Michael Zolotukhin 963a6d9c69 Revert "Revert "[Unroll] Implement a conservative and monotonically increasing cost tracking system during the full unroll heuristic analysis that avoids counting any instruction cost until that instruction becomes "live" through a side-effect or use outside the..."" ...

This reverts commit r269395.

Try to reapply with a fix from chapuni.

llvm-svn: 269486

2016-05-13 21:23:25 +00:00

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