gcc/testsuite/gcc.dg/vect/pr82108.c

   1 /* { dg-require-effective-target vect_float } */
   2
   3 #include "tree-vect.h"
   4
   5 void __attribute__((noinline,noclone))
   6 downscale_2 (const float* src, int src_n, float* dst)
   7 {
   8   int i;
   9
  10   for (i = 0; i < src_n; i += 2) {
  11       const float* a = src;
  12       const float* b = src + 4;
  13
  14       dst[0] = (a[0] + b[0]) / 2;
  15       dst[1] = (a[1] + b[1]) / 2;
  16       dst[2] = (a[2] + b[2]) / 2;
  17       dst[3] = (a[3] + b[3]) / 2;
  18
  19       src += 2 * 4;
  20       dst +=     4;
  21   }
  22 }
  23
  24 int main ()
  25 {
  26   const float in[4 * 4] = {
  27       1, 2, 3, 4,
  28       5, 6, 7, 8,
  29
  30       1, 2, 3, 4,
  31       5, 6, 7, 8
  32   };
  33   float out[2 * 4];
  34
  35   check_vect ();
  36
  37   downscale_2 (in, 4, out);
  38
  39   if (out[0] != 3 || out[1] != 4 || out[2] != 5 || out[3] != 6
  40       || out[4] != 3 || out[5] != 4 || out[6] != 5 || out[7] != 6)
  41     __builtin_abort ();
  42
  43   return 0;
  44 }
  45
  46 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" } } */