Topic summary
Advanced Performance Extensions
Extracted from the Wikipedia article X86.
APX
The Advanced Performance Extensions (APX) are extensions to double the number of general-purpose registers from 16 to 32 and add new features to improve general-purpose performance. These extensions have been called "generational" and "the biggest x86 addition since 64 bits". Intel contributed APX support to GNU Compiler Collection (GCC) 14. Also Microsoft Visual Studio 2026 added APX support. As of June 2025 the first generation of chips to support APX is slated to be Diamond Rapids.