gh-124951: Optimize base64 encode & decode for an easy 2-3x speedup [no SIMD] - #143262

Merged

gpshead merged 13 commits into

python:mainfrom

gpshead:opt-base64-cpu

Jan 2, 2026

Commits on Dec 29, 2025

Add base64 benchmark tool and optimize encoding/decoding

gpshead
and
claude
committed
2d2be30
Fix MSVC build: move table_b2a_base64 before inline functions

gpshead
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claude
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573eaf3
NEWS entry
gpshead
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eaac671
Add a whatsnew entry
gpshead
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060dbf5
expose the benchmark defaults in the help text.

gpshead
and
picnixz
authored
1e12273
Align base64 tables to 64-byte cache line boundaries

gpshead
and
claude
committed
ef38895
Use BASE64_PAD macro instead of literal '=' in fast path

gpshead
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claude
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7458c99
Simplify block comment for base64 helpers

gpshead
and
claude
committed
1f8ff74
Remove binasciibench in favor of pyperformance bm_base64 addition PR.
gpshead
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4b1245b

Commits on Jan 2, 2026

reword L1 cache line comment
gpshead
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4b50c73
doc Contributed by
gpshead
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f7b27ee
Remove redundant PAD check in base64 decode fast path

gpshead
and
claude
committed
2b13b81
Use pointer increment in base64_encode_fast

gpshead
and
claude
committed
30976a9