llvm/llvm/test/tools/llvm-reduce/mir/subreg-def1.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: %{{[0-9]+}}.sub0:vreg_64 = V_ADD_U32_e32 %{{[0-9]+}}.sub1, %{{[0-9]+}}.sub0, implicit $exec
# CHECK-INTERESTINGNESS: %{{[0-9]+}}.sub0:vreg_64 = V_ADD_U32_e32 4, %{{[0-9]+}}.sub0, implicit $exec

# RESULT: undef %{{[0-9]+}}.sub1:vreg_64 = IMPLICIT_DEF
# RESULT-NEXT: %0.sub0:vreg_64 = V_ADD_U32_e32 %{{[0-9]+}}.sub1, %{{[0-9]+}}.sub0, implicit $exec
# RESULT-NEXT: %1.sub0:vreg_64 = V_ADD_U32_e32 4, %{{[0-9]+}}.sub0, implicit $exec
# RESULT-NEXT: S_ENDPGM 0, implicit %{{[0-9]+}}, implicit %{{[0-9]+}}.sub0
---
name:            f
tracksRegLiveness: true
body:             |
  bb.0:
    S_WAITCNT 0
    undef %0.sub1:vreg_64 = V_MOV_B32_e32 0, implicit $exec
    %1.sub1:vreg_64 = V_ADD_U32_e32 2, %0.sub1, implicit $exec
    %0.sub0:vreg_64 = V_ADD_U32_e32 %1.sub1, %0.sub0, implicit $exec
    %1.sub0:vreg_64 = V_ADD_U32_e32 4, %0.sub0, implicit $exec
    S_ENDPGM 0, implicit %1, implicit %0.sub0
...