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I’ve been playing around with optimizing performance various passes and noticed something about ADCE: it keeps an Alive set that requires a lot of upkeep time-wise, but if each instruction had a /single bit/ of side data (to represent liveness, solely within the pass), the set wouldn’t be needed. I tested this out and observed a ~1/3 reduction in time in ADCE: 1454ms to 982ms according to a

...ld shall compare equal. If the value of >> an enu-merator is stored into a bit-field of the same enumeration type >> and the number of bits in the bit-field is large enough to hold all >> the values of that enumeration type, the original enumerator value and >> the value of thebit-field shall compare equal. >> ... This suggests that Standard C++ permits enums to have bitfield modifiers. However, as far as I know, there are not yet any Standard C++ compilers available on any platform. I could not find definitive language in ISO/IEC 9899-1999, the 1999 C Standard on t...