3 ms·
That’s… not true at all. You’re telling me that x86-64 and AArch64 don’t work on 64 bit words natively (despite being 64 bit architectures)? In fact, x86-64 ha
by colejohnson66 5y ago
That’s… not true at all. You’re telling me that x86-64 and AArch64 don’t work on 64 bit words natively (despite being 64 bit architectures)?
In fact, x86-64 has 256 bit data paths internally in some places.
- thehappypm 5y agoCheck this out: https://superuser.com/questions/168114/how-much-memory-can-a-64bit-machine-address-at-a-time https://superuser.com/questions/168114/how-much-memory-can-a... There’s no reason to actually support 64 bit lines.
- colejohnson66 5y agoAddress lines are not the same as data lines. Your original post mentioned “math”, which, to me, implied data, not addresses. Processors absolutely can do 64 bit math (integer and floating point; some can even do multiple at a time), but you are correct that 64 physical address line processors don’t exist…yet. It is entirely possible we’ll see servers with that many sometime in the next few decades.
- thehappypm 5y agoYou are correct, I should have been more clear. Point is that 64 bits is not always as it seems, and few people seem to know about the address line limitations.