> 1) it looks a lot worse than 1% The 9% / 28% are for -fsanitize=signed-integer-overflow,unsigned-integer-overflow, which prints a warning on overflow. The v

> 1) it looks a lot worse than 1% The 9% / 28% are for -fsanitize=signed-integer-overflow,unsigned-integer-overflow, which prints a warning on overflow. The version with -fsanitize-undefined-trap-on-error, which aborts the process, only causes a slowdown of 0-1%.