Jakob Stoklund Olesen 4cf8fe31bb Be more strict about detecting multi-use blocks for isolation. ...

When a block has exactly two uses and the register is both live-in and live-out,
don't isolate the block. We would be inserting two copies, so we haven't really
made any progress.

If the live-in and live-out values separate into disconnected components after
splitting, we would be making progress. We can't detect that for now.

llvm-svn: 117169

2010-10-22 22:48:56 +00:00

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