Re: [tree-ssa] New g++/libstdc++ regressions with checking disabled.

[Jan Hubicka <jh@suse.cz>]

> On Tue, 2003-12-09 at 17:16, Jan Hubicka wrote:
> > > 
> > > Incidentally, please do not commit any patches that do not fix these
> > > regressions.
> > 
> > I've been looking into it with Jason and it seems to be that culprint is
> > misscopmilation in cp/class.o (at least replacing it by unoptimized
> > version makes the bug to go away).
> > The symptom is that method table contains bogus duplicated overload
> > entries, so it seems to be somewhere in add_method.
> > 
> Thanks.
> 
> I have reverted the patch that introduced these regressions.  The branch
> is open again.

OK.
I was trying to compare the compilations of that file with and without a
patch but the differences are too long for my tired mind today.  (the
code looks ineed a lot better with the patch)  I will try again tomorrow
unless Richard will beat me :)

Honza
> 
> 
> Diego.
> 
> 
>         * c-common.c (c_address_looks_like_offsetof): New.
>         * c-common.h (c_address_looks_like_offsetof): Declare.
>         * c-typeck.c (build_unary_op) <ADDR_EXPR>: Use it.  Don't lower
>         address references not destined for offsetof.
>         (c_expand_return): Only look inside ARRAY_REF and COMPONENT_REF
>         when looking for returning address of local variable.
>         * expr.c (expand_expr_1): Don't dereference size of unbounded arrays.
>         * gimplify.c (gimplify_addr_expr): Only fold address of variable size
>         array elements.
>         * tree-simple.c (is_gimple_min_invariant): Also check
>         is_gimple_variable before disallowing offset address for type.
>         * tree-ssa-ccp.c (maybe_fold_offset_to_aggregate_ref): New.
>         (maybe_fold_offset_to_component_ref): Use it.
>         (maybe_fold_stmt_indirect, maybe_fold_stmt_plus): Likewise.
>         (maybe_fold_offset_to_array_ref): Likewise.  Don't fail for division
>         remainder non-zero.
>         * varasm.c (initializer_constant_valid_p) <ADDR_EXPR>: Use
>         handled_component_p and look inside references.
>         <MINUS_EXPR>: Always look past widening casts.
>