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Annotation of 43BSDReno/lib/libc/tahoe/gen/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: (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 "@(#)udiv.s      1.5 (Berkeley) 6/1/90"
                     25: #endif /* LIBC_SCCS and not lint */
                     26: 
                     27: /*
                     28:  * Unsigned divide.
                     29:  *
                     30:  * udiv(dividend, divisor)
                     31:  */
                     32: #include "DEFS.h"
                     33: 
                     34: ASENTRY(udiv, 0)
                     35:        bitl    $0x80000000,8(fp)       #  if (divisor & 0x80000000){
                     36:        jeql    1f                        
                     37:        cmpl    8(fp),4(fp)             #  if (divisor > dividend )
                     38:        jlequ   2f
                     39:        clrl    r0                      #      return(0);
                     40:        ret
                     41: 2:                                     #  else
                     42:        movl    $1,r0                   #      return(1);}
                     43:        ret
                     44: 1:
                     45:        clrl    r2                      #  return(dividend/divisor);
                     46:        movl    4(fp),r3
                     47:        ediv    8(fp),r2,r0,r1
                     48:        ret
                     49: 
                     50: /*
                     51:  * audiv(dividendp, divisor) -- like udiv but uses address of dividend.
                     52:  *     Implements /= avoiding side effects in the dividend expression.
                     53:  */
                     54: ASENTRY(audiv, 0)
                     55:        bitl    $0x80000000,8(fp)       #  if (divisor & 0x80000000){
                     56:        jeql    1f                        
                     57:        cmpl    8(fp),*4(fp)            #  if (divisor > dividend )
                     58:        jlequ   2f
                     59:        clrl    r0                      #      return(0);
                     60:        jbr     3f
                     61: 2:                                     #  else
                     62:        movl    $1,r0                   #      return(1);}
                     63:        jbr     3f
                     64: 1:
                     65:        clrl    r2                      #  return(dividend/divisor);
                     66:        movl    *4(fp),r3
                     67:        ediv    8(fp),r2,r0,r1
                     68: 3:
                     69:        movl    r0,*4(fp)
                     70:        ret

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