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Annotation of 43BSDTahoe/lib/libc/gen/gen.tahoe/udiv.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:  * This code is derived from software contributed to Berkeley by
        !            18:  * Computer Consoles Inc.
        !            19:  */
        !            20: 
        !            21: #if defined(LIBC_SCCS) && !defined(lint)
        !            22:        .asciz "@(#)udiv.s      1.4 (Berkeley) 6/27/88"
        !            23: #endif /* LIBC_SCCS and not lint */
        !            24: 
        !            25: /*
        !            26:  * Unsigned divide.
        !            27:  *
        !            28:  * udiv(dividend, divisor)
        !            29:  */
        !            30: #include "DEFS.h"
        !            31: 
        !            32: ASENTRY(udiv, 0)
        !            33:        bitl    $0x80000000,8(fp)       #  if (divisor & 0x80000000){
        !            34:        jeql    1f                        
        !            35:        cmpl    8(fp),4(fp)             #  if (divisor > dividend )
        !            36:        jlequ   2f
        !            37:        clrl    r0                      #      return(0);
        !            38:        ret
        !            39: 2:                                     #  else
        !            40:        movl    $1,r0                   #      return(1);}
        !            41:        ret
        !            42: 1:
        !            43:        clrl    r2                      #  return(dividend/divisor);
        !            44:        movl    4(fp),r3
        !            45:        ediv    8(fp),r2,r0,r1
        !            46:        ret
        !            47: 
        !            48: /*
        !            49:  * audiv(dividendp, divisor) -- like udiv but uses address of dividend.
        !            50:  *     Implements /= avoiding side effects in the dividend expression.
        !            51:  */
        !            52: ASENTRY(audiv, 0)
        !            53:        bitl    $0x80000000,8(fp)       #  if (divisor & 0x80000000){
        !            54:        jeql    1f                        
        !            55:        cmpl    8(fp),*4(fp)            #  if (divisor > dividend )
        !            56:        jlequ   2f
        !            57:        clrl    r0                      #      return(0);
        !            58:        jbr     3f
        !            59: 2:                                     #  else
        !            60:        movl    $1,r0                   #      return(1);}
        !            61:        jbr     3f
        !            62: 1:
        !            63:        clrl    r2                      #  return(dividend/divisor);
        !            64:        movl    *4(fp),r3
        !            65:        ediv    8(fp),r2,r0,r1
        !            66: 3:
        !            67:        movl    r0,*4(fp)
        !            68:        ret

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