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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. Rich Felker‏ @RichFelker Jan 5

      Given that speculative exec can fill cache, how much cache & dram bw is being wasted loading data we don't want?

      1 reply 0 retweets 1 like
    2. Josh Simmons‏ @dotstdy Jan 5
      Replying to @RichFelker

      It's only on mispredict though? So probably not much in the grand scheme of things?

      2 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker Jan 5
      Replying to @dotstdy

      That depends; plenty of software has branches that are entirely unpredictable (prediction statistically no better than coin toss).

      5:52 PM - 5 Jan 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Brendan G Bohannon‏ @cr88192 Jan 5
          Replying to @RichFelker @dotstdy

          at least on K10, the CPU perf would "eat it" on unpredictable branches, so it was often better to always evaluate both possible branches and then use bit-masking to select the desired answer. on my Piledriver based FX, this seems to be less of an issue...

          1 reply 0 retweets 0 likes
        3. Brendan G Bohannon‏ @cr88192 Jan 5
          Replying to @cr88192 @RichFelker @dotstdy

          though, in my testing, for small cases with "coin toss" probabilities, it is still often more effective to use branch-free logic, including any memory loads, ... in things like compressors or filters, branches are still sort of an enemy. just it is "smarter" here.

          0 replies 0 retweets 0 likes
        4. End of conversation

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