VolumeTracker should deal with Phi nodes appropriately
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- Dominant language
- Python
- Stars
- 53
- Forks
- 16
- PR merge metrics
- No merged PRs in 30d
Description
The volume tracker does not appropriately handle phi nodes.
The issue arises when a phi node exists in a loop header, where there is a use prior to a def, and has the following structure:
```
before_loop:
a0 = ...
loop_header:
a1 = phi(a0, a1)
loop_body:
... = use a1
```
A test case has been added to the volume tracking testing harness using tests/assays/probabilistic_pcr.bs as the model.
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the volume-tracking testing harness and the existing test case using tests/assays/probabilistic_pcr.bs. Reproduce the loop-header phi scenario with a use before the definition, then trace how the volume tracker handles the phi node. Done means the added test passes and this loop structure is handled appropriately.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 48/100