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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Steve Canon‏ @stephentyrone 15 Aug 2017

      Can't believe Intel announced Icelake before correcting the spelling of Cannonlake [sic].

      2 replies 0 retweets 8 likes
    2. Fiora Aeternal Suffering  🎃‏ @FioraAeterna 15 Aug 2017
      Replying to @stephentyrone

      they need to distinguish it from Canonlake, the chip with extremely good floating point.

      1 reply 0 retweets 7 likes
    3. Fiora Aeternal Suffering  🎃‏ @FioraAeterna 15 Aug 2017
      Replying to @FioraAeterna @stephentyrone

      that's the way you can tell whether it has AVX512 or not

      1 reply 0 retweets 3 likes
    4. Steve Canon‏ @stephentyrone 15 Aug 2017
      Replying to @FioraAeterna

      Alas "having AVX512" isn't a binary quality. It's more of a quantum state.

      3 replies 0 retweets 6 likes
    5. Fiora Aeternal Suffering  🎃‏ @FioraAeterna 15 Aug 2017
      Replying to @stephentyrone

      true, there's the 7 dimensional feature vector, and then the flavor

      1 reply 0 retweets 2 likes
    6. Fabian Giesen‏ @rygorous 15 Aug 2017
      Replying to @FioraAeterna @stephentyrone

      I for one welcome our new non-binary ISA extensions

      1 reply 0 retweets 4 likes
    7. Carlos Bederian‏ @_zzzoom_ 15 Aug 2017
      Replying to @rygorous @FioraAeterna @stephentyrone

      Xeon Gold and Platinum also get twice the FMA units on the same arch

      3 replies 0 retweets 2 likes
    8. Fiora Aeternal Suffering  🎃‏ @FioraAeterna 15 Aug 2017
      Replying to @_zzzoom_ @rygorous @stephentyrone

      that's the flavor bit

      2 replies 0 retweets 1 like
    9. Steve Canon‏ @stephentyrone 15 Aug 2017
      Replying to @FioraAeterna @_zzzoom_ @rygorous

      If you *really* want a laugh, look at Intel's guidance for how to figure out if you have one or two FMAs:pic.twitter.com/FWBazf0HpF

      5 replies 4 retweets 34 likes
      Rich Felker‏ @RichFelker 15 Aug 2017
      Replying to @stephentyrone @FioraAeterna and

      I assume this is a manual for writing a kernel, not application code, then?

      7:37 PM - 15 Aug 2017
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Steve Canon‏ @stephentyrone 15 Aug 2017
          Replying to @RichFelker @FioraAeterna and

          Sure, now everyone who needs this information just needs to persuade their kernel maintainers to add this test and vend a "feature bit".

          1 reply 0 retweets 1 like
        3. Steve Canon‏ @stephentyrone 15 Aug 2017
          Replying to @stephentyrone @RichFelker and

          I'm sure they'll get right on it.

          0 replies 0 retweets 0 likes
        4. End of conversation
        1. New conversation
        2. Fabian Giesen‏ @rygorous 15 Aug 2017
          Replying to @RichFelker @stephentyrone and

          no, this is app code

          1 reply 0 retweets 0 likes
        3. Fabian Giesen‏ @rygorous 15 Aug 2017
          Replying to @rygorous @RichFelker and

          The optimization guides are purely for user-mode code; kernel stuff is in the "System Programming Guide" (Vol 3) of the arch manuals.

          1 reply 0 retweets 0 likes
        4. Rich Felker‏ @RichFelker 15 Aug 2017
          Replying to @rygorous @stephentyrone and

          I was pointing out how idiotic it is in a context where you can't prevent asynchronous interruption.

          1 reply 0 retweets 0 likes
        5. Steve Canon‏ @stephentyrone 15 Aug 2017
          Replying to @RichFelker @rygorous and

          That's why you run each test three times, and cross your fingers and toes.

          1 reply 0 retweets 0 likes
        6. Rich Felker‏ @RichFelker 15 Aug 2017
          Replying to @stephentyrone @rygorous and

          So idiotic, but this is what their likely target audience, gamedev, is used to I guess...

          1 reply 0 retweets 0 likes
        7. Paul Khuong‏ @pkhuong 15 Aug 2017
          Replying to @RichFelker @stephentyrone and

          That, or single-app boxes that control scheduling with 1 thread/core and perhaps high/realtime priority.

          0 replies 0 retweets 0 likes
        8. End of conversation

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