The lower 32 bits, 16 bits, and 8 bits of each register are directly addressable in operands. The new registers are named r8 through r15. ![]() ![]() For example, the 64-bit extension of eax is called rax. The 64-bit registers have names beginning with "r". X64 extends x86's 8 general-purpose registers to be 64-bit, and adds 8 new 64-bit registers. The instruction sets are almost identical. The term "圆4" includes both AMD 64 and Intel64. It provides a new 64-bit mode and a legacy 32-bit mode, which is identical to x86. ![]() The 圆4 architecture is a backwards-compatible extension of x86.
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