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-rw-r--r--ice40/chains.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/ice40/chains.cc b/ice40/chains.cc
index b8fbee0f..3ef367f1 100644
--- a/ice40/chains.cc
+++ b/ice40/chains.cc
@@ -62,7 +62,7 @@ class ChainConstrainer
bool split_chain = (!ctx->logicCellsCompatible(tile.data(), tile.size())) ||
(int(chains.back().cells.size()) > max_length);
if (split_chain) {
- CellInfo *passout = make_carry_pass_out(cell->ports.at(ctx->id("COUT")));
+ CellInfo *passout = make_carry_pass_out((*(curr_cell - 1))->ports.at(ctx->id("COUT")));
tile.pop_back();
chains.back().cells.back() = passout;
start_of_chain = true;