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Why doesn't Lattice 3-stage mult synthesize anymore after adding D inputs? #290

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gussmith23 opened this issue Jul 20, 2023 · 3 comments
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Why doesn't Lattice 3-stage mult synthesize anymore after adding D inputs? #290

gussmith23 opened this issue Jul 20, 2023 · 3 comments
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#255 seems to break 3-stage mult on Lattice, despite barely touching Lattice at all. What happened?
@gussmith23 gussmith23 self-assigned this Jul 20, 2023
@gussmith23
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This past week I've been having a bunch of problems related to the solver not terminating, and beginning to terminate once we add some little trick here or there. I could spend time trying to fiddle with different solvers (but then they need to be added to Rosette, which isn't easy) or with internal solver flags (but I don't know what the flags do, so that isn't time well spent). The other thing to do is to just fiddle with the problem (i.e. change things to constants in the yaml) and pray it fixes things. It's not sustainable, but I'm not sure what other option I have.

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Unsurprisingly, skipping over the ALU fixes things.

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I fixed this (temporarily) by just setting more things to constants in the YAML. See #255 .

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