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Postings from June 2015
Allow me to attempt a summary of discussion so far.
- for the negative shifts, going the opposite direction makes the most sense
- (if someone still wants the odd modulo thing, they can explicitly
do the modulo for the shift)
- for the "left overshift" the best option would be the one we cannot
take, that is, go bigint
- since we cannot do the best, just going zero is the next best option
- for the "right overshift", going zero is the most natural (and
mirrors the above choice for "left overshift")
- for "use integer" we should treat the number as signed integer
- if the integer is positive, the above policies (which are for
unsigned integers) work fine
- if the integer is negative...
- the "left overshift" should also zero
- the "right overshift" should return -1 (as weird as it is)...
but there's a dilemma
that currently the shifts cast to UV (undocumented, but most
probably some code
somewhere would freak out if we started preserving the signedness)
- we should avoid annoying warnings if feasible
- we should avoid leaking wordsize (# of bits) if feasible
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