Comments (6)
This is by design. fcollapse
is smarter than gcollapse
in assigning small variable types while preventing overflow. I do not think this is feasible for me, however, because I have to create the typed variable before doing any operations. This is the smartest I could be:
- For bytes, I can use
int
as the target type for N up to 327. - For int, I can use
long
as target for N up to 65,592.
These are relatively small Ns, so I didn't think to check. Past that, I would risk overflows because I don't know the result until after I compute the sum. An int can hold integers up to 2^15-28
, and past 65,592
obs a long
would overflow.
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Not automatic, but perhaps faster than compress: I could add an option so that instead of assuming the worst possible theoretical case I check the range (or maybe even the sum, since I'd be looping over the variable anyway) and then decide the type based on that. Good compromise? It would still involve some overhead but maybe not as much. Let me know.
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This is in the develop
branch; will hit master when I get a chance to run the tests. You should be able to try it out via
gtools, upgrade branch(develop)
Add option sumcheck
to gcollapse
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Note to self: This is still a problem with weights, where a sum might overflow but it is not detected.
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