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2 Commits

Author SHA1 Message Date
Jakob Stoklund Olesen 8bde4c078b Fix typos. 
llvm-svn: 151163
 2012-02-22 16:01:54 +00:00
Jakob Stoklund Olesen 3a0f01f734 Add a Briggs and Torczon sparse set implementation. 
For objects that can be identified by small unsigned keys, SparseSet
provides constant time clear() and fast deterministic iteration. Insert,
erase, and find operations are typically faster than hash tables.

SparseSet is useful for keeping information about physical registers,
virtual registers, or numbered basic blocks.

llvm-svn: 151110
 2012-02-22 00:56:08 +00:00