Re: [PATCH 03/11] x86: Kconfig.cpu: split out 64-bit atom

[Thomas Gleixner]

On Wed, Dec 04 2024 at 11:30, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@xxxxxxxx>
>
> Both 32-bit and 64-bit builds allow optimizing using "-march=atom", but
> this is somewhat suboptimal, as gcc and clang use this option to refer
> to the original in-order "Bonnell" microarchitecture used in the early
> "Diamondville" and "Silverthorne" processors that were mostly 32-bit only.
>
> The later 22nm "Silvermont" architecture saw a significant redesign to
> an out-of-order architecture that is reflected in the -mtune=silvermont
> flag in the compilers, and all of these are 64-bit capable.

In theory. There are quite some crippled variants of silvermont which
are 32-bit only (either fused or at least officially not-supported to
run 64-bit)...