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It also means that the behavior needs to be stable across time and that tools cannot report this behavior as a bug.

• aw1621107 2mo ago
  > It also means that the behavior needs to be stable across time I don't think IB has to be stable over time? For instance, whether and which extended integer types exist is IB and that has definitely changed over time. > and that tools cannot report this behavior as a bug. It's absolutely possible to report IB as a bug (or even fully-specified behavior, as demonstrated by -fsanitize=unsigned-integer-overflow or -fsanitize=implicit-integer-conversion).
  • UncleMeat 2mo ago
    IB is something that developers can rely on. If it changes out from under you thats a bug.
    • aw1621107 2mo ago
      To the extent that implementations promise, sure. But that is beyond the scope of the standard.