[PATCH] D156164: [HACK] X86: Disable isCopyInstrImpl for undef subregister defs

[Vitaly Buka via Phabricator via llvm-commits]

vitalybuka accepted this revision.
vitalybuka added a comment.
This revision is now accepted and ready to land.

Thanks you!

LGTM, but I am not expert on CodeGen, please look for more reviews if needed.

Would you like to add one of reproducers as a test?

- check-all is green for me
- original issue is gone
- TODO will run a benchmark and update


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D156164/new/

https://reviews.llvm.org/D156164