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edgefreqs
2011 Jun 04
3
[LLVMdev] [llvm-commits] Branch Probability
...nch probability.
** Block Frequency
The result produced by BlockFrequencyAnalysis for mid-level IR and MBBFrequencyAnalysis for MachineInstrs with mostly shared implementation across IR and MI.
Conceptually, this is a floating point value that satisfies the closed form:
frequency(block) == (sum edgeFrequency(pred, block) for pred in block.preds())
Where "edge frequency" is defined as:
edgeFrequency(src, dest) == frequency(src) * edgeProbability(src, dest)
Representation: 32-bit unsigned int "scaled frequency" per block
For the purpose of diagnostics, the entry block always...