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Author SHA1 Message Date
Jakob Stoklund Olesen 41ebcda8f4 Add a test case for global live range splitting. 
llvm-svn: 157357
 2012-05-23 23:42:23 +00:00
Jakob Stoklund Olesen 0ce90494e6 Add a last resort tryInstructionSplit() to RAGreedy. 
Live ranges with a constrained register class may benefit from splitting
around individual uses. It allows the remaining live range to use a
larger register class where it may allocate. This is like spilling to a
different register class.

This is only attempted on constrained register classes.

<rdar://problem/11438902>

llvm-svn: 157354
 2012-05-23 22:37:27 +00:00