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+# From https://github.com/cliffordwolf/icestorm/blob/be0bca0/icefuzz/timings_hx8k.txt
+
+# NB: Inputs/Outputs must be ordered alphabetically
+
+# Inputs: CI I0 I1
+# Outputs: CO
+SB_CARRY 1 1 3 1
+126 259 231
+
+# Inputs: I0 I1 I2 I3
+# Outputs: O
+SB_LUT4 2 1 4 1
+449 400 379 316