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Assembly Source File  |  1992-06-10  |  1.3 KB  |  48 lines
  1. ;[]-----------------------------------------------------------------[]
  2. ;|      H_PSBH.ASM -- huge pointer routines                          |
  3. ;[]-----------------------------------------------------------------[]
  4.  
  5. ;
  6. ;       C/C++ Run Time Library - Version 5.0
  7. ; 
  8. ;       Copyright (c) 1987, 1992 by Borland International
  9. ;       All Rights Reserved.
  10. ; 
  11.  
  12. ; calls to these routines are generated by the compiler to perform
  13. ; arithmetic operations on proteced/fast huge pointers.
  14.  
  15. _TEXT           SEGMENT BYTE PUBLIC 'CODE'
  16.                 ASSUME  CS:_TEXT
  17. ;
  18. ;       dx:ax   left hand pointer
  19. ;       cx:bx   right hand pointer
  20. ;
  21.                 public  N_PSBH@
  22.                 public  F_PSBH@
  23.  
  24. N_PSBH@:        push    si
  25.                 mov     si, cx
  26.                 mov     cx, offset __AHSHIFT
  27.                 shr     dx, cl
  28.                 shr     si, cl
  29.                 sub     ax, bx
  30.                 sbb     dx, si
  31.                 pop     si
  32.                 ret
  33.  
  34. F_PSBH@:        push    si
  35.                 mov     si, cx
  36.                 mov     cx, offset __AHSHIFT
  37.                 shr     dx, cl
  38.                 shr     si, cl
  39.                 sub     ax, bx
  40.                 sbb     dx, si
  41.                 pop     si
  42.                 retf
  43. _TEXT           ENDS
  44.  
  45. extrn   __AHSHIFT:far
  46.                 END
  47.  
  48.