gcc/testsuite/gcc.dg/vect/no-scevccp-outer-20.c

   1 /* { dg-require-effective-target vect_int } */
   2
   3 #include <stdarg.h>
   4 #include "tree-vect.h"
   5
   6 #define N 40
   7
   8 int a[N];
   9 int b[N];
  10
  11 __attribute__ ((noinline)) int
  12 foo (){
  13   int i,j;
  14   int sum,x,y;
  15
  16   for (i = 0; i < N/2; i++) {
  17     sum = 0;
  18     x = b[2*i];
  19     y = b[2*i+1];
  20     for (j = 0; j < N; j++) {
  21       sum += j;
  22     }
  23     a[2*i] = sum + x;
  24     a[2*i+1] = sum + y;
  25   }
  26 }
  27
  28 int main (void)
  29 {
  30   int i,j;
  31   int sum;
  32
  33   check_vect ();
  34
  35   for (i=0; i<N; i++)
  36     b[i] = i;
  37
  38   foo ();
  39
  40     /* check results:  */
  41 #pragma GCC novector
  42   for (i=0; i<N/2; i++)
  43     {
  44       sum = 0;
  45       for (j = 0; j < N; j++)
  46         sum += j;
  47       if (a[2*i] != sum + b[2*i] || a[2*i+1] != sum + b[2*i+1])
  48         abort();
  49     }
  50
  51   return 0;
  52 }
  53
  54 /* { dg-final { scan-tree-dump-times "OUTER LOOP VECTORIZED." 1 "vect" { target vect_strided2 } } } */