[Bug c++/93666] Dependence of optimization on use of constexpr seems inappropriate

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93666

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The source:
struct A
{
    int i{1}, j{2};
    A(int i_, int j_) : i(i_), j(j_) {}
};

A a{3,4};

struct B
{
    int i{1}, j{2};
    constexpr B(int i_, int j_) : i(i_), j(j_) {}
};

B b{3,4};
---- CUT ----
There is a big difference between B and A.  OPtimization has nothing to do with
it.  C++ says a has a dynamic constructor while b is required to be done
statically.  So GCC does not currently implement dynamic to static constructor
optimization while clang does.

There is another bug report which talks about the same.