[PATCH] D134183: [WIP][RegCoalescer][TwoAddrInst] Keep undef subreg copies that are used in early-clobber insts

[Jay Foad via Phabricator via llvm-commits]

foad added a comment.

Well, what is the exact definition of earlyclobber in MIR? Is it OK for an earlyclobber output to overwrite an undef input? Apparently it is OK, but you are changing the definition to say it is not OK. I think this deserves wider discussion.



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Comment at: llvm/test/CodeGen/AMDGPU/mad_u64_u32.ll:18
 ; GFX10-NEXT:    ; return to shader part epilog
+;
+; GFX11-LABEL: mad_i32_vvv:
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Please rebase on f09e3ad88a19.


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  https://reviews.llvm.org/D134183/new/

https://reviews.llvm.org/D134183