/*
* 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
* or http://www.opensolaris.org/os/licensing.
* 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_qtox(x) returns (long)*x.
*/
long
_Qp_qtox(const union longdouble *x)
{
long i, round;
unsigned int xm, fsr;
xm = x->l.msw & 0x7fffffff;
__quad_getfsrp(&fsr);
/* handle nan, inf, and out-of-range cases */
if (xm >= 0x403e0000) {
if (x->l.msw == 0xc03e0000 && x->l.frac2 == 0 &&
(x->l.frac3 & 0xfffe0000) == 0) {
/* return largest negative 64 bit int */
i = 0x8000000000000000ul;
if ((x->l.frac3 & 0x1ffff) | x->l.frac4) {
/* signal inexact */
if (fsr & FSR_NXM) {
__quad_fqtox(x, &i);
} else {
fsr = (fsr & ~FSR_CEXC) | FSR_NXA |
FSR_NXC;
__quad_setfsrp(&fsr);
}
}
return (i);
}
i = ((x->l.msw & 0x80000000)? 0x8000000000000000ul :
0x7fffffffffffffffl);
if (fsr & FSR_NVM) {
__quad_fqtox(x, &i);
} else {
fsr = (fsr & ~FSR_CEXC) | FSR_NVA | FSR_NVC;
__quad_setfsrp(&fsr);
}
return (i);
}
if (xm < 0x3fff0000) {
i = 0l;
if (xm | x->l.frac2 | x->l.frac3 | x->l.frac4) {
/* signal inexact */
if (fsr & FSR_NXM) {
__quad_fqtox(x, &i);
} else {
fsr = (fsr & ~FSR_CEXC) | FSR_NXA | FSR_NXC;
__quad_setfsrp(&fsr);
}
}
return (i);
}
/* now x is in the range of 64 bit int */
i = 0x4000000000000000l | ((long) (xm & 0xffff) << 46) |
((long) x->l.frac2 << 14) | (x->l.frac3 >> 18);
round = i & ((1l << (0x403d - (xm >> 16))) - 1);
i >>= (0x403d - (xm >> 16));
if (x->l.msw & 0x80000000)
i = -i;
if (round | (x->l.frac3 & 0x3ffff) | x->l.frac4) {
/* signal inexact */
if (fsr & FSR_NXM) {
__quad_fqtox(x, &i);
} else {
fsr = (fsr & ~FSR_CEXC) | FSR_NXA | FSR_NXC;
__quad_setfsrp(&fsr);
}
}
return (i);
}