whitequark changed the topic of #yosys to: Yosys Open SYnthesis Suite: https://github.com/YosysHQ/yosys/ | Channel logs: https://libera.irclog.whitequark.org/yosys/ | Bridged to #yosys:matrix.org
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<Myrl-saki> povik: 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.
<Myrl-saki> Can 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/4000
<Myrl-saki> I encountered this when my ALU would sometimes produce 3 $alu cells.
<Myrl-saki> Hm.
<Myrl-saki> Is Gowin weird in how its MUXs work? I don't see how 100/220/460 works.
<Myrl-saki> Actually I think I understand it a bit better now. A MUX4 needs 3 MUX2s, i.e. 300 cost.
<Myrl-saki> And I guess it's 220, so if it needs a decoder, it becomes 220 + 90 = 310
<Myrl-saki> Much less weird than say 211?
<Myrl-saki> Hm, I think pmuxtree is not the best thing to try this on.
<Myrl-saki> Seems like pmux2shiftx to techmap has the best results?
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