84d9c625bf
- Fix for possible unset uid/gid in toproto - Fix for default mtree style - Update libelf - Importing libexecinfo - Resynchronize GCC, mpc, gmp, mpfr - build.sh: Replace params with show-params. This has been done as the make target has been renamed in the same way, while a new target named params has been added. This new target generates a file containing all the parameters, instead of printing it on the console. - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org) get getservbyport() out of the inner loop Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/* $NetBSD: s_scalbnl.c,v 1.9 2013/05/20 19:40:09 joerg Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2011 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Joerg Sonnenberger.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__RCSID("$NetBSD: s_scalbnl.c,v 1.9 2013/05/20 19:40:09 joerg Exp $");
|
|
|
|
#include "namespace.h"
|
|
|
|
#include <float.h>
|
|
#include <math.h>
|
|
#include <machine/ieee.h>
|
|
|
|
#ifdef __HAVE_LONG_DOUBLE
|
|
|
|
#ifdef _LP64
|
|
long double
|
|
scalbnl(long double x, int n)
|
|
{
|
|
return scalblnl(x, n);
|
|
}
|
|
#else
|
|
__strong_alias(_scalbnl, _scalblnl)
|
|
#endif
|
|
|
|
__weak_alias(scalbnl, _scalbnl)
|
|
__weak_alias(scalblnl, _scalblnl)
|
|
__weak_alias(ldexpl, _scalbnl)
|
|
|
|
#if LDBL_MANT_DIG == 64
|
|
#define FROM_UNDERFLOW 0x1p65L
|
|
#define TO_UNDERFLOW 0x1p-65L
|
|
#elif LDBL_MANT_DIG == 113
|
|
#define FROM_UNDERFLOW 0x1p114L
|
|
#define TO_UNDERFLOW 0x1p-114L
|
|
#else
|
|
#error Unsupported long double format
|
|
#endif
|
|
|
|
long double
|
|
scalblnl(long double x, long n)
|
|
{
|
|
union ieee_ext_u u;
|
|
|
|
/* Trivial cases first */
|
|
if (n == 0 || x == 0.0L)
|
|
return x;
|
|
|
|
u.extu_ld = x;
|
|
|
|
/* NaN and infinite don't change either, but trigger exception */
|
|
if (u.extu_ext.ext_exp == EXT_EXP_INFNAN)
|
|
return x + x;
|
|
|
|
/* Protect against integer overflow in calculation of new exponent */
|
|
if (n > LDBL_MAX_EXP - LDBL_MIN_EXP + LDBL_MANT_DIG)
|
|
goto overflow;
|
|
if (n < LDBL_MIN_EXP - LDBL_MAX_EXP - LDBL_MANT_DIG)
|
|
goto underflow;
|
|
|
|
/* Scale denormalized numbers slightly, so that they are normal */
|
|
if (u.extu_ext.ext_exp == 0) {
|
|
u.extu_ld *= FROM_UNDERFLOW;
|
|
n -= LDBL_MANT_DIG + 1;
|
|
}
|
|
|
|
n += u.extu_ext.ext_exp;
|
|
if (n >= LDBL_MAX_EXP + EXT_EXP_BIAS)
|
|
goto overflow;
|
|
/* Positive exponent (incl. bias) means normal result */
|
|
if (n > 0) {
|
|
u.extu_ext.ext_exp = n;
|
|
return u.extu_ld;
|
|
}
|
|
/* Shift the exponent and let the multiply below handle subnormal */
|
|
n += LDBL_MANT_DIG + 1;
|
|
if (n <= 0)
|
|
goto underflow;
|
|
u.extu_ext.ext_exp = n;
|
|
return u.extu_ld * TO_UNDERFLOW;
|
|
|
|
underflow:
|
|
return LDBL_MIN * copysignl(LDBL_MIN, x);
|
|
|
|
overflow:
|
|
return LDBL_MAX * copysignl(LDBL_MAX, x);
|
|
}
|
|
|
|
#endif
|