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/* PR tree-optimization/21001

   VRP did not insert ASSERT_EXPRs when the variable tested in a

   COND_EXPR is a single-use variable.  By propagating the definition

   of the single-use variable into the COND_EXPR, we can get useful

   range infomation out of the conditional.  */

/* { dg-do compile } */

/* { dg-options "-O2 -fno-tree-dominator-opts -fdump-tree-vrp-details" } */

int

foo (int a)

{

  int b = a != 0;

  if (b)

    if (a != 0)

      return 1;

  return 0;

}

/* { dg-final { scan-tree-dump-times "Folding predicate" 1 "vrp"} } */

/* { dg-final { cleanup-tree-dump "vrp" } } */