RFR: 8311220: Optimization for StringLatin UpperLower
温绍锦
duke at openjdk.org
Mon Jul 3 05:33:05 UTC 2023
On Mon, 3 Jul 2023 05:16:35 GMT, Jacob G. <duke at openjdk.org> wrote:
>> # Benchmark Result
>>
>>
>> sh make/devkit/createJMHBundle.sh
>> bash configure --with-jmh=build/jmh/jars
>> make test TEST="micro:java.lang.StringUpperLower.*"
>>
>>
>>
>> ## 1. [aliyun_ecs_c8i.xlarge](https://help.aliyun.com/document_detail/25378.html#c8i)
>> * cpu : intel xeon sapphire rapids (x64)
>>
>> ``` diff
>> -Benchmark Mode Cnt Score Error Units (baseline)
>> -StringUpperLower.lowerToLower avgt 15 27.180 ± 0.017 ns/op
>> -StringUpperLower.lowerToUpper avgt 15 47.196 ± 0.066 ns/op
>> -StringUpperLower.mixedToLower avgt 15 32.307 ± 0.072 ns/op
>> -StringUpperLower.mixedToUpper avgt 15 44.005 ± 0.414 ns/op
>> -StringUpperLower.upperToLower avgt 15 32.310 ± 0.033 ns/op
>> -StringUpperLower.upperToUpper avgt 15 42.053 ± 0.341 ns/op
>>
>> +Benchmark Mode Cnt Score Error Units
>> +StringUpperLower.lowerToLower avgt 15 16.976 ± 0.043 ns/op (+60.160)
>> +StringUpperLower.lowerToUpper avgt 15 46.373 ± 0.086 ns/op (+1.77%)
>> +StringUpperLower.mixedToLower avgt 15 32.018 ± 0.061 ns/op (+0.9%)
>> +StringUpperLower.mixedToUpper avgt 15 42.019 ± 0.473 ns/op (+4.72%)
>> +StringUpperLower.upperToLower avgt 15 32.052 ± 0.051 ns/op (+0.8%)
>> +StringUpperLower.upperToUpper avgt 15 16.978 ± 0.190 ns/op (+47.69%)
>>
>>
>> ## 2. [aliyun_ecs_c8a.xlarge](https://help.aliyun.com/document_detail/25378.html#c8a)
>> * cpu : amd epc genoa (x64)
>>
>> ``` diff
>> -Benchmark Mode Cnt Score Error Units (baseline)
>> -StringUpperLower.lowerToLower avgt 15 22.164 ± 0.021 ns/op
>> -StringUpperLower.lowerToUpper avgt 15 46.113 ± 0.047 ns/op
>> -StringUpperLower.mixedToLower avgt 15 28.501 ± 0.037 ns/op
>> -StringUpperLower.mixedToUpper avgt 15 38.782 ± 0.038 ns/op
>> -StringUpperLower.upperToLower avgt 15 28.625 ± 0.162 ns/op
>> -StringUpperLower.upperToUpper avgt 15 27.960 ± 0.038 ns/op
>>
>> +Benchmark Mode Cnt Score Error Units
>> +StringUpperLower.lowerToLower avgt 15 15.273 ± 0.012 ns/op (+45.18%)
>> +StringUpperLower.lowerToUpper avgt 15 46.939 ± 0.037 ns/op (-1.75%)
>> +StringUpperLower.mixedToLower avgt 15 27.978 ± 0.015 ns/op (+1.86%)
>> +StringUpperLower.mixedToUpper avgt 15 38.120 ± 0.047 ns/op (+1.73%)
>> +StringUpperLower.upperToLower avgt 15 27.994 ± 0.053 ns/op (+2.25%)
>> +StringUpperLower.upperToUpper avgt 15 17.405 ± 0.006 ns/op (+60.64%)
>>
>>
>>
>> ## 3. [aliyun_ecs_c8y.x...
>
> src/java.base/share/classes/java/lang/StringLatin1.java line 498:
>
>> 496: for (first = 0 ; first < len; first++ ) {
>> 497: int cp = value[first] & 0xff;
>> 498: if (cp >= 'a' && (cp <= 'z' || cp == 181 || (cp >= 223 && cp != 247))) {
>
> The following would be consistent with your other changes:
>
> if (CharacterDataLatin1.instance.isLowerCase(value[first] & 0xff)) {
When the value of cp is 170 or 186, the result of using isLowerCase is not expected, and it also cause build fail.
-------------
PR Review Comment: https://git.openjdk.org/jdk/pull/14751#discussion_r1250261151
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