As has been suggested by Duncan and others, Early-CSE and GVN should
do similar redundancy elimination, but Early-CSE is much less expensive.
Most of my autovectorization benchmarks show a performance regresion, but
all of these are < 0.1%, and so I think that it is still worth using
the less expensive pass.

llvm-svn: 154673

llvm-svn: 153902

llvm-svn: 153353

This is the initial checkin of the basic-block autovectorization pass along with some supporting vectorization infrastructure.
Special thanks to everyone who helped review this code over the last several months (especially Tobias Grosser).

llvm-svn: 149468

EP_ModuleOptimizerEarly, to allow passes to be added before the
main ModulePass optimizers.

llvm-svn: 148329

llvm-svn: 146037

llvm-svn: 145530

Add a mechanism for optimisation plugins to register passes that all front ends can use without needing to be aware of the plugin (or the plugin be aware of the front end).

Before 3.0, I'd like to add a mechanism for automatically loading a set of plugins from a config file.  API suggestions welcome...

llvm-svn: 137717

functionality since in the C api a pass is created and added to a pass
manager in a single call.

llvm-svn: 137159

llvm-svn: 136727