[Bug tree-optimization/67915] New: ICE on valid code at -O2 and -O3 on x86_64-linux-gnu

["su at cs dot ucdavis.edu" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67915

            Bug ID: 67915
           Summary: ICE on valid code at -O2 and -O3 on x86_64-linux-gnu
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          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
-O2 and -O3 on x86_64-linux-gnu in both 32-bit and 64-bit modes.

It is a regression from 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 20151009 (experimental) [trunk revision 228653] (GCC) 
$ 
$ gcc-trunk -Os -c small.c
$ gcc-5.2 -O2 -c small.c
$ 
$ gcc-trunk -O2 -c small.c
small.c: In function âfn2â:
small.c:10:1: internal compiler error: Segmentation fault
 fn2 ()
 ^
0xaaee4f crash_signal
        ../../gcc-trunk/gcc/toplev.c:353
0x81c4c4 tree_unary_nonnegative_warnv_p(tree_code, tree_node*, tree_node*,
bool*, int)
        ../../gcc-trunk/gcc/fold-const.c:12822
0x82f0ef fold_binary_loc(unsigned int, tree_code, tree_node*, tree_node*,
tree_node*)
        ../../gcc-trunk/gcc/fold-const.c:11257
0xaf5067 cleanup_control_expr_graph
        ../../gcc-trunk/gcc/tree-cfgcleanup.c:116
0xaf5067 cleanup_control_flow_bb
        ../../gcc-trunk/gcc/tree-cfgcleanup.c:211
0xaf5067 cleanup_tree_cfg_bb
        ../../gcc-trunk/gcc/tree-cfgcleanup.c:628
0xaf56a8 cleanup_tree_cfg_1
        ../../gcc-trunk/gcc/tree-cfgcleanup.c:681
0xaf56a8 cleanup_tree_cfg_noloop
        ../../gcc-trunk/gcc/tree-cfgcleanup.c:733
0xaf56a8 cleanup_tree_cfg()
        ../../gcc-trunk/gcc/tree-cfgcleanup.c:788
0x9e9384 execute_function_todo
        ../../gcc-trunk/gcc/passes.c:1915
0x9e9c83 execute_todo
        ../../gcc-trunk/gcc/passes.c:2028
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.
$ 


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


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

int
fn1 (int p1)
{
  return p1;
}

void
fn2 ()
{
lbl:
  g = b;
  if (fn1 (c && e))
    {
      f = a ? 0 : 1 << 1;
      short h = b;
      d = h < 0 || f ? 0 : 1;
    }
  goto lbl;
}