[Bug libstdc++/54075] [4.7.1] unordered_map insert 3x slower than 4.6.2

[fdumont at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54075

--- Comment #21 from François Dumont <fdumont at gcc dot gnu.org> 2012-07-27 07:57:59 UTC ---
I haven't touch the grow speed for the moment. I prefer to fix the reserve
Standard conformity first.

Now I can restore the 4.6 grow speed as it seems to be a relatively correct
one. Note that 3x slower with so many more rehash operations doesn't seem so
bad ! Of course growing faster will also induce higher memory consumption which
is not shown by the simple benchmark proposed here.