Re: spinlock support on loongarch64

Andres Freund <andres@anarazel.de> writes:
> On 2022-11-02 14:55:04 -0400, Tom Lane wrote:
>> After actually testing (by removing the ARM stanza on a macOS machine),
>> it seems that placement doesn't work, because of the default definition
>> of S_UNLOCK at the bottom of the "#if defined(__GNUC__)" stuff.  Putting
>> it inside that test works, and seems like it should be fine, since this
>> is a GCC-ism.

> Looks reasonable. I tested it on x86-64 by disabling that section and it
> works.

Thanks for looking.

> I wonder if it's worth keeing the full copy of this in the arm section? We
> could just define SPIN_DELAY() for aarch64?

I thought about that, but given the increasing popularity of ARM
I bet that that stanza is going to accrete more special-case knowledge
over time.  It's probably simplest to keep it separate.

            regards, tom lane