Re: [Boost-users] run-time integer log2

Subject: Re: [Boost-users] run-time integer log2
From: Vicente Botet Escriba (vicente.botet_at_[hidden])
Date: 2010-07-13 11:13:09

Bugzilla from tim_at_[hidden] wrote:
> 
>> there is a GSOC project "Bits and Ints" that is working on a lot off this
>> kind of branch less algorithms. I can suggest him to include the integer
>> runtime variant of some math functions, as log2.
> 
> that would be nice ... it would be even nicer, if you could suggest to
> make 
> use of hardware instructions ... i am currently using this gcc-centric
> code 
> [1] ...
> 
> tim
> 
> [1] 
> http://tim.klingt.org/git?p=boost_heap.git;a=blob;f=boost/heap/detail/ilog2.hpp
> 
> 

The GSOC project will make first a portable implementation. Once the
portable implementation is finished, other architecture dependent
implementation could be benchmarked and provided if they give better
performances.

Best,
Vicente

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