This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: Bug in simplify_subreg?


Richard Henderson <rth@redhat.com> writes:
> On Fri, Aug 02, 2002 at 01:02:26PM +0200, Lars Brinkhoff wrote:
> > If I insert the same checks against final_regno as are made to
> > REGNO (op), everything seems to be fine.  Is this the right thing
> > to do?
> No.  If the frame pointer isn't being used, then gen_reg_RTX isn't
> supposed to return frame_pointer_rtx.

But it does.  Since outermode==SImode==Pmode and reload_in_progress==0,
gen_reg_RTX returns frame_pointer_rtx to simplify_subreg.  And so
ORIGINAL_REGNO of frame_pointer_rtx is clobbered.

Would the right solution be to check frame_pointer_needed in gen_reg_RTX?

-- 
Lars Brinkhoff          http://lars.nocrew.org/     Linux, GCC, PDP-10,
Brinkhoff Consulting    http://www.brinkhoff.se/    HTTP programming


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]