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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/49926] [4.7 Regression] ice in process_use, at tree-vect-stmts.c:405
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49926

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-07-31 22:51:30 UTC ---
Actually, that was over-simplified, that crashed just at r173856 and a few
hundred revisions afterwards, this fails even with current trunk at -O3:
int a, b, c[10];

void
foo (unsigned int x, int y, int z, int *w)
{
  do
    {
      *w = z;
      y = x;
      if (y)
        for (b = -4; b; b++)
          {
            z = y &= a &= 1;
            y &= c[b + 4];
          }
    }
  while (1);
}