gcc/testsuite/gfortran.dg/reassoc_3.f90

   1 ! { dg-do compile }
   2 ! { dg-options "-O -ffast-math -fdump-tree-original -fdump-tree-optimized" }
   3
   4 ! Verify we associate properly during folding
   5 ! Verify we propagate constants in the presence of PAREN_EXPR
   6
   7 function test(a)
   8   real b, c, d
   9   c = a
  10   d = 5
  11   b = (c + 5 - c)
  12   b = (c + d - c)
  13   test = a + b - 5
  14 end
  15
  16 ! { dg-final { scan-tree-dump "b = 5" "original" } }
  17 ! { dg-final { scan-tree-dump-times " = " 1 "optimized" } }