Re: building i386 world on amd64 host: failed @svn
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On Thu, Aug 15, 2013 at 09:12:52PM +0200, Dimitry Andric wrote:
> On Aug 15, 2013, at 20:36, Konstantin Belousov <kostikbel@gmail.com> wrot=
e:
> > Does the linux box defaults to pentium or higher for -march ?
> > 64 bit atomics cannot be implemented in usermode on i386 on
> > processors which do not have cmpxchg8b instruction.
>=20
> Ah yes, you are totally right, with -v it gives:
>=20
> COLLECT_GCC_OPTIONS=3D'-O2' '-S' '-v' '-mtune=3Dgeneric' '-march=3Di586'
>=20
> So we should really disable atomics for i486 and lower? Though I have
> understood that there also some pentiums without cmpxchg8b...
I do not think that there was any Pentium-branded CPU which did not
implemented cmpxchg8b. Some late 486 did provided cpuid, but I am
almost certain that they did not have cmpxchg8b (cannot check anyway).
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