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Annotation of 43BSDReno/usr.bin/tn3270/general/vaxbsubs.s, revision 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 the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  *
        !            17:  *     @(#)vaxbsubs.s  4.1 (Berkeley) 12/4/88
        !            18:  */
        !            19: 
        !            20: /* This is taken from bcmp.s from 4.2.
        !            21:  * The output of bunequal is the offset of the byte which didn't match;
        !            22:  * if all the bytes match, then we return n.
        !            23:  *
        !            24:  * BUGNOTE:  This has no chance of working for lengths greater than 64K.
        !            25:  *             (so, if you use this somewhere else, you may need to
        !            26:  *             fix it...)
        !            27:  */
        !            28: 
        !            29: /* bunequal(s1, s2, n) */
        !            30: 
        !            31: #include "defs.h"
        !            32: 
        !            33: ENTRY(bunequal)
        !            34:        movl    4(ap),r1
        !            35:        movl    8(ap),r3
        !            36:        movl    12(ap),r4
        !            37: 1:
        !            38:        movzwl  $65535,r0
        !            39:        cmpl    r4,r0
        !            40:        jleq    2f
        !            41:        subl2   r0,r4
        !            42:        cmpc3   r0,(r1),(r3)
        !            43:        jeql    1b
        !            44:        addl2   r4,r0
        !            45:        /* changes... */
        !            46:        subl3   r0,12(ap),r0
        !            47:        /* end of changes for bunequal... */
        !            48:        ret
        !            49: 2:
        !            50:        cmpc3   r4,(r1),(r3)
        !            51:        /* changes... */
        !            52:        subl3   r0,12(ap),r0
        !            53:        /* end of changes for bunequal... */
        !            54:        ret
        !            55: 
        !            56: 
        !            57: 
        !            58: 
        !            59: /* brand new code, using the above as base... */
        !            60: /* bskip(s1, n, b) : finds the first occurrence of any byte != 'b' in the 'n'
        !            61:  * bytes beginning at 's1'.
        !            62:  *
        !            63:  * BUGNOTE:  This has no chance of working for lengths greater than 64K.
        !            64:  *             (so, if you use this somewhere else, you may need to
        !            65:  *             fix it...)
        !            66:  */
        !            67: 
        !            68: ENTRY(bskip)
        !            69:        movl    4(ap),r1
        !            70:        movl    8(ap),r3
        !            71:        movl    12(ap),r4
        !            72: 1:
        !            73:        movzwl  $65535,r0
        !            74:        cmpl    r3,r0
        !            75:        jleq    2f
        !            76:        subl2   r0,r3
        !            77:        skpc    r4,r0,(r1)
        !            78:        jeql    1b
        !            79:        addl2   r3,r0
        !            80:        subl3   r0,8(ap),r0
        !            81:        ret
        !            82: 2:
        !            83:        skpc    r4,r3,(r1)
        !            84:        subl3   r0,8(ap),r0
        !            85:        ret

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