1  /* { dg-options "-O3 -floop-nest-optimize" } */
       2  
       3  typedef unsigned char uint8_t;
       4  
       5  void border_mirror(uint8_t *outer_img, int w, int h, int rb, int border)
       6  {
       7    uint8_t *img = outer_img + border * rb + border;
       8    int x, y;
       9  
      10    for (y = -border; y < 0; y++) {
      11      for (x = -border; x < 0; x++)
      12        img[y*rb + x] = img[(-y)*rb + (-x)];
      13  
      14      for (x = 0; x < w; x++)
      15        img[y*rb + x] = img[(-y)*rb + x];
      16    }
      17  }
      18  
      19  void border_mirror_480(uint8_t *outer_img)
      20  {
      21    border_mirror(outer_img, 640, 480, 640 + 16*2, 16);
      22  }