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ecp5: Implement budget overrides for carry chains and SLICE muxes

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2019-01-08 13:06:02 +00:00
parent af3ff143be
commit f5b11ce075
1 changed files with 12 additions and 2 deletions
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14
ecp5/arch.cc
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@ -454,14 +454,24 @@ delay_t Arch::estimateDelay(WireId src, WireId dst) const
delay_t Arch::predictDelay(const NetInfo *net_info, const PortRef &sink) const
{
const auto &driver = net_info->driver;
if (driver.port == id_FCO && sink.port == id_FCI)
if ((driver.port == id_FCO && sink.port == id_FCI) || sink.port == id_FXA || sink.port == id_FXB)
return 0;
auto driver_loc = getBelLocation(driver.cell->bel);
auto sink_loc = getBelLocation(sink.cell->bel);
return (110 - 10 * args.speed) + (200 - 20 * args.speed) * (abs(driver_loc.x - sink_loc.x) + abs(driver_loc.y - sink_loc.y));
}
bool Arch::getBudgetOverride(const NetInfo *net_info, const PortRef &sink, delay_t &budget) const { return false; }
bool Arch::getBudgetOverride(const NetInfo *net_info, const PortRef &sink, delay_t &budget) const {
if (net_info->driver.port == id_FCO && sink.port == id_FCI) {
return true;
budget = 0;
} else if (sink.port == id_FXA || sink.port == id_FXB) {
return true;
budget = 0;
} else {
return false;
}
}
// -----------------------------------------------------------------------