[llvm-dev] How to run all available optimisations

[Russell Wallace via llvm-dev]

Given a generated module in memory, how do you run all available
optimisations on it?

Tutorial section 4.3 at http://llvm.org/docs/tutorial/LangImpl4.html picks
out just a few optimisations, which makes sense for a JIT compiler on short
running code, but I'm looking at long-running code where it would be
worthwhile to start off applying all of them and possibly selectively
disable any that turn out not to be useful.

C:\llvm\tools\opt\opt.cpp seems to be a program that runs optimisations
from IR to IR, and perhaps runs all of the applicable ones; main() seems to
contain a list of optimisation pass initialisations (though only the ones
applicable where we aren't generating machine code yet). Would copy-pasting
the code from that file be the right starting point?

On the other hand, if so, I would have expected that code to occur again in
the clang source tree, because clang likewise has a -O3 option, but it
doesn't seem to. That suggests to me that I'm confused about how things are
organized. What am I missing?
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