|Pathologically Eclectic Rubbish Lister|
Re^2: Efficient bit-twiddling in Perl.by BrowserUk (Pope)
|on Mar 01, 2013 at 13:39 UTC||Need Help??|
I fed your JustShift solution (a cute bit of lateral thinking :), into my benchmark and on my hardware it is a tad slower than shift&and:
I was a bit surprised by that as both shift & and are designated as single clock operations on my cpu. I guess the difference is in the perl operations that overlay them.
I follow your drift regarding the effect that assignment and stack handling can have on a benchmark of this nature; but the values are re-used several times through the rest of the body of the inner loop, so the assignment is a constant factor that I've chosen to exclude.
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