[PATCH] D76500: WIP: GlobalISel: Lower funnel shifts

Amara Emerson via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Tue Nov 3 11:16:37 PST 2020


aemerson added a comment.

In D76500#2301324 <https://reviews.llvm.org/D76500#2301324>, @arsenm wrote:

> In D76500#2301319 <https://reviews.llvm.org/D76500#2301319>, @aemerson wrote:
>
>> Is this still being worked on?
>
> Yes, I have an updated version I haven't posted yet. The problem I ended up blocked on was the fact that we don't have the divide-by-constant optimizations, combined with 128-bit division legalization not working

Anything we can help on? For the divide by constant opts, I guess this is: X / C -> ashr X, log2(C)? Anything else?


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