[Bug middle-end/56344] ICE for program with very large structs returned by value

["rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56344

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-02-18
            Summary|ICE for program with larger |ICE for program with very
                   |automatic structs           |large structs returned by
                   |                            |value
     Ever Confirmed|0                           |1

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> 2013-02-18 11:09:32 UTC ---
Confirmed.  Returning a struct of size > 2^31 by value ICEs like the following:

t.c: In function 'main':
t.c:34:10: internal compiler error: Segmentation fault
   result = mulm(m1, m2);
          ^
0xad765d crash_signal
        /space/rguenther/src/svn/trunk/gcc/toplev.c:332
0x6d405b store_one_arg
        /space/rguenther/src/svn/trunk/gcc/calls.c:4707
0x6ceba4 expand_call(tree_node*, rtx_def*, int)
        /space/rguenther/src/svn/trunk/gcc/calls.c:3042
0x7f3634 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**)
        /space/rguenther/src/svn/trunk/gcc/expr.c:10207

Program received signal SIGSEGV, Segmentation fault.
0x000000000065b81f in store_one_arg (arg=0x7fffffffaf20, 
    argblock=0x7ffff5ac2560, flags=0, variable_size=0, reg_parm_stack_space=0)
    at /space/rguenther/src/svn/gcc-4_7-branch/gcc/calls.c:4675
4675          stack_usage_map[i] = 1;
(gdb) p i
$1 = -1990967296

my advice: don't do it ;) (it won't work at runtime anyway)

I think the middle-end should sorry (), the frontends eventually warn
(or reject if possible).