RFR: 8256267: Relax compiler/floatingpoint/NaNTest.java for x86_32 and lower -XX:+UseSSE [v3]

[Vladimir Kozlov]

On Tue, 24 Nov 2020 09:35:12 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Reproduces like this:
>> 
>> $ CONF=linux-x86-server-fastdebug make images run-test TEST=compiler/floatingpoint/NaNTest.java TEST_VM_OPTS="-XX:UseSSE=1"
>> 
>> STDOUT:
>> ### NanTest started
>> Written and read back float values match
>> 0x7F800001 0x7F800001
>> STDERR:
>> java.lang.RuntimeException: Original and read back double values mismatch
>> 0xFFF0000000000001 0xFFF8000000000001
>> 
>> at compiler.floatingpoint.NaNTest.testDouble(NaNTest.java:56)
>> at compiler.floatingpoint.NaNTest.main(NaNTest.java:69)
>> 
>> After reading through [JDK-8076373](https://bugs.openjdk.java.net/browse/JDK-8076373), I think the test cannot be expected to pass without SSE >= 2 for doubles, and SSE >= 1 for floats on x86_32. This change adds the platform and UseSSE sensing to test.
>> 
>> Additional testing:
>>  - [x] Affected test on Linux x86_32 with `-XX:UseSSE={0,1,2}`
>>  - [x] Affected test on Linux x86_64 with `-XX:UseSSE={0,1,2}`
>>  - [x] Affected test on Linux AArch64
>
> Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Do not run the tests when it is known to fail, even for messages

Good.

-------------

Marked as reviewed by kvn (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1187