bitcnts是mibench众多测试软件中的一个,但足够测试CPU的性能.如果需要全部测试软件，请从密西根大学网站上下载：http://www.eecs.umich.edu/mibench/
下面贴上SEP4020+Linux2.6上跑1000000位测试时间
测试环境CPU88MHz 开LCD NFS网络文件系统
/mibench/bitcount # ./bitcnts.arm 1000000
Bit counter algorithm benchmark
Optimized 1 bit/loop counter > Time: 1.880 sec.; Bits: 16574990
Ratko's mystery algorithm > Time: 0.980 sec.; Bits: 15358803
Recursive bit count by nybbles > Time: 4.130 sec.; Bits: 15309077
Non-recursive bit count by nybbles > Time: 1.070 sec.; Bits: 16253383
Non-recursive bit count by bytes (BW) > Time: 0.770 sec.; Bits: 16617466
Non-recursive bit count by bytes (AR) > Time: 0.980 sec.; Bits: 15233906
Shift and count bits> Time: 6.000 sec.; Bits: 15691122
Best > Non-recursive bit count by bytes (BW)
Worst > Shift and count bits
1000000位的测试就慢了很多
/mibench/bitcount # ./bitcnts.arm 10000000
Bit counter algorithm benchmark
Optimized 1 bit/loop counter > Time: 18.620 sec.; Bits: 164838829
Ratko's mystery algorithm > Time: 9.740 sec.; Bits: 158063216
Recursive bit count by nybbles > Time: 41.150 sec.; Bits: 160571544
Non-recursive bit count by nybbles > Time: 10.630 sec.; Bits: 162707129
Non-recursive bit count by bytes (BW) > Time: 7.640 sec.; Bits: 170893188
Non-recursive bit count by bytes (AR) > Time: 9.790 sec.; Bits: 154106854
Shift and count bits> Time: 59.870 sec.; Bits: 154959757
Best > Non-recursive bit count by bytes (BW)
Worst > Shift and count bits
/mibench/bitcount #
有时间测试2410的。
落鹤生：我要有时间也要好好测试一下目前这个i.mx27的板子上的v2ip程序，呵呵。
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