_Q_stoq.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"
#ifdef __sparcv9
/*
* _Qp_stoq(pz, x) sets *pz = (long double)x.
*/
void
#else
/*
* _Qp_stoq(x) returns (long double)x.
*/
union longdouble
_Q_stoq(float x)
#endif /* __sparcv9 */
{
#ifndef __sparcv9
union longdouble z;
#endif
union {
float f;
unsigned int l;
} u;
unsigned int m, f, fsr;
/* extract the exponent */
u.f = x;
m = ((u.l & 0x7f800000) >> 7) + 0x3f800000;
if (m == 0x3f800000) {
/* x is zero or denormal */
if (u.l & 0x7fffff) {
/* x is denormal, normalize it */
m = 0x3f810000;
f = u.l & 0x7fffff;
do {
f <<= 1;
m -= 0x10000;
} while ((f & 0x7f800000) == 0);
u.l = (u.l & 0x80000000) | f;
} else {
m = 0;
}
} else if (m == 0x407f0000) {
/* x is inf or nan */
m = 0x7fff0000;
if ((u.l & 0x3fffff) && (u.l & 0x400000) == 0) {
/* snan, signal invalid */
__quad_fstoq(&x, &Z);
QUAD_RETURN(Z);
} else {
}
u.l |= 0x400000;
}
}
Z.l.frac2 = u.l << 25;
QUAD_RETURN(Z);
}