http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52979
--- Comment #6 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-04-24
11:57:53 UTC ---
But it uses TYPE_SIZE_UNIT to constrain it which is 5, and maxbitsize 40.
Which then leads to a representative of BLKmode via
if (mode == VOIDmode)
{
/* We really want a BLKmode representative only as a last resort,
considering the member b in
struct { int a : 7; int b : 17; int c; } __attribute__((packed));
Otherwise we simply want to split the representative up
allowing for overlaps within the bitfield region as required for
struct { int a : 7; int b : 7;
int c : 10; int d; } __attribute__((packed));
[0, 15] HImode for a and b, [8, 23] HImode for c. */
DECL_SIZE (repr) = bitsize_int (bitsize);
DECL_SIZE_UNIT (repr) = size_int (bitsize / BITS_PER_UNIT);
DECL_MODE (repr) = BLKmode;
TREE_TYPE (repr) = build_array_type_nelts (unsigned_char_type_node,
bitsize / BITS_PER_UNIT);
so - where does it go wrong then?
