synth_lattice: Optimize flip-flop memories better

After `memory_map` maps memories to flip-flops we need to let `opt` remove undef muxes, otherwise we block enable/reset signal inference by `opt_dff` which is in detriment to QoR.
YosysHQ · Nov 7, 2023 · fed2720 · fed2720
1 parent ee3a4ce
commit fed2720
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/techlibs/lattice/synth_lattice.cc b/techlibs/lattice/synth_lattice.cc
@@ -373,7 +373,7 @@ struct SynthLatticePass : public ScriptPass
 		{
 			run("opt -fast -mux_undef -undriven -fine");
 			run("memory_map");
-			run("opt -undriven -fine");
+			run("opt -undriven -fine -mux_undef");
 		}
 
 		if (check_label("map_gates"))