Change the createSpiller interface to take a MachineFunctionPass argument.

The spillers can pluck the analyses they need from the pass reference.

Switch some never-null pointers to references.

llv

Change the createSpiller interface to take a MachineFunctionPass argument.

The spillers can pluck the analyses they need from the pass reference.

Switch some never-null pointers to references.

llvm-svn: 108969

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Implement loop splitting analysis.
Determine which loop exit blocks need a 'pre-exit' block inserted.
Recognize when this would be impossible.

llvm-svn: 108941

Appease the colonials.

llvm-svn: 108845

Beginning SplitKit - utility classes for live range splitting.

This is a work in progress. So far we have some basic loop analysis to help
determine where it is useful to split a live range around a

Beginning SplitKit - utility classes for live range splitting.

This is a work in progress. So far we have some basic loop analysis to help
determine where it is useful to split a live range around a loop.

The actual loop splitting code from Splitter.cpp is also going to move in here.

llvm-svn: 108842

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