lib/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2025-07-30 22:43:12 +03:00
Code Activity

Optimize libm

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

96
math/w_scalbl.c
View File

@ -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)
{
#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
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)
{
return (__builtin_expect (_LIB_VERSION == _SVID_, 0)
? sysv_scalbl (x, fn)
: __ieee754_scalbl (x, fn));
}
weak_alias (__scalbl, scalbl)