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- From: Vadim Zaliva <vzaliva AT cmu.edu>
- To: coq-club AT inria.fr
- Subject: Re: [Coq-Club] 64-bit integers
- Date: Thu, 25 Jan 2018 14:17:05 -0800
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Are there any plans to distribute this library as an OPAM package? What would be the recommended way to use it in somebody's Coq project?
Vadim
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CMU ECE PhD candidate
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On Sat, Jan 13, 2018 at 8:09 AM, Xavier Leroy <Xavier.Leroy AT inria.fr> wrote:
On 01/12/2018 11:32 PM, Eddy Westbrook wrote:
> Is there already a type of 64-bit integers in the Coq standard library? Or at least 32-bit integers? I see some evidence of these in the documentation of some of the numeric modules, but I don’t really understand them…
Maybe you stumbled on the 31-bit machine integers that are used in one of the implementations of (mathematical, arbitrary-precision) integers from Coq's standard library. But those 31-bit integers are not really usable on their own.
For N-bit integer arithmetic in the style of C or Java, you could use CompCert's "Integers" library,
http://compcert.inria.fr/doc/html/Integers.html
It defines (as a parameterized module) N-bit integers and their signed and unsigned arithmetic and logical operations, plus a whole lot of theorems about those operations. Instantiations for N=8, N=32 and N=64 are provided, with extra operations and theorems relating 32- and 64-bit integers.
- Xavier Leroy
- [Coq-Club] 64-bit integers, Eddy Westbrook, 01/12/2018
- Re: [Coq-Club] 64-bit integers, Xavier Leroy, 01/13/2018
- Re: [Coq-Club] 64-bit integers, Eddy Westbrook, 01/20/2018
- Re: [Coq-Club] 64-bit integers, Vadim Zaliva, 01/25/2018
- Re: [Coq-Club] 64-bit integers, Xavier Leroy, 01/13/2018
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