64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/*-
|
|
* 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 <float.h>
|
|
#include <openlibm_math.h>
|
|
|
|
#include "fpmath.h"
|
|
#include "math_private.h"
|
|
|
|
#if LDBL_MAX_EXP != 0x4000
|
|
#error "Unsupported long double format"
|
|
#endif
|
|
|
|
OLM_DLLEXPORT long double
|
|
frexpl(long double x, int *ex)
|
|
{
|
|
union IEEEl2bits u;
|
|
|
|
u.e = x;
|
|
switch (u.bits.exp) {
|
|
case 0: /* 0 or subnormal */
|
|
if ((u.bits.manl | u.bits.manh) == 0) {
|
|
*ex = 0;
|
|
} else {
|
|
u.e *= 0x1.0p514;
|
|
*ex = u.bits.exp - 0x4200;
|
|
u.bits.exp = 0x3ffe;
|
|
}
|
|
break;
|
|
case 0x7fff: /* infinity or NaN; value of *ex is unspecified */
|
|
break;
|
|
default: /* normal */
|
|
*ex = u.bits.exp - 0x3ffe;
|
|
u.bits.exp = 0x3ffe;
|
|
break;
|
|
}
|
|
return (u.e);
|
|
}
|