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

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-optimized" } */
   3 int a, b, c, d;
   4 extern int printf (const char *, ...);
   5 int main(void)
   6 {
   7   int e;
   8   int f;
   9   /* We should be able to transform these into the same expression, and only have two additions.  */
  10   e = a + b;
  11   e = e + c;
  12   f = c + a;
  13   f = f + b;
  14   printf ("%d %d\n", e, f);
  15 }
  16
  17 /* { dg-final { scan-tree-dump-times "a \\\+ b" 1 "optimized"} } */
  18 /* { dg-final { cleanup-tree-dump "optimized" } } */