[llvm-commits] [patch]: Fix regalloc issue with splitting range of spilling registers

[Peter Cooper]

Hi

Please review the attached patch which fixes a register allocator issue that came up in clang self hosting.

The problem is that if we create new intervals for registers that are currently being spilled then the new intervals might not spill.  Any reads from the spilled location then won't get the value from the non-spilled locations.

The patch fixes this by avoiding creating the new intervals when they are for a spilling register.

Thanks,
Pete

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