Re: tree-ssa branch broken

[Graham Stott <graham dot stott at btinternet dot com>]

Graham Stott wrote:
> Diego Novillo wrote:
>
> > On Sat, 29 Jun 2002, Graham Stott wrote:
> >
> >
> > > I get the same segv compiling crtstuff.c with the stage2 compiler just
> > > built by stage1 and that is with and without rtl checking enabled.
> > It's possible that I'm not getting a segv because of the older
> > binutils I'm running.  I still have not had time to look into it
> > any more than this.
> >
> >
> > Diego.
> I've pinned it down to insn-recog.c:recog_30() being miscompiled, some
> more digging should be able to pinpoint it further.
>
> Graham
A bit more digging shows that the stack has been trashed on return
from recog_30, hence the segv.

The stack appears to get trashed in recog_22 called from recog_30
and looks to occur when setting "operand[0] = x2" part way thru
recog_22.

On entry to recog_22 a stack backtrace in gdb looks fine but after
the assignment to operand[0] the third entry in the backtrace is junk.

Cheers
Graham