[10] RFR: 8044829: UseAES warning message generation differs on CPU architecture

[Rahul Raghavan]

Hi,

Please review the following fix proposal.

<webrev.00> - http://cr.openjdk.java.net/~rraghavan/8044829/webrev.00/
    src/cpu/x86/vm/vm_version_x86.cpp   -   3 lines changed: 0 ins; 3 del; 0 mod; 1436 unchg
    src/cpu/x86/vm/assembler_x86.cpp    -   8 lines changed: 0 ins; 0 del; 8 mod; 8843 unchg 

No issues with jprt (-testset hotspot) testing.

Please refer <jbs> comments - https://bugs.openjdk.java.net/browse/JDK-8044829

1. Proposed fix changes in 'vm_version_x86.cpp' fixes the wrong warning generated for options -XX:-UseAES -XX:+UseAESIntrinsics.
      void VM_Version::get_processor_features() {
      .........
      -  if (!UseAES && !FLAG_IS_DEFAULT(UseAES))
      -    _features &= ~CPU_AES;
      -

.e.g.: wrong warning without fix for x64, WITH AES support - 
      Java HotSpot(TM) 64-Bit Server VM warning: AES intrinsics are not available on this CPU

.e.g.: correct warning with fix - (same as already fixed for sparc)
      Java HotSpot(TM) 64-Bit Server VM warning: AES intrinsics require UseAES flag to be enabled. Intrinsics will be disabled.

2. Seems additional changes as proposed maybe required in  'assembler_x86.cpp' after changes in 'vm_version_x86.cpp'.

3. Found issues reported earlier for sparc was solved with 8131778 fix in 9-b96.
Found no similar issues with other targets.


Thanks,
Rahul