1  /* PR tree-optimization/39455 */
       2  /* { dg-do compile } */
       3  /* { dg-options "-O2 -fprefetch-loop-arrays -w" } */
       4  /* { dg-additional-options "-march=i686 -msse" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */
       5  
       6  void
       7  foo (char *x, unsigned long y, unsigned char *z)
       8  {
       9    unsigned int c[256], *d;
      10  
      11    for (d = c + 1; d < c + 256; ++d)
      12      *d += d[-1];
      13    x[--c[z[y]]] = 0;
      14  }