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Given an already-initialized hash state and a NUL-terminated string, accumulate the hash of the string into the hash state and return the length for the caller to (optionally) save for the finalizer. This avoids a strlen call. If the string pointer is aligned, we can use a word-at-a-time algorithm for NUL lookahead. The aligned case is only used on 64-bit platforms, since it's not worth the extra complexity for 32-bit. Handling the tail of the string after finishing the word-wise loop was inspired by NetBSD's strlen(), but no code was taken since that is written in assembly language. As demonstration, use this in the search path cache. This brings the general case performance closer to the special case optimization done in commit a86c61c9ee. There are other places that could benefit, but that is left for future work. Jeff Davis and John Naylor Reviewed by Heikki Linnakangas, Jian He, Junwang Zhao Discussion: https://postgr.es/m/3820f030fd008ff14134b3e9ce5cc6dd623ed479.camel%40j-davis.com Discussion: https://postgr.es/m/b40292c99e623defe5eadedab1d438cf51a4107c.camel%40j-davis.com
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. Copyright and license information can be found in the file COPYRIGHT. General documentation about this version of PostgreSQL can be found at: https://www.postgresql.org/docs/devel/ In particular, information about building PostgreSQL from the source code can be found at: https://www.postgresql.org/docs/devel/installation.html The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.