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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. friend void‏ @volatile_void Jun 23

      Out of Context Undefined Behavior Clang cannot optimize f's return value to 1.0f because caller1 is a valid calling context and has to produce 2.0f, but on the other hand, caller2 invokes undefined behavior by violating so-called “strict aliasing” rules. https://godbolt.org/g/aU5uZo pic.twitter.com/nKRjbtYoJn

      2 replies 0 retweets 8 likes
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    2. Rich Felker‏ @RichFelker Jun 23
      Replying to @volatile_void

      Where is the UB? Looks ok to me.

      1 reply 0 retweets 0 likes
    3. friend void‏ @volatile_void Jun 23
      Replying to @RichFelker

      With dynamically allocated memory, the effective type is reset by new writes. When called from caller2, after line 8, that part of memory is an array of unsigned char, it's wrong to read it as a float.

      2 replies 0 retweets 1 like
    4. Shafik Yaghmour‏ @shafikyaghmour Jun 23
      Replying to @volatile_void @RichFelker

      In my strict aliasing write-up https://twitter.com/shafikyaghmour/status/979720927008051200 … I reference this article by Jens on effective type https://gustedt.wordpress.com/2016/08/17/effective-types-and-aliasing/ … and it backs up this interpretation.pic.twitter.com/PTfJGtqQZz

      1 reply 0 retweets 3 likes
      Rich Felker‏ @RichFelker Jun 23
      Replying to @shafikyaghmour @volatile_void

      You can easily derive nonsense from this interpretation. It's wrong.

      7:32 PM - 23 Jun 2018
      1 reply 0 retweets 0 likes
        1. Shafik Yaghmour‏ @shafikyaghmour Jun 23
          Replying to @RichFelker @volatile_void

          See WG21 proposal p0593 http://wg21.link/p0593  which aimed at the last meeting but I don't think was presented. It points to DR 236 http://www.open-std.org/jtc1/sc22/wg14/www/docs/dr_236.htm … which has relevant but unresolved points. Maybe @zygoloid might have some opinions here.pic.twitter.com/CpdlAnk6LX

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