Jakob Stoklund Olesen ead06be02f 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105369 91177308-0d34-0410-b5e6-96231b3b80d8

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

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