Adam Nemet bbb141c734 Add new pass LazyMachineBlockFrequencyInfo ...

And use it in MachineOptimizationRemarkEmitter.  A test will follow on top of
Justin's changes to enable MachineORE in AsmPrinter.

The approach is similar to the IR-level pass.  It's a bit simpler because BPI
is immutable at the Machine level so we don't need to make that lazy.

Because of this, a new function mapping is introduced (BPIPassTrait::getBPI).
This function extracts BPI from the pass.  In case of the lazy pass, this is
when the calculation of the BFI occurs.  For Machine-level, this is the
identity function.

Differential Revision: https://reviews.llvm.org/D29836

llvm-svn: 295072

2017-02-14 17:21:09 +00:00

2.7 KiB

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