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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. Jacob Christian Munch-Andersen‏ @NoHatCoder Jul 13

      Quick question: How do you tell a C compiler to use an instruction set extension only within specific code blocks, like: if(processor_has_instruction) //use instruction else //fallback code that won't be optimised to use instruction Poke: @cmuratori

      2 replies 1 retweet 6 likes
    2. Casey Muratori‏ @cmuratori Jul 13
      Replying to @NoHatCoder

      [1/4] There's three ways people do this.

      1 reply 0 retweets 15 likes
    3. Casey Muratori‏ @cmuratori Jul 13
      Replying to @cmuratori @NoHatCoder

      [2/4] Put the code in a DLL, and have one version of the DLL for every architecture, then load the appropriate one at startup.

      1 reply 0 retweets 4 likes
    4. Casey Muratori‏ @cmuratori Jul 13
      Replying to @cmuratori @NoHatCoder

      [3/4] Put the code in a separate file and compile that file n times, one for each arch, with a macro that changes the names of the function so you can pick which one you call.

      1 reply 0 retweets 6 likes
    5. Casey Muratori‏ @cmuratori Jul 13
      Replying to @cmuratori @NoHatCoder

      [4/4] Compile the majority of the code with the minimum platform, but make separate versions of specific routines and decorate them with a compiler-specific prefix like "__attribute__ ((__target__("avx2")))" (CLANG).

      1 reply 0 retweets 6 likes
    6. Jacob Christian Munch-Andersen‏ @NoHatCoder Jul 13
      Replying to @cmuratori

      Of course I'm asking because I wonder what we should do in Meow. Neither of the two first options seem particularly user-friendly for a library, third one should take care of GCC and Clang. Are there any good options in MSVC?

      2 replies 0 retweets 1 like
      Casey Muratori‏ @cmuratori Jul 13
      Replying to @NoHatCoder

      For a library I think it should just be a single file, and you can include it as many times as you want with different #define's. That way the user can choose which of these they want, or none.

      12:51 PM - 13 Jul 2021
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Casey Muratori‏ @cmuratori Jul 13
          Replying to @cmuratori @NoHatCoder

          Or, if it turns out that they effectively share no code (which they well might!), then there's just 3 .h's - meow_aesni, meow_avx2, and meow_avx512, or something like that.

          1 reply 0 retweets 0 likes
        3. Casey Muratori‏ @cmuratori Jul 13
          Replying to @cmuratori @NoHatCoder

          My suspicion is, for Meow, basically the entire thing will be ASM-like, so probably just one .h file per platform is the best solution, with an example file that shows how to build them all and switch if you so desire.

          1 reply 0 retweets 0 likes
        4. Show replies

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