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Author SHA1 Message Date
Manman Ren 93ab64916f SimplifyCFG: sink common codes from IF, ELSE blocks down to END block. 
We already have HoistThenElseCodeToIf, this patch implements
SinkThenElseCodeToEnd. When END block has only two predecessors and each
predecessor terminates with unconditional branches, we compare instructions in
IF and ELSE blocks backwards and check whether we can sink the common
instructions down.

rdar://12191395

llvm-svn: 164325
 2012-09-20 22:37:36 +00:00