common/m9x/nexttoward.c

25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis/*
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * CDDL HEADER START
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis *
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * The contents of this file are subject to the terms of the
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Common Development and Distribution License (the "License").
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * You may not use this file except in compliance with the License.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis *
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * or http://www.opensolaris.org/os/licensing.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * See the License for the specific language governing permissions
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * and limitations under the License.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis *
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner]
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis *
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * CDDL HEADER END
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis/*
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis/*
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Use is subject to license terms.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#pragma weak nexttoward = __nexttoward
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis/*
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * nexttoward(x, y) delivers the next representable number after x
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * in the direction of y.  If x and y are both zero, the result is
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * zero with the same sign as y.  If either x or y is NaN, the result
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * is NaN.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis *
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * If x != y and the result is infinite, overflow is raised; if
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * x != y and the result is subnormal or zero, underflow is raised.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * (This is wrong, but it's what C99 apparently wants.)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#include "libm.h"
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#if defined(__sparc)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtisstatic union {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    unsigned i[2];
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    double d;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis} C[] = {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    0x00100000, 0,
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    0x7fe00000, 0,
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    0x7fffffff, 0xffffffff
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis};
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#define tiny    C[0].d
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#define huge    C[1].d
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#define qnan    C[2].d
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtisenum fcc_type {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    fcc_equal = 0,
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    fcc_less = 1,
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    fcc_greater = 2,
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    fcc_unordered = 3
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis};
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#ifdef __sparcv9
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#define _Q_cmp  _Qp_cmp
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#endif
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtisextern enum fcc_type _Q_cmp(const long double *, const long double *);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtisdouble
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis__nexttoward(double x, long double y) {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    union {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        unsigned i[2];
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        double d;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    } xx;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    union {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        unsigned i[4];
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        long double q;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    } yy;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    long double lx;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    unsigned hx;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    volatile double dummy;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    enum fcc_type rel;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    /*
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis     * It would be somewhat more efficient to check for NaN and
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis     * zero operands before converting x to long double and then
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis     * to code the comparison in line rather than calling _Q_cmp.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis     * However, since this code probably won't get used much,
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis     * I'm opting in favor of simplicity instead.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis     */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    lx = xx.d = x;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    hx = (xx.i[0] & ~0x80000000) | xx.i[1];
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    /* check for each of four possible orderings */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    rel = _Q_cmp(&lx, &y);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    if (rel == fcc_unordered)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        return (qnan);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    if (rel == fcc_equal) {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        if (hx == 0) {  /* x is zero; return zero with y's sign */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            yy.q = y;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            xx.i[0] = yy.i[0];
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            return (xx.d);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        }
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        return (x);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    }
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    if (rel == fcc_less) {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        if (hx == 0) {  /* x is zero */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            xx.i[0] = 0;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            xx.i[1] = 0x00000001;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        } else if ((int)xx.i[0] >= 0) { /* x is positive */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            if (++xx.i[1] == 0)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis                xx.i[0]++;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        } else {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            if (xx.i[1]-- == 0)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis                xx.i[0]--;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        }
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    } else {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        if (hx == 0) {  /* x is zero */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            xx.i[0] = 0x80000000;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            xx.i[1] = 0x00000001;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        } else if ((int)xx.i[0] >= 0) { /* x is positive */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            if (xx.i[1]-- == 0)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis                xx.i[0]--;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        } else {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            if (++xx.i[1] == 0)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis                xx.i[0]++;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        }
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    }
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    /* raise exceptions as needed */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    hx = xx.i[0] & ~0x80000000;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    if (hx == 0x7ff00000) {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        dummy = huge;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        dummy *= huge;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    } else if (hx < 0x00100000) {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        dummy = tiny;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        dummy *= tiny;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    }
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    return (xx.d);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis}
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#elif defined(__x86)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtisstatic union {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    unsigned i[2];
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    double d;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis} C[] = {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    0, 0x00100000,
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    0, 0x7fe00000,
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis};
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#define tiny    C[0].d
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#define huge    C[1].d
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtisdouble
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis__nexttoward(double x, long double y) {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    union {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        unsigned i[2];
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        double d;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    } xx;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    unsigned hx;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    long double lx;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    volatile double dummy;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    lx = xx.d = x;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    hx = (xx.i[1] & ~0x80000000) | xx.i[0];
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    /* check for each of four possible orderings */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    if (isunordered(lx, y))
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        return ((double) (lx + y));
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    if (lx == y)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        return ((double) y);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    if (lx < y) {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        if (hx == 0) {  /* x is zero */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            xx.i[0] = 0x00000001;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            xx.i[1] = 0;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        } else if ((int)xx.i[1] >= 0) { /* x is positive */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            if (++xx.i[0] == 0)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis                xx.i[1]++;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        } else {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            if (xx.i[0]-- == 0)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis                xx.i[1]--;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        }
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    } else {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        if (hx == 0) {  /* x is zero */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            xx.i[0] = 0x00000001;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            xx.i[1] = 0x80000000;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        } else if ((int)xx.i[1] >= 0) { /* x is positive */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            if (xx.i[0]-- == 0)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis                xx.i[1]--;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        } else {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis            if (++xx.i[0] == 0)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis                xx.i[1]++;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        }
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    }
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    /* raise exceptions as needed */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    hx = xx.i[1] & ~0x80000000;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    if (hx == 0x7ff00000) {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        dummy = huge;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        dummy *= huge;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    } else if (hx < 0x00100000) {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        dummy = tiny;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis        dummy *= tiny;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    }
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis    return (xx.d);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis}
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#else
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#error Unknown architecture
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#endif