diff options
Diffstat (limited to 'lib/libc/arch/vax/gen/urem.S')
| -rw-r--r-- | lib/libc/arch/vax/gen/urem.S | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/lib/libc/arch/vax/gen/urem.S b/lib/libc/arch/vax/gen/urem.S new file mode 100644 index 00000000000..615b065ace4 --- /dev/null +++ b/lib/libc/arch/vax/gen/urem.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 "@(#)urem.s 8.1 (Berkeley) 6/4/93" */ + .asciz "$NetBSD: urem.S,v 1.1 1995/04/17 12:23:48 ragge Exp $" +#endif /* LIBC_SCCS and not lint */ + +#include "DEFS.h" + +/* + * 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 + +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 |