PING [PATCH] RX new builtin function

Oleg Endo oleg.endo@t-online.de
Tue Aug 11 02:16:21 GMT 2020


On Mon, 2020-08-10 at 13:51 +0300, Darius Galis wrote:
> 
> I've found the following patch 
> https://gcc.gnu.org/legacy-ml/gcc-patches/2018-11/msg00983.html, but it 
> is not in the latest sources.
> Could please let me know why it was not added? I'm willing to do any 
> rework necessary in order for it to be accepted to the latest sources.

I think it'd be better to fix and/or improve the backend code so that
the compiler generates the bset instruction automatically.  Otherwise
this built-in is not very useful for user code.  Except for the use
case of atomic-or on byte memory location, as a "side effect".  But
that should be implemented as such -- as atomics.

There are a couple of PRs that might be relevant/interesting

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93587
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83832
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81823

Cheers,
Oleg



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