Rewrite of EUC_TW

[Xueming Shen]

Ulf Zibis wrote:
>
>>
>> Hope this is really a final one:-) the performance data looks good 
>> enough for me, yesterday and today's tweak
>> seems to be helpful, thanks Ulf!
>
> Could you share the new performance data ?
>
I simply ran the test case TestEUC_TW attached in the test case, set the 
iteration set to 200, run with
BMP characters only, supplementary characters only and mixed.

http://cr.openjdk.java.net/~sherman/6831794_6229811/webrev/test/sun/nio/cs/TestEUC_TW.java.html

Though this is not a real benchmark, the data does say something.

BMP -client:
    Encoding TimeRatio EUC_TW_OLD/x-EUC-TW: 14178,3350 :4.232239
    Decoding TimeRatio EUC_TW_OLD/x-EUC-TW: 5061,3538 :1.430469
    Encoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 17917,7431 :2.411116
    Decoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 7966,6859 :1.161394

SUPP -client
    Encoding TimeRatio EUC_TW_OLD/x-EUC-TW: 72054,7165 :10.056385
    Decoding TimeRatio EUC_TW_OLD/x-EUC-TW: 7912,5550 :1.425586
    Encoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 78578,12924 :6.080006
    Decoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 13198,11483 :1.149351

Mixed -client
    Encoding TimeRatio EUC_TW_OLD/x-EUC-TW: 73012,7499 :9.736231
    Decoding TimeRatio EUC_TW_OLD/x-EUC-TW: 7952,5549 :1.433051
    Encoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 77963,13116 :5.944114
    Decoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 13139,11727 :1.120406

BMP -server:
    Encoding TimeRatio EUC_TW_OLD/x-EUC-TW: 13164,3479 :3.783846
    Decoding TimeRatio EUC_TW_OLD/x-EUC-TW: 4703,2304 :2.041233
    Encoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 13758,3572 :3.851624
    Decoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 5370,3421 :1.569716

SUPP -server
    Encoding TimeRatio EUC_TW_OLD/x-EUC-TW: 67307,5540 :12.149278
    Decoding TimeRatio EUC_TW_OLD/x-EUC-TW: 5825,4434 :1.313712
    Encoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 68738,5710 :12.038179
    Decoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 5980,4104 :1.457115

Mixed -server
    Encoding TimeRatio EUC_TW_OLD/x-EUC-TW: 67568,5465 :12.363769
    Decoding TimeRatio EUC_TW_OLD/x-EUC-TW: 6323,4421 :1.430219
    Encoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 68766,5767 :11.924051
    Decoding(dir) TimeRatio EUC_TW_OLD/x-EUC-TW: 5637,4040 :1.395297