Index register

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An index register is a processor register used for pointing to an operand address within memory. It is useful when iterating through strings and arrays, and can also be used for holding loop iteration and other counters. In some architectures, it is used for reading/writing large blocks of memory.

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Processor technologies

Instruction set architecture

Types	CISC RISC ASIC
Instruction sets	ARM Intel Intel 4004 Intel 8008 Intel 8080 Intel x86 Intel x86-64 MOS Technologies/WDC 6502 65816 Motorola Motorola 6800 Motorola 68000 Zilog Zilog Z80

Types	Central processing unit (CPU) Graphics processing unit (GPU) Floating-point processing unit (FPU) Vector Barrel Stream Coprocessor PAL CPLD FPGA
By application	Embedded system Microprocessor Microcontroller

Core count

Components

Functional units	Arithmetic logic unit (ALU) Address generation unit (AGU) Floating-point unit (FPU) Memory management unit (MMU) Branch predictor Branch target predictor Instruction decoder
Registers	General register Status register Stack register Program counter Accumulator Index register Memory buffer Memory address register Register file

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