RFR: 8345355: [s390x] support for z16 hardware [v2]

[Amit Kumar]

On Wed, 4 Dec 2024 04:30:47 GMT, Amit Kumar <amitkumar at openjdk.org> wrote:

>> This was the output for `jdk/bin/java -XX:+Verbose --version` command on a z16 hardware: 
>> 
>> 
>> CPU Version as detected internally: system-z, g9-z15, ldisp_fast, extimm, pcrel_load/store, cmpb, cond_load/store, interlocked_update, txm, vectorinstr, instrext2, venh1, instrext3, venh2, out-of-support_as_of_tbd, aes128, aes192, aes256, sha1, sha256, sha512, ghash
>> 
>> 
>> So the issue is that z16 should be recognized as g10-z16 but instead I got g9-z15. 
>> 
>> This is the output with current changes: 
>> 
>> 
>> CPU Version as detected internally: system-z, g10-z16, ldisp_fast, extimm, pcrel_load/store, cmpb, cond_load/store, interlocked_update, txm, vectorinstr, instrext2, venh1, instrext3, venh2,bear_enh, sort_enh, nnpa_assist, storage_key_removal, vpack_decimal_enh, out-of-support_as_of_tbd, aes128, aes192, aes256, sha1, sha256, sha512, ghash
>
> Amit Kumar has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Correct NNP Assist Facility Mask

src/hotspot/cpu/s390/vm_version_s390.hpp line 93:

> 91: 
> 92: #define BEAREnhFacilityMask             0x4000000000000000UL  // z16, BEAR-enhancement facility, Bit: 193
> 93: #define NNPAssistFacilityMask           0x0000000000040000UL  // z16, Neural-network-processing-assist facility, Bit: 165

[My script](https://github.com/offamitkumar/s390xFacilityMask) says that this should be 
Suggestion:

#define NNPAssistFacilityMask           0x0000000004000000UL  // z16, Neural-network-processing-assist facility, Bit: 165



Enter Facility Bit Number: 165
_feature array index: 2
bit position to set: 37
bit string: 0000000000000000000000000000000000000100000000000000000000000000
Mask:  0x0000000004000000UL

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

PR Review Comment: https://git.openjdk.org/jdk/pull/22508#discussion_r1868702977