gcc/testsuite/gcc.dg/vect/vect-nest-cycle-3.c

   1 /* { dg-require-effective-target vect_float } */
   2
   3 #include <stdarg.h>
   4 #include "tree-vect.h"
   5
   6 #define N 16
   7 #define DIFF 82
   8
   9 float c[N][N], b[N][N], a[N];
  10
  11 __attribute__ ((noinline)) int
  12 main1 ()
  13 {
  14   int i, j;
  15   float diff;
  16
  17   /* In inner loop vectorization -funsafe-math-optimizations is needed to
  18      vectorize the summation. But in outer loop vectorization the order of
  19      calculation doesn't change, therefore, there is no need in that flag.  */
  20   for (i = 0; i < N; i++)
  21     {
  22       diff = 2;
  23       for (j = 0; j < N; j++)
  24         diff += (b[j][i] - c[j][i]);
  25
  26       a[i] = diff;
  27     }
  28
  29   /* Check results:  */
  30 #pragma GCC novector
  31   for (i = 0; i < N; i++)
  32     if (a[i] != DIFF)
  33       abort ();
  34
  35   return 0;
  36 }
  37
  38 int main (void)
  39 {
  40   int i, j;
  41
  42   check_vect ();
  43
  44   for (i = 0; i < N; i++)
  45     for (j = 0; j < N; j++)
  46       {
  47         b[i][j] = i+j+5;
  48         c[i][j] = i+j;
  49       }
  50
  51   main1 ();
  52
  53   return 0;
  54 }
  55
  56 /* { dg-final { scan-tree-dump-times "OUTER LOOP VECTORIZED" 1 "vect" } } */