Jakob Stoklund Olesen 40c6fb397d Create a struct representing register units in TableGen.
Besides the weight, we also want to store up to two root registers per
unit. Most units will have a single root, the leaf register they
represent. Units created for ad hoc aliasing get two roots: The two
aliasing registers.

The root registers can be used to compute the set of overlapping
registers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156792 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-15 00:50:23 +00:00
..
2012-04-03 23:09:22 +00:00
2012-03-23 05:50:46 +00:00
2012-04-17 17:21:17 +00:00