Jakob Stoklund Olesen 4f7fd3baeb Fix liveness calculation when splitting critical edges during PHI elimination. ...

- Edges are split before any phis are eliminated, so the code is SSA.

- Create a proper IR BasicBlock for the split edges.

- LiveVariables::addNewBlock now has same syntax as
  MachineDominatorTree::addNewBlock. Algorithm calculates predecessor live-out
  set rather than successor live-in set.

This feature still causes some miscompilations.

llvm-svn: 86867

2009-11-11 19:31:31 +00:00

25 KiB

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