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| emeb | Hmmm... tried that on my up5k design and didn't see much effect. What's it supposed to help? | 00:30 |
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| daveshah | mithro: no there isn't a nextpnr channel, but here is fine | 07:46 |
| daveshah | In any case those two options are Yosys options and would affect QoR for any place and route flow | 07:47 |
| daveshah | From my experience those options, particularly dffe_min_ce_use, don't always improve QoR and sometimes make it worse | 07:48 |
| daveshah | Hence not making them defaults for the time being | 07:48 |
| daveshah | In terms of nextpnr options, might be worth looking at the HeAP placer (-placer heap) | 07:48 |
| daveshah | Doesn't always massively improve QoR, but is a lot faster on bigger designs | 07:49 |
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| thasti | I've started work on adding support for wand/wor nettypes to Yosys (as i need it for code generated by a tool I can't easily change). Would the preferred solution deal with this during generation of RTLIL from the AST, or would it be cleaner to introduce an additional proc_-pass that creates $reduce_or/$reduce_and cells from these wires? | 09:54 |
| daveshah | I'd probably favour putting it in RTLIL generation so it's not something that any other pass needs to be aware of in any way | 09:59 |
| thasti | Makes sense. I'll try to see if I can wrap my head around the logic there. | 10:03 |
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