1  /* PR target/44606 */
       2  /* { dg-do run } */
       3  /* { dg-options "-O2" } */
       4  /* { dg-skip-if "requires io" { freestanding } }  */
       5  
       6  #include <stdio.h>
       7  
       8  extern void abort (void);
       9  
      10   typedef struct _PixelPacket { 	unsigned char r, g, b; }
      11   PixelPacket;
      12  #define ARRAYLEN(X) (sizeof(X)/sizeof(X[0]))
      13  PixelPacket q[6];
      14  #define COLS (ARRAYLEN(q) - 1)
      15  PixelPacket p[2*COLS + 22];
      16  #define Minify(POS, WEIGHT) do {	\
      17  	total_r += (WEIGHT)*(p[POS].r);	\
      18  	total_g += (WEIGHT)*(p[POS].g);	\
      19  	total_b += (WEIGHT)*(p[POS].b);	\
      20  } while (0)
      21  unsigned long columns = COLS;
      22  int main(void)
      23  {
      24  	static const unsigned char answers[COLS] = { 31, 32, 34, 35, 36 };
      25  	unsigned long x;
      26  	for (x = 0; x < sizeof(p)/sizeof(p[0]); x++) {
      27  		p[x].b = (x + 34) | 1;
      28  	}
      29  	for (x = 0; x < columns; x++) {
      30  		double total_r = 0, total_g = 0, total_b = 0;
      31  		double saved_r = 0, saved_g = 0, saved_b = 0;
      32  		Minify(2*x +  0,  3.0);
      33  		Minify(2*x +  1,  7.0);
      34  		Minify(2*x +  2,  7.0);
      35  		saved_r = total_r;
      36  		saved_g = total_g;
      37  		Minify(2*x + 11, 15.0);
      38  		Minify(2*x + 12,  7.0);
      39  		Minify(2*x + 18,  7.0);
      40  		Minify(2*x + 19, 15.0);
      41  		Minify(2*x + 20, 15.0);
      42  		Minify(2*x + 21,  7.0);
      43  		q[x].r = (unsigned char)(total_r/128.0 + 0.5);
      44  		q[x].g = (unsigned char)(total_g/128.0 + 0.5);
      45  		q[x].b = (unsigned char)(total_b/128.0 + 0.5);
      46  		fprintf(stderr, "r:%f g:%f b:%f\n", saved_r, saved_g, saved_b);
      47  	}
      48  	for (x = 0; x < COLS; x++) {
      49  		if (answers[x] != q[x].b)
      50  			abort();
      51  	}
      52  	return 0;
      53  }