101 lines
3.1 KiB
ArmAsm
101 lines
3.1 KiB
ArmAsm
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. 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. 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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#if defined(LIBC_SCCS) && !defined(lint)
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/* .asciz "@(#)udiv.s 8.1 (Berkeley) 6/4/93" */
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.asciz "$NetBSD: udiv.S,v 1.2 2005/12/24 08:33:32 matt Exp $"
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#endif /* LIBC_SCCS and not lint */
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/*
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* Unsigned division, PCC flavor.
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* udiv() takes an ordinary dividend/divisor pair;
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* audiv() takes a pointer to a dividend and an ordinary divisor.
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*/
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#include <machine/asm.h>
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#define DIVIDEND 4(%ap)
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#define DIVISOR 8(%ap)
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#ifdef __ELF__
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ASENTRY(__udiv,0)
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#else
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ASENTRY(udiv,0)
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#endif
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movl DIVISOR,%r2
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jlss Leasy # big divisor: settle by comparison
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movl DIVIDEND,%r0
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jlss Lhard # big dividend: extended division
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divl2 %r2,%r0 # small divisor and dividend: signed division
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ret
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Lhard:
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clrl %r1
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ediv %r2,%r0,%r0,%r1
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ret
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Leasy:
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cmpl DIVIDEND,%r2
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jgequ Lone # if dividend is as big or bigger, return 1
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clrl %r0 # else return 0
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ret
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Lone:
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movl $1,%r0
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ret
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#ifdef __ELF__
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ASENTRY(__audiv,0)
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#else
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ASENTRY(audiv,0)
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#endif
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movl DIVIDEND,%r3
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movl DIVISOR,%r2
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jlss La_easy # big divisor: settle by comparison
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movl (%r3),%r0
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jlss La_hard # big dividend: extended division
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divl2 %r2,%r0 # small divisor and dividend: signed division
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movl %r0,(%r3) # leave the value of the assignment in %r0
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ret
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La_hard:
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clrl %r1
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ediv %r2,%r0,%r0,%r1
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movl %r0,(%r3)
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ret
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La_easy:
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cmpl (%r3),%r2
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jgequ La_one # if dividend is as big or bigger, return 1
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clrl %r0 # else return 0
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clrl (%r3)
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ret
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La_one:
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movl $1,%r0
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movl %r0,(%r3)
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ret
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