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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple aarch64 -run-pass=aarch64-prelegalizer-combiner -verify-machineinstrs %s -o - | FileCheck %s
--- |
@g = external hidden unnamed_addr global i32, align 4
define void @not_necessarily_equiv_loads() { ret void }
define void @invariant_loads() { ret void }
define void @both_have_to_be_invariant_1() { ret void }
define void @both_have_to_be_invariant_2() { ret void }
define void @both_have_to_have_same_size() { ret void }
...
---
name: not_necessarily_equiv_loads
tracksRegLiveness: true
machineFunctionInfo: {}
body: |
bb.0:
; %load1 || %load2 == %load1 is not necessarily true, even though they
; both load from the same address. Whatever is in that address may be
; changed by another instruction which appears between them.
;
; Check that we don't remove the G_OR.
; CHECK-LABEL: name: not_necessarily_equiv_loads
; CHECK: %ptr:_(p0) = G_GLOBAL_VALUE @g
; CHECK-NEXT: %load1:_(s32) = G_LOAD %ptr(p0) :: (load (s32) from @g)
; CHECK-NEXT: %load2:_(s32) = G_LOAD %ptr(p0) :: (load (s32) from @g)
; CHECK-NEXT: %or:_(s32) = G_OR %load2, %load1
; CHECK-NEXT: G_STORE %or(s32), %ptr(p0) :: (store (s32) into @g)
; CHECK-NEXT: RET_ReallyLR
%ptr:_(p0) = G_GLOBAL_VALUE @g
%load1:_(s32) = G_LOAD %ptr(p0) :: (load (s32) from @g)
%load2:_(s32) = G_LOAD %ptr(p0) :: (load (s32) from @g)
%or:_(s32) = G_OR %load2, %load1
G_STORE %or(s32), %ptr(p0) :: (store (s32) into @g)
RET_ReallyLR
...
---
name: invariant_loads
tracksRegLiveness: true
machineFunctionInfo: {}
body: |
bb.0:
; %load1 || %load2 == %load1 is fine here, because the loads are invariant.
; CHECK-LABEL: name: invariant_loads
; CHECK: %ptr:_(p0) = G_GLOBAL_VALUE @g
; CHECK-NEXT: %load2:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable invariant load (s32) from @g)
; CHECK-NEXT: G_STORE %load2(s32), %ptr(p0) :: (store (s32) into @g)
; CHECK-NEXT: RET_ReallyLR
%ptr:_(p0) = G_GLOBAL_VALUE @g
%load1:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable invariant load (s32) from @g)
%load2:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable invariant load (s32) from @g)
%or:_(s32) = G_OR %load2, %load1
G_STORE %or(s32), %ptr(p0) :: (store (s32) into @g)
RET_ReallyLR
...
---
name: both_have_to_be_invariant_1
tracksRegLiveness: true
machineFunctionInfo: {}
body: |
bb.0:
; We shouldn't combine here, because the loads both have to be invariant.
; CHECK-LABEL: name: both_have_to_be_invariant_1
; CHECK: %ptr:_(p0) = G_GLOBAL_VALUE @g
; CHECK-NEXT: %load1:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable invariant load (s32) from @g)
; CHECK-NEXT: %load2:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable load (s32) from @g)
; CHECK-NEXT: %or:_(s32) = G_OR %load2, %load1
; CHECK-NEXT: G_STORE %or(s32), %ptr(p0) :: (store (s32) into @g)
; CHECK-NEXT: RET_ReallyLR
%ptr:_(p0) = G_GLOBAL_VALUE @g
%load1:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable invariant load (s32) from @g)
%load2:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable load (s32) from @g)
%or:_(s32) = G_OR %load2, %load1
G_STORE %or(s32), %ptr(p0) :: (store (s32) into @g)
RET_ReallyLR
...
---
name: both_have_to_be_invariant_2
tracksRegLiveness: true
machineFunctionInfo: {}
body: |
bb.0:
; We shouldn't combine here, because the loads both have to be invariant.
; CHECK-LABEL: name: both_have_to_be_invariant_2
; CHECK: %ptr:_(p0) = G_GLOBAL_VALUE @g
; CHECK-NEXT: %load1:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable load (s32) from @g)
; CHECK-NEXT: %load2:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable invariant load (s32) from @g)
; CHECK-NEXT: %or:_(s32) = G_OR %load2, %load1
; CHECK-NEXT: G_STORE %or(s32), %ptr(p0) :: (store (s32) into @g)
; CHECK-NEXT: RET_ReallyLR
%ptr:_(p0) = G_GLOBAL_VALUE @g
%load1:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable load (s32) from @g)
%load2:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable invariant load (s32) from @g)
%or:_(s32) = G_OR %load2, %load1
G_STORE %or(s32), %ptr(p0) :: (store (s32) into @g)
RET_ReallyLR
...
---
name: both_have_to_have_same_size
tracksRegLiveness: true
machineFunctionInfo: {}
body: |
bb.0:
; We shouldn't combine here, because the loads both have to have the same size.
; CHECK-LABEL: name: both_have_to_have_same_size
; CHECK: %ptr:_(p0) = G_GLOBAL_VALUE @g
; CHECK-NEXT: %load1:_(s32) = G_ZEXTLOAD %ptr(p0) :: (dereferenceable invariant load (s8) from @g)
; CHECK-NEXT: %load2:_(s32) = G_ZEXTLOAD %ptr(p0) :: (dereferenceable invariant load (s16) from @g)
; CHECK-NEXT: %or:_(s32) = G_OR %load2, %load1
; CHECK-NEXT: G_STORE %or(s32), %ptr(p0) :: (store (s32) into @g)
; CHECK-NEXT: RET_ReallyLR
%ptr:_(p0) = G_GLOBAL_VALUE @g
%load1:_(s32) = G_ZEXTLOAD %ptr(p0) :: (dereferenceable invariant load (s8) from @g)
%load2:_(s32) = G_ZEXTLOAD %ptr(p0) :: (dereferenceable invariant load (s16) from @g)
%or:_(s32) = G_OR %load2, %load1
G_STORE %or(s32), %ptr(p0) :: (store (s32) into @g)
RET_ReallyLR
...
|
