gcc/testsuite/gcc.dg/vect/vect-outer-4d.c

   1 /* { dg-require-effective-target vect_float } */
   2
   3 #include <stdarg.h>
   4 #include "tree-vect.h"
   5
   6 #define N 40
   7 #define M 128
   8 float in[N+M];
   9 float out[N];
  10
  11 /* Outer-loop vectorization.  */
  12
  13 __attribute__ ((noinline)) void
  14 foo (){
  15   int i,j;
  16   float diff;
  17
  18   for (i = 0; i < N; i++) {
  19     diff = 0;
  20     for (j = 0; j < M; j+=4) {
  21       diff += in[j+i];
  22     }
  23     out[i]=diff;
  24   }
  25 }
  26
  27 int main (void)
  28 {
  29   check_vect ();
  30   int i, j;
  31   float diff;
  32
  33   for (i = 0; i < N; i++)
  34     in[i] = i;
  35
  36   foo ();
  37
  38   for (i = 0; i < N; i++) {
  39     diff = 0;
  40     for (j = 0; j < M; j+=4) {
  41       diff += in[j+i];
  42     }
  43     if (out[i] != diff)
  44       abort ();
  45   }
  46
  47   return 0;
  48 }
  49
  50 /* { dg-final { scan-tree-dump-times "OUTER LOOP VECTORIZED" 1 "vect"  } } */