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3 Commits

Author SHA1 Message Date
Arnold Schwaighofer
6466da193f Add a SILSSAUpdate utility 
This is using LLVM's SSAUpdater utility.

I had to abstract it a little further because our 'phi' nodes are slightly
different. The SSAUpdater needs to iterate over phis in a basic block so I
abstracted this in a trait. Therefore, this commit needs a recent version of
puzzle/master which has this change applied.

Swift SVN r19634
 2014-07-07 21:05:22 +00:00
Chris Lattner
681ad64db3 teach simplifycfg's dead block deletion to correctly handle blocks with 
instructions that are used cross-block.


Swift SVN r9788
 2013-10-30 14:23:51 +00:00
Chris Lattner
ef93c81ffb Introduce a new SIL-level "undef" value, useful for SIL transformations. 
IRGen support is missing, Joe volenteers to implement it.


Swift SVN r9776
 2013-10-30 00:58:09 +00:00