[Bug tree-optimization/61385] New: ICE on valid code at -O2 and -O3 on x86_64-linux-gnu

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61385

            Bug ID: 61385
           Summary: ICE on valid code at -O2 and -O3 on x86_64-linux-gnu
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu

The following code causes an ICE when compiled with the current gcc trunk at
-O2 and -O3 on x86_64-linux-gnu in both 32-bit and 64-bit modes.

It is a regression from 4.9.x.


$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/4.10.0/lto-wrapper
Target: x86_64-unknown-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 4.10.0 20140601 (experimental) [trunk revision 211115] (GCC) 
$ 
$ gcc-trunk -Os small.c; a.out
$ gcc-4.9.0 -O2 small.c; a.out
$ 
$ gcc-trunk -O2 small.c
small.c: In function ‘fn1’:
small.c:6:1: internal compiler error: Segmentation fault
 fn1 ()
 ^
0x98642f crash_signal
    ../../gcc-trunk/gcc/toplev.c:337
0x7a0c09 is_gimple_val(tree_node*)
    ../../gcc-trunk/gcc/gimple-expr.c:814
0x9aa66d verify_gimple_assign_binary
    ../../gcc-trunk/gcc/tree-cfg.c:3582
0x9b5aff verify_gimple_in_cfg(function*, bool)
    ../../gcc-trunk/gcc/tree-cfg.c:4889
0x8cdc5e execute_function_todo
    ../../gcc-trunk/gcc/passes.c:1777
0x8ce4a3 execute_todo
    ../../gcc-trunk/gcc/passes.c:1834
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.
$ 


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


#include <assert.h>

int a, b, c, d, e, f, g;

int
fn1 ()
{
  int *h = &c;
  for (; c < 1; c++)
    {
      int *i = &a, *k = &a;
      f = 0;
      if (b)
    return 0;
      if (*h)
    {
      int **j = &i;
      *j = 0;
      d = 0;
    }
      else
    g = e = 0;
      if (*h)
    {
      int **l = &k;
      *l = &g;
    }
      d &= *h;
      assert (k == &a || k);
      assert (i);
    }
  return 0;
}

int
main ()
{
  fn1 (); 
  return 0;
}