Yair Lifshitz wrote:
Hi,
I hope I'm not flooding with this topic. I've did some research and
couldn't find anything relevant on this topic.
My team is developing a large scale CAD application that has a large
memory footprint, requiring strong machines to run.
The application uses pointers massively.
During one of our optimization cycles I noticed that since most
objects are aligned on 8-byte boundaries, it's possible to drop the
lower 3 bits of the address and reconstruct the full address later.
Basically, as long as the application is in the 32G range (2^32*2^3),
it's possible to represent aligned pointers using an unsigned int - 4
bytes.
why not just run in 32 bit mode in this case?
What's the point of using 64-bit addresses if you
don't need them?
