[Bug other/43562] GCC ICE on optimize attribute

[jakub at gcc dot gnu dot org]

------- Comment #11 from jakub at gcc dot gnu dot org  2010-04-19 07:02 -------
This change broke building wine on x86-64.  Distilled testcase:
__attribute__ ((ms_abi)) fn2 (int, int);
struct S { int s; };
struct T { int t; struct S *u; };

void
foo (struct T *x, void *y)
{
  int a, b, c, d;
  fn1 (0, &a, &b, &c, &d);
  x->u[x->t].s = fn2 (fn3 (), a);
  fn1 (y, &a, &b, &c, &d);
}

__attribute__ ((ms_abi)) void
bar (int x)
{
}

void
baz (int x)
{
}

now ICEs at -O2 on x86_64-linux with:
wineice.i: In function 'foo':
wineice.i:12: internal compiler error: in insert_save, at caller-save.c:1171
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Apparently setup_save_areas
                  saved_reg->slot     
                    = assign_stack_local_1
                      (regno_save_mode[regno][1],
                       GET_MODE_SIZE (regno_save_mode[regno][1]), 0, true);
creates a slot where regno_save_mode[regno][1] for regno 4 is VOIDmode, and the
VOIDmode MEM which has MEM_ALIGN 0 then confuses everything.


-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|FIXED                       |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43562