https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115832
--- Comment #6 from Mohammed Faisal <faisal.irl2004 at gmail dot com> --- (In reply to Andrew Pinski from comment #4) > (In reply to Mohammed Faisal from comment #2) > > I have also tested this with gcc 13.2.1 on a different machine and found a > > similar slowdown. > > Testing this with clang 14.0.6 gives only about a 2x slowdown as opposed to > > the 13.5x slowdown with gcc. > > What is the relative difference in compiler speed between clang and GCC > (rather than between -O0 and -O2 -fsanitize=undefine)? Without std::sort time clang++ -stdlib=libstdc++ A.cpp -D_GLIBCXX_DEBUG -fsanitize=undefined -O2 real 0m0.334s user 0m0.275s sys 0m0.058s With std::sort time clang++ -stdlib=libstdc++ A.cpp -D_GLIBCXX_DEBUG -fsanitize=undefined -O2 real 0m0.643s user 0m0.584s sys 0m0.059s
