[Bug c++/110835] New: -fsanitize=address causes slowdown from std::rethrow_exception not called

[ed at catmur dot uk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110835

            Bug ID: 110835
           Summary: -fsanitize=address causes slowdown from
                    std::rethrow_exception not called
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ed at catmur dot uk
  Target Milestone: ---

#include <exception>
std::exception_ptr p;
void f() {
  try { throw 1; } catch(char) { std::rethrow_exception(p); }
}
int main() {
  for (int i = 0; i != 100000; ++i)
    try { f(); } catch (...) { }
}

Compiled with -fsanitize=address (and at -O0 through -O3), this is roughly 30x
slower under gcc 13 than under gcc 12 (4.7s vs 0.15s on my Core i7 3 GHz).

Note that the std::rethrow_exception() is not called, but is still essential to
exhibit the bug. Also `f` needs to be a separate function (and not `static`).
At low optimization levels it can be an iife.