diff options
Diffstat (limited to 'common/context.cc')
| -rw-r--r-- | common/context.cc | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/common/context.cc b/common/context.cc index 6bba5cbe..faddf825 100644 --- a/common/context.cc +++ b/common/context.cc @@ -90,6 +90,25 @@ WireId Context::getNetinfoSinkWire(const NetInfo *net_info, const PortRef &sink, return WireId(); } +delay_t Context::predictArcDelay(const NetInfo *net_info, const PortRef &sink) const +{ + if (net_info->driver.cell == nullptr || net_info->driver.cell->bel == BelId() || sink.cell->bel == BelId()) + return 0; + IdString driver_pin, sink_pin; + // Pick the first pin for a prediction; assume all will be similar enouhg + for (auto pin : getBelPinsForCellPin(net_info->driver.cell, net_info->driver.port)) { + driver_pin = pin; + break; + } + for (auto pin : getBelPinsForCellPin(sink.cell, sink.port)) { + sink_pin = pin; + break; + } + if (driver_pin == IdString() || sink_pin == IdString()) + return 0; + return predictDelay(net_info->driver.cell->bel, driver_pin, sink.cell->bel, sink_pin); +} + delay_t Context::getNetinfoRouteDelay(const NetInfo *net_info, const PortRef &user_info) const { #ifdef ARCH_ECP5 @@ -98,7 +117,7 @@ delay_t Context::getNetinfoRouteDelay(const NetInfo *net_info, const PortRef &us #endif if (net_info->wires.empty()) - return predictDelay(net_info, user_info); + return predictArcDelay(net_info, user_info); WireId src_wire = getNetinfoSourceWire(net_info); if (src_wire == WireId()) @@ -128,7 +147,7 @@ delay_t Context::getNetinfoRouteDelay(const NetInfo *net_info, const PortRef &us if (cursor == src_wire) max_delay = std::max(max_delay, delay + getWireDelay(src_wire).maxDelay()); // routed else - max_delay = std::max(max_delay, predictDelay(net_info, user_info)); // unrouted + max_delay = std::max(max_delay, predictArcDelay(net_info, user_info)); // unrouted } return max_delay; } |