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-rw-r--r--math/e_scalbl.c114
1 files changed, 49 insertions, 65 deletions
diff --git a/math/e_scalbl.c b/math/e_scalbl.c
index ad3595c0c5..6b36b71229 100644
--- a/math/e_scalbl.c
+++ b/math/e_scalbl.c
@@ -1,75 +1,59 @@
-/* e_scalbl.c -- long double version of s_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.
-/*
- * __ieee754_scalbl(x, 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 <fenv.h>
#include <math.h>
#include <math_private.h>
-#ifdef _SCALB_INT
-#ifdef __STDC__
- long double __ieee754_scalbl(long double x, int fn)
-#else
- long double __ieee754_scalbl(x,fn)
- long double x; int fn;
-#endif
-#else
-#ifdef __STDC__
- long double __ieee754_scalbl(long double x, long double fn)
-#else
- long double __ieee754_scalbl(x,fn)
- long double x, fn;
-#endif
-#endif
+
+static long double
+__attribute__ ((noinline))
+invalid_fn (long double x, long double fn)
+{
+ if (__rintl (fn) != fn)
+ {
+ feraiseexcept (FE_INVALID);
+ return __nan ("");
+ }
+ else if (fn > 65000.0L)
+ return __scalbnl (x, 65000);
+ else
+ return __scalbnl (x,-65000);
+}
+
+
+long double
+__ieee754_scalbl (long double x, long double fn)
{
-#ifdef _SCALB_INT
- return __scalbnl(x,fn);
-#else
- if (__isnanl(x)||__isnanl(fn)) return x*fn;
- if (!__finitel(fn)) {
- if(fn>0.0) return x*fn;
- else if (x == 0)
- return x;
- else if (!__finitel (x))
- {
-# ifdef FE_INVALID
- feraiseexcept (FE_INVALID);
-# endif
- return __nanl ("");
- }
- else return x/(-fn);
- }
- if (__rintl(fn)!=fn)
- {
-# ifdef FE_INVALID
- feraiseexcept (FE_INVALID);
-# endif
- return __nanl ("");
- }
- if ( fn > 65000.0) return __scalbnl(x, 65000);
- if (-fn > 65000.0) return __scalbnl(x,-65000);
- return __scalbnl(x,(int)fn);
-#endif
+ if (__builtin_expect (__isnanl (x), 0))
+ return x * fn;
+ if (__builtin_expect (!__finitel (fn), 0))
+ {
+ if (__isnanl (fn) || fn > 0.0L)
+ return x * fn;
+ if (x == 0.0L)
+ return x;
+ return x / -fn;
+ }
+ if (__builtin_expect ((long double) (int) fn != fn, 0))
+ return invalid_fn (x, fn);
+
+ return __scalbnl (x, (int) fn);
}
+strong_alias (__ieee754_scalbl, __scalbl_finite)