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Commit a1968b0f authored by Evan Cheng's avatar Evan Cheng
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Implement PR3495: local spiller optimization. The local spiller can now keep...

Implement PR3495: local spiller optimization. The local spiller can now keep availability information over BB boundaries. It visits BB's in depth first order. After visiting a BB if it find a successor which has a single predecessor it visits the successor next without clearing the availability information. This allows the successor to omit reloads or change them into copies.

llvm-svn: 64298
parent 345749af
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