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Author SHA1 Message Date
Daniel Berlin eafdd862e5 NewGVN: Fix PR/33187. This is a bug caused by two things: 
1. When there is no perfect iteration order, we can't let phi nodes
put themselves in terms of things that come later in the iteration
order, or we will endlessly cycle (the normal RPO algorithm clears the
hashtable to avoid this issue).
2. We are sometimes erasing the wrong expression (causing pessimism)
because our equality says loads and stores are the same.
We introduce an exact equality function and use it when erasing to
make sure we erase only identical expressions, not equivalent ones.

llvm-svn: 304807
 2017-06-06 17:15:28 +00:00
Daniel Berlin e67c322260 NewGVN: Fix PR 33119, PR 33129, due to regressed undef handling 
Fix PR33120 and others by eliminating self-cycles a different way.

llvm-svn: 303875
 2017-05-25 15:44:20 +00:00
Daniel Berlin 9d0796e5d0 NewGVN: Fix PR32403 - Handling of undef in phis was not quite correct 
due to LLVM's view of phi nodes.  It would cause NewGVN not to fixpoint
in some interesting edge cases.

llvm-svn: 298687
 2017-03-24 05:30:34 +00:00