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| author | Alessandro Comodi <acomodi@antmicro.com> | 2022-01-25 17:46:54 +0100 |
|---|---|---|
| committer | Alessandro Comodi <acomodi@antmicro.com> | 2022-02-01 11:18:17 +0100 |
| commit | 676e56e5d44e09f3ff816c5efbb85e2b2ac1086b (patch) | |
| tree | 69fa8a9aa9b7bbce4720486b403095d3fb832664 /nexus | |
| parent | e069b3bc6ab4d504e84ef62086d2bb9e5144717b (diff) | |
| download | nextpnr-676e56e5d44e09f3ff816c5efbb85e2b2ac1086b.tar.gz nextpnr-676e56e5d44e09f3ff816c5efbb85e2b2ac1086b.tar.bz2 nextpnr-676e56e5d44e09f3ff816c5efbb85e2b2ac1086b.zip | |
nexus: add option to modify the mult factor of the estimate delay
Signed-off-by: Alessandro Comodi <acomodi@antmicro.com>
Diffstat (limited to 'nexus')
| -rw-r--r-- | nexus/arch.cc | 7 | ||||
| -rw-r--r-- | nexus/arch.h | 1 | ||||
| -rw-r--r-- | nexus/main.cc | 4 |
3 files changed, 11 insertions, 1 deletions
diff --git a/nexus/arch.cc b/nexus/arch.cc index a7751425..06a901cd 100644 --- a/nexus/arch.cc +++ b/nexus/arch.cc @@ -601,7 +601,8 @@ delay_t Arch::estimateDelay(WireId src, WireId dst) const int dst_x = dst.tile % chip_info->width, dst_y = dst.tile / chip_info->width; int dist_x = std::abs(src_x - dst_x); int dist_y = std::abs(src_y - dst_y); - return 75 * dist_x + 75 * dist_y + 250; + + return estimate_delay_mult * (dist_x + dist_y) + 250; } delay_t Arch::predictDelay(BelId src_bel, IdString src_pin, BelId dst_bel, IdString dst_pin) const { @@ -655,6 +656,10 @@ ArcBounds Arch::getRouteBoundingBox(WireId src, WireId dst) const bool Arch::place() { + estimate_delay_mult = 75; + if (getCtx()->settings.count(getCtx()->id("estimate-delay-mult"))) + estimate_delay_mult = getCtx()->setting<int>("estimate-delay-mult"); + std::string placer = str_or_default(settings, id("placer"), defaultPlacer); if (placer == "heap") { diff --git a/nexus/arch.h b/nexus/arch.h index 0bd1b62c..ea4e9f5b 100644 --- a/nexus/arch.h +++ b/nexus/arch.h @@ -1290,6 +1290,7 @@ struct Arch : BaseArch<ArchRanges> // ------------------------------------------------- + int32_t estimate_delay_mult; delay_t estimateDelay(WireId src, WireId dst) 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; } diff --git a/nexus/main.cc b/nexus/main.cc index 9fec8d5e..b02dfa99 100644 --- a/nexus/main.cc +++ b/nexus/main.cc @@ -54,6 +54,8 @@ po::options_description NexusCommandHandler::getArchOptions() specific.add_options()("no-pack-lutff", "disable packing (clustering) LUTs and FFs together"); specific.add_options()("carry-lutff-ratio", po::value<float>(), "ratio of FFs to be added to carry-chain LUT clusters"); + specific.add_options()("estimate-delay-mult", po::value<int>(), + "multiplier for the estimate delay"); return specific; } @@ -88,6 +90,8 @@ std::unique_ptr<Context> NexusCommandHandler::createContext(dict<std::string, Pr } ctx->settings[ctx->id("carry_lutff_ratio")] = ratio; } + if (vm.count("estimate-delay-mult")) + ctx->settings[ctx->id("estimate-delay-mult")] = vm["estimate-delay-mult"].as<int>(); return ctx; } |