On 11/29/23 19:39, Joern Rennecke wrote:
On Wed, 29 Nov 2023 at 20:05, Joern Rennecke
<joern.renne...@embecosm.com> wrote:
I suspect it'd be more useful to add handling of LSHIFTRT and ASHIFTRT
. Some ports do
a lot of static shifting.
+ case SS_ASHIFT:
+ case US_ASHIFT:
+ if (!mask || XEXP (x, 1) == const0_rtx)
+ return 0;
P.S.: I just realize that this is a pasto: in the case of a const0_rtx
shift count,
we returning 0 will usually be wrong.
I've attached my current patch version.
I would strongly suggest we not start adding a lot of new capabilities
here, deferring such work until gcc-15. Our focus should be getting the
existing code working well and cleanly implemented.
Jeff
