On Wed, 22 Jan 2025 16:45:39 GMT, Quan Anh Mai <qa...@openjdk.org> wrote:
>> test/micro/org/openjdk/bench/java/lang/foreign/AllocTest.java line 77:
>>
>>> 75: var freeAddr = lookup.findOrThrow("free");
>>> 76: CALLOC = linker.downcallHandle(callocAddr,
>>> FunctionDescriptor.of(ValueLayout.JAVA_LONG, ValueLayout.JAVA_LONG,
>>> ValueLayout.JAVA_LONG));
>>> 77: FREE = linker.downcallHandle(freeAddr,
>>> FunctionDescriptor.ofVoid(ValueLayout.JAVA_LONG));
>>
>> I'm not sure these changes are needed. It seems the main goal here is to
>> avoid the cost of the capture associated with `CLayouts::freeMemory` ? If
>> so, can't we just store that consumer into a static final and call it a day?
>> I think then we could avoid the `static` init, and leave most of the code
>> unchanged, except for the additional static field?
>
> The main goal here is that passing/receiving raw addresses as longs is
> cheaper than as `MemorySegment`s.
But the address is immediately converted to memory segment using
MemorySegment::ofAddress, which is what the linker does anyway?
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PR Review Comment: https://git.openjdk.org/jdk/pull/22610#discussion_r1928571827
