/*
 * 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.
 */

#include "quad.h"

#ifdef __sparcv9
#define _Q_cmp  _Qp_cmp
#endif

/*
 * _Q_cmp(x, y) returns the condition code that would result from
 * fcmpq *x, *y (and raises the same exceptions).
 */
enum fcc_type
_Q_cmp(const union longdouble *x, const union longdouble *y)
{
        unsigned int    xm, ym, fsr;

        if (QUAD_ISNAN(*x) || QUAD_ISNAN(*y)) {
                if ((QUAD_ISNAN(*x) && !(x->l.msw & 0x8000)) ||
                    (QUAD_ISNAN(*y) && !(y->l.msw & 0x8000))) {
                        /* snan, signal invalid */
                        __quad_getfsrp(&fsr);
                        if (fsr & FSR_NVM) {
                                __quad_fcmpq(x, y, &fsr);
                                return ((fsr >> 10) & 3);
                        } else {
                                fsr = (fsr & ~FSR_CEXC) | FSR_NVA | FSR_NVC;
                                __quad_setfsrp(&fsr);
                        }
                }
                return (fcc_unordered);
        }

        /* ignore sign of zero */
        xm = x->l.msw;
        if (QUAD_ISZERO(*x))
                xm &= 0x7fffffff;
        ym = y->l.msw;
        if (QUAD_ISZERO(*y))
                ym &= 0x7fffffff;

        if ((xm ^ ym) & 0x80000000)     /* x and y have opposite signs */
                return ((ym & 0x80000000)? fcc_greater : fcc_less);

        if (xm & 0x80000000) {
                if (xm > ym)
                        return (fcc_less);
                if (xm < ym)
                        return (fcc_greater);
                if (x->l.frac2 > y->l.frac2)
                        return (fcc_less);
                if (x->l.frac2 < y->l.frac2)
                        return (fcc_greater);
                if (x->l.frac3 > y->l.frac3)
                        return (fcc_less);
                if (x->l.frac3 < y->l.frac3)
                        return (fcc_greater);
                if (x->l.frac4 > y->l.frac4)
                        return (fcc_less);
                if (x->l.frac4 < y->l.frac4)
                        return (fcc_greater);
                return (fcc_equal);
        }
        if (xm < ym)
                return (fcc_less);
        if (xm > ym)
                return (fcc_greater);
        if (x->l.frac2 < y->l.frac2)
                return (fcc_less);
        if (x->l.frac2 > y->l.frac2)
                return (fcc_greater);
        if (x->l.frac3 < y->l.frac3)
                return (fcc_less);
        if (x->l.frac3 > y->l.frac3)
                return (fcc_greater);
        if (x->l.frac4 < y->l.frac4)
                return (fcc_less);
        if (x->l.frac4 > y->l.frac4)
                return (fcc_greater);
        return (fcc_equal);
}