songgaoye opened a new pull request, #3684:
URL: https://github.com/apache/brpc/pull/3684
### What problem does this PR solve?
Issue Number: resolve
Problem Summary:
Base64 encoding and decoding use scalar implementations on x86 even when
AVX2 is available, limiting throughput for medium and large payloads.
What is changed and the side effects?
Changed:
- Add an AVX2 Base64 codec derived from aklomp/base64, with BSD-2-Clause
attribution.
- Dispatch to AVX2 only on supported x86 CPUs.
- Use measured thresholds to retain the scalar path for small inputs:
- Encode: AVX2 from 32 bytes.
- Decode: AVX2 from 256 bytes of Base64 text.
- Add unit and fuzz coverage for binary round trips and invalid input.
- Add reproducible scalar and AVX2 benchmark targets via
BUILD_BASE64_BENCHMARKS.
Side effects:
- Performance effects:
- On an Intel i7-10700, AVX2 improves encode throughput by roughly 5–12x
and decode throughput by roughly 1.4–4.7x for sufficiently large inputs.
- Small payloads continue to use the scalar path.
- Breaking backward compatibility:
---
### Check List:
- Please make sure your changes are compilable.
- When providing us with a new feature, it is best to add related tests.
- Please follow [Contributor Covenant Code of
Conduct](https://github.com/apache/brpc/blob/master/CODE_OF_CONDUCT.md).
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