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Author SHA1 Message Date
Tim Northover 33b07d6725 GlobalISel: implement legalization pass, with just one transformation. 
This adds the actual MachineLegalizeHelper to do the work and a trivial pass
wrapper that legalizes all instructions in a MachineFunction. Currently the
only transformation supported is splitting up a vector G_ADD into one acting on
smaller vectors.

llvm-svn: 276461
 2016-07-22 20:03:43 +00:00
Tim Northover 75ad077330 GlobalISel: implement Legalization querying framework. 
This adds an (incomplete, inefficient) framework for deciding what to do with
some operation on a given type.

llvm-svn: 276184
 2016-07-20 21:13:29 +00:00