[9] RFR(S): 8130120: Handling of SHA intrinsics inconsistent across platforms

[Zoltán Majó]

Hi,


please review the patch for JDK-8130120.

Bug: https://bugs.openjdk.java.net/browse/JDK-8130120

Problem: Currently, the JVM prints different warning messages when 
SHA-based intrinsics are attempted to be enabled (e.g., aarch64 prints 
"SHA intrinsics are not available on this CPU" and x86 prints "SHA 
instructions are not available on this CPU"). Also, there are flag 
combinations that result in a warning on some platforms but not on other 
platforms (e.g., -XX:-UseSHA -XX:+UseSHA1Intrinsics prints a warning on 
x86 but it does not on aarch64 and on sparc).

Solution: Change the handling of the UseSHA, UseSHA1Intrinsics, 
UseSHA256Intrinsics, and UseSHA512Intrinsics flags to work the same way 
on x86, aarch64, and sparc. Change warning messages to be consistent 
among the previously mentioned platforms and also to better match the 
flag's description. Update the tests in test/compiler/intrinsics/sha to 
match the new functionality.

Webrev: http://cr.openjdk.java.net/~zmajo/8130120/webrev.00/

Testing:
- full JPRT run (includes the updated tests that were executed on x86 
and sparc), all tests pass;
- locally executed the test/compiler/intrinsics/sha tests on aarch64; 
all tests pass.

Thank you and best regards,


Zoltan