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Implement frexpl.

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This commit is contained in:
David Schultz 2005-03-07 04:54:51 +00:00
parent f8a40fca14
commit e0fe8e4440
1 changed files with 62 additions and 0 deletions
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lib/msun/src/s_frexpl.c Normal file
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/*-
* 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.
*
* $FreeBSD$
*/
#include <float.h>
#include <math.h>
#include "fpmath.h"
#if LDBL_MAX_EXP != 0x4000
#error "Unsupported long double format"
#endif
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);
}