DOS ain't dead

MMX moves (Developers)

posted by Japheth , Germany (South), 16.02.2009, 22:05

There's no speed to gain simply by using MMX registers instead of the standard ones. At least you'll have to use the MOVNTQ instruction to get a significant boost.

A pretty good pdf about this topic, which you hopefully can find via Google, is: gdc_2002_amd.pdf

It shows how to achieve faster memcopy speed by using several "tricks" (MMX, XMM, "prefetch" ). IIRC I once wrote a small tool which implemented most of the strategies mentioned in this document. There's a small chance that I'll be able to remember how I named it.

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MS-DOS forever!

Complete thread:

• MMX moves - Laaca, 16.02.2009, 21:20 (Developers)
  • MMX moves - rr, 16.02.2009, 21:34
  • MMX moves - Japheth, 16.02.2009, 22:05
    • MMX moves - rr, 16.02.2009, 22:11
      • MMX moves - Japheth, 17.02.2009, 13:52
        • MMX moves - Laaca, 17.02.2009, 16:29
          • MMX moves - Japheth, 17.02.2009, 17:16
            • MMX moves - Laaca, 17.02.2009, 18:56
      • MMX moves - marcov, 18.02.2009, 09:55
  • MMX moves - FFK, 16.02.2009, 23:04
  • MMX moves - Rugxulo, 17.02.2009, 00:54
  • MMX moves - FFK, 17.02.2009, 21:37
    • MMX moves - Rugxulo, 18.02.2009, 00:48
    • MMX moves - Japheth, 18.02.2009, 09:08
      • MMX moves - FFK, 18.02.2009, 09:44