1# RUN: llc %s -run-pass greedy -o - | FileCheck %s
2# Check that we don't insert spill code for undef values.
3# Uninitialized memory for them is fine.
4# PR33311
5--- |
6  ; ModuleID = 'stuff.ll'
7  target triple = "aarch64--"
8
9  @g = external global i32
10
11  define void @foobar() {
12    ret void
13  }
14
15...
16---
17name:            foobar
18alignment:       4
19tracksRegLiveness: true
20registers:
21  - { id: 0, class: gpr32 }
22  - { id: 1, class: gpr32 }
23  - { id: 2, class: gpr32all }
24  - { id: 3, class: gpr32 }
25  - { id: 4, class: gpr64common }
26  - { id: 5, class: gpr32 }
27  - { id: 6, class: gpr64common }
28  - { id: 7, class: gpr32 }
29  - { id: 8, class: gpr32 }
30  - { id: 9, class: gpr64 }
31body:             |
32  bb.0:
33    liveins: $x0
34    successors: %bb.1, %bb.2
35
36    ; %8 is going to be spilled.
37    ; But on that path, we don't care about its value.
38    ; Emit a simple KILL instruction instead of an
39    ; actual spill.
40    ; CHECK: [[UNDEF:%[0-9]+]]:gpr32 = IMPLICIT_DEF
41    ; CHECK-NEXT: KILL [[UNDEF]]
42    %8 = IMPLICIT_DEF
43    ; %9 us going to be spilled.
44    ; But it is only partially undef.
45    ; Make sure we spill it properly
46    ; CHECK: [[NINE:%[0-9]+]]:gpr64 = COPY $x0
47    ; CHECK: [[NINE]].sub_32:gpr64 = IMPLICIT_DEF
48    ; CHECK-NEXT: STRXui [[NINE]]
49    %9 = COPY $x0
50    %9.sub_32 = IMPLICIT_DEF
51    CBNZW $wzr, %bb.2
52    B %bb.1
53
54  bb.1:
55    %4 = ADRP target-flags(aarch64-page) @g
56    %8 = LDRWui %4, target-flags(aarch64-pageoff, aarch64-nc) @g :: (volatile dereferenceable load 4 from @g)
57    INLINEASM &nop, 1, 12, implicit-def dead early-clobber $x0, 12, implicit-def dead early-clobber $x1, 12, implicit-def dead early-clobber $x2, 12, implicit-def dead early-clobber $x3, 12, implicit-def dead early-clobber $x4, 12, implicit-def dead early-clobber $x5, 12, implicit-def dead early-clobber $x6, 12, implicit-def dead early-clobber $x7, 12, implicit-def dead early-clobber $x8, 12, implicit-def dead early-clobber $x9, 12, implicit-def dead early-clobber $x10, 12, implicit-def dead early-clobber $x11, 12, implicit-def dead early-clobber $x12, 12, implicit-def dead early-clobber $x13, 12, implicit-def dead early-clobber $x14, 12, implicit-def dead early-clobber $x15, 12, implicit-def dead early-clobber $x16, 12, implicit-def dead early-clobber $x17, 12, implicit-def dead early-clobber $x18, 12, implicit-def dead early-clobber $x19, 12, implicit-def dead early-clobber $x20, 12, implicit-def dead early-clobber $x21, 12, implicit-def dead early-clobber $x22, 12, implicit-def dead early-clobber $x23, 12, implicit-def dead early-clobber $x24, 12, implicit-def dead early-clobber $x25, 12, implicit-def dead early-clobber $x26, 12, implicit-def dead early-clobber $x27, 12, implicit-def dead early-clobber $x28, 12, implicit-def dead early-clobber $fp, 12, implicit-def dead early-clobber $lr
58
59  bb.2:
60    INLINEASM &nop, 1, 12, implicit-def dead early-clobber $x0, 12, implicit-def dead early-clobber $x1, 12, implicit-def dead early-clobber $x2, 12, implicit-def dead early-clobber $x3, 12, implicit-def dead early-clobber $x4, 12, implicit-def dead early-clobber $x5, 12, implicit-def dead early-clobber $x6, 12, implicit-def dead early-clobber $x7, 12, implicit-def dead early-clobber $x8, 12, implicit-def dead early-clobber $x9, 12, implicit-def dead early-clobber $x10, 12, implicit-def dead early-clobber $x11, 12, implicit-def dead early-clobber $x12, 12, implicit-def dead early-clobber $x13, 12, implicit-def dead early-clobber $x14, 12, implicit-def dead early-clobber $x15, 12, implicit-def dead early-clobber $x16, 12, implicit-def dead early-clobber $x17, 12, implicit-def dead early-clobber $x18, 12, implicit-def dead early-clobber $x19, 12, implicit-def dead early-clobber $x20, 12, implicit-def dead early-clobber $x21, 12, implicit-def dead early-clobber $x22, 12, implicit-def dead early-clobber $x23, 12, implicit-def dead early-clobber $x24, 12, implicit-def dead early-clobber $x25, 12, implicit-def dead early-clobber $x26, 12, implicit-def dead early-clobber $x27, 12, implicit-def dead early-clobber $x28, 12, implicit-def dead early-clobber $fp, 12, implicit-def dead early-clobber $lr
61    %6 = ADRP target-flags(aarch64-page) @g
62    $w0 = MOVi32imm 42
63    STRWui %8, %6, target-flags(aarch64-pageoff, aarch64-nc) @g :: (volatile store 4 into @g)
64    STRXui %9, %6, target-flags(aarch64-pageoff, aarch64-nc) @g :: (volatile store 8 into @g)
65    RET_ReallyLR implicit killed $w0
66
67...
68