gcc/testsuite/gcc.dg/tree-ssa/reassoc-13.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -ffast-math -fdump-tree-reassoc1 -fdump-tree-optimized" } */
   3
   4 double foo(double a)
   5 {
   6   double tmp = 5.0;
   7   double tmp2 = a + tmp;
   8   tmp2 = tmp2 - a;
   9   return a + tmp2 - 5.0;
  10 }
  11
  12 /* { dg-final { scan-tree-dump-not "\\\+ 0.0" "reassoc1" } } */
  13 /* { dg-final { scan-tree-dump "return a;" "optimized" } } */
  14 /* { dg-final { cleanup-tree-dump "reassoc1" } } */
  15 /* { dg-final { cleanup-tree-dump "optimized" } } */