/*      $NetBSD: mulsi3.S,v 1.5 2020/03/09 08:29:11 rin Exp $   */

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <machine/asm.h>

#if defined(LIBC_SCCS) && !defined(lint)
#if 0
        RCSID("from: @(#)mulsi3.s       5.1 (Berkeley) 6/7/90")
#else
        RCSID("$NetBSD: mulsi3.S,v 1.5 2020/03/09 08:29:11 rin Exp $")
#endif
#endif /* LIBC_SCCS and not lint */

/* int * int */
ENTRY(__mulsi3)
#ifndef __mc68010__
        movel   4(%sp),%d0
        mulsl   8(%sp),%d0
#else
        movew   6(%sp), %d0
        movel   %d0, %a0        | save B
        muluw   8(%sp), %d0     | %d0 holds B * C
        movew   10(%sp), %d1
        movel   %d1, %a1        | save D
        muluw   4(%sp), %d1     | %d1 holds A * D
        addw    %d1, %d0        | %d0 holds (B * C) + (A * D)
        swap    %d0
        clrw    %d0             | %d0 holds ((B * C) + (A * D)) << 16
        exg     %a0, %d0        | restore B
        movel   %a1, %d1        | restore D
        muluw   %d1, %d0        | %d0 holds B * D
        addl    %a0, %d0        | final result
#endif /* __mc68010__ */
        rts
END(__mulsi3)