f8f4afe751
Presently, the SIMD implementation of this function uses unsigned saturating subtraction to find bytes less than or equal to the given value, which is a workaround for the lack of unsigned comparison instructions on some architectures. However, Neon offers vminvq_u8(), which returns the minimum (unsigned) value in the vector. This commit adds a Neon-specific implementation that uses vminvq_u8() to optimize vector8_has_le() on AArch64. In passing, adjust the SSE2 implementation to use vector8_min() and vector8_eq() to find values less than or equal to the given value. This was the only use of vector8_ssub(), so it has been removed. Reviewed-by: John Naylor <johncnaylorls@gmail.com> Discussion: https://postgr.es/m/aNHDNDSHleq0ogC_%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/.