On Thu, May 26, 2016 at 10:52 AM, Kyrill Tkachov
wrote:
> Hi all,
>
> On arm we don't have a dedicated instruction that corresponds to a CTZ rtx
> but we synthesise it
> with an RBIT instruction followed by a CLZ. This is currently done at expand
> time.
> However, I'd like to push that step until
Ping.
https://gcc.gnu.org/ml/gcc-patches/2016-05/msg02078.html
Patches 1 and 3 have been approved.
Thanks,
Kyrill
On 26/05/16 10:52, Kyrill Tkachov wrote:
Hi all,
On arm we don't have a dedicated instruction that corresponds to a CTZ rtx but
we synthesise it
with an RBIT instruction followed
On Thu, 26 May 2016, Kyrill Tkachov wrote:
> the early RTL optimisers. This better expresses the semantics of the
> operation as a whole, since the RBIT operation is represented as an
> UNSPEC anyway and so will not see the benefits of combine,
This doesn't affect your patch, but I think it wo
Hi all,
On arm we don't have a dedicated instruction that corresponds to a CTZ rtx but
we synthesise it
with an RBIT instruction followed by a CLZ. This is currently done at expand
time.
However, I'd like to push that step until after reload and keep the CTZ rtx as
a single whole in
the early
