Jakob Stoklund Olesen bc630aca39 Be more clever about calculating live variables through new basic blocks. ...

When splitting a critical edge, the registers live through the edge are:

- Used in a PHI instruction, or
- Live out from the predecessor, and
- Live in to the successor.

This allows the coalescer to eliminate even more phi joins.

llvm-svn: 89530

2009-11-21 02:05:21 +00:00

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