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If you go by pages in the specification https://people-mozilla.org/~sstangl/arm/AArch64-Reference-Manual.pdf https://people-mozilla.org/~sstangl/arm/AArch64-Re

• pcwalton 10y ago
  2,036 of those pages are for AArch32, though. In contrast to ARM, AMD didn't introduce a new instruction set for 32-bit x86. Personally, I prefer ARM's move, because while it's a complexity increase now, it paves the way to someday drop support for 32-bit ARM, which would be a major architectural simplification. It also means that, as a programmer, when you're in 64-bit mode you aren't burdened by all of that weird backwards compatibility stuff going back decades—you get a relatively clean ISA. (I do have some gripes with AArch64, to be fair: there are too many addressing modes and the condition codes are unnecessary. But I'll take anything that moves us in a more RISC-y direction.)