• botengang@feddit.de
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    1 year ago

    Our modern 64 bit processors do use 128 bits for certain vector operations though, don’t they? So there is another aspect apart from address space.

    • I need NOS@lemm.ee
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      1 year ago

      Yes, up to 512 bits since Skylake. But there are very few real-world tasks that can make use of such wide data paths. One example is media processing, where a 512-bit register could be used to pack 8 64-bit operands and act on all of them simultaneously, because there is usually a steady stream of data to be process using similar operations. In other tasks, where processing patters can’t make use of such batched approaches, the extra bits would essentially be wasted.