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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 23 Nov 2015
      Replying to @stephenrkell

      @stephenrkell I don't see unawareness at all here. They have ubsan, language dialect options to allow common mistakes, etc.

      1 reply 0 retweets 0 likes
    2. Stephen Kell‏ @stephenrkell 23 Nov 2015
      Replying to @RichFelker

      @RichFelker Okay, but the bottom line is still: "your bugs => your problem; UB = optimisation opportunity". How about "-Oonly-known-good"?

      1 reply 0 retweets 0 likes
    3. Rich Felker‏ @RichFelker 23 Nov 2015
      Replying to @stephenrkell

      @stephenrkell A safety/hardening-oriented -O level would probably be welcome if someone wants to develop it.

      1 reply 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker 23 Nov 2015
      Replying to @RichFelker

      @stephenrkell However lots of UB is nearly as dangerous even without optimizations that actively 'exploit' it. It's undefined for a reason.

      1 reply 0 retweets 0 likes
    5. Stephen Kell‏ @stephenrkell 23 Nov 2015
      Replying to @RichFelker

      @RichFelker I'd say "many reasons", which is why this issue is so complex... (hmm, perhaps I should blog about this soonish).

      1 reply 0 retweets 0 likes
    6. Rich Felker‏ @RichFelker 23 Nov 2015
      Replying to @stephenrkell

      @stephenrkell Also, if you write a proper optimizing compiler, you have to go out of your way NOT to "exploit UB" or else badly pessimize.

      3 replies 0 retweets 0 likes
    7. Stephen Kell‏ @stephenrkell 23 Nov 2015
      Replying to @RichFelker

      @RichFelker That's the conventional wisdom. Problem is I'm a serial doubter. Do you know any experiments that measure this effect?

      1 reply 0 retweets 0 likes
    8. Rich Felker‏ @RichFelker 23 Nov 2015
      Replying to @stephenrkell

      @stephenrkell I don't know how to measure the effect, but many historical aliasing/etc hacks I saw were obviously working around bad codegen

      1 reply 0 retweets 0 likes
    9. Rich Felker‏ @RichFelker 23 Nov 2015
      Replying to @RichFelker

      @stephenrkell To quantify you'd need a tool to find such hacks in code from times when compilers were that bad, then guess motive by hand.

      1 reply 0 retweets 0 likes
    10. Stephen Kell‏ @stephenrkell 23 Nov 2015
      Replying to @RichFelker

      @RichFelker Agreed it's hard to measure. Out of interest, would love to see any examples of said historical hacks....

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 23 Nov 2015
      Replying to @stephenrkell

      @stephenrkell First example, my own strlen, which is pending either addition of proper may_alias attr or rewrite. http://git.musl-libc.org/cgit/musl/diff/src/string/strlen.c?id=571744447c23f91feb6439948f3a619aca850dfb …

      11:20 AM - 23 Nov 2015
      2 replies 0 retweets 0 likes
        1. Stephen Kell‏ @stephenrkell 23 Nov 2015
          Replying to @RichFelker

          @RichFelker Thanks... nice example. Will ruminate.

          0 replies 0 retweets 0 likes
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        1. Rich Felker‏ @RichFelker 23 Nov 2015
          Replying to @RichFelker

          @stephenrkell GCC fails to vectorize in integer registers, can only vectorize on targets with explicit vector registers/operations.

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