diff options
| -rw-r--r-- | fpga_interchange/site_router.cc | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/fpga_interchange/site_router.cc b/fpga_interchange/site_router.cc index 92176d86..f209bd8c 100644 --- a/fpga_interchange/site_router.cc +++ b/fpga_interchange/site_router.cc @@ -862,6 +862,8 @@ static void apply_constant_routing(Context *ctx, const SiteArch &site_arch, NetI SiteWire wire = user; PipId inverting_pip; + PhysicalNetlist::PhysNetlist::NetType pref_const = PhysicalNetlist::PhysNetlist::NetType::SIGNAL; + while (wire != site_net->driver) { SitePip pip = site_net->wires.at(wire).pip; NPNR_ASSERT(site_arch.getPipDstWire(pip) == wire); @@ -884,9 +886,16 @@ static void apply_constant_routing(Context *ctx, const SiteArch &site_arch, NetI } wire = site_arch.getPipSrcWire(pip); + pref_const = site_arch.prefered_constant_net_type(pip); } - if (!is_path_inverting && !path_can_invert) { + bool is_pref_const = true; + if (pref_const == PhysicalNetlist::PhysNetlist::NetType::VCC && net == gnd_net) + is_pref_const = false; + else if (pref_const == PhysicalNetlist::PhysNetlist::NetType::GND && net == vcc_net) + is_pref_const = false; + + if (!is_path_inverting && (!path_can_invert || is_pref_const)) { // This routing is boring, use base logic. apply_simple_routing(ctx, site_arch, net, site_net, user); continue; |