ashrdi3.c

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/*
 * arch/score/lib/ashrdi3.c
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/module.h>
#include "libgcc.h"

long long __ashrdi3(long long u, word_type b)
{
    DWunion uu, w;
    word_type bm;

    if (b == 0)
        return u;

    uu.ll = u;
    bm = 32 - b;

    if (bm <= 0) {
        /* w.s.high = 1..1 or 0..0 */
        w.s.high =
            uu.s.high >> 31;
        w.s.low = uu.s.high >> -bm;
    } else {
        const unsigned int carries = (unsigned int) uu.s.high << bm;

        w.s.high = uu.s.high >> b;
        w.s.low = ((unsigned int) uu.s.low >> b) | carries;
    }

    return w.ll;
}
EXPORT_SYMBOL(__ashrdi3);