gcc/testsuite/gfortran.dg/reassoc_2.f90

   1 ! { dg-do compile }
   2 ! { dg-options "-O3 -ffast-math -fdump-tree-optimized" }
   3
   4 ! Make sure that FRE does not replace c with b in d = c - 5
   5
   6 function test(a)
   7   real a, b, c, d
   8   b = a + 5.
   9   c = (a + 5.)
  10   d = c - 5.
  11   call foo(b)
  12   test = d
  13 end
  14
  15 ! { dg-final { scan-tree-dump "- 5" "optimized" } }