<daveshah>
it's on if they are unused or the pin is not included in the design; off if the pin is included
<daveshah>
they are also on if the chip isn't configured
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<cr1901_modern>
git rev-list HEAD@{1}..HEAD | wc
<cr1901_modern>
Oh my... :o
<cr1901_modern>
1783 1783 73103
<cr1901_modern>
(And that was since January!)
<cr1901_modern>
I know I'm a bit late to the party, but what is "abc9" and how does it differ from "abc"?
<Lofty>
cr1901_modern: two things; ABC9 is box-aware (e.g. memories and flops are things that cannot be mapped by ABC but are important to know about), and it uses a generalised delay model (e.g. input->output path is measured in picoseconds, and varies for paths, which reflects real-life hardware better)
<Lofty>
Another important box is carry logic, where ABC9 can prune carry chains it can prove are unneeded
<cr1901_modern>
Is it a special input arg to abc or? I don't think I've ever conciously used it
<Lofty>
For Yosys flows, you can enable it with -abc9