Niels Dekker, LKEB, Leiden University Medical Center, 2021
A performance effect was reported by gast128, April 16, 2020 who wrote at C++11 noexcept implementation still a performance loss with VS2017?:
We use Visual Studio 2017 15.9.22 x64 build and we observe now that an inline / constexpr DLL exported constructor is not inlined with noexcept.
This Visual Studio project allows comparing the assember output when using noexcept to the assember output without noexcept, from a call to an inline member function of a DLL-experted class (test_exe/test_main.cpp):
obj.inline_get_data();
It appears that when exported_class::inline_get_data() is marked noexcept, the function call is not inline-expanded, as the assembler output will then have a line like this:
00 call QWORD PTR __imp_?inline_get_data@exported_class@@QEBAHXZ
The test executable appears significantly slower when using noexcept.
Which may be observed at Azure Pipelines dekkerware/Pipelines/N-Dekker.noexcept_inline_DLL_benchmark