RFR: 8139457: Array bases are aligned at HeapWord granularity [v19]

[Roman Kennke]

On Mon, 13 Feb 2023 16:15:56 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove stale method
>
> test/hotspot/jtreg/runtime/FieldLayout/ArrayBaseOffsets.java line 110:
> 
>> 108:         Asserts.assertEquals(unsafe.arrayBaseOffset(float[].class),   intOffset,  "Misplaced float   array base");
>> 109:         Asserts.assertEquals(unsafe.arrayBaseOffset(double[].class),  longOffset, "Misplaced double  array base");
>> 110:         int expectedObjArrayOffset = (COOP || !Platform.is64bit()) ? intOffset : longOffset;
> 
> `|| !Platform.is64Bit()` looks redundant, since `COOP` is guaranteed to be false on 32-bit?

No, because on 32 bit this expression becomes true, which is what we want - the small (int) offset for reference arrays.

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PR: https://git.openjdk.org/jdk/pull/11044