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-rw-r--r--techlibs/common/synth.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/techlibs/common/synth.cc b/techlibs/common/synth.cc
index 513702357..d6dffdd7f 100644
--- a/techlibs/common/synth.cc
+++ b/techlibs/common/synth.cc
@@ -226,7 +226,7 @@ struct SynthPass : public ScriptPass
run("opt_clean");
if (help_mode)
run("techmap -map +/cmp2lut.v -map +/cmp2lcu.v", " (if -lut)");
- else
+ else if (lut)
run(stringf("techmap -map +/cmp2lut.v -map +/cmp2lcu.v -D LUT_WIDTH=%d", lut));
if (!noalumacc)
run("alumacc", " (unless -noalumacc)");