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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. Alexander Cherepanov‏ @ch3root 13 May 2016
      Replying to @volatile_void

      Do you mean it as a philosophical POV or that gcc will optimize "if (p)" away based on this assumption?

      2 replies 0 retweets 0 likes
    2. friend void‏ @volatile_void 13 May 2016
      Replying to @ch3root

      I meant it philosophically, but now I have investigated and ugh https://godbolt.org/g/piu9ka  cc @RichFelker

      1 reply 0 retweets 0 likes
    3. friend void‏ @volatile_void 13 May 2016
      Replying to @volatile_void @ch3root @RichFelker

      I am pretty sure it's possible to merge these to programs into one that shows GCC is as wrong as Clang on this.

      1 reply 0 retweets 0 likes
    4. friend void‏ @volatile_void 13 May 2016
      Replying to @volatile_void @ch3root @RichFelker

      oops that was still Clang being wrong in that link, no sign of GCC being inconsistent so far.

      1 reply 0 retweets 0 likes
    5. Rich Felker‏ @RichFelker 13 May 2016
      Replying to @volatile_void @ch3root

      Indeed. The invalid optimization clang is making is assuming malloc doesn't fail. Unless GCC also does that, GCC is ok.

      1 reply 0 retweets 1 like
    6. Alexander Cherepanov‏ @ch3root 14 May 2016
      Replying to @RichFelker

      Why do you think this is an invalid optimization? Compilers routinely mess with libc functions, e.g. inline memcpy.

      2 replies 0 retweets 0 likes
    7. Rich Felker‏ @RichFelker 14 May 2016
      Replying to @ch3root

      Because the behavior is changed. A call which necessarily must fail falsely succeeds.

      2 replies 0 retweets 0 likes
    8. Alexander Cherepanov‏ @ch3root 14 May 2016
      Replying to @RichFelker

      The change of behavior is exactly the reason for optimizations.

      2 replies 0 retweets 1 like
    9. Alexander Cherepanov‏ @ch3root 14 May 2016
      Replying to @ch3root @RichFelker

      Programs become smaller, require less memory and can successfully process larger data sets.

      2 replies 0 retweets 0 likes
    10. Rich Felker‏ @RichFelker 14 May 2016
      Replying to @ch3root

      I challenge you to provide an example where that can actually happen.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 14 May 2016
      Replying to @RichFelker @ch3root

      You obviously can't optimize out malloc if the memory is actually used. Moving to stack could overflow stack.

      9:33 AM - 14 May 2016
      • 1 Like
      • always @ ( * )
      1 reply 0 retweets 1 like
        1. New conversation
        2. Alexander Cherepanov‏ @ch3root 14 May 2016
          Replying to @RichFelker

          Not sure what you are asking for. Surely if you non-trivially use whole allocated block this cannot be optimized away.

          1 reply 0 retweets 0 likes
        3. Alexander Cherepanov‏ @ch3root 14 May 2016
          Replying to @ch3root @RichFelker

          The question is what is "actually used" or "non-trivially use".

          1 reply 0 retweets 0 likes
        4. Alexander Cherepanov‏ @ch3root 14 May 2016
          Replying to @ch3root @RichFelker

          F.e., https://godbolt.org/g/4fU99Z  exhausts the stack when compiled without optimizations.

          1 reply 0 retweets 0 likes
        5. Alexander Cherepanov‏ @ch3root 14 May 2016
          Replying to @ch3root @RichFelker

          https://godbolt.org/g/sb0Lah  aborts (due to the lack of memory) without optimizations and with -m32.

          1 reply 0 retweets 0 likes
        6. Alexander Cherepanov‏ @ch3root 14 May 2016
          Replying to @ch3root @RichFelker

          You can of course optimize these examples by hand. But the same is true for other cases and other optimizations.

          0 replies 0 retweets 0 likes
        7. End of conversation

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