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A comment on Arm Unveils Next-Gen Flagship Core: Cortex-X3. Parent comment

Re:Arm Unveils Next-Gen Flagship Core: Cortex-X3 by imoverclocked on Wednesday June 29, 2022 @03:51PM (#31924925)
There are also benefits to cleaning up silicon. Eg: less transistors per core can mean more cores or less power or both.
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Re:Arm Unveils Next-Gen Flagship Core: Cortex-X3 by chasil on Wednesday June 29, 2022 @04:22PM (#31925270)
If this were the case, then it would be better still to design a totally new instruction set.

Why cling to any remnant?

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Re:Arm Unveils Next-Gen Flagship Core: Cortex-X3 by msbarnett on Wednesday June 29, 2022 @05:00PM (#31925642)
AArch64 is, effectively, a totally new instruction set. It was designed to allow for fully regular decoding, unlike AArch32 & Thumb, which is a big part of why getting those off of the chip is a big win – it's not just the decoders you clean up, you can now make your pipeline and speculation deeper because you can peek N instructions into the future without having to decode the N-1 instructions in front of it first to figure out where the Nth instruction lies. That's part of why you see AArch64-only designs like this and the A12+ cores with much larger reorder buffers.
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