I’m curious — are there structural differences in the ISA itself hypothesized to make ARM ultimately more power efficient than x86? I just bumped into the concept that certain instructions can have a heavier “power license” that can slow down an entire core or even socket, so?
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I believe a lot of that stuff is gone in ARMv8, but people don't really talk about the ARMv7 penalty the way people talk about the x86 penalty even though I think these two things aren't really so different, so I think it's mostly cultural that people say this about x86.
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I'm not saying you can't do better than x86. You can do better. But if I were trying to make a low power chip with at-least iPhone performance, x86 or not would be the low order bit behind having a good micro-arch, making sure we have good circuit designers, etc.
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