On Thu, Jun 09, 2016 at 02:18:44PM +0200, Christophe Lyon wrote:
> On 8 June 2016 at 16:50, Jakub Jelinek <ja...@redhat.com> wrote:
> > On Wed, Jun 08, 2016 at 04:44:00PM +0200, Christophe Lyon wrote:
> >> I've tried the attached patch (which does only dg-options ->
> >> dg-additional-options).
> >> For GCC, it's better, except that on arm-none-eabi qemu complains about
> >> an illegal instruction when asked to use arm926 and GCC is configured with
> >> the default cpu. Maybe that's because check_vect does not have the expected
> >
> > check_vect installs a SIGILL handler and if the insn is invalid, excepts
> > a signal to be raised. Is that not the case with qemu? Or is qemu just
> > being too noisy?
> >
> qemu complains when executing check_vect's prologue, which contains
> movw r1, #35712
> which is not supported either on arm926.
Bet it depends if this happens before the signal(SIGILL, sig_ill_handler);
call or after it. If before, then I guess you'd better rewrite the
long long a = 0, b = 1;
asm ("vorr %P0, %P1, %P2"
: "=w" (a)
: "0" (a), "w" (b));
if (a != 1)
fully into inline asm, if after, then it is likely either just too noisy
qemu, or misdesigned issue in qemu.
Jakub
