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Re^4: Efficient code.

by Aristotle (Chancellor)
on Jan 30, 2006 at 20:56 UTC ( #526561=note: print w/replies, xml ) Need Help??


in reply to Re^3: Efficient code.
in thread Efficient code.

Cool!

Old geezer moment: sometimes these optimisations make me feel like I did when I was writing assembly code (inner loops of texture mappers slinging pixels… unrolling carefully, rejoicing when a clever trick got your loop down from 11 to 9 cycles per pixel – those were the days) and went from Pentium to PentiumPro – suddenly it was no longer possible to measure how many clock cycles any one instruction took: an innocuous change somewhere up or down the line would sometimes dramatically change the time response of an unrelated instruction, occasionally a loop iteration would randomly take more or less cycles than average, and sometimes instructions would appear to take a fractional amount of cycles. It was like wading through quicksand.

Of course, there was no way to inspect the result of the PPro’s µ-Op translator. Thank goodness for use re 'debug'; :-)

Makeshifts last the longest.

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[marioroy]: Is List::Util::XS a core Perl module?
[stevieb]: corelist List::Util::XS says "List::Util::XS was first released with perl v5.10.1"
[stevieb]: so yes, since v5.10.1 :)
[MidLifeXis]: According to [metaperl:// corelist], Perl 5.10.1
Lady_Aleena blurbles. One of her favorite modiles is now in "maintenance mode" in favor of a new fangled module.
[MidLifeXis]: D'oh. Slow out of the gate.
[marioroy]: Thanks stevieb, MidLifeXis.

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