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Andrew Trick 6b7d15e240 Added register unit sets to the target description.
This is a new algorithm that finds sets of register units that can be
used to model registers pressure. This handles arbitrary, overlapping
register classes. Each register class is associated with a (small)
list of pressure sets. These are the dimensions of pressure affected
by the register class's liveness.

llvm-svn: 154374
2012-04-10 02:25:24 +00:00
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