[PATCH] D150388: [CodeGen]Allow targets to use target specific COPY instructions for live range splitting

Mon Jul 17 16:52:39 PDT 2023

arsenm added a comment.

In D150388#4506932 <https://reviews.llvm.org/D150388#4506932>, @vitalybuka wrote:

> In D150388#4504387 <https://reviews.llvm.org/D150388#4504387>, @arsenm wrote:
>
>> In D150388#4504380 <https://reviews.llvm.org/D150388#4504380>, @vitalybuka wrote:
>>
>>> It's still regression. Unless someone has a patch ready to land, we need to revert this.
>>
>> I'd ask that you provide a reproducer, and perform the experiment I mentioned. If we can just disable the expanded isCopyInstr identification, it will be a lot less painful
>
> I am running creduce for ubsan case whole weekend, still quite large. I can try the experiment if you can provide a draft patch.

In D150388#4506932 <https://reviews.llvm.org/D150388#4506932>, @vitalybuka wrote:

> In D150388#4504387 <https://reviews.llvm.org/D150388#4504387>, @arsenm wrote:
>
>> In D150388#4504380 <https://reviews.llvm.org/D150388#4504380>, @vitalybuka wrote:
>>
>>> It's still regression. Unless someone has a patch ready to land, we need to revert this.
>>
>> I'd ask that you provide a reproducer, and perform the experiment I mentioned. If we can just disable the expanded isCopyInstr identification, it will be a lot less painful
>
> I am running creduce for ubsan case whole weekend, still quite large. I can try the experiment if you can provide a draft patch.

https://reviews.llvm.org/differential/diff/541268/ is the draft

There's something wrong elsewhere even if this fixes it, but I can't see what else would change anything

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D150388/new/

https://reviews.llvm.org/D150388