When an in parameter is copied (type is small and trivially copyable), there's no need to pass an extra bit to remember whether it was a non-const rvalue.
Repro 1, extra instruction at the call site for an in int parameter: https://cppx.godbolt.org/z/fz78YW
Repro 2, two extra instructions in the callee for an in int parameter: https://cppx.godbolt.org/z/c8rYdY
When an
inparameter is copied (type is small and trivially copyable), there's no need to pass an extra bit to remember whether it was a non-const rvalue.Repro 1, extra instruction at the call site for an
in intparameter: https://cppx.godbolt.org/z/fz78YWRepro 2, two extra instructions in the callee for an
in intparameter: https://cppx.godbolt.org/z/c8rYdY