gcc/testsuite/gcc.dg/tree-ssa/ssa-sccvn-2.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-fre-stats" } */
   3
   4 int vnum_test8(int *data)
   5 {
   6   int i;
   7   int stop = data[3];
   8   int m = data[4];
   9   int n = m;
  10   int p;
  11   for (i=0; i<stop; i++) {
  12     int k = data[2];
  13     data[k] = 2;
  14     data[0] = m - n;
  15     k = data[1];
  16     m = m + k;
  17     n = n + k;
  18     p = data[0];
  19   }
  20   return p;
  21 }
  22 /* We should eliminate m - n, and set n = n + k into n = m, and
  23    set p to 0 */
  24 /* { dg-final { scan-tree-dump-times "Eliminated: 3" 1 "fre"} } */
  25 /* { dg-final { cleanup-tree-dump "fre" } } */