Michael Liao 5313da3263 [SimplifyCFG] Revise common code sinking ...

- Fix the case where more than 1 common instructions derived from the same
  operand cannot be sunk. When a pair of value has more than 1 derived values
  in both branches, only 1 derived value could be sunk.
- Replace BB1 -> (BB2, PN) map with joint value map, i.e.
  map of (BB1, BB2) -> PN, which is more accurate to track common ops.

llvm-svn: 224757

2014-12-23 08:26:55 +00:00

1.9 KiB

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