69 lines
2.6 KiB
ArmAsm
69 lines
2.6 KiB
ArmAsm
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/* $NetBSD: mulsi3.S,v 1.2 2006/01/05 22:33:34 he Exp $ */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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RCSID("from: @(#)mulsi3.s 5.1 (Berkeley) 6/7/90")
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#else
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RCSID("$NetBSD: mulsi3.S,v 1.2 2006/01/05 22:33:34 he Exp $")
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#endif
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#endif /* LIBC_SCCS and not lint */
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/* int * int */
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ENTRY(__mulsi3)
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#ifndef __mc68010__
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movel %sp@(4),%d0
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mulsl %sp@(8),%d0
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#else
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| NB: this requires that __udivsi3 preserve %a0 and return
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| the modulus in %d1:
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movew %sp@(6), %d0
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movel %d0, %a0 | save B
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muluw %sp@(8), %d0 | %d0 holds B * C
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movew %sp@(10), %d1
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movel %d1, %a1 | save D
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muluw %sp@(4), %d1 | %d1 holds A * D
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addw %d1, %d0 | %d0 holds (B * C) + (A * D)
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swap %d0
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clrw %d0 | %d0 holds ((B * C) + (A * D)) << 16
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exg %a0, %d0 | restore B
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movel %a1, %d1 | restore D
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muluw %d1, %d0 | %d0 holds B * D
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addl %a0, %d0 | final result
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#endif /* __mc68010__ */
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rts
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