1  /* { dg-do run } */
       2  /* { dg-options "-O3 -save-temps" } */
       3  #include <stdint.h>
       4  #include <string.h>
       5  
       6  #pragma GCC target "+nosve"
       7  
       8  #define ARR_SIZE 1024
       9  
      10  /* Should produce an shll,shll2 pair*/
      11  void sshll_opt (int32_t *foo, int16_t *a, int16_t *b)
      12  {
      13      for( int i = 0; i < ARR_SIZE - 3;i=i+4)
      14      {
      15          foo[i]   = a[i]   << 16;
      16          foo[i+1] = a[i+1] << 16;
      17          foo[i+2] = a[i+2] << 16;
      18          foo[i+3] = a[i+3] << 16;
      19      }
      20  }
      21  
      22  __attribute__((optimize (0)))
      23  void sshll_nonopt (int32_t *foo, int16_t *a, int16_t *b)
      24  {
      25      for( int i = 0; i < ARR_SIZE - 3;i=i+4)
      26      {
      27          foo[i]   = a[i]   << 16;
      28          foo[i+1] = a[i+1] << 16;
      29          foo[i+2] = a[i+2] << 16;
      30          foo[i+3] = a[i+3] << 16;
      31      }
      32  }
      33  
      34  
      35  void __attribute__((optimize (0)))
      36  init(uint16_t *a, uint16_t *b)
      37  {
      38      for( int i = 0; i < ARR_SIZE;i++)
      39      {
      40        a[i] = i;
      41        b[i] = 2*i;
      42      }
      43  }
      44  
      45  int __attribute__((optimize (0)))
      46  main()
      47  {
      48      uint32_t foo_arr[ARR_SIZE];
      49      uint32_t bar_arr[ARR_SIZE];
      50      uint16_t a[ARR_SIZE];
      51      uint16_t b[ARR_SIZE];
      52  
      53      init(a, b);
      54      sshll_opt(foo_arr, a, b);
      55      sshll_nonopt(bar_arr, a, b);
      56      if (memcmp(foo_arr, bar_arr, ARR_SIZE) != 0)
      57        return 1;
      58      return 0;
      59  }
      60  
      61  /* { dg-final { scan-assembler-times {\tshll\t} 1} } */
      62  /* { dg-final { scan-assembler-times {\tshll2\t} 1} } */