Re: Optimize Arm64 crc32c implementation in Postgresql

Hi,

On 2018-03-06 02:44:35 +0800, Heikki Linnakangas wrote:
> On 02/03/18 06:42, Andres Freund wrote:
> > On 2018-03-02 11:37:52 +1300, Thomas Munro wrote:
> > > So... that stuff probably needs either a configure check for the
> > > getauxval function and/or those headers, or an OS check?
> > 
> > It'd probably be better to not rely on os specific headers, and instead
> > directly access the capabilities.
> 
> Anyone got an idea on how to do that? I googled around a bit, but couldn't
> find any examples.

Similar...


> * Use compiler intrinsics instead of inline assembly.

+many


> * I tested this on Linux, with gcc and clang, on an ARM64 virtual machine
> that I had available (not an emulator, but a VM on a shared ARM64 server).

Have you seen actual postgres performance benefits with the patch?

- Andres