spupyrev 1256ef274c [BOLT] Fine-tuning hash computation for stale matching ...

Fine-tuning hash computation for stale matching:
- introducing a new "loose" basic block hash that allows to match many more blocks than before;
- tweaking params of the inference algorithm that find (slightly) better solutions;
- added more meaningful tests for stale matching.

Tested the changes on several open-source benchmarks (clang, rocksdb, chrome)
and one prod workload using different compiler modes (LTO/PGO etc). There is
always an improvement in the quality of inferred profiles.
(The current implementation is still not optimal but the diff is a step forward;
I am open to further suggestions)

Reviewed By: Amir

Differential Revision: https://reviews.llvm.org/D156278

2023-08-31 07:29:02 -07:00

5.3 KiB

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