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203 Commits

Author SHA1 Message Date
Chris Lattner 9c1f1a82bf we can only thread blocks when there is a pred we can determine the succ of. 
llvm-svn: 50003
 2008-04-20 21:18:09 +00:00
Chris Lattner 2115722ffa improve comments, infrastructure, and add some validity checks for threading. 
Add a cost function.

llvm-svn: 50002
 2008-04-20 21:13:06 +00:00
Chris Lattner b3b6007c8b Add a new Jump Threading pass, which will handle cases 
such as those in PR2235.  Right now the pass is not very
effective. :)

llvm-svn: 50000
 2008-04-20 20:35:01 +00:00