# RUN: llc -O0 -mtriple=aarch64-apple-ios -global-isel -start-before=legalizer -stop-after=instruction-select %s -o - | FileCheck %s

# We run the legalizer to combine the trivial EXTRACT_SEQ pair, leaving %1 and
# %2 orphaned after instruction-selection (no instructions define or use
# them). This shouldn't be a problem.

--- |
  target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"

  define void @unused_reg() { ret void }

---
# CHECK-LABEL: name: unused_reg
name:            unused_reg
legalized:       true
regBankSelected: true
tracksRegLiveness: true

# CHECK:      body:
# CHECK:  %0 = COPY %w0
# CHECK:  %w0 = COPY %0

body:             |
  bb.0:
    liveins: %w0
    %0:gpr(s32) = COPY %w0
    %1:gpr(s32) = G_MERGE_VALUES %0(s32)
    %2:gpr(s32) = G_UNMERGE_VALUES %1(s32)
    %w0 = COPY %2(s32)
...