RFR: 8323497: On x64, use 32-bit immediate moves for narrow klass base if possible [v6]

[Thomas Stuefe]

On Thu, 22 May 2025 16:56:39 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fix COH
>
> test/hotspot/jtreg/runtime/CompressedOops/CompressedCPUSpecificClassSpaceReservation.java line 103:
> 
>> 101:             if (CDS) {
>> 102:                 // We always try to allocate below 4 GB.
>> 103:                 output.shouldContain("reserve_between (range [0x0000000000000000-0x0000000100000000)");
> 
> OK, but `!CDS` case, should we do the same?

True, I corrected that.

note that this test does not run under COH yet. When I find time, I'll broaden it to also test COH.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17340#discussion_r2104060519