[PATCH] D103510: [RISCV] Use vmv.v.[v|i] if we know COPY is under the same vl and vtype.

[Craig Topper via Phabricator via llvm-commits]

craig.topper added inline comments.


================
Comment at: llvm/lib/Target/RISCV/RISCVInstrInfo.cpp:360
+        llvm_unreachable("Impossible LMUL for vector register copy.");
+      case RISCVII::LMUL_F8:
+        Opc = RISCV::PseudoVMV_V_V_MF8;
----------------
Is fractional lmul possible here?


================
Comment at: llvm/lib/Target/RISCV/RISCVInstrInfo.cpp:420
+      std::tie(LMulVal, Fractional) = RISCVVType::decodeVLMUL(LMul);
+      if (Fractional)
+        LMulVal = 1;
----------------
Is a fractional lmul even possible?


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D103510/new/

https://reviews.llvm.org/D103510