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Do not add VCC if not used, loading json works

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This commit is contained in:
Miodrag Milanovic 2019-05-31 13:38:18 +02:00
parent 1657479c81
commit f1b3a14bc2
1 changed files with 6 additions and 5 deletions
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7
ice40/pack.cc
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@ -352,6 +352,7 @@ static void pack_constants(Context *ctx)
std::vector<IdString> dead_nets;
bool gnd_used = false;
bool vcc_used = false;
for (auto net : sorted(ctx->nets)) {
NetInfo *ni = net.second;
@ -364,6 +365,7 @@ static void pack_constants(Context *ctx)
} else if (ni->driver.cell != nullptr && ni->driver.cell->type == ctx->id("VCC")) {
IdString drv_cell = ni->driver.cell->name;
set_net_constant(ctx, ni, vcc_net.get(), true);
vcc_used = true;
dead_nets.push_back(net.first);
ctx->cells.erase(drv_cell);
}
@ -373,11 +375,10 @@ static void pack_constants(Context *ctx)
ctx->cells[gnd_cell->name] = std::move(gnd_cell);
ctx->nets[gnd_net->name] = std::move(gnd_net);
}
// Vcc cell always inserted for now, as it may be needed during carry legalisation (TODO: trim later if actually
// never used?)
if (vcc_used) {
ctx->cells[vcc_cell->name] = std::move(vcc_cell);
ctx->nets[vcc_net->name] = std::move(vcc_net);
}
for (auto dn : dead_nets) {
ctx->nets.erase(dn);
}