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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/e_scalbf.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/e_scalbf.c')
-rw-r--r--math/e_scalbf.c109
1 files changed, 50 insertions, 59 deletions
diff --git a/math/e_scalbf.c b/math/e_scalbf.c
index 3caa535b12..61847d9a56 100644
--- a/math/e_scalbf.c
+++ b/math/e_scalbf.c
@@ -1,68 +1,59 @@
-/* e_scalbf.c -- float version of e_scalb.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: e_scalbf.c,v 1.3 1995/05/10 20:46:12 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.
+
+ 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__
- float __ieee754_scalbf(float x, int fn)
-#else
- float __ieee754_scalbf(x,fn)
- float x; int fn;
-#endif
-#else
-#ifdef __STDC__
- float __ieee754_scalbf(float x, float fn)
-#else
- float __ieee754_scalbf(x,fn)
- float x, fn;
-#endif
-#endif
+
+static float
+__attribute__ ((noinline))
+invalid_fn (float x, float fn)
{
-#ifdef _SCALB_INT
- return __scalbnf(x,fn);
-#else
- if (__isnanf(x)||__isnanf(fn)) return x*fn;
- if (!__finitef(fn)) {
- if(fn>(float)0.0) return x*fn;
- else if (x == 0)
- return x;
- else if (!__finitef (x))
- {
-# ifdef FE_INVALID
- feraiseexcept (FE_INVALID);
-# endif
- return __nanf ("");
- }
- else return x/(-fn);
- }
- if (__rintf(fn)!=fn)
- {
-# ifdef FE_INVALID
- feraiseexcept (FE_INVALID);
-# endif
- return __nanf ("");
- }
- if ( fn > (float)65000.0) return __scalbnf(x, 65000);
- if (-fn > (float)65000.0) return __scalbnf(x,-65000);
- return __scalbnf(x,(int)fn);
-#endif
+ if (__rintf (fn) != fn)
+ {
+ feraiseexcept (FE_INVALID);
+ return __nan ("");
+ }
+ else if (fn > 65000.0f)
+ return __scalbnf (x, 65000);
+ else
+ return __scalbnf (x,-65000);
+}
+
+
+float
+__ieee754_scalbf (float x, float fn)
+{
+ if (__builtin_expect (__isnanf (x), 0))
+ return x * fn;
+ if (__builtin_expect (!__finitef (fn), 0))
+ {
+ if (__isnanf (fn) || fn > 0.0f)
+ return x * fn;
+ if (x == 0.0f)
+ return x;
+ return x / -fn;
+ }
+ if (__builtin_expect ((float) (int) fn != fn, 0))
+ return invalid_fn (x, fn);
+
+ return __scalbnf (x, (int) fn);
}
+strong_alias (__ieee754_scalbf, __scalbf_finite)