Shifts vs Additions

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I was told that shifts were faster then additions but the pdf
"How to optimize for the Pentium® microprocessors" from
http://www.agner.org/assem/ says that shifts should be avoided on
Pentinum 4 and additions should be used instead. Which is right?

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nectodn

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Mar 7th, 2006

Re: Shifts vs Additions

>Which is right?
Both. Any decent processor will show that shifts are faster, but the Pentium 4 is gimped in this case.

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