http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54075
--- Comment #6 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-07-24 00:29:38 UTC --- In some cases 4.6.x was handling max_load_factor incorrectly. Thus, the idea isn't comparing 4.6.x to 4.7.x with the same max_load_factor (I don't think it's useful), instead, actually measure load_factor(s), see if for some values of max_load_factor, the actual load_factor(s) are different in 4.6.x vs 4.7.x. In any case, measure the actual load_factor while the map grows.