[PATCH] D157272: [RISCV] Handle subregs when folding vmerge into vops

[Philip Reames via Phabricator via llvm-commits]

reames added inline comments.


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Comment at: llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp:3354
+  // TargetConstant:i32<4>
+  //   t40: v2i32 = COPY_TO_REGCLASS t41, TargetConstant:i64<22>
+  //     t41: nxv1i32,ch = PseudoVLE32_V_MF2 ...
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I'm looking at this, and am trying to understand why we get the COPY_TO_REGCLASS here.  If I'm reading this right, we should be generating this only when doing a insert_subreg between two equally LMUL-sized register groups.  Given that, I think we must have had two insert_subregs originally, and shouldn't one of have been combined away?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D157272/new/

https://reviews.llvm.org/D157272