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   for (i = 0; i < N; i++)
  31     if (a[i] != DIFF)
  32       abort ();
  33
  34   return 0;
  35 }
  36
  37 int main (void)
  38 {
  39   int i, j;
  40
  41   check_vect ();
  42
  43   for (i = 0; i < N; i++)
  44     for (j = 0; j < N; j++)
  45       {
  46         b[i][j] = i+j+5;
  47         c[i][j] = i+j;
  48       }
  49
  50   main1 ();
  51
  52   return 0;
  53 }
  54
  55 /* { dg-final { scan-tree-dump-times "OUTER LOOP VECTORIZED" 1 "vect" } } */