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ice40: Improving routeability of carries

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Signed-off-by: David Shah <davey1576@gmail.com>
This commit is contained in:
David Shah 2018-07-03 14:47:41 +02:00
parent 59b2091f77
commit 5ca76461da
1 changed files with 1 additions and 6 deletions
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7
ice40/place_legaliser.cc
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@ -366,12 +366,7 @@ class PlacementLegaliser
cout_port.net->driver = o_r;
lc->ports.at(ctx->id("I3")).net = co_i3_net.get();
cout_port.net = co_i3_net.get();
// I1=1 feeds carry up the chain, so no need to actually break the chain
lc->ports.at(ctx->id("I1")).net = ctx->nets.at(ctx->id("$PACKER_VCC_NET")).get();
PortRef i1_r;
i1_r.port = ctx->id("I1");
i1_r.cell = lc.get();
ctx->nets.at(ctx->id("$PACKER_VCC_NET"))->users.push_back(i1_r);
IdString co_i3_name = co_i3_net->name;
assert(ctx->nets.find(co_i3_name) == ctx->nets.end());
ctx->nets[co_i3_name] = std::move(co_i3_net);