Add Helion language support

[oulgen]

Helion is a Python-embedded domain-specific language (DSL) for authoring machine learning kernels, designed to compile down to Triton.

https://github.com/pytorch/helion

I mostly followed the Triton example, please let me know if there's more I need to do or anything I missed.

compiler-explorer PR: compiler-explorer/compiler-explorer#8206

[mattgodbolt]

You should be able to test this locally with bin/ce_install install helion or similar. There's some directories we try to install to (/opt/compiler-explorer) but if you can't make them, then there's CLI flags to set the destination.

[mattgodbolt]

this should be helion

[oulgen]

Thanks @mattgodbolt

I've run

(py312) ➜  compiler-explorer-infra git:(helion) ./bin/ce_install install helion     
warning: `VIRTUAL_ENV=/home/oulgen/py312` does not match the project environment path `.venv` and will be ignored; use `--active` to target the active environment instead
2025-10-25 11:15:35,656 lib.ce_install  INFO     Creating thread pool with 8 workers
Installing compilers/helion 0.2.0
2025-10-25 11:15:36,813 compilers/helion 0.2.0 INFO     Installing required dependee S3TarballInstallable(compilers/python 3.12.1, python-3.12.1)
2025-10-25 11:15:37,148 lib.installation_context INFO     Fetching https://s3.amazonaws.com/compiler-explorer/opt/python-3.12.1.tar.xz (21902224 bytes)
2025-10-25 11:15:38,707 lib.installation_context INFO     100% of https://s3.amazonaws.com/compiler-explorer/opt/python-3.12.1.tar.xz
2025-10-25 11:15:38,708 lib.installation_context INFO     Piping to tar Jxf -
2025-10-25 11:15:39,086 lib.installation_context INFO     Moving from staging (/opt/compiler-explorer/staging/df3e98b4-4438-435f-8da3-ceddf5e25d37/python-3.12.1) to final destination (/opt/compiler-explorer/python-3.12.1)

[notice] A new release of pip is available: 23.2.1 -> 25.3
[notice] To update, run: /opt/compiler-explorer/staging/f3e804f0-72d8-42a8-bf71-4412d22378e3/helion/v0.2.0/bin/python3.12 -m pip install --upgrade pip
2025-10-25 11:17:31,262 lib.installation_context INFO     Moving from staging (/opt/compiler-explorer/staging/f3e804f0-72d8-42a8-bf71-4412d22378e3/helion/v0.2.0) to final destination (/opt/compiler-explorer/helion/v0.2.0)
2025-10-25 11:17:34,959 lib.ce_install  INFO     compilers/helion 0.2.0 installed OK
1 packages installed OK, 0 skipped, and 0 failed installation

and was successfully able to install.

I tried to run the GH action: https://github.com/compiler-explorer/infra/actions/workflows/bespoke-build.yaml but I dont seem to have permissions. Is there anything else you'd like me to do on this PR?

[oulgen]

I've also updated the corresponding compiler-explorer PR: compiler-explorer/compiler-explorer#8206