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ice40: Include I3 connectivity in chain

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Thanks @smunaut

Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2018-12-04 12:02:26 +00:00
parent 12aca1558f
commit 0c93b55650
1 changed files with 24 additions and 22 deletions
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20
ice40/chains.cc
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@ -163,8 +163,8 @@ class ChainConstrainer
void process_carries()
{
std::vector<CellChain> carry_chains =
find_chains(ctx, [](const Context *ctx, const CellInfo *cell) { return is_lc(ctx, cell); },
std::vector<CellChain> carry_chains = find_chains(
ctx, [](const Context *ctx, const CellInfo *cell) { return is_lc(ctx, cell); },
[](const Context *ctx, const
CellInfo *cell) {
@ -172,18 +172,20 @@ class ChainConstrainer
net_driven_by(ctx, cell->ports.at(ctx->id("CIN")).net, is_lc, ctx->id("COUT"));
if (carry_prev != nullptr)
return carry_prev;
/*CellInfo *i3_prev = net_driven_by(ctx, cell->ports.at(ctx->id("I3")).net, is_lc,
ctx->id("COUT")); if (i3_prev != nullptr) return i3_prev;*/
CellInfo *i3_prev = net_driven_by(ctx, cell->ports.at(ctx->id("I3")).net, is_lc, ctx->id("COUT"));
if (i3_prev != nullptr)
return i3_prev;
return (CellInfo *)nullptr;
},
[](const Context *ctx, const CellInfo *cell) {
CellInfo *carry_next = net_only_drives(ctx, cell->ports.at(ctx->id("COUT")).net, is_lc,
ctx->id("CIN"), false);
CellInfo *carry_next =
net_only_drives(ctx, cell->ports.at(ctx->id("COUT")).net, is_lc, ctx->id("CIN"), false);
if (carry_next != nullptr)
return carry_next;
/*CellInfo *i3_next =
net_only_drives(ctx, cell->ports.at(ctx->id("COUT")).net, is_lc, ctx->id("I3"),
false); if (i3_next != nullptr) return i3_next;*/
CellInfo *i3_next =
net_only_drives(ctx, cell->ports.at(ctx->id("COUT")).net, is_lc, ctx->id("I3"), false);
if (i3_next != nullptr)
return i3_next;
return (CellInfo *)nullptr;
});
std::unordered_set<IdString> chained;