yolow64 0.2: a new decode kernel that beats Turbo-Base64 under full validation
yolow64 is the Base64 codec extracted from PageSift , published as 0.1 on Nov 9. Version 0.2 (plus a docs-only 0.2.1) is out, and the headline is decode.
Decode: new kernel
The bulk decoder was replaced with a four-block AVX2 hash loop using clean-room translation/validation tables, speculative validation, and per-quad constants held in registers. Full validation is retained for every block β nothing was traded away for speed. BMI2 pext tails handle padded 24- and 172-character inputs, and exact-length no-padding inputs of 16/32/64/128 characters bypass the general dispatch entirely.
The comparison that matters is against Turbo-Base64 built with FULLCHECK=1 . Turbo's default build checks only the first of four blocks in its hot loop; comparing against that would be comparing against 25% validation.β¦
