"Flis, Przemyslaw (Nokia - PL/Wroclaw)" <przemyslaw.flis@xxxxxxxxx> writes: > as far as I know, the way of handling exceptions "under the hood" is > not defined in C++ standard. In "Technical report on C++ performance " > from 2008, I've found two main approaches to exception handling - so > called "code" and "table" approach. Is there any way to determine > which is used by gcc compiler? Does it depend on platform (i.e. ARM, > x86 etc.) or compiler version? It depends on architecture, compiler version, and how GCC is built for those architectures which support both approaches. I think the the default for the vast majority of architectures is table-based. > As far I understand "table" approach has almost zero time overhead > when exception does not appear. But when it does, is this time > overhead predictable? If it is, how to predict it? The overhead is not really predictable, except in very special cases. It can be huge in multi-threaded programs: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71744 Florian
