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Assembly Source File  |  1992-06-10  |  1.4 KB  |  51 lines
  1. ;[]-----------------------------------------------------------------[]
  2. ;|      F_PCMP.ASM -- long pointer comparison                        |
  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.         INCLUDE RULES.ASI
  13.  
  14. ; calls to this routine are generated by the compiler to compare
  15. ; long pointers.
  16.  
  17. _TEXT   SEGMENT BYTE PUBLIC 'CODE'
  18.         ASSUME  CS:_TEXT
  19. ;
  20. ;       PCMP@ - compares two pointers on the stack, sets the condition codes
  21. ;
  22. ;       ax,dx   left hand pointer
  23. ;       bx,cx   right hand pointer
  24.  
  25.         public  PCMP@
  26.         public  F_PCMP@
  27.  
  28. PCMP@           PROC    FAR
  29. F_PCMP@:
  30.                 push    cx
  31.                 mov     ch,al
  32.                 mov     cl,4
  33.                 shr     ax,cl
  34.                 add     dx,ax
  35.                 mov     al,ch
  36.                 mov     ah,bl
  37.                 shr     bx,cl
  38.                 pop     cx
  39.                 add     cx,bx           ; right hand pointer segment
  40.                 mov     bl,ah
  41.                 and     ax,0fh
  42.                 and     bx,0fh
  43.                 cmp     dx,cx           ; compare segments
  44.                 jne     PCMPend
  45.                 cmp     ax,bx           ; compare offsets
  46. PCMPend:
  47.                 ret
  48. PCMP@           ENDP
  49. _TEXT   ENDS
  50.         END
  51.