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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. Steve Canon‏ @stephentyrone Aug 28
      Replying to @RichFelker @cr88192 and

      It worked great! The only major issue was the formal semantics issues around extended types and intmax, as you sketched out.

      2 replies 0 retweets 1 like
    2. Rich Felker‏ @RichFelker Aug 28
      Replying to @stephentyrone @cr88192 and

      But preprocessor requires all arithmetic take place in a common signed or unsigned type matching [u]intmax_t...

      1 reply 0 retweets 0 likes
    3. Steve Canon‏ @stephentyrone Aug 28
      Replying to @RichFelker @cr88192 and

      As I said, the only real issue is around intmax.

      1 reply 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker Aug 28
      Replying to @stephentyrone @cr88192 and

      Even without stdint.h and intmax_t, though, you'd run into the same problem with consistently defining what's supposed to happen at the preprocessor level...

      1 reply 0 retweets 0 likes
    5. Steve Canon‏ @stephentyrone Aug 28
      Replying to @RichFelker @cr88192 and

      Yes. It breaks a whole mess of formal rules, but almost no real code is affected.

      1 reply 0 retweets 0 likes
    6. Rich Felker‏ @RichFelker Aug 28
      Replying to @stephentyrone @cr88192 and

      Clearly some of us do more awful things with the preprocessor than others... ;-)

      2 replies 0 retweets 3 likes
    7. Steve Canon‏ @stephentyrone Aug 28
      Replying to @RichFelker @cr88192 and

      I inserted the "almost" just for you.

      2 replies 0 retweets 3 likes
    8. Rich Felker‏ @RichFelker Aug 28
      Replying to @stephentyrone @cr88192 and

      See http://git.musl-libc.org/cgit/musl/tree/include/limits.h?id=v1.1.19#n10 …, which depends on I-think-likely-wrong behavior by gcc and other compilers of treating char constants as uintmax_t rather than intmax_t if char is unsigned.

      1 reply 0 retweets 2 likes
    9. Rich Felker‏ @RichFelker Aug 28
      Replying to @RichFelker @stephentyrone and

      I should probably replace with #if '\xff' > 0, no? EXAMPLE 2 under 6.4.4.4 explicitly blesses this usage, I think.

      1 reply 0 retweets 0 likes
    10. Stephen Checkoway‏ @stevecheckoway Aug 28
      Replying to @RichFelker @stephentyrone and

      Wait, so the reason we don't have uint128_t/int128_t is because uintmax_t/intmax_t??

      2 replies 0 retweets 1 like
      Rich Felker‏ @RichFelker Aug 28
      Replying to @stevecheckoway @stephentyrone and

      Yes, exactly. __int128 has to be treated as an implementation-defined type with implementation-defined semantics, not as an extended integer type in the framework C set forth, because the latter would require redefining intmax_t.

      11:08 AM - 28 Aug 2018
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker Aug 28
          Replying to @RichFelker @stevecheckoway and

          Specifically, if int128_t (and INT128_MAX, which would be testable at preprocessor level rather than just "configure level") were defined, INTMAX_MAX>=INT128_MAX would be mandatory and intmax_t would have to have rank >= rank of int128_t.

          1 reply 0 retweets 1 like
        3. Stephen Checkoway‏ @stevecheckoway Aug 28
          Replying to @RichFelker @stephentyrone and

          What about allowing integers larger than intmax_t by not defining a corresponding INT_<size>_MAX and keeping the limit of the preprocessor to intmax_t? INT_MAX is useful because the size of an int isn't fixed. But you know the max of a uint128_t.

          1 reply 0 retweets 1 like
        4. Rich Felker‏ @RichFelker Aug 28
          Replying to @stevecheckoway @stephentyrone and

          Arguably, since the standard requires INTnnn_MAX to be defined if intnnn_t is, I think it's valid for the application to use the identifier intnnn_t if INTnnn_MAX is not defined... ;-)

          2 replies 0 retweets 3 likes
        5. Steve Canon‏ @stephentyrone Aug 28
          Replying to @RichFelker @stevecheckoway and

          File this one away for adversarial C implementations.

          1 reply 0 retweets 6 likes
        6. Rich Felker‏ @RichFelker Aug 28
          Replying to @stephentyrone @stevecheckoway and

          Something like this would actually not be so unreasonable when coding for halfass support of legacy C89-ish compilers: #if !defined(INT32_MIN) && INT_MIN==-1-2147483647 typedef int int32_t; #define INT32_MIN INT_MIN #define INT32_MAX INT_MAX #endif

          0 replies 0 retweets 3 likes
        7. End of conversation
        1. New conversation
        2. JF Bastien‏ @jfbastien Aug 28
          Replying to @RichFelker @stevecheckoway and

          We could add "Even More Extended Integer Type" to the language.pic.twitter.com/khsEXJiIlL

          1 reply 0 retweets 3 likes
        3. Ghost of Architectures Past‏ @MiodVallat Aug 28
          Replying to @jfbastien @RichFelker and

          BigInt or dust.

          2 replies 0 retweets 3 likes
        4. Brendan G Bohannon‏ @cr88192 Aug 28
          Replying to @MiodVallat @jfbastien and

          An open question here would be is if it would be a truly variable-sized BigInt, or just a fixed size but absurdly large BigInt (ex: 2048 bit), or "fixed size up to N, overflows to heap". Pros/cons either way...

          0 replies 0 retweets 1 like
        5. End of conversation

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