Intel optimizes slimmed-down X86S instruction set – revision 1.2

Intel has introduced version 1.2 of its X86S instruction set architecture (ISA), which focuses on a streamlined, 64-bit-only design. This revision eliminates 16-bit and 32-bit features, reflecting Intel's view that many of these capabilities have become outdated. While a "32-bit compatibility mode" has been added, its specific functionality remains unclear. The move to X86S raises concerns about legacy support, a hallmark of the x86 architecture, particularly as Windows has historically maintained compatibility with older software and hardware. The potential shift to X86S could disrupt this legacy support, which is crucial for many users. Additionally, the implications for AMD, Intel's main competitor in the x86 market, are significant, as AMD has played a vital role in the development of the current 64-bit architecture. The future of X86S will depend on collaboration with both AMD and Microsoft to ensure a smooth transition and maintain user support for legacy applications.

- Intel's X86S ISA version 1.2 eliminates 16-bit and 32-bit features.

- A "32-bit compatibility mode" has been introduced, but its purpose is unclear.

- The shift to X86S may compromise legacy support, a key feature of the x86 architecture.

- AMD's response to Intel's X86S plans could significantly impact the x86 market.

- Collaboration with Microsoft may be necessary for successful adoption of X86S.