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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -S -passes='early-cse' -earlycse-debug-hash | FileCheck %s --check-prefix=CHECK-NOMEMSSA
; RUN: opt < %s -S -passes='early-cse<memssa>' | FileCheck %s
; RUN: opt < %s -S -passes='early-cse' | FileCheck %s --check-prefix=CHECK-NOMEMSSA
; RUN: opt < %s -S -aa-pipeline=basic-aa -passes='early-cse<memssa>' | FileCheck %s
@G1 = global i32 zeroinitializer
@G2 = global i32 zeroinitializer
@G3 = global i32 zeroinitializer
;; Simple load value numbering across non-clobbering store.
define i32 @test1() {
; CHECK-NOMEMSSA-LABEL: @test1(
; CHECK-NOMEMSSA-NEXT: [[V1:%.*]] = load i32, ptr @G1, align 4
; CHECK-NOMEMSSA-NEXT: store i32 0, ptr @G2, align 4
; CHECK-NOMEMSSA-NEXT: [[V2:%.*]] = load i32, ptr @G1, align 4
; CHECK-NOMEMSSA-NEXT: [[DIFF:%.*]] = sub i32 [[V1]], [[V2]]
; CHECK-NOMEMSSA-NEXT: ret i32 [[DIFF]]
;
; CHECK-LABEL: @test1(
; CHECK-NEXT: [[V1:%.*]] = load i32, ptr @G1, align 4
; CHECK-NEXT: store i32 0, ptr @G2, align 4
; CHECK-NEXT: ret i32 0
;
%V1 = load i32, ptr @G1
store i32 0, ptr @G2
%V2 = load i32, ptr @G1
%Diff = sub i32 %V1, %V2
ret i32 %Diff
}
;; Simple dead store elimination across non-clobbering store.
define void @test2() {
; CHECK-NOMEMSSA-LABEL: @test2(
; CHECK-NOMEMSSA-NEXT: entry:
; CHECK-NOMEMSSA-NEXT: [[V1:%.*]] = load i32, ptr @G1, align 4
; CHECK-NOMEMSSA-NEXT: store i32 0, ptr @G2, align 4
; CHECK-NOMEMSSA-NEXT: store i32 [[V1]], ptr @G1, align 4
; CHECK-NOMEMSSA-NEXT: ret void
;
; CHECK-LABEL: @test2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[V1:%.*]] = load i32, ptr @G1, align 4
; CHECK-NEXT: store i32 0, ptr @G2, align 4
; CHECK-NEXT: ret void
;
entry:
%V1 = load i32, ptr @G1
store i32 0, ptr @G2
store i32 %V1, ptr @G1
ret void
}
;; Check that memoryphi optimization happens during EarlyCSE, enabling
;; more load CSE opportunities.
define void @test_memphiopt(i1 %c, ptr %p) {
; CHECK-NOMEMSSA-LABEL: @test_memphiopt(
; CHECK-NOMEMSSA-NEXT: entry:
; CHECK-NOMEMSSA-NEXT: [[V1:%.*]] = load i32, ptr @G1, align 4
; CHECK-NOMEMSSA-NEXT: br i1 [[C:%.*]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK-NOMEMSSA: then:
; CHECK-NOMEMSSA-NEXT: [[PV:%.*]] = load i32, ptr [[P:%.*]], align 4
; CHECK-NOMEMSSA-NEXT: br label [[END]]
; CHECK-NOMEMSSA: end:
; CHECK-NOMEMSSA-NEXT: [[V2:%.*]] = load i32, ptr @G1, align 4
; CHECK-NOMEMSSA-NEXT: [[SUM:%.*]] = add i32 [[V1]], [[V2]]
; CHECK-NOMEMSSA-NEXT: store i32 [[SUM]], ptr @G2, align 4
; CHECK-NOMEMSSA-NEXT: ret void
;
; CHECK-LABEL: @test_memphiopt(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[V1:%.*]] = load i32, ptr @G1, align 4
; CHECK-NEXT: br i1 [[C:%.*]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK: then:
; CHECK-NEXT: [[PV:%.*]] = load i32, ptr [[P:%.*]], align 4
; CHECK-NEXT: br label [[END]]
; CHECK: end:
; CHECK-NEXT: [[SUM:%.*]] = add i32 [[V1]], [[V1]]
; CHECK-NEXT: store i32 [[SUM]], ptr @G2, align 4
; CHECK-NEXT: ret void
;
entry:
%v1 = load i32, ptr @G1
br i1 %c, label %then, label %end
then:
%pv = load i32, ptr %p
store i32 %pv, ptr %p
br label %end
end:
%v2 = load i32, ptr @G1
%sum = add i32 %v1, %v2
store i32 %sum, ptr @G2
ret void
}
;; Check that MemoryPhi optimization and MemoryUse re-optimization
;; happens during EarlyCSE, enabling more load CSE opportunities.
define void @test_memphiopt2(i1 %c, ptr %p) {
; CHECK-NOMEMSSA-LABEL: @test_memphiopt2(
; CHECK-NOMEMSSA-NEXT: entry:
; CHECK-NOMEMSSA-NEXT: [[V1:%.*]] = load i32, ptr @G1, align 4
; CHECK-NOMEMSSA-NEXT: store i32 [[V1]], ptr @G2, align 4
; CHECK-NOMEMSSA-NEXT: br i1 [[C:%.*]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK-NOMEMSSA: then:
; CHECK-NOMEMSSA-NEXT: [[PV:%.*]] = load i32, ptr [[P:%.*]], align 4
; CHECK-NOMEMSSA-NEXT: br label [[END]]
; CHECK-NOMEMSSA: end:
; CHECK-NOMEMSSA-NEXT: [[V2:%.*]] = load i32, ptr @G1, align 4
; CHECK-NOMEMSSA-NEXT: store i32 [[V2]], ptr @G3, align 4
; CHECK-NOMEMSSA-NEXT: ret void
;
; CHECK-LABEL: @test_memphiopt2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[V1:%.*]] = load i32, ptr @G1, align 4
; CHECK-NEXT: store i32 [[V1]], ptr @G2, align 4
; CHECK-NEXT: br i1 [[C:%.*]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK: then:
; CHECK-NEXT: [[PV:%.*]] = load i32, ptr [[P:%.*]], align 4
; CHECK-NEXT: br label [[END]]
; CHECK: end:
; CHECK-NEXT: store i32 [[V1]], ptr @G3, align 4
; CHECK-NEXT: ret void
;
entry:
%v1 = load i32, ptr @G1
store i32 %v1, ptr @G2
br i1 %c, label %then, label %end
then:
%pv = load i32, ptr %p
store i32 %pv, ptr %p
br label %end
end:
%v2 = load i32, ptr @G1
store i32 %v2, ptr @G3
ret void
}
;; Check that we respect lifetime.start/lifetime.end intrinsics when deleting
;; stores that, without the lifetime calls, would be writebacks.
define void @test_writeback_lifetimes(ptr %p) {
; CHECK-NOMEMSSA-LABEL: @test_writeback_lifetimes(
; CHECK-NOMEMSSA-NEXT: entry:
; CHECK-NOMEMSSA-NEXT: [[Q:%.*]] = getelementptr i32, ptr [[P:%.*]], i64 1
; CHECK-NOMEMSSA-NEXT: [[PV:%.*]] = load i32, ptr [[P]], align 4
; CHECK-NOMEMSSA-NEXT: [[QV:%.*]] = load i32, ptr [[Q]], align 4
; CHECK-NOMEMSSA-NEXT: call void @llvm.lifetime.end.p0(i64 8, ptr [[P]])
; CHECK-NOMEMSSA-NEXT: call void @llvm.lifetime.start.p0(i64 8, ptr [[P]])
; CHECK-NOMEMSSA-NEXT: store i32 [[PV]], ptr [[P]], align 4
; CHECK-NOMEMSSA-NEXT: store i32 [[QV]], ptr [[Q]], align 4
; CHECK-NOMEMSSA-NEXT: ret void
;
; CHECK-LABEL: @test_writeback_lifetimes(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[Q:%.*]] = getelementptr i32, ptr [[P:%.*]], i64 1
; CHECK-NEXT: [[PV:%.*]] = load i32, ptr [[P]], align 4
; CHECK-NEXT: [[QV:%.*]] = load i32, ptr [[Q]], align 4
; CHECK-NEXT: call void @llvm.lifetime.end.p0(i64 8, ptr [[P]])
; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 8, ptr [[P]])
; CHECK-NEXT: store i32 [[PV]], ptr [[P]], align 4
; CHECK-NEXT: store i32 [[QV]], ptr [[Q]], align 4
; CHECK-NEXT: ret void
;
entry:
%q = getelementptr i32, ptr %p, i64 1
%pv = load i32, ptr %p
%qv = load i32, ptr %q
call void @llvm.lifetime.end.p0(i64 8, ptr %p)
call void @llvm.lifetime.start.p0(i64 8, ptr %p)
store i32 %pv, ptr %p
store i32 %qv, ptr %q
ret void
}
;; Check that we respect lifetime.start/lifetime.end intrinsics when deleting
;; stores that, without the lifetime calls, would be writebacks.
define void @test_writeback_lifetimes_multi_arg(ptr %p, ptr %q) {
; CHECK-NOMEMSSA-LABEL: @test_writeback_lifetimes_multi_arg(
; CHECK-NOMEMSSA-NEXT: entry:
; CHECK-NOMEMSSA-NEXT: [[PV:%.*]] = load i32, ptr [[P:%.*]], align 4
; CHECK-NOMEMSSA-NEXT: [[QV:%.*]] = load i32, ptr [[Q:%.*]], align 4
; CHECK-NOMEMSSA-NEXT: call void @llvm.lifetime.end.p0(i64 8, ptr [[P]])
; CHECK-NOMEMSSA-NEXT: call void @llvm.lifetime.start.p0(i64 8, ptr [[P]])
; CHECK-NOMEMSSA-NEXT: store i32 [[PV]], ptr [[P]], align 4
; CHECK-NOMEMSSA-NEXT: store i32 [[QV]], ptr [[Q]], align 4
; CHECK-NOMEMSSA-NEXT: ret void
;
; CHECK-LABEL: @test_writeback_lifetimes_multi_arg(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[PV:%.*]] = load i32, ptr [[P:%.*]], align 4
; CHECK-NEXT: [[QV:%.*]] = load i32, ptr [[Q:%.*]], align 4
; CHECK-NEXT: call void @llvm.lifetime.end.p0(i64 8, ptr [[P]])
; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 8, ptr [[P]])
; CHECK-NEXT: store i32 [[PV]], ptr [[P]], align 4
; CHECK-NEXT: store i32 [[QV]], ptr [[Q]], align 4
; CHECK-NEXT: ret void
;
entry:
%pv = load i32, ptr %p
%qv = load i32, ptr %q
call void @llvm.lifetime.end.p0(i64 8, ptr %p)
call void @llvm.lifetime.start.p0(i64 8, ptr %p)
store i32 %pv, ptr %p
store i32 %qv, ptr %q
ret void
}
declare void @llvm.lifetime.end.p0(i64, ptr)
declare void @llvm.lifetime.start.p0(i64, ptr)
|
