On 2016-03-29 13:24:40 -0400, Tom Lane wrote:
> Andres Freund <andres@anarazel.de> writes:
> > Dilip, could you test performance of reducing ppc's spinlock to 1 byte?
> > Cross-compiling suggest that doing so "just works". I.e. replace the
> > #if defined(__ppc__) typedef from an int to a char.
>
> AFAICS, lwarx/stwcx are specifically *word* wide.
Ah, x86 gcc is just too convenient, with it automatically adjusting
instruction types :(
There's actually lbarx/stbcx - but it's not present in all ISAs. So I
guess it's clear where to go.
Andres Freund