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ldensity
2013 Dec 24
2
[LLVMdev] Quirk in switch lowering
Hello all,
in SelectionDAGBuilder::handleBTSplitSwitchCase
(lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp) seems to be a quirk
which can effectively create an else-if chain from a very sparse switch
statement instead of a balanced binary tree.
A possible solution is to weight an isolated single switch label with 0.
To do this one can replace the assignments to LDensity und RDensity by: