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Internet Message Format  |  1996-08-05  |  1.3 KB
  1. Path: news.eunet.fi!fipnet!kone!jsaarinen
  2. Newsgroups: comp.sys.amiga.programmer
  3. X-NewsReader: IntuiNews 1.2b (31.7.94)
  4. References: <4d6v0t$3dt@maureen.teleport.com> <4dg4jk$km@news.cs.tu-berlin.de> <4dhvd5$5r2@maureen.teleport.com> <38232113@kone.fipnet.fi> <4e10ol$ck3@maureen.teleport.com>
  5. From: "Jyrki Saarinen" <jsaarinen@kone.fipnet.fi>
  6. Date: Tue, 23 Jan 96 18:45:21 UT
  7. Comments: Illegal date header - new date added by quicknews
  8. X-Original-Date: Tue, 23 Jan 96 19:02:44 
  9. MIME-Version: 1.0
  10. Content-Type: text/plain; charset=iso-8859-1
  11. Content-Transfer-Encoding: binary
  12. Subject: Re: TMapping again!
  13. Message-ID: <38232152@kone.fipnet.fi>
  14.  
  15.  
  16. >         repeat  8
  17. >         mw      D1,D2
  18. >         mb      D0,D2
  19. >         addx.l  d7,D0
  20. >         movea.l d2,a0
  21. >         addx.l  d6,D1
  22. >         mw      (A0),d3
  23. >         mw      D1,D2
  24. >         mb      D0,D2
  25. >         movea.l d2,a0
  26. >         mb      (A0),d3
  27. >         addx.l  d7,D0
  28. >         addx.l  d6,D1
  29. >         mw      d3,(a1)+
  30. >         endr
  31.  
  32. How do you have the fraction bits in d7 and d6? Also,
  33. how do you do addx correction before the loop with
  34. two addx?
  35.  
  36. Also, does it really pay off buffering two pixels
  37. to a register instead of writing bytewise? At least
  38. if I count 020/030 cycles it does not pay off.
  39.  
  40. --                               _
  41. a Stellar programmer          _ //
  42. "Amiga - back for the future" \X/
  43.