On December 4, 2024 5:16:50 AM PST, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: >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)... > Yeah. That was a sad story, which I unfortunately am not at liberty to share.
