> That is: on 64-bit x86, you have with frame pointers twice as many available registers as 32-bit x86 has without frame pointers
Indeed.
> I don't think getting rid of frame pointer omission would be viable if Fedora still supported 32-bit x86
Fedora still supports it (e.g. packages are still built for i686, and you can install them on x86_64) though it has dropped 32-bit ARM. But the change to reenable frame pointers will not be applied to 32-bit x86 builds.
Indeed.
> I don't think getting rid of frame pointer omission would be viable if Fedora still supported 32-bit x86
Fedora still supports it (e.g. packages are still built for i686, and you can install them on x86_64) though it has dropped 32-bit ARM. But the change to reenable frame pointers will not be applied to 32-bit x86 builds.