1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
# RUN: llc -mtriple=aarch64-none-linux-gnu -run-pass machine-cp -verify-machineinstrs -o - %s | FileCheck %s
--- |
define i32 @copyprop1(i32 %a, i32 %b) { ret i32 %a }
define i32 @copyprop2(i32 %a, i32 %b) { ret i32 %a }
define i32 @copyprop3(i32 %a, i32 %b) { ret i32 %a }
define i32 @copyprop4(i32 %a, i32 %b) { ret i32 %a }
define i32 @copyprop5(i32 %a, i32 %b) { ret i32 %a }
define i32 @copyprop6(i32 %a, i32 %b) { ret i32 %a }
declare i32 @foo(i32)
...
---
# The first copy is dead copy which is not used.
# CHECK-LABEL: name: copyprop1
# CHECK: bb.0:
# CHECK-NOT: $w20 = COPY
name: copyprop1
body: |
bb.0:
liveins: $w0, $w1
$w20 = COPY $w1
BL @foo, csr_aarch64_aapcs, implicit $w0, implicit-def $w0
RET_ReallyLR implicit $w0
...
---
# The first copy is not a dead copy which is used in the second copy after the
# call.
# CHECK-LABEL: name: copyprop2
# CHECK: bb.0:
# CHECK: $w20 = COPY
name: copyprop2
body: |
bb.0:
liveins: $w0, $w1
$w20 = COPY $w1
BL @foo, csr_aarch64_aapcs, implicit $w0, implicit-def $w0
$w0 = COPY $w20
RET_ReallyLR implicit $w0
...
---
# Both the first and second copy are dead copies which are not used.
# CHECK-LABEL: name: copyprop3
# CHECK: bb.0:
# CHECK-NOT: COPY
name: copyprop3
body: |
bb.0:
liveins: $w0, $w1
$w20 = COPY $w1
BL @foo, csr_aarch64_aapcs, implicit $w0, implicit-def $w0
$w20 = COPY $w0
RET_ReallyLR implicit $w0
...
# The second copy is removed as a NOP copy, after then the first copy become
# dead which should be removed as well.
# CHECK-LABEL: name: copyprop4
# CHECK: bb.0:
# CHECK-NOT: COPY
name: copyprop4
body: |
bb.0:
liveins: $w0, $w1
$w20 = COPY $w0
$w0 = COPY $w20
BL @foo, csr_aarch64_aapcs, implicit $w0, implicit-def $w0
RET_ReallyLR implicit $w0
...
# Don't try to erase any COPY which overlaps itself.
# CHECK-LABEL: name: copyprop5
# CHECK: bb.0:
# CHECK: COPY killed $q26_q27_q28_q29
# CHECK: COPY killed $q28_q29_q30_q31
name: copyprop5
body: |
bb.0:
liveins: $q26_q27_q28_q29
$q28_q29_q30_q31 = COPY killed $q26_q27_q28_q29
$q26_q27_q28_q29 = COPY killed $q28_q29_q30_q31
BL @foo, csr_aarch64_aapcs, implicit killed $q26_q27_q28_q29
RET_ReallyLR
...
# Don't try to analyze any COPY which overlaps itself.
# CHECK-LABEL: name: copyprop6
# CHECK: bb.0:
# CHECK: COPY killed $q26_q27_q28_q29
# CHECK: $q30 = COPY $q28
name: copyprop6
body: |
bb.0:
liveins: $q26_q27_q28_q29
$q28_q29_q30_q31 = COPY killed $q26_q27_q28_q29
$q30 = COPY $q28
BL @foo, csr_aarch64_aapcs, implicit killed $q28_q29_q30_q31
RET_ReallyLR
...
|
