[all-commits] [llvm/llvm-project] ad66b5: [RISCV][Peephole] Clear kill flags for registers a...

[Piyou Chen via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ad66b5a62d0e811f4a90df6becaa0ac36757b682
      https://github.com/llvm/llvm-project/commit/ad66b5a62d0e811f4a90df6becaa0ac36757b682
  Author: Piyou Chen <piyou.chen at sifive.com>
  Date:   2025-05-09 (Fri, 09 May 2025)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVVectorPeephole.cpp
    M llvm/test/CodeGen/RISCV/rvv/vmv.v.v-peephole.mir

  Log Message:
  -----------
  [RISCV][Peephole] Clear kill flags for registers after foldUndefPassthruVMV_V_V (#138847)

Without clearing kill flags, this pass will generate bad machine code.

```
*** Bad machine code: Using a killed virtual register ***
- function:    main
- basic block: %bb.0 entry (0x437ef928)
- instruction: %12:vrn7m1 = INSERT_SUBREG %11:vrn7m1(tied-def 0), %0:vr, %subreg.sub_vrm1_0
- operand 2:   %0:vr
```



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