[PATCH] D130622: [AMDGPU][SIFoldOperands] Clear kills when folding subreg COPY

[Jay Foad via Phabricator via llvm-commits]

foad added a comment.

So you start with this:

  %2:sreg_64_xexec = COPY %1.sub0_sub1:sgpr_128
  %3:sreg_64_xexec = COPY killed %1.sub2_sub3:sgpr_128
  %4:sreg_64 = COPY %2:sreg_64_xexec

and folding %2 into %4 gives this:

  %3:sreg_64_xexec = COPY killed %1.sub2_sub3:sgpr_128
  %4:sreg_64 = COPY %1.sub0_sub1:sgpr_128

but now the killed flag on the RHS of %3 is wrong. How is this handled in the normal non-subreg case?


Repository:
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  https://reviews.llvm.org/D130622/new/

https://reviews.llvm.org/D130622