This patch adds the basic API for the Legality component of the
vectorizer. It also adds some very basic code in the bottom-up
vectorizer that uses the API.
A region identifies a set of vector instructions generated by
vectorization passes. The vectorizer can then run a series of
RegionPasses on the region, evaluate the cost, and commit/reject the
transforms on a region-by-region basis, instead of an entire basic
block.
This is heavily based ov @vporpo's prototype. In particular, the doc
comment for the Region class is all his. The rest of this commit is
mostly boilerplate around a SetVector: getters, iterators, and some
debug helpers.
This patch adds support for a user-defined pass-pipeline that overrides
the default pipeline of the vectorizer.
This will commonly be used by lit tests.
This patch implements a new empty pass for the Bottom-up vectorizer and
creates a pass pipeline that includes it.
The SandboxVectorizer LLVM pass runs the Sandbox IR pass pipeline.
This patch implements the new pass and registers it with the pass
manager. For context, this is a vectorizer that operates on Sandbox IR,
which is a transactional IR on top of LLVM IR.
