gcc/testsuite/gcc.dg/vect/vect-outer-4.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 coeff[M];
  10 float out[N];
  11
  12 /* Outer-loop vectorization.  */
  13
  14 __attribute__ ((noinline)) void
  15 foo (){
  16   int i,j;
  17   float diff;
  18
  19   for (i = 0; i < N; i++) {
  20     diff = 0;
  21     for (j = 0; j < M; j+=4) {
  22       diff += in[j+i]*coeff[j];
  23     }
  24     out[i]=diff;
  25   }
  26 }
  27
  28 int main (void)
  29 {
  30   check_vect ();
  31   int i, j;
  32   float diff;
  33
  34   for (i = 0; i < M; i++)
  35     coeff[i] = i;
  36   for (i = 0; i < N+M; i++)
  37     in[i] = i;
  38
  39   foo ();
  40
  41   for (i = 0; i < N; i++) {
  42     diff = 0;
  43     for (j = 0; j < M; j+=4) {
  44       diff += in[j+i]*coeff[j];
  45     }
  46     if (out[i] != diff)
  47       abort ();
  48   }
  49
  50   return 0;
  51 }
  52
  53 /* { dg-final { scan-tree-dump-times "OUTER LOOP VECTORIZED" 1 "vect" } } */
  54 /* { dg-final { scan-tree-dump-times "zero step in outer loop." 1 "vect" } } */