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by diamondlovesyou
1146 days ago
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CISC vs RISC doesn't matter. An ISA should ideally be a healthy mixture of both (citation needed). Arm64 allows memory operands, "just" like x86; but it still has code size issues. Memory operands (ie having a bit of address calculation in the load that's fused into its use) are very useful for reducing register pressure, which is an issue that every call ABI must contend with. This is something that the RISC ISA totally misses (and ARM64.. isn't really RISC). The issue with this "debate" is that it misses the forest for trees. Instead we should be talking about binary encoding (ie how much "variability" is required), and you're right on that bit; memory isn't the issue it once was. |
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Citation needed. It's a load/store ISA, with arithmetic taking place only register-to-register.