[MooreToCore] Lower moore.net to llhd.sig #7652
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Lower `moore.net` operations to the corresponding `llhd.sig`, similar to how `moore.variable` is lowered. This currently only makes sense for "wire" nets, since it's not yet clear how all the other net types map to LLHD.
maerhart
approved these changes
Oct 2, 2024
| return rewriter.notifyMatchFailure(loc, "invalid net type"); | ||
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| // TODO: Once the core dialects support four-valued integers, this code | ||
| // will additionally need to generate an all-X value for four-valued nets. |
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Shouldn't it be initialized to all Z once we support four-valued types? I think the standard mentions that as the default value in case there are no drivers.
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That is a good point! I'm also starting to wonder how we'll deal with multiple concurrent drivers on a net. That doesn't easily map to llhd.sig at the moment. It's more like you'd have a list of multiple llhd.sig, one for each driver, and you'd then have a conflict resolution step that merges all the drivers into a final net value. We might need a slightly different lowering in the future 🤔
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Lower
moore.netoperations to the correspondingllhd.sig, similar to howmoore.variableis lowered. This currently only makes sense for "wire" nets, since it's not yet clear how all the other net types map to LLHD.