Jakob Stoklund Olesen 366bd86335 Generate a table-driven version of TRI::composeSubRegIndices().
Explicitly allow composition of null sub-register indices, and handle
that common case in an inlinable stub.

Use a compressed table implementation instead of the previous nested
switches which generated pretty bad code.

llvm-svn: 167190
2012-11-01 00:32:10 +00:00
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