RFR: 8285868: x86_64 intrinsics for floating point methods isNaN, isFinite and isInfinite [v6]

[Jatin Bhateja]

On Wed, 18 May 2022 06:57:38 GMT, Srinivas Vamsi Parasa <duke at openjdk.java.net> wrote:

>> test/micro/org/openjdk/bench/java/lang/DoubleClassCheck.java line 70:
>> 
>>> 68:     public void testIsFinite() {
>>> 69:         for (int i = 0; i < BUFFER_SIZE; i++) {
>>> 70:             outputs[i] = Double.isFinite(inputs[i]) ? false : true;
>> 
>> Any specific reason to explicitly add conditional check to return true/false when isFinite returns bool value ?
>
> Initially, it was returning a boolean value and storing it in the output buffer. Vladimir suggested that the realword usecase of these methods is in conditions. Hence, the benchmarks were modified.

Yes, that makes sense, but being a micro benchmark we micro focusing on perf gain due to this particular API, may be you can have one stand alone case also.

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PR: https://git.openjdk.java.net/jdk/pull/8459