Registers (visible to the ISA)

• Integer (Generally 32 but see x86)

• Floating-point (Generally 32 but see x86)

• Some GPR are special

  • stack pointer, frame pointer, even the PC (VAX)

• Some registers have special functions

  • control registers, segment registers (x86)

• Flat registers vs. windows (Sparc) or hierarchy (Cray)

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