On Tue, Oct 18, 2022 at 9:37 AM David Seifert <s...@gentoo.org> wrote: > > On Tue, 2022-10-18 at 13:40 +0200, Ulrich Mueller wrote: > > > > > > > On Tue, 18 Oct 2022, David Seifert wrote: > > > > > > > -CFLAGS_x86="-m32" > > > > > +CFLAGS_x86="-m32 -mfpmath=sse" > > > > > -mfpmath=sse is already the default on amd64. > > > > I see. This change makes sense then. > > > > What about profiles/arch/x86 though? IIUC we'll end up with an > > inconsistency between x86 and multilib amd64. > > > > Ulrich > > What if I want to build Gentoo on an old AMD Thunderbird which has > neither SSE1 nor the more important SSE2?
Right. On amd64 CPU always supports SSE2, so -mfpmath=sse will always work there. On x86, we need to consider a more diverse set of supported instructions.
