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Look at what ARM did with AArch64 though: it's backwards compatible via mode switching but is otherwise a fairly clean break at the ISA level. AMD probably cou
by pcwalton 10y ago
Look at what ARM did with AArch64 though: it's backwards compatible via mode switching but is otherwise a fairly clean break at the ISA level.
AMD probably could have done something similar. They just didn't, likely out of risk aversion.