Kai Luo dec624682e [MachineCSE][MachinePRE] Avoid hoisting code from code regions into hot BBs. ...

Summary:
Current PRE hoists common computations into
CMBB = DT->findNearestCommonDominator(MBB, MBB1).
However, if CMBB is in a hot loop body, we might get performance
degradation.

Differential Revision: https://reviews.llvm.org/D64394

llvm-svn: 366570

2019-07-19 12:58:16 +00:00

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