#4968: switch Matrix_modn_dense from ints to CPU longs
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Reporter: malb | Owner: was
Type: enhancement | Status: new
Priority: major | Milestone: sage-wishlist
Component: linear algebra | Resolution:
Keywords: |
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Comment (by mabshoff):
Replying to [comment:3 was]:
> > How about "long long" across the board?
>
> Won't that have negative implications. For example, on a 32-bit machine
all matrices will take twice as much memory to store, and all arithmetic
will be an order of magnitude slower. That certainly wouldn't make me
happy!
Well, assuming we will transparently switch over to another implementation
(using gmpz's for example) we should use the "fast" integer type, i.e. 32
bit ints and a 64 bit int type on 64 bit boxen. But my original point
remains: On
* 64 bit Solaris
* 64 bit Windows
sizeof(long) == sizeof(int) == 4, so using either a C99 type or some
platform dependent typedef is what we need here to get optimum performance
on all 64 bit platforms. Since we are already requiring C99 due to FLINT
we might as well go for that solution.
Cheers,
Michael
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4968#comment:4>
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