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

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

In D150388#4528824 <https://reviews.llvm.org/D150388#4528824>, @vitalybuka wrote:

> @yassingh @arsenm
> The major target is broken for too long, we need either fix or revert, even if it's a chain of patches.

I just posted about this issue:
https://discourse.llvm.org/t/subreg-to-reg-semantics-or-x86s-zext-implementation-is-broken/72250

Either x86 is broken or the definition of SUBREG_TO_REG is broken


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

https://reviews.llvm.org/D150388