[PATCH] D104575: AMDGPU: Try to eliminate clearing of high bits of 16-bit instructions

[Jay Foad via Phabricator via llvm-commits]

foad added a comment.

In D104575#2833135 <https://reviews.llvm.org/D104575#2833135>, @arsenm wrote:

> In D104575#2832652 <https://reviews.llvm.org/D104575#2832652>, @foad wrote:
>
>> Looks reasonable to me. I guess there's no way to do this as a DAGCombine instead?
>
> You would need to know exactly how the source node is going to be selected, which you can't know ahead of time We do approximate this for FP instructions already.

I was wondering if combines could be run on the MachineSDNodes immediately after selection. But I see there is nothing like that.


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