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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.
In fact, over the years, RISC instruction sets have grown in size, and today many of them have a larger set of instructions than many CISC CPUs. [36] [37] Some RISC processors such as the PowerPC have instruction sets as large as the CISC IBM System/370, for example; conversely, the DEC PDP-8—clearly a CISC CPU because many of its ...
An early (retroactively) RISC-labeled processor (IBM 801 – IBM's Watson Research Center, mid-1970s) was a tightly pipelined simple machine originally intended to be used as an internal microcode kernel, or engine, in CISC designs, [citation needed] but also became the processor that introduced the RISC idea to a somewhat larger audience.
A RISC instruction set normally has a fixed instruction length, whereas a typical CISC instruction set has instructions of widely varying length. However, as RISC computers normally require more and often longer instructions to implement a given task, they inherently make less optimal use of bus bandwidth and cache memories.
ARC (Argonaut RISC Core) embedded system processors are a family of 32-bit and 64-bit reduced instruction set computer (RISC) central processing units (CPUs) originally designed by ARC International. ARC processors are configurable and extensible for a wide range of uses in system on a chip (SoC) devices, including storage, digital home, mobile ...
Intel's product marketing and industry engagement efforts were substantial and achieved design wins with the majority of enterprise server OEMs, including those based on RISC processors at the time. Industry analysts predicted that IA-64 would dominate in servers, workstations, and high-end desktops, and eventually supplant both RISC and CISC ...
Alpha (original name Alpha AXP) is a 64-bit reduced instruction set computer (RISC) instruction set architecture (ISA) developed by Digital Equipment Corporation (DEC). Alpha was designed to replace 32-bit VAX complex instruction set computers (CISC) and to be a highly competitive RISC processor for Unix workstations and similar markets.
RISC microprocessors like these were the first to have superscalar execution, because RISC architectures free transistors and die area which can be used to include multiple execution units and the traditional uniformity of the instruction set favors superscalar dispatch (this was why RISC designs were faster than CISC designs through the 1980s ...