OKay. After walking away for a while the penny dropped. Use vec instead of unpack and avoid map and a slice by unwinding the loop.

Addition to the benchmark above.

    vec_x4
    => q[ @nybbles = (vec($n, 2, 4), vec($n, 3, 4), vec($n, 0, 4), vec
+($n, 1, 4)); ],

[download]

Results for comparison with those above

vec_x4    42230/s   490%   319%   231%  230%  176%  --

[download]

Which by my reckoning, (15328*20210)/8188 = 37833 -v- 42230 makes this around 10% faster than the Inline-C version, thought the difference will probably be absorbed once its wrapped in a function as that is. Still, Perl wins again.

I'd still like to see the XS version.

Examine what is said, not who speaks.

The 7th Rule of perl club is -- pearl clubs are easily damaged. Use a diamond club instead.

In reply to Re: Nybbles take to long (Solved?) by BrowserUk
in thread Nybbles take to long by BrowserUk

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