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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. John Regehr‏ @johnregehr 4 Apr 2016

      wrapping signed integers (vs undefined signed overflow) slow down SPEC CPU 2006 by 1.4% when compiled by Clang 3.8 cc @samth

      4 replies 5 retweets 15 likes
    2. Sam Tobin-Hochstadt‏ @samth 4 Apr 2016
      Replying to @johnregehr

      @johnregehr makes the undefinedness seem pretty inexcusable, doesn't it?

      4 replies 2 retweets 2 likes
    3. John Regehr‏ @johnregehr 4 Apr 2016
      Replying to @samth

      @samth are you kidding? there are tiny loops that slow down probably 50% due to wrapping! we can't be slow on those

      1 reply 0 retweets 1 like
    4. John Regehr‏ @johnregehr 4 Apr 2016
      Replying to @johnregehr

      @samth but more seriously, the UB makes checkers like UBSan possible -- you can't do that in Java

      2 replies 0 retweets 3 likes
    5. Sam Tobin-Hochstadt‏ @samth 4 Apr 2016
      Replying to @johnregehr

      @johnregehr Why not? It's more restrictive so has to be opt-in, but so is UBsan.

      1 reply 0 retweets 0 likes
    6. John Regehr‏ @johnregehr 4 Apr 2016
      Replying to @samth

      @samth fine, if you want to write not-Java. UBSan works for C without creating a dialect.

      1 reply 0 retweets 2 likes
    7. Sam Tobin-Hochstadt‏ @samth 4 Apr 2016
      Replying to @johnregehr

      @johnregehr Surely UBsan is a dialect as well, in that you wouldn't be able to automatically switch it on in production.

      1 reply 0 retweets 0 likes
    8. John Regehr‏ @johnregehr 4 Apr 2016
      Replying to @samth

      @samth that's the point: it isn't a dialect, it only flags programs that were broken under the C standard

      1 reply 0 retweets 0 likes
    9. Sam Tobin-Hochstadt‏ @samth 4 Apr 2016
      Replying to @johnregehr

      @johnregehr My point is that "not broken according to the C standard" is a dialect that most people don't program in.

      2 replies 0 retweets 4 likes
      Rich Felker‏ @RichFelker 14 Nov 2016
      Replying to @samth @johnregehr

      The people who refuse to program in it need to stop claiming they are programming/can program C. They're not.

      9:22 AM - 14 Nov 2016
      0 replies 0 retweets 0 likes

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