[Bug tree-optimization/61529] New: ICE on valid code at -O3 on x86_64-linux-gnu in check_probability, at basic-block.h:953

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61529

            Bug ID: 61529
           Summary: ICE on valid code at -O3 on x86_64-linux-gnu in
                    check_probability, at basic-block.h:953
           Product: gcc
           Version: 4.10.0
            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
-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 20140616 (experimental) [trunk revision 211707] (GCC) 
$ 
$ gcc-trunk -O2 small.c; a.out
$ gcc-4.9 -O3 small.c; a.out
$ 
$ gcc-trunk -O3 small.c
small.c: In function ‘fn1’:
small.c:4:1: internal compiler error: in check_probability, at
basic-block.h:953
 fn1 ()
 ^
0xb905e6 check_probability
    ../../gcc-trunk/gcc/basic-block.h:953
0xb8dde1 check_probability
    ../../gcc-trunk/gcc/tree-vect-loop-manip.c:653
0xb8dde1 combine_probabilities
    ../../gcc-trunk/gcc/basic-block.h:962
0xb8dde1 slpeel_tree_peel_loop_to_edge
    ../../gcc-trunk/gcc/tree-vect-loop-manip.c:1371
0xb8e154 vect_do_peeling_for_loop_bound(_loop_vec_info*, tree_node*,
tree_node*, unsigned int, bool)
    ../../gcc-trunk/gcc/tree-vect-loop-manip.c:1761
0xb7f3a7 vect_transform_loop(_loop_vec_info*)
    ../../gcc-trunk/gcc/tree-vect-loop.c:5852
0xb9c286 vectorize_loops()
    ../../gcc-trunk/gcc/tree-vectorizer.c:476
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.
$ 


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


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

void
fn1 ()
{
  char h = 0;
lbl:
  for (c = 0; c; c = 0)
    for (; a;)
      for (d = 1; d; d++)
    if ((b & ((g > 0) >= h)) ^ 2)
      goto lbl;
  for (f = 1; f; f++)
    e ^= 1;
}

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