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An instruction set architecture (ISA) is an abstract model of a computer, also referred to as computer architecture.A realization of an ISA is called an implementation.An ISA permits multiple implementations that may vary in performance, physical size, and monetary cost (among other things); because the ISA serves as the interface between software and hardware.
Thumb-2 extends the limited 16-bit instruction set of Thumb with additional 32-bit instructions to give the instruction set more breadth, thus producing a variable-length instruction set. A stated aim for Thumb-2 was to achieve code density similar to Thumb with performance similar to the ARM instruction set on 32-bit memory.
The x86 instruction set refers to the set of instructions that x86-compatible microprocessors support. The instructions are usually part of an executable program, often stored as a computer file and executed on the processor. The x86 instruction set has been extended several times, introducing wider registers and datatypes as well as new ...
This is a comparison of ARM instruction set architecture application processor cores designed by Arm Holdings (ARM Cortex-A) and 3rd parties. It does not include ARM Cortex-R, ARM Cortex-M, or legacy ARM cores.
The first was the CISC (Complex Instruction Set Computer), which had many different instructions. In the 1970s, however, places like IBM did research and found that many instructions in the set could be eliminated. The result was the RISC (Reduced Instruction Set Computer), an architecture that uses a smaller set of instructions.
x86 (also known as 80x86 [3] or the 8086 family [4]) is a family of complex instruction set computer (CISC) instruction set architectures [a] initially developed by Intel, based on the 8086 microprocessor and its 8-bit-external-bus variant, the 8088.
ARM Cortex-A78: 2020 14 Out-of-order superscalar, register renaming, 4-way pipeline decode, 6 instruction per cycle, branch prediction, L3 cache ARM Cortex-A710: 2021 10 ARM Cortex-X1: 2020 13 5-wide decode out-of-order superscalar, L3 cache ARM Cortex-X2: 2021 10 ARM Cortex-X3: 2022 9 ARM Cortex-X4: 2023 10 AVR32 AP7: 7 AVR32 UC3: 3 Harvard ...
AArch64 Instruction Set (A64): The A64 instruction [25] set in the Cortex-R82 provides 64-bit data handling and operations, which improves performance for certain computational tasks and enhances overall system efficiency. [52] Example Instruction: ADD X0, X1, X2 adds the values in 64-bit registers X1 and X2 and stores the result in X0. This 64 ...