_Qp_xtoq.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1994-1997, by Sun Microsystems, Inc.
* All rights reserved.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include "quad.h"
/*
* _Qp_xtoq(pz, x) sets *pz = (long double)x.
*/
void
{
unsigned int s, e;
/* extract the sign */
s = 0;
if (x < 0) {
if ((unsigned long) x == 0x8000000000000000ul) {
/* largest negative 64 bit int */
Z.l.msw = 0xc03e0000;
QUAD_RETURN(Z);
}
x = -x;
s = 0x80000000;
} else if (x == 0) {
QUAD_RETURN(Z);
}
/* find the most significant bit */
for (e = 62; (x & (1l << e)) == 0; e--)
;
if (e > 48) {
Z.l.frac2 = (unsigned long) x >> (e - 48);
Z.l.frac3 = (unsigned long) x << (80 - e);
} else if (e > 16) {
Z.l.frac2 = (unsigned long) x << (48 - e);
Z.l.frac3 = 0;
} else {
}
Z.l.frac4 = 0;
QUAD_RETURN(Z);
}