[RFC] Tracer documentation

[Jan Hubicka]

Hi,
I am sending this document as an experiment.  The CFG branch work has
been done from major part as student software project and thus we were
required to write documentation.  The documentation contain description
of each optimization pass we've implemented, programmer's
documentation for CFG datasturctures and short sumarry of reached goals
(effectivity of the optimizations based on Andrea's SPEC2000
benchmarks).

I don't think it is practical do keep whole documentation as it is, as
it will not match any of official GCC version.  I plan to convert the
CFG part from latex to texinfo and try to put it as part of GCC
internals manual, but I am not sure what to do with the rest.

I don't think it is practical to put it into the documentation as it is
dificult to maitain up-to-date.  So I've split out the chapter about
the tracer pass I sent into the mainline into separate article.  Perhaps
it can be usefull to put them separately somewhere on the web pages, or
link from news if the new pass will get approved.

What do you think?
Honza
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