http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51990
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2012-01-25
Ever Confirmed|0 |1
--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-25
10:39:12 UTC ---
(In reply to comment #1)
> tentative fix:
>
> Index: gcc/tree-ssa-sccvn.c
> ===================================================================
> --- gcc/tree-ssa-sccvn.c (revision 183325)
> +++ gcc/tree-ssa-sccvn.c (working copy)
> @@ -624,6 +624,10 @@ copy_reference_ops_from_ref (tree ref, V
>
> switch (temp.opcode)
> {
> + case WITH_SIZE_EXPR:
> + temp.op0 = TREE_OPERAND (ref, 1);
> + temp.off = 0;
> + break;
> case MEM_REF:
> /* The base address gets its own vn_reference_op_s structure. */
> temp.op0 = TREE_OPERAND (ref, 1);
> @@ -740,6 +744,7 @@ copy_reference_ops_from_ref (tree ref, V
> VEC_safe_push (vn_reference_op_s, heap, *result, &temp);
>
> if (REFERENCE_CLASS_P (ref)
> + || TREE_CODE (ref) == WITH_SIZE_EXPR
> || (TREE_CODE (ref) == ADDR_EXPR
> && !is_gimple_min_invariant (ref)))
> ref = TREE_OPERAND (ref, 0);
I think there are a lot of bugs lurking in the compiler with respect to
not handling WITH_SIZE_EXPR (which incidentially isn't a handled-component,
nor tcc_reference ...). You btw. also need to handle re-materializing
them in create_component_ref_by_pieces_1.
