1  /* Test the attribute((optimize)) really works.  Do this test by checking
       2     whether we vectorize a simple loop.  */
       3  /* { dg-do compile } */
       4  /* { dg-options "-O1 -msse2 -mfpmath=sse -march=k8 --param min-insn-to-prefetch-ratio=0" } */
       5  /* { dg-final { scan-assembler "prefetcht0" } } */
       6  /* { dg-final { scan-assembler "addps" } } */
       7  /* { dg-final { scan-assembler "subss" } } */
       8  
       9  #define SIZE 10240
      10  float a[SIZE] __attribute__((__aligned__(32)));
      11  float b[SIZE] __attribute__((__aligned__(32)));
      12  float c[SIZE] __attribute__((__aligned__(32)));
      13  
      14  /* This should vectorize.  */
      15  void opt3 (void) __attribute__((__optimize__(3,"unroll-all-loops,-fprefetch-loop-arrays")));
      16  
      17  void
      18  opt3 (void)
      19  {
      20    int i;
      21  
      22    for (i = 0; i < SIZE; i++)
      23      a[i] = b[i] + c[i];
      24  }
      25  
      26  /* This should not vectorize.  */
      27  void
      28  not_opt3 (void)
      29  {
      30    int i;
      31  
      32    for (i = 0; i < SIZE; i++)
      33      a[i] = b[i] - c[i];
      34  }
      35