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Text File  |  1993-12-01  |  2.3 KB  |  98 lines
  1.     .file    "poly_div.S"
  2. /*---------------------------------------------------------------------------+
  3.  |  poly_div.S                                                               |
  4.  |                                                                           |
  5.  | A set of functions to divide 64 bit integers by fixed numbers.            |
  6.  |                                                                           |
  7.  | Copyright (C) 1992    W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
  8.  |                       Australia.  E-mail   billm@vaxc.cc.monash.edu.au    |
  9.  |                                                                           |
  10.  | Call from C as:                                                           |
  11.  |   void poly_div2(unsigned long long *x)                                   |
  12.  |   void poly_div4(unsigned long long *x)                                   |
  13.  |   void poly_div16(unsigned long long *x)                                  |
  14.  |                                                                           |
  15.  +---------------------------------------------------------------------------*/
  16.  
  17. #include "fpu_asm.h"
  18.  
  19. .text
  20.  
  21. /*---------------------------------------------------------------------------*/
  22.     .align 2,144
  23. .globl _poly_div2
  24. _poly_div2:
  25.     pushl %ebp
  26.     movl %esp,%ebp
  27.  
  28.     movl PARAM1,%ecx
  29.     movw (%ecx),%ax
  30.  
  31.     shrl $1,4(%ecx)
  32.     rcrl $1,(%ecx)
  33.  
  34.     testw $1,%ax
  35.     je poly_div2_exit
  36.  
  37.     addl $1,(%ecx)
  38.     adcl $0,4(%ecx)
  39. poly_div2_exit:
  40.  
  41.     leave
  42.     ret
  43. /*---------------------------------------------------------------------------*/
  44.     .align 2,144
  45. .globl _poly_div4
  46. _poly_div4:
  47.     pushl %ebp
  48.     movl %esp,%ebp
  49.  
  50.     movl PARAM1,%ecx
  51.     movw (%ecx),%ax
  52.  
  53.     movl 4(%ecx),%edx
  54.     shll $30,%edx
  55.  
  56.     shrl $2,4(%ecx)
  57.     shrl $2,(%ecx)
  58.  
  59.     orl %edx,(%ecx)
  60.  
  61.     testw $2,%ax
  62.     je poly_div4_exit
  63.  
  64.     addl $1,(%ecx)
  65.     adcl $0,4(%ecx)
  66. poly_div4_exit:
  67.  
  68.     leave
  69.     ret
  70. /*---------------------------------------------------------------------------*/
  71.     .align 2,144
  72. .globl _poly_div16
  73. _poly_div16:
  74.     pushl %ebp
  75.     movl %esp,%ebp
  76.  
  77.     movl PARAM1,%ecx
  78.     movw (%ecx),%ax
  79.  
  80.     movl 4(%ecx),%edx
  81.     shll $28,%edx
  82.  
  83.     shrl $4,4(%ecx)
  84.     shrl $4,(%ecx)
  85.  
  86.     orl %edx,(%ecx)
  87.  
  88.     testw $8,%ax
  89.     je poly_div16_exit
  90.  
  91.     addl $1,(%ecx)
  92.     adcl $0,4(%ecx)
  93. poly_div16_exit:
  94.  
  95.     leave
  96.     ret
  97. /*---------------------------------------------------------------------------*/
  98.