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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
      Casey Muratori‏ @cmuratori Mar 31
      Replying to @cmuratori @TylerGlaiel

      If you want to be swankier about it you can call cpuid and see if the AVX caps are there and avoid trying the AVX one if they aren't.

      6:36 PM - 31 Mar 2021
      • 5 Likes
      • γper mud Dan Bechard Tyler Glaiel Scott Michaud
      1 reply 0 retweets 5 likes
        1. New conversation
        2. Tyler Glaiel‏Verified account @TylerGlaiel Mar 31
          Replying to @cmuratori

          I was actually wondering for the context of meow hash (since honestly, msvc with avx code gen enabled seems to do a whole lot of nothing for me vs just sse2) which uses intrinsics, so making an exe that can use both is like, half of the problem here

          1 reply 0 retweets 1 like
        3. Tyler Glaiel‏Verified account @TylerGlaiel Mar 31
          Replying to @TylerGlaiel @cmuratori

          the other half being, I guess, use a different hash library if avx is disabled, which adds a bunch of maintenance overhead (nevermind that for hash functions specifically I'd probably have to encode 2 hash values into the data instead of 1 if I did that)

          1 reply 0 retweets 0 likes
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