1  /* PR rtl-optimization/51924 */
       2  /* Testcase by Zdenek Sojka <zsojka@seznam.cz> */
       3  
       4  /* { dg-do run } */
       5  /* { dg-options "-O -free -fno-rename-registers -ftree-vectorize -funroll-loops" } */
       6  
       7  typedef __UINT64_TYPE__ uint64_t;
       8  
       9  uint64_t __attribute__ ((noinline, noclone))
      10  bn_sub_words (uint64_t * r, const uint64_t * a, const uint64_t * b, int n)
      11  {
      12    uint64_t t1, t2;
      13    unsigned c = 0;
      14  
      15    while (n)
      16      {
      17        t1 = a[0];
      18        t2 = b[0];
      19        r[0] = (t1 - t2 - c);
      20        if (t1 != t2)
      21  	c = (t1 < t2);
      22        a++;
      23        b++;
      24        r++;
      25        n--;
      26      }
      27    return (c);
      28  }
      29  
      30  int
      31  main (void)
      32  {
      33    uint64_t r[2];
      34    uint64_t a[2] = { -1, -1 };
      35    uint64_t b[2] = { 0, 0 };
      36    if (bn_sub_words (r, a, b, 2) != 0)
      37      __builtin_abort ();
      38    return 0;
      39  }