caiyu/nextpnr
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Merge pull request #264 from smunaut/fix_sb_unused_in

Browse Source 
ice40/pack: During IO packing, remove any unused input connection
This commit is contained in:
David Shah 2019-04-11 13:32:01 +01:00 committed by GitHub
commit db7e850ee8
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 13 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
ice40/pack.cc
View File

@ -502,6 +502,19 @@ static void pack_io(Context *ctx)
// Make it a normal SB_IO with global marker
ci->type = ctx->id("SB_IO");
ci->attrs[ctx->id("GLOBAL")] = "1";
} else if (is_sb_io(ctx, ci)) {
// Disconnect unused inputs
NetInfo *net_in0 = ci->ports.count(id_D_IN_0) ? ci->ports[id_D_IN_0].net : nullptr;
NetInfo *net_in1 = ci->ports.count(id_D_IN_1) ? ci->ports[id_D_IN_1].net : nullptr;
if (net_in0 != nullptr && net_in0->users.size() == 0) {
delete_nets.insert(net_in0->name);
ci->ports[id_D_IN_0].net = nullptr;
}
if (net_in1 != nullptr && net_in1->users.size() == 0) {
delete_nets.insert(net_in1->name);
ci->ports[id_D_IN_1].net = nullptr;
}
}
}
for (auto pcell : packed_cells) {