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Jakob Stoklund Olesen
548643c573
Extract spill cost calculation to a new method, and use definePhysReg() to clear
out aliases when allocating. Clean up allocVirtReg(). Use calcSpillCost() to allow more aggressive hinting. Now the hint is always taken unless blocked by a reserved register. This leads to more coalescing, lower register pressure, and less spilling. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103939 91177308-0d34-0410-b5e6-96231b3b80d8
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