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| author | gatecat <gatecat@ds0.me> | 2022-01-16 19:59:56 +0000 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-01-16 19:59:56 +0000 |
| commit | 58a1b473b85ae8bc4312eed14af1829b93958341 (patch) | |
| tree | 9dbefa931b0f102744fb538f91865ba949cad9be /ice40 | |
| parent | 2ab08a872d08e6ba64a0b81303889a14941a88f0 (diff) | |
| parent | a946ed0206cda29ce1bfe7f5a09f1b5e3d21794d (diff) | |
| download | nextpnr-58a1b473b85ae8bc4312eed14af1829b93958341.tar.gz nextpnr-58a1b473b85ae8bc4312eed14af1829b93958341.tar.bz2 nextpnr-58a1b473b85ae8bc4312eed14af1829b93958341.zip | |
Merge pull request #873 from YosysHQ/gatecat/ice40-carry-lut
ice40: Pack LUT at start of carry chain if there is 1 candidate
Diffstat (limited to 'ice40')
| -rw-r--r-- | ice40/pack.cc | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/ice40/pack.cc b/ice40/pack.cc index 0db78992..921e73e0 100644 --- a/ice40/pack.cc +++ b/ice40/pack.cc @@ -203,6 +203,8 @@ static void pack_carries(Context *ctx) CellInfo *carry_lc = nullptr; if (carry_ci_lc && carry_lcs.find(carry_ci_lc->name) != carry_lcs.end()) { carry_lc = carry_ci_lc; + } else if (ci_const && carry_lcs.size() == 1) { + carry_lc = ctx->cells.at(*(carry_lcs.begin())).get(); } else { // No LC to pack into matching I0/I1, insert a new one std::unique_ptr<CellInfo> created_lc = |