This is the use case I had in mind when we were working on the log2 kernel. Binary logs are the fastest log to compute (for floating point numbers) because of Marcus' explanation. I even wrote the NEON log2 proto-kernel so that the computation can be in-lined in other kernels in the future to avoid the overhead of multiple calls for a determined person that thought it was an issue.
-nw On Wed, Sep 16, 2015 at 12:50 AM, Brian Padalino <bpadal...@gmail.com> wrote: > On Wed, Sep 16, 2015 at 12:24 AM, Dennis Glatting <gnura...@pki2.com> > wrote: > > > > 1) Working with VOLK to learn VOLK. > > 2) Having fun with vectors. > > 3) Generating power data points for plotting across a selected > > set of samples. > > Lastly, another alternative, if you wanted to utilize what is already > there in VOLK, if you wanted to do something like 10*log10(x), you can > also think of it as 10*log2(x)/log2(10) - rewritten to put the > constants together - 10*log2(10)*log2(x), where 10*log2(10) is > 3.01029995664. > > So convert a vector of floats into log2 then multiply a vector by a > const that is equal to 10*log2(10) to get them to their final value. > Not as efficient, potentially, but still an option if you want to > learn VOLK. > > Brian > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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