07f0f6abfc
After encountering the NUL terminator, the word-at-a-time loop exits and we must hash the remaining bytes. Previously we calculated the terminator's position and re-loaded the remaining bytes from the input string. We already have all the data we need in a register, so let's just mask off the bytes we need and hash them immediately. The mask can be cheaply computed without knowing the terminator's position. We still need that position for the length calculation, but the CPU can now do that in parallel with other work, shortening the dependency chain. Ants Aasma and John Naylor Discussion: https://postgr.es/m/CANwKhkP7pCiW_5fAswLhs71-JKGEz1c1%2BPC0a_w1fwY4iGMqUA%40mail.gmail.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/.