diff options
| author | gatecat <gatecat@ds0.me> | 2021-12-19 16:41:34 +0000 |
|---|---|---|
| committer | gatecat <gatecat@ds0.me> | 2021-12-19 17:15:15 +0000 |
| commit | ddb084e9a8a0cba10536951236cde824526e8071 (patch) | |
| tree | d03ba5688367cb476a06b19d04ca78d0352afce3 /ice40 | |
| parent | 56d550733346000584b9490fac0953fe07124035 (diff) | |
| download | nextpnr-ddb084e9a8a0cba10536951236cde824526e8071.tar.gz nextpnr-ddb084e9a8a0cba10536951236cde824526e8071.tar.bz2 nextpnr-ddb084e9a8a0cba10536951236cde824526e8071.zip | |
archapi: Use arbitrary rather than actual placement in predictDelay
This makes predictDelay be based on an arbitrary belpin pair rather
than a arc of a net based on cell placement. This way 'what-if'
decisions can be evaluated without actually changing placement;
potentially useful for parallel placement.
A new helper predictArcDelay behaves like the old predictDelay to
minimise the impact on existing passes; only arches need be updated.
Signed-off-by: gatecat <gatecat@ds0.me>
Diffstat (limited to 'ice40')
| -rw-r--r-- | ice40/arch.h | 2 | ||||
| -rw-r--r-- | ice40/delay.cc | 10 |
2 files changed, 6 insertions, 6 deletions
diff --git a/ice40/arch.h b/ice40/arch.h index 5162285c..3563baad 100644 --- a/ice40/arch.h +++ b/ice40/arch.h @@ -784,7 +784,7 @@ struct Arch : BaseArch<ArchRanges> // ------------------------------------------------- delay_t estimateDelay(WireId src, WireId dst) const override; - delay_t predictDelay(const NetInfo *net_info, const PortRef &sink) const override; + delay_t predictDelay(BelId src_bel, IdString src_pin, BelId dst_bel, IdString dst_pin) const override; delay_t getDelayEpsilon() const override { return 20; } delay_t getRipupDelayPenalty() const override { return 200; } float getDelayNS(delay_t v) const override { return v * 0.001; } diff --git a/ice40/delay.cc b/ice40/delay.cc index 740057f1..a00cc259 100644 --- a/ice40/delay.cc +++ b/ice40/delay.cc @@ -188,13 +188,13 @@ delay_t Arch::estimateDelay(WireId src, WireId dst) const return v; } -delay_t Arch::predictDelay(const NetInfo *net_info, const PortRef &sink) const +delay_t Arch::predictDelay(BelId src_bel, IdString src_pin, BelId dst_bel, IdString dst_pin) const { - const auto &driver = net_info->driver; - auto driver_loc = getBelLocation(driver.cell->bel); - auto sink_loc = getBelLocation(sink.cell->bel); + NPNR_UNUSED(dst_pin); + auto driver_loc = getBelLocation(src_bel); + auto sink_loc = getBelLocation(dst_bel); - if (driver.port == id_COUT) { + if (src_pin == id_COUT) { if (driver_loc.y == sink_loc.y) return 0; return 250; |