Re: spinlock support on loongarch64

On 2022-11-02 17:37:04 -0400, Tom Lane wrote:
> 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.

WFM.