Jakob Stoklund Olesen 0fb215a154 Don't add live ranges for sub-registers when clobbering a physical register. ...

Both coalescing and register allocation already check aliases for interference,
so these extra segments are only slowing us down.

This speeds up both linear scan and the greedy register allocator.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129283 91177308-0d34-0410-b5e6-96231b3b80d8

2011-04-11 18:08:10 +00:00

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