gcc/testsuite/gcc.dg/vect/vect-outer-3c.c

   1 /* { dg-require-effective-target vect_float } */
   2 #include <stdarg.h>
   3 #include "tree-vect.h"
   4
   5 #define N 40
   6 float image[N][N+1] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
   7 float out[N];
   8
   9 /* Outer-loop vectorization.  */
  10
  11 __attribute__ ((noinline)) void
  12 foo (){
  13   int i,j;
  14   float diff;
  15
  16   for (i = 0; i < N; i++) {
  17     diff = 0;
  18     for (j = 0; j < N; j+=4) {
  19       diff += image[j][i];
  20     }
  21     out[i]=diff;
  22   }
  23 }
  24
  25 int main (void)
  26 {
  27   check_vect ();
  28   int i, j;
  29   float diff;
  30
  31   for (i = 0; i < N; i++) {
  32     for (j = 0; j < N; j++) {
  33       image[i][j]=i+j;
  34     }
  35   }
  36
  37   foo ();
  38
  39 #pragma GCC novector
  40   for (i = 0; i < N; i++) {
  41     diff = 0;
  42     for (j = 0; j < N; j+=4) {
  43       diff += image[j][i];
  44     }
  45     if (out[i] != diff)
  46       abort ();
  47   }
  48
  49   return 0;
  50 }
  51
  52 /* { dg-final { scan-tree-dump-times "OUTER LOOP VECTORIZED" 1 "vect" } } */