llvm/test/CodeGen/RISCV/rvv/vmv0-elimination.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
# RUN: llc %s -o - -mtriple=riscv64 -mattr=+v -run-pass=riscv-vmv0-elimination -verify-machineinstrs | FileCheck %s

# If we peek through a COPY to vmv0, we may leave it dead. Make sure we delete
# it so the register allocator doesn't try to allocate it, which can lead to a
# regalloc error.
# https://github.com/llvm/llvm-project/pull/126850#issuecomment-2685166388

---
name: dead_copy
body: |
  bb.0:
    liveins: $v8
    ; CHECK-LABEL: name: dead_copy
    ; CHECK: liveins: $v8
    ; CHECK-NEXT: {{  $}}
    ; CHECK-NEXT: %x:vr = COPY $v8
    ; CHECK-NEXT: $v0 = COPY %x
    ; CHECK-NEXT: PseudoVSE8_V_M1_MASK $noreg, $noreg, $v0, -1, 3 /* e8 */
    %x:vr = COPY $v8
    %y:vmv0 = COPY %x:vr
    PseudoVSE8_V_M1_MASK $noreg, $noreg, %y:vmv0, -1, 3