this post was submitted on 23 Jun 2024
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Why we don't have 128-bit CPUs (www.xda-developers.com)
submitted 5 months ago by jwr1@kbin.earth to c/technology@lemmy.world
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[โ€“] pivot_root@lemmy.world 0 points 5 months ago (1 children)

Being pedantic, but...

The amd64 ISA doesn't have native 256-bit integer operations, let alone 512-bit. Those numbers you mention are for SIMD instructions, which is just 8x 32-bit integer operations running at the same time.

[โ€“] barsoap@lemm.ee 0 points 5 months ago

The ISA does include sse2 though which is 128 bit, already more than the pointer width. They also doubled the number of xmm registers compared to 32-bit sse2.

Back in the days using those instructions often gained you nothing as the CPUs didn't come with enough APUs to actually do operations on the whole vector in parallel.