7644a7340c
This commit improves the performance of pg_lfind32() in many cases by modifying it to process the remaining "tail" of elements with SIMD instructions instead of processing them one-by-one. Since the SIMD code processes a large block of elements, this means that we will process a subset of elements more than once, but that won't affect the correctness of the result, and testing has shown that this helps more cases than it regresses. With this change, the standard one-by-one linear search code is only used for small arrays and for platforms without SIMD support. Suggested-by: John Naylor Reviewed-by: John Naylor Discussion: https://postgr.es/m/20231129171526.GA857928%40nathanxps13
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/.