diff options
Diffstat (limited to 'lib/libc/arch/vax/gen/udiv.S')
| -rw-r--r-- | lib/libc/arch/vax/gen/udiv.S | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/lib/libc/arch/vax/gen/udiv.S b/lib/libc/arch/vax/gen/udiv.S new file mode 100644 index 00000000000..dc42f2fe752 --- /dev/null +++ b/lib/libc/arch/vax/gen/udiv.S @@ -0,0 +1,96 @@ +/*- + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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. + */ + +#if defined(LIBC_SCCS) && !defined(lint) + /* .asciz "@(#)udiv.s 8.1 (Berkeley) 6/4/93" */ + .asciz "$NetBSD: udiv.S,v 1.1 1995/04/17 12:23:47 ragge Exp $" +#endif /* LIBC_SCCS and not lint */ + +/* + * Unsigned division, PCC flavor. + * udiv() takes an ordinary dividend/divisor pair; + * audiv() takes a pointer to a dividend and an ordinary divisor. + */ + +#include "DEFS.h" + +#define DIVIDEND 4(ap) +#define DIVISOR 8(ap) + +ASENTRY(udiv,0) + movl DIVISOR,r2 + jlss Leasy # big divisor: settle by comparison + movl DIVIDEND,r0 + jlss Lhard # big dividend: extended division + divl2 r2,r0 # small divisor and dividend: signed division + ret +Lhard: + clrl r1 + ediv r2,r0,r0,r1 + ret +Leasy: + cmpl DIVIDEND,r2 + jgequ Lone # if dividend is as big or bigger, return 1 + clrl r0 # else return 0 + ret +Lone: + movl $1,r0 + ret + +ASENTRY(audiv,0) + movl DIVIDEND,r3 + movl DIVISOR,r2 + jlss La_easy # big divisor: settle by comparison + movl (r3),r0 + jlss La_hard # big dividend: extended division + divl2 r2,r0 # small divisor and dividend: signed division + movl r0,(r3) # leave the value of the assignment in r0 + ret +La_hard: + clrl r1 + ediv r2,r0,r0,r1 + movl r0,(r3) + ret +La_easy: + cmpl (r3),r2 + jgequ La_one # if dividend is as big or bigger, return 1 + clrl r0 # else return 0 + clrl (r3) + ret +La_one: + movl $1,r0 + movl r0,(r3) + ret |