8:57:29jdzstassats: I recently came across an article about accelerating Base64 encoding (and decoding in linked material): https://richardstartin.github.io/posts/base64-encoding. I have no practical experience with SIMD but my understanding from looking at OpenJDK sources is that it does input checking while decoding Base64 (around here:
8:57:29jdzhttps://github.com/openjdk/jdk/blob/0b34fc911921620a7931355aeda2cbdc3a31ead5/src/hotspot/cpu/x86/stubGenerator_x86_64.cpp#L2240). Maybe this helps with what you're doing.