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/* PR rtl-optimization/51924 */

/* Testcase by Zdenek Sojka <zsojka@seznam.cz> */

/* { dg-do run } */

/* { dg-options "-O -free -fno-rename-registers -ftree-vectorize -funroll-loops" } */

typedef __UINT64_TYPE__ uint64_t;

uint64_t __attribute__ ((noinline, noclone))

bn_sub_words (uint64_t * r, const uint64_t * a, const uint64_t * b, int n)

{

  uint64_t t1, t2;

  unsigned c = 0;

  while (n)

    {

      t1 = a[0];

      t2 = b[0];

      r[0] = (t1 - t2 - c);

      if (t1 != t2)

        c = (t1 < t2);

      a++;

      b++;

      r++;

      n--;

    }

  return (c);

}

int

main (void)

{

  uint64_t r[2];

  uint64_t a[2] = { -1, -1 };

  uint64_t b[2] = { 0, 0 };

  if (bn_sub_words (r, a, b, 2) != 0)

    __builtin_abort ();

  return 0;

}