[Bug tree-optimization/46507] std::tuple missed optimization
redi at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Tue Nov 16 19:53:00 GMT 2010
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46507
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2010-11-16 19:27:48 UTC ---
Paolo, your example *does* show a significant difference: the missed
optimisation is in std::get() and not tuple itself, as shown by
#include <tuple>
#include <utility>
struct A
{
virtual void f () const;
};
void arg_tuple_test (const std::pair<A,A> &t)
{
std::get<0>(t).f ();
}
void arg_pair_test (const std::pair<A,A> &t)
{
t.first.f ();
}
The second function jumps directly to A::f
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