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Optimize libm

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libm is now somewhat integrated with gcc's -ffinite-math-only option
and lots of the wrapper functions have been optimized.
This commit is contained in:
Ulrich Drepper
2011-10-12 11:27:51 -04:00
parent a843a204a3
commit 0ac5ae2335
270 changed files with 4557 additions and 5634 deletions
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97
math/w_scalbf.c
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@@ -1,66 +1,53 @@
/* w_scalbf.c -- float version of w_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: w_scalbf.c,v 1.3 1995/05/10 20:49:50 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.
/*
* wrapper scalbf(float x, float 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
float __scalbf(float x, int fn) /* wrapper scalbf */
#else
float __scalbf(float x, float fn) /* wrapper scalbf */
#endif
#else
float __scalbf(x,fn) /* wrapper scalbf */
#ifdef _SCALB_INT
float x; int fn;
#else
float x,fn;
#endif
#endif
static float
__attribute__ ((noinline))
sysv_scalbf (float x, float fn)
{
#ifdef _IEEE_LIBM
return __ieee754_scalbf(x,fn);
#else
float z;
z = __ieee754_scalbf(x,fn);
if(_LIB_VERSION != _SVID_) return z;
if(!(__finitef(z)||__isnanf(z))&&__finitef(x)) {
/* scalbf overflow */
return (float)__kernel_standard((double)x,(double)fn,132);
}
if(z==(float)0.0&&z!=x) {
/* scalbf underflow */
return (float)__kernel_standard((double)x,(double)fn,133);
}
#ifndef _SCALB_INT
if(!__finitef(fn)) __set_errno (ERANGE);
#endif
return z;
#endif
float z = __ieee754_scalbf (x, fn);
if (__builtin_expect (__isinff (z), 0))
{
if (__finitef (x))
return __kernel_standard_f (x, fn, 132); /* scalb overflow */
else
__set_errno (ERANGE);
}
else if (__builtin_expect (z == 0.0f, 0) && z != x)
return __kernel_standard_f (x, fn, 133); /* scalb underflow */
return z;
}
/* Wrapper scalbf */
float
__scalbf (float x, float fn)
{
return (__builtin_expect (_LIB_VERSION == _SVID_, 0)
? sysv_scalbf (x, fn)
: __ieee754_scalbf (x, fn));
}
weak_alias (__scalbf, scalbf)