[PATCH,AIX] go: disable mvsx and maltivec for aix/ppc

[Ian Lance Taylor]

On Mon, Apr 1, 2019 at 7:06 PM David Edelsohn <dje.gcc@gmail.com> wrote:
>
> On Mon, Apr 1, 2019 at 9:50 PM Ian Lance Taylor <iant@golang.org> wrote:
> >
> > On Mon, Apr 1, 2019 at 12:43 AM CHIGOT, CLEMENT <clement.chigot@atos.net> wrote:
> > >
> > > Description:
> > >   * This patch removes -mvsx and -maltivec for go aix/ppc.
> > >      These options don't seem compatible with Go stack layout.
> >
> > Can you give some more details on the problem?  gccgo should just be
> > using the regular stack layout, I can't think of any reason why these
> > options would not be compatible.
>
> Some Altivec instructions require stricter alignment and 32 bit AIX
> does not impose sufficient alignment in the stack, so GCC Go silently
> references the wrong address.
>
> GCC Go should be able to align the stack properly on AIX. In the
> interim, we need to disable generation of Altivec/VSX.

Thanks.  That makes it seem like more of a general GCC problem than a
gccgo problem, though.  Or does GCC arrange to align the stack in the
main function?

Ian