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by microcolonel
3124 days ago
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After microcoding, this is all silly. What matters is how efficiently you can encode and communicate the μ-ops to the ROB. RISC-V, with the C extension (and using only today's nascent compiler backends!), has more-or-less the same μ-op density as x86-64 (with a good order of magnitude or two less complexity in the decoder), and considerably better density than AArch64, which completely lacks reduced width instructions. It's not that CISC won, it's that CISC (eventually) didn't lose to any great degree. |
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