gcc/testsuite/gcc.dg/tree-ssa/ssa-sccvn-1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-fre1-stats" } */
   3
   4 void vnum_test8(int *data)
   5 {
   6   int i;
   7   int stop = data[3];
   8   int m = data[4];
   9   int n = m;
  10   for (i=0; i<stop; i++) {
  11     int k = data[2];
  12     data[k] = 2;
  13     data[0] = m - n;
  14     k = data[1];
  15     m = m + k;
  16     n = n + k;
  17   }
  18 }
  19 /* We should eliminate m - n, and set n = n + k into n = m. */
  20 /* { dg-final { scan-tree-dump-times "Eliminated: 3" 1 "fre1"} } */
  21 /* { dg-final { cleanup-tree-dump "fre1" } } */