We don’t even have true 64-bit addressing yet. x86-64 uses only 48 bits of a 64 bit address and 64-bit ARM can use anything between 40 and 52 depending on the specific configuration.
I bet you just recycle thoughts and comments because you have none of your own, but want to feel that “upside” of your sad interaction with people on the Internet.
Some applications use those unused bits to add tags to pointers but it’s important to mask those out before attempting to dereference the address. I’m not sure about ARM but x86-64 requires bits 49-63 to be copies of bit 48 (kinda like sign-extension), ironically to ensure that no one is using those bits to store extra data.
We don’t even have true 64-bit addressing yet. x86-64 uses only 48 bits of a 64 bit address and 64-bit ARM can use anything between 40 and 52 depending on the specific configuration.
What about this is not my point?
I bet you’re fun at parties.
I bet you just recycle thoughts and comments because you have none of your own, but want to feel that “upside” of your sad interaction with people on the Internet.
Jesus Christ, what crawled up your ass and died?
I actually added detail that wasn’t already discussed in the article?
I actually didn’t know that about addressing before your comment and so I found it very interesting, thanks
Some applications use those unused bits to add tags to pointers but it’s important to mask those out before attempting to dereference the address. I’m not sure about ARM but x86-64 requires bits 49-63 to be copies of bit 48 (kinda like sign-extension), ironically to ensure that no one is using those bits to store extra data.
I think they were just adding to the conversation