Benchmark Methodology Notes:

Dell Precision 420 running RH 7.3 
No other users, no other user processes except X and windows manager.
Main loop increased from 1000 to 100000 iterations.
Each test run 3 times and averaged.

Time in seconds for control, 16-bit table, and split table, 
with percent increase.  "omit" == -fomit-frame-pointer, 
"unroll" == -funroll-all-loops.

		ctrl	2table	%inc	16bit	%inc

O0		10.862	11.044	1.7	10.884	.20
		10.855	11.040	1.7	10.875	.18
O1		6.669	6.810	2.1	6.700	.46
		6.660	6.805	2.2	6.700	.60
O2		6.561	6.707	2.2	6.650	1.36
		6.555	6.710	2.4	6.650	1.45
O3		5.780	5.876	1.7	5.800	.34
		5.780	5.875	1.6	5.800	.34
O3 omit		5.646	5.744	1.7	5.671	.44
		5.640	5.740	1.8	5.670	.53
O3 omit unroll	5.636	5.744	1.9	5.664	.50
		5.630	5.750	2.1	5.660	.53
O3 -g		5.772	5.875	1.8	5.799	.46
		5.770	5.865	1.6	5.795	.43
Os		6.600	6.735	2.0	6.649	.74
		6.590	6.730	2.1	6.650	.91