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

Mon Jul 24 12:41:47 PDT 2023

arsenm added a comment.

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

Repository:
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  https://reviews.llvm.org/D150388/new/

https://reviews.llvm.org/D150388