riscv-opcodes | repo enumerates standard RISC-V instruction opcodes

by riscv Python Version: Current License: BSD-3-Clause

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kandi X-RAY | riscv-opcodes Summary

riscv-opcodes is a Python library. riscv-opcodes has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has low support. You can download it from GitHub.

RISC-V Opcodes

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riscv-opcodes has a low active ecosystem.

It has 489 star(s) with 219 fork(s). There are 83 watchers for this library.

It had no major release in the last 6 months.

There are 17 open issues and 29 have been closed. On average issues are closed in 20 days. There are 4 open pull requests and 0 closed requests.

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riscv-opcodes has 0 bugs and 0 code smells.

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riscv-opcodes code analysis shows 0 unresolved vulnerabilities.

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riscv-opcodes is licensed under the BSD-3-Clause License. This license is Permissive.

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riscv-opcodes releases are not available. You will need to build from source code and install.

Build file is available. You can build the component from source.

Top functions reviewed by kandi - BETA

kandi has reviewed riscv-opcodes and discovered the below as its top functions. This is intended to give you an instant insight into riscv-opcodes implemented functionality, and help decide if they suit your requirements.

Create a dictionary of rules from the file_filter
Process an encoding line
Return True if two base extensions are same
Create a latex table
Make a latex table
Creates a dictionary of rules from the file_filter
Make Go code
Return a signed integer
Make CSR code
Make Chisel
Create the priv - instruction table
Create sverilog file
Make the rust code

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Community Discussions

Trending Discussions on riscv-opcodes

riscv-opcodes on github are different than opcodes from risc-v specs

QUESTION

riscv-opcodes on github are different than opcodes from risc-v specs

Asked 2019-Jan-28 at 19:12

I'm still new to RISC-V and assembly coding. I want to have the opcode / binary value of the commands. But it confuses me that A. different pages list diffent opcodes of the commands and B. 10 commands have the same opcode. I suspect the aswer to B is that different commands describe the same mechanic but Im still not sure which opcodes are the right ones.

Source: https://github.com/riscv/riscv-opcodes/blob/20e4f0285c563e5a403bd6ba735beadbbd3c203e/opcodes add rd rs1 rs2 16=0 15..10=0 9..7=0 6..2=0x0C 1..0=3

Source: https://content.riscv.org/wp-content/uploads/2017/05/riscv-spec-v2.2.pdf 0110011 ADD

So why says the github page that the opcode of ADD is 0C which is 12 in decimal while 0110011 ist 51 in decimal?

Greetings.

...

ANSWER

Answered 2019-Jan-28 at 19:12

The first 7 bits represent an instruction's opcode. Both the github source and the pdf are listing the same opcode for ADD. 0x0C = 0000_1100 binary. But the github source says 5 bits (6..2), so 0x0C = 01100 binary. The first 2 bits of any valid opcode are always 11 binary. Concatenate 01100 11 together and you get 0110011 binary, 51 decimal.

Visually (with bitwise leftshift then OR):

Source https://stackoverflow.com/questions/54230582

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

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Install riscv-opcodes

You can download it from GitHub.
You can use riscv-opcodes like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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