Amir Ayupov 7b750943d7 [BOLT][NFC] Speedup YAML profile processing ...

Reduce YAML profile processing times:
- preprocessProfile: speed up buildNameMaps by replacing ProfileNameToProfile
  mapping with ProfileFunctionNames set and ProfileBFs vector.
  Pre-look up YamlBF->BF correspondence, memoize in ProfileBFs.
- readProfile: replace iteration over all functions in the binary by iteration
  over profile functions (strict match and LTO name match).

On a large binary (1.9M functions) and large YAML profile (121MB, 30k functions)
reduces profile steps runtime:
pre-process profile data: 12.4953s -> 10.7123s
process profile data: 9.8195s -> 5.6639s

Compared to fdata profile reading:
pre-process profile data: 8.0268s
process profile data: 1.0265s
process profile data pre-CFG: 0.1644s

Reviewed By: #bolt, maksfb

Differential Revision: https://reviews.llvm.org/D159460

2023-09-11 16:07:57 -07:00

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