https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90295
Mathias Stearn <redbeard0531 at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |redbeard0531 at gmail dot com
--- Comment #2 from Mathias Stearn <redbeard0531 at gmail dot com> ---
This will become more of a problem with C++ coroutines where in many cases the
compiler can prove that no exception will be thrown, but the generator or task
type will still have overhead from an exception_ptr member that the compiler
can't eliminate at the moment.
A handful of additional methods should probably either be completely inline or
have a nullptr fast-path: https://godbolt.org/z/zP6DSJ
default ctor
copy ctor
copy assign
swap
operator==
operator!=
Example showing significant codegen at -O3 which should all optimize away:
#include <exception>
bool test() {
std::exception_ptr p1;
std::exception_ptr p2 (p1);
p1 = p2;
swap(p1, p2);
return p1 == nullptr && nullptr == p2 && p1 == p2;
}
