RFR: 8308076: X86_64: make rheapbase register allocatable in zero based compressedOops mode [v3]
kuaiwei
duke at openjdk.org
Tue May 16 05:57:12 UTC 2023
On Mon, 15 May 2023 09:13:57 GMT, kuaiwei <duke at openjdk.org> wrote:
>> In x86 64 mode, decode heap oop could use SIB without base if heap base is zero. like
>>
>> 0d1 movl R11, [,R9 << 3 + #72] (zero base compressed oop addressing) # compressed ptr ! Field: java/lang/ClassLoader.classAssertionStatus
>>
>> So rheapbase( r12 ) can be allocated as general register.
>>
>> Tier 1/2 tests are passed without new failure.
>
> kuaiwei has updated the pull request incrementally with one additional commit since the last revision:
>
> fix zero build
>
Thanks for the comments. reinit_heapbase is fixed.
-------------
PR Comment: https://git.openjdk.org/jdk/pull/13976#issuecomment-1549031325
More information about the hotspot-dev
mailing list