gcc/testsuite/gcc.dg/pr44606.c

   1 /* PR target/44606 */
   2 /* { dg-do run } */
   3 /* { dg-options "-O2" } */
   4
   5 #include <stdio.h>
   6
   7 extern void abort (void);
   8
   9  typedef struct _PixelPacket {  unsigned char r, g, b; }
  10  PixelPacket;
  11 #define ARRAYLEN(X) (sizeof(X)/sizeof(X[0]))
  12 PixelPacket q[6];
  13 #define COLS (ARRAYLEN(q) - 1)
  14 PixelPacket p[2*COLS + 22];
  15 #define Minify(POS, WEIGHT) do {        \
  16         total_r += (WEIGHT)*(p[POS].r); \
  17         total_g += (WEIGHT)*(p[POS].g); \
  18         total_b += (WEIGHT)*(p[POS].b); \
  19 } while (0)
  20 unsigned long columns = COLS;
  21 int main(void)
  22 {
  23         static const unsigned char answers[COLS] = { 31, 32, 34, 35, 36 };
  24         unsigned long x;
  25         for (x = 0; x < sizeof(p)/sizeof(p[0]); x++) {
  26                 p[x].b = (x + 34) | 1;
  27         }
  28         for (x = 0; x < columns; x++) {
  29                 double total_r = 0, total_g = 0, total_b = 0;
  30                 double saved_r = 0, saved_g = 0, saved_b = 0;
  31                 Minify(2*x +  0,  3.0);
  32                 Minify(2*x +  1,  7.0);
  33                 Minify(2*x +  2,  7.0);
  34                 saved_r = total_r;
  35                 saved_g = total_g;
  36                 Minify(2*x + 11, 15.0);
  37                 Minify(2*x + 12,  7.0);
  38                 Minify(2*x + 18,  7.0);
  39                 Minify(2*x + 19, 15.0);
  40                 Minify(2*x + 20, 15.0);
  41                 Minify(2*x + 21,  7.0);
  42                 q[x].r = (unsigned char)(total_r/128.0 + 0.5);
  43                 q[x].g = (unsigned char)(total_g/128.0 + 0.5);
  44                 q[x].b = (unsigned char)(total_b/128.0 + 0.5);
  45                 fprintf(stderr, "r:%f g:%f b:%f\n", saved_r, saved_g, saved_b);
  46         }
  47         for (x = 0; x < COLS; x++) {
  48                 if (answers[x] != q[x].b)
  49                         abort();
  50         }
  51         return 0;
  52 }