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{{title|RISC-V}}{{risc-v isa main}}
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{{title|RISC-V}}
'''RISC-V''' (pronounced ''risk-five'') is a free and open [[instruction set architecture]] standardized by the {{risc-v|Foundation|RISC-V Foundation}} that is specifically designed to enable configurability, modularity, and extensibility. RISC-V is not designed to replace prominent ISAs such as [[x86]] and [[ARM]], but rather to provide a foundation for emerging classes of [[processors]] and [[accelerators]] that require a base ISA on top of which additional functionality can be added.
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'''RISC-V''' (pronounced ''risk-five'') is a free and open [[instruction set architecture]] that is specifically designed to enable configurability, modularity, and extensibility. RISC-V is not designed to replace prominent ISAs such as [[x86]] and [[ARM]], but rather to provide a foundation for emerging classes of [[processors]] and [[accelerators]] that require a base ISA on top of which additional functionality can be added.
 
 
== Overview ==
 
RISC-V is a free and open ISA; no license is needed to be obtained and the use of the ISA royalty-free for anyone. RISC-V is designed to provide a foundation or a base architecture for companies and researchers who need it in order to be able to augment their own technology (e.g., customer [[accelerators]], fixed function hardware, and other domain-specific additions) on top of it. RISC-V provides a base architecture (offered in 3 flavors of 32/64/128 bit) consisting of less than 50 instructions which is capable of running a full software stack including a full-fledged operating system. The core instructions are frozen and are guaranteed to never change. In addition to the core instructions, RISC-V provides a number of optional standard extensions that can be implemented or omitted depending on the designer goals. Other than the standard extensions RISC-V also reserves opcodes to be custom tailored by chip designers for their own applications.
 
 
 
== Standardization ==
 
{{main|risc-v/foundation|l1=RISC-V Foundation}}
 
Standardization is done by the {{risc-v|Foundation|RISC-V Foundation}} which was established specifically for this purpose as well as to promote and protect the ISA. The foundation can also elevate non-standard (e.g., [[domain-specific extension|DSEs]]) to {{risc-v|standard extensions}} if determined robust and stable enough.
 
 
 
== Architecture ==
 
RISC-V is designed as a ''Base+Extension'' ISA whereby the architecture is broken down into a very minimal base architecture that is required in order to be able to get a full software stack including a full-fledged operating system and additional standard {{risc-v|extensions}} can be implemented when additional functionality is desired.
 
 
 
There are three RISC-V base instruction called {{risc-v|RV32I}}, {{risc-v|RV64I}}, and {{risc-v|RV128I}}. Those three variations only operate on integers and represent a {{arch|32}}, {{arch|64}}, and {{arch|128}} address space and [[register]] widths (i.e., word size). All RISC-V implementations must include the base {{risc-v|RV32I}} instructions. The two additional variations simply expand the RV32I register width and add a handful of additional data transfer instructions for working with wider words.
 
 
 
 
 
[[category:instruction set architectures]]
 
[[category:risc-v]]
 

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