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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Tyler Glaiel‏Verified account @TylerGlaiel Mar 31

      if I enable AVX instructions in code gen will the code just not run on CPUs without them or will they just use something else and be slower in that case?

      4 replies 1 retweet 12 likes
    2. Casey Muratori‏ @cmuratori Mar 31
      Replying to @TylerGlaiel

      It's actually not that bad if you want to cheese it. Just compile twice into two DLLs, once with AVX and once without. Try to load and run the first one, if it crashes, load and run the second one. Done. (AVX on non-AVX CPUs will fault)

      3 replies 0 retweets 28 likes
    3. wunk‏ @Wunkolo Mar 31
      Replying to @cmuratori @TylerGlaiel

      Prob not a good idea that now every matrix multiplication or vector addition or whatever now involves chasing down pointers in a DLL's Import Address Table

      1 reply 0 retweets 0 likes
    4. Casey Muratori‏ @cmuratori Mar 31
      Replying to @Wunkolo @TylerGlaiel

      No you compile _the entire EXE_ this way. So, you make an EXE with nothing in it but LoadLibrary and then you call StartGame. Everything is in the game_avx.dll and game_sse.dll. Right?

      1 reply 0 retweets 5 likes
    5. Casey Muratori‏ @cmuratori Mar 31
      Replying to @cmuratori @Wunkolo @TylerGlaiel

      So there is zero performance overhead for this.

      1 reply 0 retweets 3 likes
    6. wunk‏ @Wunkolo Mar 31
      Replying to @cmuratori @TylerGlaiel

      Ah, you're talking about what ClearLinux does where the repository ships multiple different versions of the executable towards a bunch of different architectures and the user's OS "picks" the right one to download. Unlikely with shipped games though to be able to ship 12+ .exes

      1 reply 0 retweets 0 likes
      Casey Muratori‏ @cmuratori Apr 1
      Replying to @Wunkolo @TylerGlaiel

      It's literally 2 DLLs. Most games already have way more than 2 DLLs that they ship.

      11:21 AM - 1 Apr 2021
      • 5 Likes
      • int16_t Jae limepixl Ivan Braidi Rytis
      1 reply 0 retweets 5 likes
        1. New conversation
        2. Tyler Glaiel‏Verified account @TylerGlaiel Apr 1
          Replying to @cmuratori @Wunkolo

          I static link everything I can [only need steam_api64.dll currently]. not against adding more I just find it nice to not need them

          1 reply 0 retweets 0 likes
        3. Casey Muratori‏ @cmuratori Apr 1
          Replying to @TylerGlaiel @Wunkolo

          How do you do dynamic code reloading? Or do you not do that?

          1 reply 0 retweets 0 likes
        4. Show replies
        1. This Tweet is unavailable.
        2. Tyler Glaiel‏Verified account @TylerGlaiel Apr 1
          Replying to @Wunkolo @cmuratori

          i feel like this is just restating everything thats been said already in this thread?

          0 replies 0 retweets 0 likes
        3. End of conversation

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