Thanks! Re this point >>BTW: You still haven't mentioned what the "complex processing" you are performing in XS is?<< -- sorry, not trying to be mysterious, was just trying to keep the question focused!

One real example is this: there are 2 bit vectors of different sizes (each in the range of 1-8m bits) with irregular, many-to-many relationships between the bits in each vector. (The relationships are represented separately by a long array of pairs of ints.) One real function is to find every set bit in vector A, then set the corresponding bit(s) in vector B.

So: simple bitwise ops are out of the question because the vectors are of different sizes. I coded it first in pure Perl using the vec() function, but it was pretty slow (one call to vec() to test/set each bit). So, I switched to Inline::C for the heavy lifting and it's now over 20x faster (ie. the entire test/set loop inside one C function).

In reply to Re^6: Bit vector fiddling with Inline C by oxone
in thread Bit vector fiddling with Inline C by oxone

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