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-rw-r--r--techlibs/ice40/synth_ice40.cc4
1 files changed, 2 insertions, 2 deletions
diff --git a/techlibs/ice40/synth_ice40.cc b/techlibs/ice40/synth_ice40.cc
index 7094db50d..cc4627cd3 100644
--- a/techlibs/ice40/synth_ice40.cc
+++ b/techlibs/ice40/synth_ice40.cc
@@ -268,8 +268,8 @@ struct SynthIce40Pass : public ScriptPass
run("abc -lut 4");
run("clean");
if (relut || help_mode) {
- run("ice40_unlut", "(only if -relut)");
- run("opt_lut", " (only if -relut)");
+ run("ice40_unlut", " (only if -relut)");
+ run("opt_lut -dlogic SB_CARRY:I0=1:I1=2:CI=3", "(only if -relut)");
}
}