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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 15 Apr 2017

      TIL MSVC's debugger uses 16 bit line numbers or something... https://stackoverflow.com/questions/43433206/vs2008-the-breakpoint-is-misaligned-with-the-source-code-by-65537-lines-in-a-c …

      1 reply 1 retweet 1 like
    2. Eric Gallager‏ @cooljeanius 15 Apr 2017
      Replying to @RichFelker

      On the 1 hand, if your source file is over 65537 lines, you should consider breaking it down. OTOH, M$ sucks for setting the limit that low

      1 reply 0 retweets 1 like
    3. Brendan G Bohannon‏ @cr88192 16 Apr 2017
      Replying to @cooljeanius @RichFelker

      but why spend 2x the memory for something which usually only happens in obscure edge-cases?... (well, unless using a mod-64k encoding).

      1 reply 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker 16 Apr 2017
      Replying to @cr88192 @cooljeanius

      Because 2x infinitessimal is still infinitessimal. Why are we having this conversion when MSVC is like 10GB or something?

      1 reply 0 retweets 1 like
    5. Brendan G Bohannon‏ @cr88192 16 Apr 2017
      Replying to @RichFelker @cooljeanius

      it could effect the size of OBJ files and PDBs though (nevermind if one doesn't usually distribute these). though, 24-bit could also work...

      2 replies 0 retweets 0 likes
    6. Brendan G Bohannon‏ @cr88192 16 Apr 2017
      Replying to @cr88192 @RichFelker @cooljeanius

      then again, I am also someone who often does LZ compressed bytecode, and tried to think up good ways to do LZ compressed executable code...

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 16 Apr 2017
      Replying to @cr88192 @cooljeanius

      Compressed code just wastes memory, because now you need to store 2 copies of it: the compressed version and the decompressed one to exec.

      6:31 AM - 16 Apr 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 16 Apr 2017
          Replying to @RichFelker @cr88192 @cooljeanius

          And for systems with shared memory it's not 1 vs 2 copies but rather 1 vs 1+N copies where N may be large.

          1 reply 0 retweets 0 likes
        3. Brendan G Bohannon‏ @cr88192 16 Apr 2017
          Replying to @RichFelker @cooljeanius

          the idea was to do a sort of ISA-level LZ compression where no explicit decompression step is needed (mostly fancy branching...).

          1 reply 0 retweets 0 likes
        4. Brendan G Bohannon‏ @cr88192 16 Apr 2017
          Replying to @cr88192 @RichFelker @cooljeanius

          for LZ'ed bytecode, the decompression can often be done during function/trace decoding (keeping redundancy small), depending on impl.

          1 reply 0 retweets 0 likes
        5. Brendan G Bohannon‏ @cr88192 16 Apr 2017
          Replying to @cr88192 @RichFelker @cooljeanius

          the problem for LZ-compr for live code is the added cost+complexity of call/return; and arch-related issues for an explicit LZ-match opcode.

          1 reply 0 retweets 0 likes
        6. Brendan G Bohannon‏ @cr88192 16 Apr 2017
          Replying to @cr88192 @RichFelker @cooljeanius

          but, anyways, the idea of doing LZ'ed code in a way where bulk decompression is needed for each process is pretty stupid, not the intention.

          1 reply 0 retweets 0 likes
        7. Brendan G Bohannon‏ @cr88192 16 Apr 2017
          Replying to @cr88192 @RichFelker @cooljeanius

          ADD: actually, even for bulk compr, it is possible to avoid needing 2x buffers by decompressing directly on top of the compressed version...

          0 replies 0 retweets 0 likes
        8. End of conversation

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