gcc/testsuite/g++.dg/cpp0x/constexpr-inline-1.C

   1 // PR c++/53792 - [C++11] improving compiler-time constexpr evaluation
   2 //     Test case from comment #8.
   3 // { dg-do compile { target c++14 } }
   4 // { dg-additional-options "-O1 -fdump-tree-optimized" }
   5
   6 template <class T>
   7 void sink (T);
   8
   9 constexpr unsigned foo ()
  10 {
  11   unsigned  i = 1;
  12   while ((i << 1) > i)
  13     i = i << 1;
  14
  15   return i;
  16 }
  17
  18 template <unsigned N>
  19 struct S { };
  20
  21 void bar ()
  22 {
  23   sink (foo ());
  24   sink (S<foo ()>());
  25 }
  26
  27 // Verify that the call to the foo() constexpr function is inlined
  28 // regardless of whether or not it's invoked in a constant expression.
  29 // { dg-final { scan-tree-dump-not "= *foo *\\\(" "optimized" } }