r175906 - Replace some typically large vectors with SmallVector.

[Jordan Rose]

On Feb 22, 2013, at 13:40 , Sean Silva <silvas at purdue.edu> wrote:

> On Fri, Feb 22, 2013 at 1:29 PM, Benjamin Kramer
> <benny.kra at googlemail.com> wrote:
>> This may seem counter-intuitive but the POD-like optimization helps when the
>> vectors grow into multimegabyte buffers. SmallVector calls realloc which knows
>> how to twiddle virtual memory bits and avoids large copies.
> 
> Is this optimization something that libc++ should be doing?

I haven't looked but I would guess that libc++ uses is_trivially_movable/is_trivially_copyable instead of is_pod, and all of our isPODLike cases should be trivially copyable if not trivially movable.

Jordan