minix/common/lib/libc/arch/vax/gen/urem.S
Lionel Sambuc f14fb60209 Libraries updates and cleanup
* Updating common/lib
 * Updating lib/csu
 * Updating lib/libc
 * Updating libexec/ld.elf_so
 * Corrected test on __minix in featuretest to actually follow the
   meaning of the comment.
 * Cleaned up _REENTRANT-related defintions.
 * Disabled -D_REENTRANT for libfetch
 * Removing some unneeded __NBSD_LIBC defines and tests

Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
2013-01-14 11:36:26 +01:00

92 lines
3.1 KiB
ArmAsm

/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Donn Seeley at UUNET Technologies, Inc.
*
* 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>
/* .asciz "@(#)urem.s 8.1 (Berkeley) 6/4/93" */
RCSID("$NetBSD: urem.S,v 1.3 2011/01/25 04:45:28 matt Exp $")
/*
* Unsigned modulus, PCC flavor.
* urem() takes an ordinary dividend/divisor pair;
* aurem() takes a pointer to a dividend and an ordinary divisor.
*/
#define DIVIDEND 4(%ap)
#define DIVISOR 8(%ap)
ASENTRY(__urem,0)
movl DIVISOR,%r2
jlss Leasy # big divisor: settle by comparison
movl DIVIDEND,%r0
jlss Lhard # big dividend: need extended division
divl3 %r2,%r0,%r1 # small divisor and dividend: signed modulus
mull2 %r2,%r1
subl2 %r1,%r0
ret
Lhard:
clrl %r1
ediv %r2,%r0,%r1,%r0
ret
Leasy:
subl3 %r2,DIVIDEND,%r0
jcc Ldifference # if divisor goes in once, return difference
movl DIVIDEND,%r0 # if divisor is bigger, return dividend
Ldifference:
ret
END(__urem)
ASENTRY(__aurem,0)
movl DIVIDEND,%r3
movl DIVISOR,%r2
jlss La_easy # big divisor: settle by comparison
movl (%r3),%r0
jlss La_hard # big dividend: need extended division
divl3 %r2,%r0,%r1 # small divisor and dividend: signed modulus
mull2 %r2,%r1
subl2 %r1,%r0
movl %r0,(%r3) # leave the value of the assignment in %r0
ret
La_hard:
clrl %r1
ediv %r2,%r0,%r1,%r0
movl %r0,(%r3)
ret
La_easy:
subl3 %r2,(%r3),%r0
jcs La_dividend # if divisor is bigger, leave dividend alone
movl %r0,(%r3) # if divisor goes in once, store difference
ret
La_dividend:
movl (%r3),%r0
ret
END(__aurem)