Memory Limitations
See also: x86-64 (Virtual address space section)While register sizes have increased to 64 bits from the previous x86 architecture, memory addressing has not yet been increased to the full 64 bits. For the time being, it is impractical to equip computers with sufficient memory to require a full 64 bits. As long as that remains the case, load/store unit(s), cache tags, MMUs and TLBs can be simplified without any loss of usable memory. Despite this limitation, software is programmed using full 64-bit pointers, and will therefore be able to use progressively larger address spaces as they become supported by future processors and operating systems.
Read more about this topic: Long Mode
Famous quotes containing the words memory and/or limitations:
“The secret of success in society, is a certain heartiness and sympathy. A man who is not happy in the company, cannot find any word in his memory that will fit the occasion. All his information is a little impertinent. A man who is happy there, finds in every turn of the conversation equally lucky occasions for the introduction of that which he has to say.”
—Ralph Waldo Emerson (1803–1882)
“The limitations of pleasure cannot be overcome by more pleasure.”
—Mason Cooley (b. 1927)