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/* $OpenBSD: s_frexpl.c,v 1.2 2016/09/12 19:47:02 guenther Exp $ */
/*-
* Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
* All rights reserved.
*
* 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 AUTHOR 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 AUTHOR 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.
*
* $FreeBSD: src/lib/msun/src/s_frexpl.c,v 1.1 2005/03/07 04:54:51 das Exp $
*/
#include <sys/types.h>
#include <machine/ieee.h>
#include <float.h>
#include <math.h>
#if LDBL_MAX_EXP != 0x4000
#error "Unsupported long double format"
#endif
long double
frexpl(long double x, int *ex)
{
struct ieee_ext *p = (struct ieee_ext *)&x;
switch (p->ext_exp) {
case 0: /* 0 or subnormal */
if ((p->ext_fracl
#ifdef EXT_FRACLMBITS
| p->ext_fraclm
#endif /* EXT_FRACLMBITS */
#ifdef EXT_FRACHMBITS
| p->ext_frachm
#endif /* EXT_FRACHMBITS */
| p->ext_frach) == 0) {
*ex = 0;
} else {
x *= 0x1.0p514;
*ex = p->ext_exp - 0x4200;
p->ext_exp = 0x3ffe;
}
break;
case 0x7fff: /* infinity or NaN; value of *ex is unspecified */
break;
default: /* normal */
*ex = p->ext_exp - 0x3ffe;
p->ext_exp = 0x3ffe;
break;
}
return x;
}
DEF_STD(frexpl);
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