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  #pragma GCC push_options
      16  #pragma GCC optimize (3, "unroll-all-loops", "-fprefetch-loop-arrays")
      17  
      18  void
      19  opt3 (void)
      20  {
      21    int i;
      22  
      23    for (i = 0; i < SIZE; i++)
      24      a[i] = b[i] + c[i];
      25  }
      26  
      27  #pragma GCC pop_options
      28  
      29  /* This should not vectorize.  */
      30  void
      31  not_opt3 (void)
      32  {
      33    int i;
      34  
      35    for (i = 0; i < SIZE; i++)
      36      a[i] = b[i] - c[i];
      37  }
      38