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Author SHA1 Message Date
Jakub Staszak d184e2decc Add some constantness. 
llvm-svn: 188844
 2013-08-20 23:04:15 +00:00
Nick Lewycky 8d2e86db5a Fix an oversight in isPotentiallyReachable where we wouldn't do any CFG-walking 
to find loops if the From and To instructions were in the same block.

Refactor the code a little now that we need to fill to start the CFG-walking
algorithm with more than one starting basic block sometimes.

Special thanks to Andrew Trick for catching an error in my understanding of
natural loops in code review.

llvm-svn: 188236
 2013-08-13 00:03:47 +00:00
Nick Lewycky 0b68245ec8 Reimplement isPotentiallyReachable to make nocapture deduction much stronger. 
Adds unit tests for it too.

Split BasicBlockUtils into an analysis-half and a transforms-half, and put the
analysis bits into a new Analysis/CFG.{h,cpp}. Promote isPotentiallyReachable
into llvm::isPotentiallyReachable and move it into Analysis/CFG.

llvm-svn: 187283
 2013-07-27 01:24:00 +00:00