[issue37774] Micro-optimize vectorcall using PY_LIKELY

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

> That's certainly true. The question is whether we want to optimize also non-PGO builds.

If it's an optimization, can you show a benchmark to validate that it's really faster as expected?

I tried for 6 months to run benchmarks without PGO and it was a loss of time: not building with PGO lead to random performances and so can easily lead to bad optimization decisions.

See my article: https://vstinner.github.io/journey-to-stable-benchmark-deadcode.html

I wrote a serie of articles:
https://vstinner.readthedocs.io/benchmark.html#my-articles

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