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Unlike TRY_POPCNT_FAST, which is defined in pg_bitutils.h, this macro is defined in c.h (via pg_config.h), so we can check for it earlier and avoid some unnecessary #includes on systems that lack AVX-512 support. Oversight in commit f78667bd91. Discussion: https://postgr.es/m/Zy5K5Qmlb3Z4dsd4%40nathan
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/.