Our string builder class has a simple find_next_json_quotable_character function for 64-bit ARM and x64 processors. https://github.com/simdjson/simdjson/blob/af2a43610e7c3560a24ab4016b186260dee748b8/include/simdjson/generic/builder/json_string_builder-inl.h#L165 We should add support for POWER processors.