1# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
2# RUN: llc -O0 -mtriple=aarch64-apple-ios -global-isel -start-before=legalizer -stop-after=instruction-select %s -o - | FileCheck %s
3
4# We run the legalizer to combine the trivial EXTRACT_SEQ pair, leaving %1 and
5# %2 orphaned after instruction-selection (no instructions define or use
6# them). This shouldn't be a problem.
7
8--- |
9  target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
10
11  define void @unused_reg() { ret void }
12
13---
14name:            unused_reg
15legalized:       true
16regBankSelected: true
17tracksRegLiveness: true
18
19
20body:             |
21  bb.0:
22    liveins: $w0
23    ; CHECK-LABEL: name: unused_reg
24    ; CHECK: liveins: $w0
25    ; CHECK: [[COPY:%[0-9]+]]:gpr32all = COPY $w0
26    ; CHECK: $w0 = COPY [[COPY]]
27    %0:gpr(s32) = COPY $w0
28    %1:gpr(s64) = G_MERGE_VALUES %0(s32), %0(s32)
29    %2:gpr(s32), %3:gpr(s32) = G_UNMERGE_VALUES %1(s64)
30    $w0 = COPY %2(s32)
31...
32