Question regarding ICE in instantiate_virtual_regs_1, at function.c:3880

[John David Anglin]

> > > > I have come to the conclusion that there is a problem with
> > > > GO_IF_LEGITIMATE_ADDRESS on the vax (ie, it shouldn't accept a
> > > > DCmode MEM with the above indexing) since the maximum number
> > > > of bytes that can be moved in a single insn is 8.

Changing GO_IF_LEGITIMATE_ADDRESS to reject DCmode (or larger) index
addresses in the form plus ((mult ((reg) (const_int))) (mem)) appears
to resolve the problem.  Logically, this seems the correct approach as
the capability to index DCmode doesn't exist on all VAXen, and no DCmode
patterns are presently in the machine definition.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)