Jakob Stoklund Olesen 818e4df2b4 Use readsWritesVirtualRegister instead of counting uses and defs when inserting ...

spills and reloads.

This means that a partial define of a register causes a reload so the other
parts of the register are preserved.

The reload can be prevented by adding an <imp-def> operand for the full
register. This is already done by the coalescer and live interval analysis where
relevant.

llvm-svn: 105369

2010-06-03 00:07:47 +00:00

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