# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -march=amdgcn -mcpu=gfx900 -verify-machineinstrs -run-pass=simple-register-coalescing -o - %s | FileCheck -check-prefix=GCN %s

# Test used to crash with message:
# JoinVals::ConflictResolution (anonymous namespace)::JoinVals::analyzeValue(unsigned int, (anonymous namespace)::JoinVals &): Assertion `DefMI != nullptr' failed

---
name:            test
tracksRegLiveness: true
body:             |
  ; GCN-LABEL: name: test
  ; GCN: bb.0:
  ; GCN-NEXT:   successors: %bb.2(0x80000000)
  ; GCN-NEXT: {{  $}}
  ; GCN-NEXT:   undef %1.sub0:vreg_128 = IMPLICIT_DEF
  ; GCN-NEXT:   %1.sub1:vreg_128 = IMPLICIT_DEF
  ; GCN-NEXT:   S_BRANCH %bb.2
  ; GCN-NEXT: {{  $}}
  ; GCN-NEXT: bb.1:
  ; GCN-NEXT:   successors: %bb.2(0x80000000)
  ; GCN-NEXT: {{  $}}
  ; GCN-NEXT:   [[DEF:%[0-9]+]]:vreg_128 = IMPLICIT_DEF
  ; GCN-NEXT: {{  $}}
  ; GCN-NEXT: bb.2:
  ; GCN-NEXT:   [[DEF]].sub2:vreg_128 = COPY undef %3:sreg_32
  ; GCN-NEXT:   S_ENDPGM 0, implicit [[DEF]]
  bb.0:
    undef %0.sub0:vreg_128 = IMPLICIT_DEF
    %0.sub1:vreg_128 = IMPLICIT_DEF
    %1:vreg_128 = COPY %0
    %2:vreg_128 = COPY killed %0
    S_BRANCH %bb.2

  bb.1:
    %1:vreg_128 = COPY killed undef %1

  bb.2:
    %1.sub2:vreg_128 = COPY undef %3:sreg_32
    %2:vreg_128 = COPY killed %1
    %4:vreg_128 = COPY killed %2
    S_ENDPGM 0, implicit killed %4

...