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Re: [PATCH][RFC] Statistics "infrastructure"


Hi,

> This is an attempt to provide (pass) statistics collection.  The
> goal is to provide infrastructure to handle the current (pass specific)
> statistics dumping that is done per function and per pass along the
> regular tree/rtl dumps as well as to allow CU wide "fancy" analysis.
> 
> The most important aspect I think is simplicity to use it and especially
> add new "counters".  Thus, we simply associate a counter with a string ID.
> 
> The patch is a rough implementation of the current features of
> pass specific statistics plus a global "log" with statistics events.
> In the end you can do any postprocessing / globbing / summing of
> such global log.
> 
> A statistics event consists of a function (optional), a statement
> (optional) and the counter ID.  I converted the counters from
> tree-ssa-propagate.c as an example, instead of
> 
> 		prop_stats.num_copy_prop++;
> 
> you now write
> 
> 		statistics_add ("copy propagations");
> 
> (function and statement omitted, you might prefer #defines for strings
> that you use multiple times).

it would perhaps be better to use #defines with integer values?  Also,
it would be more consistent to have statistics.def similar to
timevar.def for this.  It would make creation of new counters a bit
more difficult, but on the other hand, it would make it possible to
classify the counters (by type of the counted operation/its
expensiveness/...),

Zdenek


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