math/w_scalb.c b/math/w_scalb.c
index 830f387..91f3658 100644
--- a/math/w_scalb.c
+++ b/math/w_scalb.c
@@ -1,62 +1,54 @@
-/* @(#)w_scalb.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_scalb.c,v 1.6 1995/05/10 20:49:48 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 scalb(double x, double fn) is provide for
- * passing various standard test suite. One
- * should use scalbn() 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
- double __scalb(double x, int fn) /* wrapper scalb */
-#else
- double __scalb(double x, double fn) /* wrapper scalb */
-#endif
-#else
- double __scalb(x,fn) /* wrapper scalb */
-#ifdef _SCALB_INT
- double x; int fn;
-#else
- double x,fn;
-#endif
-#endif
+static double
+__attribute__ ((noinline))
+sysv_scalb (double x, double fn)
{
-#ifdef _IEEE_LIBM
- return __ieee754_scalb(x,fn);
-#else
- double z;
- z = __ieee754_scalb(x,fn);
- if(_LIB_VERSION != _SVID_) return z;
- if(!(__finite(z)||__isnan(z))&&__finite(x)) {
- return __kernel_standard(x,(double)fn,32); /* scalb overflow */
- }
- if(z==0.0&&z!=x) {
- return __kernel_standard(x,(double)fn,33); /* scalb underflow */
- }
-#ifndef _SCALB_INT
- if(!__finite(fn)) __set_errno (ERANGE);
-#endif
- return z;
-#endif
+ double z = __ieee754_scalb (x, fn);
+
+ if (__builtin_expect (__isinf (z), 0))
+ {
+ if (__finite (x))
+ return __kernel_standard (x, fn, 32); /* scalb overflow */
+ else
+ __set_errno (ERANGE);
+ }
+ else if (__builtin_expect (z == 0.0, 0) && z != x)
+ return __kernel_standard (x, fn, 33); /* scalb underflow */
+
+ return z;
+}
+
+
+/* Wrapper scalb */
+double
+__scalb (double x, double fn)
+{
+ return (__builtin_expect (_LIB_VERSION == _SVID_, 0)
+ ? sysv_scalb (x, fn)
+ : __ieee754_scalb (x, fn));
}
weak_alias (__scalb, scalb)
#ifdef NO_LONG_DOUBLE