Friday, 2023-10-13

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Myrl-sakipovik: I'll be honest: I don't know. For things which are naturally muxfull, it does have better QoR I think. `x[sel]` for example seems to be better. But for everything else, it seems to regress.00:13
Myrl-sakiI built things using this: https://gist.github.com/adrianparvino/a58ee7a5d67224507604605d6768b17e00:13
Myrl-sakiCan I have this reviewed? It's I think much simpler and I don't think there should any be regressions. https://github.com/YosysHQ/yosys/pull/400000:22
Myrl-sakiI encountered this when my ALU would sometimes produce 3 $alu cells.00:22
Myrl-sakiHm.04:57
Myrl-sakiIs Gowin weird in how its MUXs work? I don't see how 100/220/460 works.04:59
Myrl-sakiActually I think I understand it a bit better now. A MUX4 needs 3 MUX2s, i.e. 300 cost.05:02
Myrl-sakiAnd I guess it's 220, so if it needs a decoder, it becomes 220 + 90 = 31005:11
Myrl-sakiMuch less weird than say 211?05:11
Myrl-sakiHm, I think pmuxtree is not the best thing to try this on.05:14
Myrl-sakiSeems like pmux2shiftx to techmap has the best results?05:20
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