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BRIAN_____'s profile
Brian Smith
Brian Smith
Brian Smith
@BRIAN_____

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Brian Smith

@BRIAN_____

Code farmer. Security, crypto, performance, networking, usability. Rust, C++, C, Haskell, DSLs, etc. *ring*, webpki, crypto-bench, mozilla::pkix.

Honolulu & San Francisco
briansmith.org
Joined April 2008

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    1. John Regehr‏ @johnregehr 23 Feb 2016

      '“Optimization” based on undefined behaviour hurts performance' http://www.complang.tuwien.ac.at/kps2015/proceedings/KPS_2015_submission_29.pdf …

      9 replies 42 retweets 73 likes
    2. Alexander Cherepanov‏ @ch3root 25 Feb 2016
      Replying to @johnregehr

      @johnregehr TL;DR: fixing code in C is hard, let's rewrite everything in asm:-)

      1 reply 0 retweets 1 like
    3. Alexander Cherepanov‏ @ch3root 25 Feb 2016
      Replying to @ch3root

      @johnregehr (One possible interpretation is that writing proper C is hard bc you can't learn it by trying and have to work from the std but\

      2 replies 0 retweets 0 likes
    4. Alexander Cherepanov‏ @ch3root 25 Feb 2016
      Replying to @ch3root

      @johnregehr the author doesn't say it explicitly and somehow dismiss UBSAN even though references [DLRA12].)

      1 reply 0 retweets 0 likes
    5. Alexander Cherepanov‏ @ch3root 25 Feb 2016
      Replying to @ch3root

      @johnregehr The author also missed the main conspiracy in analysis of the SATD example. The code looks like in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55216 … which

      1 reply 0 retweets 0 likes
    6. Alexander Cherepanov‏ @ch3root 25 Feb 2016
      Replying to @ch3root

      @johnregehr is a dup of https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53073 …. And this bug is closed as INVALID.

      1 reply 0 retweets 0 likes
    7. Alexander Cherepanov‏ @ch3root 25 Feb 2016
      Replying to @ch3root

      @johnregehr Surely gcc devs publicly stated that it's INVALID just to save the face while secretly fixing gcc to properly handle SPEC. :-)

      2 replies 0 retweets 2 likes
    8. Alexander Cherepanov‏ @ch3root 25 Feb 2016
      Replying to @ch3root

      @johnregehr And https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66875 … referenced in footnote 6 seems to be different from this bug.

      1 reply 0 retweets 0 likes
    9. Alexander Cherepanov‏ @ch3root 25 Feb 2016
      Replying to @ch3root

      @johnregehr (Well, at least the article pointed out interesting bug reports.)

      1 reply 0 retweets 1 like
    10. Alexander Cherepanov‏ @ch3root 25 Feb 2016
      Replying to @ch3root

      @johnregehr Overall, it's a pity that a potentially useful article about such important topic turns out to be an angry rant.

      1 reply 0 retweets 1 like
      Brian Smith‏ @BRIAN_____ 25 Feb 2016
      Replying to @ch3root

      @ch3root @johnregehr An angry rant? About undefined behavior? On the internet?

      11:56 AM - 25 Feb 2016
      • 2 Likes
      • John Regehr friend void
      1 reply 0 retweets 2 likes
        1. New conversation
        2. Alexander Cherepanov‏ @ch3root 25 Feb 2016
          Replying to @BRIAN_____

          @BRIAN_____ @johnregehr Yes, this is important:-)

          1 reply 0 retweets 0 likes
        3. Alexander Cherepanov‏ @ch3root 25 Feb 2016
          Replying to @ch3root

          @BRIAN_____ @johnregehr Seriously though, it looks like an academic paper so it's not your usual rant on the internet.

          1 reply 0 retweets 0 likes
        4. Alexander Cherepanov‏ @ch3root 25 Feb 2016
          Replying to @ch3root

          @BRIAN_____ @johnregehr The author did a comparison of compiler optimizations with source-level optimizations (section 4.2).

          1 reply 0 retweets 0 likes
        5. Alexander Cherepanov‏ @ch3root 25 Feb 2016
          Replying to @ch3root

          @BRIAN_____ @johnregehr He is a compiler author too (apparently, he is one of the original authors of gforth started in mid-1992).

          1 reply 0 retweets 0 likes
        6. Alexander Cherepanov‏ @ch3root 25 Feb 2016
          Replying to @ch3root

          @BRIAN_____ @johnregehr So, yes, I expected much more serious approach.

          0 replies 0 retweets 0 likes
        7. End of conversation

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