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Re: [rtlopt] Value profiling and optimalizations


> > Hello,
> > 
> > > >   #define GCOV_TAG_LOOP_HISTOGRAMS ((unsigned)0x01a30000)
> > > > + #define GCOV_TAG_VALUE_HISTOGRAMS ((unsigned)0x01a50000)
> > > What makes value histograms different from loop histograms for gcov?
> > > It would perhaps make sense to comonize more of the loop and value
> > > histograms code.
> > 
> > There is nothing different in them; I use different tags because loop
> > histograms and value histograms may be used independently (or both
> > together). A bit more of the code could indeed be shared (mostly the parts in
> > libgcc2.c).
> Hmm, I am not sure, but perhaps it would make more sense if profiling code
> allowed measuring histogram of any quantities and loop code just used it
> for the iteration counts and other code for other values?

It already uses the same code for measuring the histograms; I definitely
want to keep the counters separated, but I am going to rewrite the
libgcc part soon so that the storing is done in a more generic way.

Zdenek


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