RFR: Load coops base shift from AOTRuntimeConstants in AOT code [v2]

[Vladimir Kozlov]

On Thu, 12 Sep 2024 20:26:23 GMT, Ashutosh Mehra <asmehra at openjdk.org> wrote:

>> src/hotspot/cpu/aarch64/aarch64.ad line 5175:
>> 
>>> 5173: operand indirectN(iRegN reg)
>>> 5174: %{
>>> 5175:   predicate(CompressedOops::shift() == 0 && !SCCache::is_on_for_write());
>> 
>> Does it imply that with SCC is on_write we will not have the shift == 0?
>
> No, this is to prevent the match when compiling AOT code. We don't want to generate any AOT code which depends on shift == 0 as it may change during runtime.

Okay.

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PR Review Comment: https://git.openjdk.org/leyden/pull/20#discussion_r1757563343