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

Mon Jul 24 13:18:36 PDT 2023

arsenm added a comment.

In D150388#4529445 <https://reviews.llvm.org/D150388#4529445>, @arsenm wrote:

> In D150388#4529268 <https://reviews.llvm.org/D150388#4529268>, @vitalybuka wrote:
>
>> So if we have not fix, just discussion, should we revert? Even if it's preexisted unknown bug, I don't think it's appropriate to keep regression in existing functionality, for sake of fixing previously broken or missing functionally. 
>> Is it possible to workaround/revert some change with "if (x86) do old way" ?
>
> Try https://reviews.llvm.org/D156164 as a workaround. The high-bits-must-be-zero invariant disappears somewhere in the coalescer, this just hacks the resulting broken mov such that it hides the problem as it was before

Much better, probably real fix incoming

Repository:
  rG LLVM Github Monorepo

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

https://reviews.llvm.org/D150388