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All 16 of the x64 architecture's G.P. registers can be addressed as 16-bit registers, using the names AX, BX, CX, DX, SI, DI, BP, SP, R8w, R9w, R10w, R11w, R12w, R13w, R14w, and R15w.

Using SP as a G.P. register is not a good idea, however, since this will conflict with its function as the stack pointer.

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