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Annotation of 43BSDTahoe/lib/libc/gen/gen.tahoe/udiv.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 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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