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/* { dg-do compile } */

/* { dg-options "-O2 -fdump-tree-vrp1-details" } */

static int blocksize = 4096;

int bar (int);

void foo (void)

{

  int toread;

  int bytes;

  static char eof_reached = 0;

  toread = blocksize;

  bytes = 1;

  while (toread != 0)

    {

      bytes = bar (toread);

      if (bytes <= 0)

        {

          if (bytes < 0)

            continue;

          break;

        }

      toread -= bytes;

    }

  if (bytes == 0)

    eof_reached = 1;

}

/* First, we should simplify the bits < 0 test within the loop.  */

/* { dg-final { scan-tree-dump-times "Simplified relational" 1 "vrp1" } } */

/* Second, we should thread the edge out of the loop via the break

   statement.  */

/* { dg-final { scan-tree-dump-times "Threaded jump" 1 "vrp1" } } */

/* Now if we were really good, we'd realize that the final bytes == 0

   test is totally useless.  That's not likely to happen anytime soon.  */

/* { dg-final { cleanup-tree-dump "vrp1" } } */