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Annotation of 43BSDTahoe/ucb/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 this notice is preserved and that due credit is given
        !             7:  * to the University of California at Berkeley. The name of the University
        !             8:  * may not be used to endorse or promote products derived from this
        !             9:  * software without specific prior written permission. This software
        !            10:  * is provided ``as is'' without express or implied warranty.
        !            11:  *
        !            12:  *     @(#)vaxbsubs.s  1.2 (Berkeley) 3/28/88
        !            13:  */
        !            14: 
        !            15: /* This is taken from bcmp.s from 4.2.
        !            16:  * The output of bunequal is the offset of the byte which didn't match;
        !            17:  * if all the bytes match, then we return n.
        !            18:  *
        !            19:  * BUGNOTE:  This has no chance of working for lengths greater than 64K.
        !            20:  *             (so, if you use this somewhere else, you may need to
        !            21:  *             fix it...)
        !            22:  */
        !            23: 
        !            24: /* bunequal(s1, s2, n) */
        !            25: 
        !            26: #include "defs.h"
        !            27: 
        !            28: ENTRY(bunequal)
        !            29:        movl    4(ap),r1
        !            30:        movl    8(ap),r3
        !            31:        movl    12(ap),r4
        !            32: 1:
        !            33:        movzwl  $65535,r0
        !            34:        cmpl    r4,r0
        !            35:        jleq    2f
        !            36:        subl2   r0,r4
        !            37:        cmpc3   r0,(r1),(r3)
        !            38:        jeql    1b
        !            39:        addl2   r4,r0
        !            40:        /* changes... */
        !            41:        subl3   r0,12(ap),r0
        !            42:        /* end of changes for bunequal... */
        !            43:        ret
        !            44: 2:
        !            45:        cmpc3   r4,(r1),(r3)
        !            46:        /* changes... */
        !            47:        subl3   r0,12(ap),r0
        !            48:        /* end of changes for bunequal... */
        !            49:        ret
        !            50: 
        !            51: 
        !            52: 
        !            53: 
        !            54: /* brand new code, using the above as base... */
        !            55: /* bskip(s1, n, b) : finds the first occurrence of any byte != 'b' in the 'n'
        !            56:  * bytes beginning at 's1'.
        !            57:  *
        !            58:  * BUGNOTE:  This has no chance of working for lengths greater than 64K.
        !            59:  *             (so, if you use this somewhere else, you may need to
        !            60:  *             fix it...)
        !            61:  */
        !            62: 
        !            63: ENTRY(bskip)
        !            64:        movl    4(ap),r1
        !            65:        movl    8(ap),r3
        !            66:        movl    12(ap),r4
        !            67: 1:
        !            68:        movzwl  $65535,r0
        !            69:        cmpl    r3,r0
        !            70:        jleq    2f
        !            71:        subl2   r0,r3
        !            72:        skpc    r4,r0,(r1)
        !            73:        jeql    1b
        !            74:        addl2   r3,r0
        !            75:        subl3   r0,8(ap),r0
        !            76:        ret
        !            77: 2:
        !            78:        skpc    r4,r3,(r1)
        !            79:        subl3   r0,8(ap),r0
        !            80:        ret

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