70 lines
2.6 KiB
ArmAsm
70 lines
2.6 KiB
ArmAsm
/* $NetBSD: urem.s,v 1.2 1994/10/26 08:03:37 cgd Exp $ */
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/*-
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* Copyright (c) 1991 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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* Donn Seeley at UUNET Technologies, Inc.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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* @(#)urem.s 5.6 (Berkeley) 4/15/91
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*/
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/*
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* Unsigned modulus, PCC flavor.
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* urem() takes an ordinary dividend/divisor pair;
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*/
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#define DIVIDEND 4(ap)
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#define DIVISOR 8(ap)
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.globl urem
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.align 2
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urem: .word 0x0
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movl 8(ap),r2
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jlss Leasy # big divisor: settle by comparison
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movl 4(ap),r0
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jlss Lhard # big dividend: need extended division
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divl3 r2,r0,r1 # small divisor and dividend: signed modulus
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mull2 r2,r1
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subl2 r1,r0
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ret
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Lhard:
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clrl r1
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ediv r2,r0,r1,r0
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ret
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Leasy:
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subl3 r2,DIVIDEND,r0
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jcc Ldifference # if divisor goes in once, return difference
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movl DIVIDEND,r0 # if divisor is bigger, return dividend
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Ldifference:
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ret
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