[Bug tree-optimization/49518] [4.6/4.7 Regression] ICE in vect_enhance_data_refs_alignment, at tree-vect-data-refs.c:1555

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49518

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011.06.24 08:07:13
                 CC|                            |jakub at gcc dot gnu.org
          Component|c                           |tree-optimization
   Target Milestone|---                         |4.6.1
            Summary|ICE in                      |[4.6/4.7 Regression] ICE in
                   |vect_enhance_data_refs_alig |vect_enhance_data_refs_alig
                   |nment, at                   |nment, at
                   |tree-vect-data-refs.c:1555  |tree-vect-data-refs.c:1555
     Ever Confirmed|0                           |1

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-06-24 
08:07:13 UTC ---
Simplified testcase:
int a, b;
struct S { unsigned int s, t, u; } c, d = { 0, 1, 0 };

void
test (unsigned char z)
{
  char e[] = {0, 0, 0, 0, 1};
  for (c.s = 1; c.s; c.s++)
    {
      b = e[c.s];
      if (a)
        break;
      b = z >= c.u;
      if (d.t)
        break;
    }
}

Started with http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=167184