File: regalloc-liveout-undef.mir

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# RUN: llc -march=hexagon -run-pass liveintervals -run-pass machineverifier -run-pass register-coalescer %s -o - | FileCheck %s
#
# If there is no consumer of the live intervals, the live intervals pass
# will be freed immediately after it runs, before the verifier. Add a
# user (register coalescer in this case), so that the verification will
# cover live intervals as well.
#
# Make sure that this compiles successfully.
# CHECK: undef %1.isub_lo:doubleregs = A2_addi %1.isub_lo, 1

---
name: fred
tracksRegLiveness: true

registers:
  - { id: 0, class: intregs }
  - { id: 1, class: doubleregs }
  - { id: 2, class: predregs }
  - { id: 3, class: doubleregs }
body: |
  bb.0:
    liveins: $d0
    successors: %bb.1
        %0 = IMPLICIT_DEF
        %1 = COPY $d0

  bb.1:
    successors: %bb.1
        %2 = C2_cmpgt %0, %1.isub_lo
        %3 = COPY %1
        %1 = COPY %3
        undef %1.isub_lo = A2_addi %1.isub_lo, 1
        J2_jump %bb.1, implicit-def $pc
...