gcc/testsuite/gcc.dg/vect/vect-107.c

   1 /* { dg-require-effective-target vect_float } */
   2
   3 #include <stdarg.h>
   4 #include "tree-vect.h"
   5
   6 #define N 16
   7
   8 float b[N] = {0,3,6,9,12,15,18,21,24,27,30,33,36,39,42,45};
   9 float c[N] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
  10 float d[N] = {0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30};
  11
  12 __attribute__ ((noinline)) int
  13 main1 (void)
  14 {
  15   int i;
  16   float a[N];
  17
  18   /* Strided access. Vectorizable on platforms that support load of strided
  19      accesses (extract of even/odd vector elements).  */
  20   for (i = 0; i < N/2; i++)
  21     {
  22       a[i] = b[2*i+1] * c[2*i+1] - b[2*i] * c[2*i];
  23       d[i] = b[2*i] * c[2*i+1] + b[2*i+1] * c[2*i];
  24     }
  25
  26   /* Check results.  */
  27   for (i = 0; i < N/2; i++)
  28     {
  29       if (a[i] != b[2*i+1] * c[2*i+1] - b[2*i] * c[2*i]
  30           || d[i] != b[2*i] * c[2*i+1] + b[2*i+1] * c[2*i])
  31         abort();
  32     }
  33
  34   return 0;
  35 }
  36
  37 int main (void)
  38 {
  39   check_vect ();
  40   return main1 ();
  41 }
  42
  43 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_strided2 } } } */
  44 /* { dg-final { scan-tree-dump-times "vectorized 0 loops" 1 "vect" { xfail vect_strided2 } } } */