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Author SHA1 Message Date
Jakob Stoklund Olesen
f881310607 Add an InterferenceCache class for caching per-block interference ranges. 
When the greedy register allocator is splitting multiple global live ranges, it
tends to look at the same interference data many times. The InterferenceCache
class caches queries for unaltered LiveIntervalUnions.

llvm-svn: 128764
 2011-04-02 06:03:35 +00:00