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-rw-r--r--passes/opt/opt_rmdff.cc6
1 files changed, 6 insertions, 0 deletions
diff --git a/passes/opt/opt_rmdff.cc b/passes/opt/opt_rmdff.cc
index a84bf437..9ce98004 100644
--- a/passes/opt/opt_rmdff.cc
+++ b/passes/opt/opt_rmdff.cc
@@ -92,6 +92,12 @@ static bool handle_dff(RTLIL::Module *mod, RTLIL::Cell *dff)
}
}
+ if (sig_d.is_fully_undef() && sig_d.width == int(val_rv.bits.size())) {
+ RTLIL::SigSig conn(sig_q, val_rv);
+ mod->connections.push_back(conn);
+ goto delete_dff;
+ }
+
if (sig_d.is_fully_const() && sig_r.width == 0) {
RTLIL::SigSig conn(sig_q, sig_d);
mod->connections.push_back(conn);