http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48846
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
AssignedTo|unassigned at gcc dot |rguenth at gcc dot gnu.org
|gnu.org |
--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-05-03
09:05:58 UTC ---
We have a field-decl with off_align == 255, thus DECL_OFFSET_ALIGN is
technically undefined (computed as 1u << 255). Things go downhill from there
in at gimplify.c:2051 where we call
/* Divide the offset by its alignment. */
offset = size_binop_loc (loc, EXACT_DIV_EXPR, offset, factor);
with offset and factor == 0 because inn int_const_binop we do
case ROUND_DIV_EXPR:
if (double_int_zero_p (op2))
return NULL_TREE;
and nothing checks for that result.
The bug is in the LTO streamer which packs DECL_OFFSET_ALIGN as a 8 bit
value, assumig it is decl_common.off_align which it is not.
Not sure why this is exposed by the build_int_cst patch.
Well, I have a patch anyway.
