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issues: Mention the need for SSE2 for i386

Simon McVittie requested to merge smcv/release-notes:bug1105027 into master

  • issues: Mention the need for SSE2 for i386

    In trixie this is actually only required for code compiled by LLVM, such as Rust code (most C and C++ executables compiled by gcc still use the same baseline as in bookworm), but key packages like apt have this requirement (via sqv), and the message is clearer if we slightly over-state the requirement.

    Pentium III and Athlon XP are the most prominent examples of x86 CPUs that lack SSE2 and therefore could run bookworm but not trixie. The last few 32-bit Intel CPU families before the transition to 64-bit (Pentium IV, Pentium M, Core Solo/Duo) have SSE2 and therefore could technically run trixie userspace on a bookworm or locally-built kernel, but this is officially unsupported.

    MMX and SSE are also part of the effective baseline now, but as far as I know there has never been a CPU that supported SSE2 but not MMX and SSE, so it's enough to say that SSE2 is required.

    Closes: #1105027

Edited by Simon McVittie

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