I have a very naive question. I am playing around with binary
quadratic forms and have a large array of values. I loop through a,b,c
and, for each triple, compute some quantity that depends on a,b,c.
Then, in the inner most c loop, I wish to increment value[d], where
d=4ac-b^2, by that quantity.
I am finding that the step
value[d]+= quantity;
is taking way too long, presumably because, as c increments by 1,
d=4ac-b^2, increments by a large amount, 4a, so the way that the array
is read into the cache in chunks of consecutive array entries, is
useless here.
Is there a way in c or c++ to control what parts of an array get read
into cache. For example can
I ***efficiently*** read/manipulate equally spaced entries (spaced
apart by 4a) of my value array into cache rather than the default
consecutive entries.
Any tips would be greatly appreciated.
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