[pull] main from python:main #880
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…no SIMD] (GH-143262) Optimize base64 encoding/decoding by eliminating loop-carried dependencies. Key changes: - Add `base64_encode_trio()` and `base64_decode_quad()` helper functions that process complete groups independently - Add `base64_encode_fast()` and `base64_decode_fast()` wrappers - Update `b2a_base64` and `a2b_base64` to use fast path for complete groups Performance gains (encode/decode speedup vs main, PGO builds): ``` 64 bytes 64K 1M Zen2: 1.2x/1.8x 1.7x/2.8x 1.5x/2.8x Zen4: 1.2x/1.7x 1.6x/3.0x 1.5x/3.0x [old data, likely faster] M4: 1.3x/1.9x 2.3x/2.8x 2.4x/2.9x [old data, likely faster] RPi5-32: 1.2x/1.2x 2.4x/2.4x 2.0x/2.1x ``` Based on my exploratory work done in main...gpshead:cpython:claude/vectorize-base64-c-S7Hku See PR and issue for further thoughts on sometimes MUCH faster SIMD vectorized versions of this.
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