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

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