riscv-boom
XiangShan
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riscv-boom | XiangShan | |
---|---|---|
12 | 32 | |
1,593 | 4,305 | |
3.0% | 2.4% | |
7.2 | 9.3 | |
about 1 month ago | 7 days ago | |
Scala | Scala | |
BSD 3-clause "New" or "Revised" License | GNU General Public License v3.0 or later |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
riscv-boom
- Is RISC-V ready for HPC? Evaluating the 64-core Sophon SG2042 RISC-V CPU
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Cascade: CPU Fuzzing via Intricate Program Generation
Looks like from Appendix D that only 2 bugs were found in BOOM:
> 1. Inaccurate instruction count when minstret is written by software
I don't know what that means, but having minstret written by software was definitely not something I ever tested. In general, perf counters are likely to be undertested.
> 2. Static rounding is ignored for fdiv.s and fsqrt.s
A mistake was made in only listening to the dynamic rounding mode for the fdiv/sqrt unit. This is one of those bugs that is trivially found if you test for it, but it turns out that no benchmarking ever cared about this and from all of the fuzzers I used when I worked on BOOM, NONE of them hit it (including commercial ones...). Ooops.
Fixed here: https://github.com/riscv-boom/riscv-boom/pull/629/files
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In your opinion, what is the most advanced open source softcore processor?
The two most micro architecturally advanced cores that I know of are BOOM, an out of order RV64GC core with all the features you expect plus sort of weird fancy things like short forward branch predication, and VROOM, another out of order RV64GC core with things like uop fusion and a trace cache.
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PyXHDL - Python Frontend For VHDL And Verilog
it is used in the Berkley Out-of-Order RISC-V processor: https://github.com/riscv-boom/riscv-boom
- Semidynamics Unveils First Customizable RISC-V Cores for End Users
- TechTechPotato (Dr Ian Cutress): "Building High-Performance RISC-V Cores for Everything"
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Open-source RISC-V CPU projects for contribution
SonicBOOM: https://github.com/riscv-boom/riscv-boom
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The Surprising Subtleties of Zeroing a Register
Some cores are open source and you can see for yourself.
Rename logic from BOOM, a RISC-V core written in a DSL embedded in Scala:
https://github.com/riscv-boom/riscv-boom/blob/1ef2bc6f6c98e5...
From RSD, a core designed for FPGAs written in SystemVerilog:
https://github.com/rsd-devel/rsd/blob/master/Processor/Src/R...
And then there's the recently open-sourced XuanTie C910, which contains this Verilog… which is completely unreadable. Seems like it was produced by some kind of code generator that they didn't open-source?
https://github.com/T-head-Semi/openc910/blob/d4a3b947ec9bb8f...
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Anandtech: "IBM Power10 Coming To Market: E1080 for 'Frictionless Hybrid Cloud Experiences'"
We don't have Sifive's specifically but we do have the open source cores they've historically used to design their cores: https://github.com/riscv-boom/riscv-boom https://github.com/chipsalliance/rocket-chip
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Fence instruction implementation in BOOM
If you look at the decoder (https://github.com/riscv-boom/riscv-boom/blob/master/src/main/scala/exu/decode.scala), you can see that the fence instructions are also marked as "unique" instructions. Only one "unique" instruction is allowed in the pipeline at a time.
XiangShan
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Loongson 3A6000: A Star Among Chinese CPUs
Are you calling for the government to pick a winner? The Chinese word for this fierce if at times chaotic competition is "juan". It worked for them in EV and PV. The outcome remains to be seen in chips and commercial space launches. But even their mostly (ex-)students-run open source Xiangshan RiscV project https://github.com/OpenXiangShan/XiangShan shows a remarkable level of sophistication.
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MRISC32 – An Open 32-Bit RISC/Vector ISA (Suitable for FPGA CPU)
> Certainly no RISC-V implementations that are in the hands of customers right now do any fusion and it doesn't seem to hurt their ability to match or exceed the performance of similar Arm cores (A55, A72).
You can play around with OpenXianShan though, they have a few fusion targets: https://github.com/OpenXiangShan/XiangShan/blob/master/src/m...
Most of the targets require the same destination, so it won't be able to fuse current codegen. I suppose there is still some time before compilers need to be ready, but it's not that much.
> Perhaps they will provide compiler patches if required.
I hope so, btw t-head seems to be still be trying to upstream XTheadVector: https://gcc.gnu.org/pipermail/gcc-patches/2024-January/64278...
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Ask HN: Are there any open source dual-issue RISC-V processor
This is the most advanced open source risc-v implementation I'm awair of: https://github.com/OpenXiangShan/XiangShan
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How can I leverage RISC-V in my final year Electrical & Electronics Engineering project? Seeking advice and project ideas.
Maybe implement a big feature for a open source design? like vroom or xiangshan.
- 大炼芯运动彻底破产,跪舔韩国要技术
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New processor, OS to propel open-source chip ecosystem
I did know about XiangShan, but not Aolai. Is it a Linux distribution?
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How to build a Startup use open source chips
If you are interested in high performance look into vroom , c910 and xianghan, maybe you could adopt one of them.
- Open-source high-performance RISC-V processor
What are some alternatives?
rocket-chip - Rocket Chip Generator
openc910 - OpenXuantie - OpenC910 Core
darkriscv - opensouce RISC-V cpu core implemented in Verilog from scratch in one night!
rsd - RSD: RISC-V Out-of-Order Superscalar Processor
peakperf - Achieve peak performance on x86 CPUs and NVIDIA GPUs
riscv-mini - Simple RISC-V 3-stage Pipeline in Chisel
chisel - Chisel: A Modern Hardware Design Language
Cores-VeeR-EL2 - VeeR EL2 Core
redroid-doc - redroid (Remote-Android) is a multi-arch, GPU enabled, Android in Cloud solution. Track issues / docs here
Cores-VeeR-EH1 - VeeR EH1 core
cpufetch - Simple yet fancy CPU architecture fetching tool