kami VS CompCert

Compare kami vs CompCert and see what are their differences.


A Platform for High-Level Parametric Hardware Specification and its Modular Verification (by mit-plv)


The CompCert formally-verified C compiler (by AbsInt)
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kami CompCert
2 37
141 1,777
4.3% 1.5%
3.6 7.2
3 months ago 6 days ago
Coq Coq
MIT License GNU General Public License v3.0 or later
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
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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.


Posts with mentions or reviews of kami. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-12-03.


Posts with mentions or reviews of CompCert. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2024-01-31.
  • Differ: Tool for testing and validating transformed programs
    6 projects | news.ycombinator.com | 31 Jan 2024
    A big problem is that proving that transformations preserve semantics is very hard. Formal methods has huge potential and I believe it will be a big part of the future, but it hasn't become mainstream yet. Probably a big reason why is that right now it's simply not practical: the things you can prove are much more limited than the things you can do, and it's a lot less work to just create a large testsuite.

    Example: CompCert (https://compcert.org/), a formally-verified compiler AKA formally-verified sequence of semantics-preserving transformations from C code to Assembly. It's a great accomplishment, but few people are actually compiling their code with CompCert. Because GCC and LLVM are much faster[1], and have been used so widely that >99.9% of code is going to be compiled correctly, especially code which isn't doing anything extremely weird.

    But as articles like this show, no matter how large a testsuite there may always be bugs, tests will never provide the kind of guarantees formal verification does.

    [1] From CompCert, "Performance of the generated code is decent but not outstanding: on PowerPC, about 90% of the performance of GCC version 4 at optimization level 1"

  • So you think you know C?
    2 projects | news.ycombinator.com | 20 Jan 2024
  • Can the language of proof assistants be used for general purpose programming?
    3 projects | news.ycombinator.com | 27 Oct 2023
    Also a C compiler (https://compcert.org/). I did exaggerate bit in saying that anything non-trivial is "nearly impossible".

    However, both CompCert and sel4 took a few years to develop, whereas it would only take months if not weeks to make versions of both which aren't formally verified but heavily tested.

  • A Guide to Undefined Behavior in C and C++
    9 projects | news.ycombinator.com | 17 Aug 2023
    From my experience, while many MCUs have settled for the big compilers (GCC and Clang), DSPs and some FPGAs (not Intel and Xilinx, those have lately settled for Clang and a combination of Clang and GCC respectively) use some pretty bespoke compilers (just running ./ --version is enough to verify this, if the compiler even offers that option). That's not necessarily bad, since many of them offer some really useful features, but error messages can be really cryptic in some cases. Also some industries require use of verified compilers, like CompCert[1], and in such cases GCC and Clang just don't cut it.

    [1]: https://compcert.org/

  • Recently I am having too much friction with the borrow checker... Would you recommend I rewrite the compiler in another language, or keep trying to implement it in rust?
    1 project | /r/programmingcirclejerk | 27 Apr 2023
    CompCert sends its regards
  • Rosenpass – formally verified post-quantum WireGuard
    9 projects | news.ycombinator.com | 28 Feb 2023
  • OpenAI might be training its AI technology to replace some software engineers, report says
    4 projects | /r/programming | 28 Jan 2023
    But that's fine, because we can do even better with things like the CompCert C compiler, which is formally proven to produce correct asm output for ISO C 2011 source. It's designed for high-reliability, safety-critical applications; it's used for things like Airbus A380 avionics software, or control software for emergency generators at nuclear power plants. Software that's probably not overly sophisticated and doesn't need to be highly optimized, but does need to work ~100% correctly, ~100% of the time.
  • There is such thing called bugfree code.
    1 project | /r/ProgrammerHumor | 23 Dec 2022
    For context, CompCert is a formally verified compiler. My former advisor helped with a fuzzer called CSmith which found plenty of bugs in GCC and LLVM but not in CompCert.
  • Checked C
    14 projects | news.ycombinator.com | 21 Dec 2022
    Does anybody know how does this compare to https://compcert.org/ ?
  • Proofs about Programs
    1 project | news.ycombinator.com | 15 Dec 2022
    This is a common property for proof-oriented languages. Coq shares this property for instance, and you can write an optimizing C compiler in Coq: https://github.com/AbsInt/CompCert .

What are some alternatives?

When comparing kami and CompCert you can also consider the following projects:

koika - A core language for rule-based hardware design 🦑

seL4 - The seL4 microkernel

silveroak - Formal specification and verification of hardware, especially for security and privacy.

coq - Coq is a formal proof management system. It provides a formal language to write mathematical definitions, executable algorithms and theorems together with an environment for semi-interactive development of machine-checked proofs.

vericert - A formally verified high-level synthesis tool based on CompCert and written in Coq.

unbound - Replib: generic programming & Unbound: generic treatment of binders

hardware - Verilog development and verification project for HOL4


corn - Coq Repository at Nijmegen [maintainers=@spitters,@VincentSe]

winix - A UNIX-style Operating System for the Waikato RISC Architecture Microprocessor (WRAMP)