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Add vcc and gnd nets and cells only if needed

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This commit is contained in:
Miodrag Milanovic 2019-06-07 13:58:21 +02:00
parent 78e6631f76
commit 07b21c5129
1 changed files with 20 additions and 5 deletions
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21
ice40/pack.cc
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@ -341,6 +341,12 @@ static void pack_constants(Context *ctx)
gnd_net->driver.port = ctx->id("O");
gnd_cell->ports.at(ctx->id("O")).net = gnd_net.get();
NetInfo* gnd_net_info = gnd_net.get();
if (ctx->nets.find(ctx->id("$PACKER_GND_NET"))!=ctx->nets.end())
{
gnd_net_info = ctx->nets.find(ctx->id("$PACKER_GND_NET"))->second.get();
}
std::unique_ptr<CellInfo> vcc_cell = create_ice_cell(ctx, ctx->id("ICESTORM_LC"), "$PACKER_VCC");
vcc_cell->params[ctx->id("LUT_INIT")] = "1";
std::unique_ptr<NetInfo> vcc_net = std::unique_ptr<NetInfo>(new NetInfo);
@ -349,6 +355,12 @@ static void pack_constants(Context *ctx)
vcc_net->driver.port = ctx->id("O");
vcc_cell->ports.at(ctx->id("O")).net = vcc_net.get();
NetInfo* vcc_net_info = vcc_net.get();
if (ctx->nets.find(ctx->id("$PACKER_VCC_NET"))!=ctx->nets.end())
{
vcc_net_info = ctx->nets.find(ctx->id("$PACKER_VCC_NET"))->second.get();
}
std::vector<IdString> dead_nets;
bool gnd_used = false;
@ -357,26 +369,29 @@ static void pack_constants(Context *ctx)
NetInfo *ni = net.second;
if (ni->driver.cell != nullptr && ni->driver.cell->type == ctx->id("GND")) {
IdString drv_cell = ni->driver.cell->name;
set_net_constant(ctx, ni, gnd_net.get(), false);
set_net_constant(ctx, ni, gnd_net_info, false);
gnd_used = true;
dead_nets.push_back(net.first);
ctx->cells.erase(drv_cell);
} 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);
set_net_constant(ctx, ni, vcc_net_info, true);
dead_nets.push_back(net.first);
ctx->cells.erase(drv_cell);
}
}
if (gnd_used) {
if (gnd_used && (gnd_net_info == gnd_net.get())) {
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_net_info == vcc_net.get())
{
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);