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2016 Nov 01
2
(RFC) Encoding code duplication factor in discriminator
If Hal's proposal is for SamplePGO purpose, let me clarify some design principles of SamplePGO. The profile for sample pgo uses source location as the key to map the execution count back to IR. This design is based on the principle that we do not want the profile to be tightly couple with compiler IR. Instead, profile is simple an attribute of the source code. We have been benefited a lot