[Bug target/67619] New: ICE at -O1 and above on x86_64-linux-gnu in int_mode_for_mode, at stor-layout.c:425

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67619

            Bug ID: 67619
           Summary: ICE at -O1 and above on x86_64-linux-gnu in
                    int_mode_for_mode, at stor-layout.c:425
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

The following code causes an ICE when compiled with the current gcc trunk at
-O1 and above on x86_64-linux-gnu in both 32-bit and 64-bit modes.

It also affects 4.6.x through 5.2.x: 
(1) hang: 4.6.x and 4.7.x 
(2) ICE: 4.8.x to 5.2.x 


$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 6.0.0 20150917 (experimental) [trunk revision 227862] (GCC) 
$ 
$ gcc-trunk -O0 -c small.c
$ 
$ gcc-trunk -O1 -c small.c
small.c: In function ‘foo’:
small.c:9:3: internal compiler error: in int_mode_for_mode, at
stor-layout.c:425
   __builtin_eh_return (l, p);
   ^
0xa9f22b int_mode_for_mode(machine_mode)
        ../../gcc-trunk/gcc/stor-layout.c:425
0x7ec67e emit_move_via_integer
        ../../gcc-trunk/gcc/expr.c:3143
0x7f8d9a emit_move_insn_1(rtx_def*, rtx_def*)
        ../../gcc-trunk/gcc/expr.c:3524
0x7f90d4 emit_move_insn(rtx_def*, rtx_def*)
        ../../gcc-trunk/gcc/expr.c:3592
0x7dcae2 copy_to_reg(rtx_def*)
        ../../gcc-trunk/gcc/explow.c:578
0x7d558f expand_builtin_eh_return(tree_node*, tree_node*)
        ../../gcc-trunk/gcc/except.c:2222
0x6d48f4 expand_builtin(tree_node*, rtx_def*, rtx_def*, machine_mode, int)
        ../../gcc-trunk/gcc/builtins.c:6450
0x7f46d2 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
        ../../gcc-trunk/gcc/expr.c:10473
0x6f54a3 expand_expr
        ../../gcc-trunk/gcc/expr.h:255
0x6f54a3 expand_call_stmt
        ../../gcc-trunk/gcc/cfgexpand.c:2647
0x6f54a3 expand_gimple_stmt_1
        ../../gcc-trunk/gcc/cfgexpand.c:3534
0x6f54a3 expand_gimple_stmt
        ../../gcc-trunk/gcc/cfgexpand.c:3697
0x6f6b9a expand_gimple_basic_block
        ../../gcc-trunk/gcc/cfgexpand.c:5700
0x6fda46 execute
        ../../gcc-trunk/gcc/cfgexpand.c:6286
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
$ 


--------------------------------


void
foo ()
{
  unsigned long l;
  void *p = 0; 

  __builtin_unwind_init ();
  l = 0; 
  __builtin_eh_return (l, p);
}