Return to bcopy.s CVS log

Up to [CSRG BSD Unix] / 43BSDReno / lib / libc / tahoe / string

Annotation of 43BSDReno/lib/libc/tahoe/string/bcopy.s, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1988 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  *
                     19:  * This code is derived from software contributed to Berkeley by
                     20:  * Computer Consoles Inc.
                     21:  */
                     22: 
                     23: #if defined(LIBC_SCCS) && !defined(lint)
                     24:        .asciz "@(#)bcopy.s     1.4 (Berkeley) 6/1/90"
                     25: #endif /* LIBC_SCCS and not lint */
                     26: 
                     27: /* bcopy(from, to, size) */
                     28: #include "DEFS.h"
                     29: 
                     30: ENTRY(bcopy, 0)
                     31:        movl    4(fp),r0
                     32:        movl    8(fp),r1
                     33:        movl    12(fp),r2
                     34:        cmpl    r0,r1
                     35:        bgtru   1f              # normal forward case
                     36:        beql    2f              # equal, nothing to do
                     37:        addl2   r2,r0           # may be overlapping
                     38:        cmpl    r0,r1
                     39:        bgtru   3f
                     40:        subl2   r2,r0           # normal forward case
                     41: 1:
                     42:        movblk
                     43: 2:
                     44:        ret
                     45: 3:
                     46:        addl2   r2,r1           # overlapping, must do backwards
                     47:        subl3   r0,r1,r3
                     48:        movl    r2,r4
                     49:        jbr     5f
                     50: 4:
                     51:        subl2   r3,r0
                     52:        subl2   r3,r1
                     53:        movl    r3,r2
                     54:        movblk
                     55:        subl2   r3,r0
                     56:        subl2   r3,r1
                     57:        subl2   r3,r4
                     58: 5:
                     59:        cmpl    r4,r3
                     60:        jgtr    4b
                     61:        movl    r4,r2
                     62:        subl2   r2,r0
                     63:        subl2   r2,r1
                     64:        movblk
                     65:        ret

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.