llvm/test/tools/llvm-reduce/mir/undef-virt-reg.mir

# REQUIRES: amdgpu-registered-target
# RUN: llvm-reduce -abort-on-invalid-reduction --delta-passes=instructions -mtriple=amdgcn-amd-amdhsa --test FileCheck --test-arg --check-prefix=CHECK-INTERESTINGNESS --test-arg %s --test-arg --input-file %s -o %t 2> %t.log
# RUN: FileCheck --match-full-lines --check-prefix=RESULT %s < %t

# CHECK-INTERESTINGNESS: S_NOP 0

# RESULT: S_ENDPGM 0, implicit undef %0:vgpr_32

# Previously the the function clone would assert due to not preserving
# virtual registers which had no defs.

---
name: undef_vreg_operand
tracksRegLiveness: true
body:             |
  bb.0:
    S_NOP 0
    S_ENDPGM 0, implicit undef %0:vgpr_32

...