Re: [PATCH] ARM: makefile: pass -march=armv4 to assembler even on CPU32v3

[Jason A. Donenfeld]

Hi Ard,

On Tue, Oct 2, 2018 at 5:54 AM Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> wrote:
> So Arnd's suggestion to switch to armv3-m would actually be feasible
> then? The code in question does not use ldrh only umull, and so it
> should build with armv3m as well. And we will even generate some
> better code for RiscPC if we apply it to both the cflags and the
> asflags.

It turns out armv3m isn't a solution for the crypto code, since it
does other armv4-isms. So we'll need to find another solution for
that; I'm partial to my initial Kconfig one just doing "depends
!CPU_32V3".

With regards to RiscPC though, given that armv3 codegen might be
better, it sounds like it's a good idea to set -march=armv3m anyway
for the platform, irrespective of fixing the problem at hand here.

Regards,
Jason