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Author SHA1 Message Date
Chris Lattner
86a5323f04 - Simplify PatternMatch to *require* static benefits at pattern construction 
time.  The "Fast and Flexible Instruction Selection With Constraints" paper
  from CC2018 makes a credible argument that dynamic costs aren't actually
  necessary/important, and we are not using them.

- Check in my "MLIR Generic DAG Rewriter Infrastructure" design doc into the
  source tree.

PiperOrigin-RevId: 221017546
 2019-03-29 13:54:38 -07:00
Chris Lattner
7de0da9594 Refactor all of the canonicalization patterns out of the Canonicalize pass, and 
make operations provide a list of canonicalizations that can be applied to
them.  This allows canonicalization to be general to any IR definition.

As part of this, sink PatternMatch.h/cpp down to the IR library to fix a
layering problem.

PiperOrigin-RevId: 218773981
 2019-03-29 13:39:49 -07:00