It's a value judgement. I thought you valued a routine that works on arbitrary input. You value speed. Evidently, creating the array in my routine is an expensive proposition.

I don't have time right now, but try recasting my algorithm to use index or substr. If you're really pressed for speed, a short XS routine should do the trick.

• another intruder with the mooring in the heart of the Perl

In reply to Re^5: bit pattern to bit position mapping by grinder
in thread bit pattern to bit position mapping by Anonymous Monk

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