this post was submitted on 23 Jun 2024
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276
Why we don't have 128-bit CPUs (www.xda-developers.com)
submitted 4 months ago by [email protected] to c/[email protected]
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[–] [email protected] 3 points 4 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.