PATCH [5/n]: Prepare x32: PR middle-end/48016: Inconsistency in non-local goto save area

Michael Matz matz@suse.de
Wed Jun 29 17:03:00 GMT 2011


Hi,

On Wed, 29 Jun 2011, H.J. Lu wrote:

> > diff --git a/gcc/function.c b/gcc/function.c
> > index 81c4d39..131bc09 100644
> > --- a/gcc/function.c
> > +++ b/gcc/function.c
> > @@ -4780,7 +4780,7 @@ expand_function_start (tree subr)
> >                       cfun->nonlocal_goto_save_area,
> >                       integer_zero_node, NULL_TREE, NULL_TREE);
> >       r_save = expand_expr (t_save, NULL_RTX, VOIDmode, EXPAND_WRITE);
> > -      r_save = convert_memory_address (Pmode, r_save);
> > +      r_save = adjust_address (r_save, Pmode, 0);

This is actually the same problem as in explow.c.  t_save is built with 
ptr_type_node, where it should have been using
  TREE_TYPE (TREE_TYPE (cfun->nonlocal_goto_save_area))

Then r_save should have the correct mode already, possibly this could be 
asserted.  You are right that r_save needs to correspond to the 
nonlocal_goto_save_area[0] array-ref, hence pseudos aren't okay, therefore 
convert_memory_address isn't.  Actually I think we might even want to 
assert that indeed the expanded r_save is of Pmode already.


Ciao,
Michael.


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