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3 Commits

Author SHA1 Message Date
Jakob Stoklund Olesen
b530849e81 Precompute interference for neighbor blocks as long as there is no interference. 
This doesn't require seeking in the live interval union, so it is very cheap.

llvm-svn: 129187
 2011-04-09 02:59:05 +00:00
Jakob Stoklund Olesen
aace1636b6 Avoid moving iterators when the previous block was just visited. 
llvm-svn: 129081
 2011-04-07 17:27:50 +00:00
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