Will there be a chiseltest 6.0.0?

[schoeberl]

The verification story of new Chisel (CIRCT) needs more hands to move forward.

[ekiwi]

There currently is a 6.0-SNAPSHOT. Once Chisel 6 is released and I have some free time, I was planning on taking whatever we have at that point in 6.0-SNAPSHOT and putting it into a 6.0.0 release.

Note: chiseltest 6.0.0 won't be using CIRCT though which will limit access to some of the newer features.

[schoeberl]

Great! I know that chiseltest (6.0) is not using CIRCT, but it will keep testing alive as it is. We need some more manpower for the verification side on new Chisel.

[gonsolo]

As I said in chipsalliance/chisel#3746 I hope this gets resolved. Also my hope is that in the future chisel 7 would get released together with chiseltest 7 and chisel-template 7!

[kammoh]

@gonsolo
Could you please give the latest 6.0-SNAPSHOT a try? #705 should probably have resolved that issue.

[ezhes]

Is 6.0-SNAPSHOT released somewhere? Not sure how to actually get it, doesn't appear in any package repositories:

[error] stack trace is suppressed; run last update for the full output
[error] (update) sbt.librarymanagement.ResolveException: Error downloading edu.berkeley.cs:chiseltest_2.13:6.0-SNAPSHOT
[error]   Not found
[error]   Not found
[error]   not found: /home/xxx/.ivy2/localedu.berkeley.cs/chiseltest_2.13/6.0-SNAPSHOT/ivys/ivy.xml
[error]   not found: https://repo1.maven.org/maven2/edu/berkeley/cs/chiseltest_2.13/6.0-SNAPSHOT/chiseltest_2.13-6.0-SNAPSHOT.pom
[error] Total time: 3 s, completed Feb 10, 2024, 6:47:10 PM

[ekiwi]

You need to have the snapshot resolver enabled in your build.sbt:

resolvers ++= Resolver.sonatypeOssRepos("snapshots"),

I am still planning to release 6.0, just have been pretty busy recently.

[gonsolo]

@gonsolo Could you please give the latest 6.0-SNAPSHOT a try? #705 should probably have resolved that issue.

I changed chiselVersion to 6.0.0, chiseltest to 6.0-SNAPSHOT, and the following error occurs with 'sbt test':

[info] java.lang.NoClassDefFoundError: chisel3/internal/firrtl/Width
[info] at chiseltest.package$testableBool.poke(package.scala:34)
[info] at chiseltest.package$testableData.pokeInternal(package.scala:197)
[info] at chiseltest.package$testableData.poke(package.scala:171)

I had local firtool version 1.37.0, but upgrading to 1.65.0 didn't change the error.

[rameloni]

There currently is a 6.0-SNAPSHOT. Once Chisel 6 is released and I have some free time, I was planning on taking whatever we have at that point in 6.0-SNAPSHOT and putting it into a 6.0.0 release.

Note: chiseltest 6.0.0 won't be using CIRCT though which will limit access to some of the newer features.

@ekiwi so, will chiseltest 6.0.0 keep using the same elaboration steps of chiseltest 5? SFC instead of firtool?

[gonsolo]

This might be of interest: chipsalliance/chisel#3746 (comment)

[rameloni]

This might be of interest: chipsalliance/chisel#3746 (comment)

@gonsolo I see. Then what cases are users supposed to use chiseltest instead of chiselsim? What are the advantages of using chiseltest?

However, this is something pretty recent, it was published yesterday.

[gonsolo]

@gonsolo I see. Then what cases are users supposed to use chiseltest instead of chiselsim? What are the advantages of using chiseltest?

None. My (fairly basic) understanding is this: chiseltest will go away, you have svsim which is based on verilator, and now ChiselSim on top of svsim which provides a similar experience as chiseltest (peek & poke, more advanced things like fork/join maybe in the making).

However, this is something pretty recent, it was published yesterday.

Let's see how it's going to evolve.

[rameloni]

eek & poke, more advanced things like fork/join maybe in the making).

I quickly checked it and I don't see also the support for waveform emission.

[gonsolo]

I quickly checked it and I don't see also the support for waveform emission.

You can do this in Verilator, I guess it's just a matter of adding some support for that in ChiselSim and svsim.

Again, I just glanced over this yesterday and I might be wrong.

(But if I'm right I believe patches would be welcome. 😄)

[rameloni]

I think I got it, it seems that EphemeralSimulator is just a super simple lightweight simulator that just executes verilator.

[ekiwi]

Here we go! Finally a 6.0.0 release: https://github.com/ucb-bar/chiseltest/releases/tag/v6.0.0

[schoeberl]

Very good! I will try it out tomorrow.

Gratulations on your ASPLOS paper! Nice work and nice reading.

Cheers,
Martin