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| author | gatecat <gatecat@ds0.me> | 2021-10-11 20:12:08 +0100 |
|---|---|---|
| committer | gatecat <gatecat@ds0.me> | 2021-10-11 20:12:56 +0100 |
| commit | 15c10796bdf6d99d440d31f98dea3daca195a57d (patch) | |
| tree | 73699027a87fe04436412e07aa9cb5505e26df33 | |
| parent | dd2c5942a4c261fc26b16e19280490a2860020fa (diff) | |
| download | nextpnr-15c10796bdf6d99d440d31f98dea3daca195a57d.tar.gz nextpnr-15c10796bdf6d99d440d31f98dea3daca195a57d.tar.bz2 nextpnr-15c10796bdf6d99d440d31f98dea3daca195a57d.zip | |
mistral: Fix MLAB clustering
Signed-off-by: gatecat <gatecat@ds0.me>
| -rw-r--r-- | mistral/lab.cc | 6 | ||||
| -rw-r--r-- | mistral/pack.cc | 5 |
2 files changed, 9 insertions, 2 deletions
diff --git a/mistral/lab.cc b/mistral/lab.cc index e78a815c..4f6b9b00 100644 --- a/mistral/lab.cc +++ b/mistral/lab.cc @@ -492,6 +492,12 @@ void Arch::update_alm_input_count(uint32_t lab, uint8_t alm) for (int i = 0; i < 2; i++) { if (!luts[i]) continue; + // MLAB that has been clustered with other MLABs (due to shared read port) costs no extra inputs + if (luts[i]->combInfo.mlab_group != -1 && luts[i]->constr_z > 2) { + alm_data.unique_input_count = 0; + return; + } + total_lut_inputs += luts[i]->combInfo.used_lut_input_count - luts[i]->combInfo.chain_shared_input_count; } int shared_lut_inputs = 0; diff --git a/mistral/pack.cc b/mistral/pack.cc index ef3b3887..4b434015 100644 --- a/mistral/pack.cc +++ b/mistral/pack.cc @@ -367,8 +367,9 @@ struct MistralPacker CellInfo *ci = group.at(i); CellInfo *base = group.at((i / cluster_size) * cluster_size); int cell_index = int(i) % cluster_size; - int alm = i / 2; - int alm_cell = i % 2; + int alm = cell_index / 2; + int alm_cell = cell_index % 2; + ci->cluster = base->name; ci->constr_abs_z = true; ci->constr_z = alm * 6 + alm_cell; if (cell_index != 0) { |