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muldi3.s revision 1.1 
      1 /*	$NetBSD: muldi3.s,v 1.1 1996/11/29 23:36:30 is Exp $
      2  *
      3  * Copyright (c) 1996 Ignatios Souvatzis
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *      This product includes software developed by Ignatios Souvatzis
     17  *      for the NetBSD project.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  *
     32  * Slow but small muldi3.
     33  * Beware... the multiplicand is unsigned (but should be enough for
     34  * usage by ufs.c :-)
     35  */
     36 
     37 	.text
     38 	.even
     39 	.globl	___muldi3
     40 ___muldi3:
     41 	movml d2/d3/d4/d5/d6,sp@-	| 0..4 regs, 5 pc, 6..9 parameters
     42 	movml sp@(24),d2-d5
     43 |	movl sp@(24),d2
     44 |	movl sp@(28),d3
     45 |	movl sp@(32),d4
     46 |	movl sp@(36),d5
     47 	movq #0,d0
     48 	movq #0,d1
     49 	movq #63,d6
     50 L4:
     51 	asrl #1,d2
     52 	roxrl #1,d3
     53 	jcc L5
     54 	addl d5,d1
     55 	addxl d4,d0
     56 L5:
     57 	addl d5,d5
     58 	addxl d4,d4
     59 L7:
     60 	dbra d6,L4
     61 	movml sp@+,d2/d3/d4/d5/d6
     62 	rts
     63