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
