quick quiz! which are incorrect and why cc @spun_offpic.twitter.com/swiTYVVMmb
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@RichFelker C interpreters that manipulate symbolic representations agree to disagree with you about the cleanliness of that last one.
@RichFelker The results of all intermediate expressions in past examples could be encoded as base_address + offset. Not so for -(uintptr_t)p
@spun_off Mine is the only one where the compiler can legitimately assume rules of pointer arithmetic hold (because it's ptr arith.).
@spun_off The other forms all do the arithmetic as a uint type where any operation is well-defined. Final ptr may point to different object.
@spun_off In this specific case, the offset is bounded [0,7] and the compiler can deduce that it's still in the same object, tho.
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