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
|
; RUN: opt -passes=inline < %s -S -o - -inline-threshold=3 | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
declare void @pad() readnone
define void @outer1(ptr %a) {
; CHECK-LABEL: @outer1(
; CHECK-NOT: call void @inner1
%b = alloca i32
call void @inner1(ptr %a, ptr %b)
ret void
}
define void @inner1(ptr %a, ptr %b) {
%1 = load i32, ptr %a
store i32 %1, ptr %b ; This store does not clobber the first load.
%2 = load i32, ptr %a
call void @pad()
%3 = load i32, ptr %a
ret void
}
define void @outer2(ptr %a, ptr %b) {
; CHECK-LABEL: @outer2(
; CHECK: call void @inner2
call void @inner2(ptr %a, ptr %b)
ret void
}
define void @inner2(ptr %a, ptr %b) {
%1 = load i32, ptr %a
store i32 %1, ptr %b ; This store clobbers the first load.
%2 = load i32, ptr %a
call void @pad()
ret void
}
define void @outer3(ptr %a) {
; CHECK-LABEL: @outer3(
; CHECK: call void @inner3
call void @inner3(ptr %a)
ret void
}
declare void @ext()
define void @inner3(ptr %a) {
%1 = load i32, ptr %a
call void @ext() ; This call clobbers the first load.
%2 = load i32, ptr %a
ret void
}
define void @outer4(ptr %a, ptr %b, ptr %c) {
; CHECK-LABEL: @outer4(
; CHECK-NOT: call void @inner4
call void @inner4(ptr %a, ptr %b, i1 false)
ret void
}
define void @inner4(ptr %a, ptr %b, i1 %pred) {
%1 = load i32, ptr %a
br i1 %pred, label %cond_true, label %cond_false
cond_true:
store i32 %1, ptr %b ; This store does not clobber the first load.
br label %cond_false
cond_false:
%2 = load i32, ptr %a
call void @pad()
%3 = load i32, ptr %a
%4 = load i32, ptr %a
ret void
}
define void @outer5(ptr %a, double %b) {
; CHECK-LABEL: @outer5(
; CHECK-NOT: call void @inner5
call void @inner5(ptr %a, double %b)
ret void
}
declare double @llvm.fabs.f64(double) nounwind readnone
define void @inner5(ptr %a, double %b) {
%1 = load i32, ptr %a
%2 = call double @llvm.fabs.f64(double %b) ; This intrinsic does not clobber the first load.
%3 = load i32, ptr %a
call void @pad()
ret void
}
define void @outer6(ptr %a, ptr %ptr) {
; CHECK-LABEL: @outer6(
; CHECK-NOT: call void @inner6
call void @inner6(ptr %a, ptr %ptr)
ret void
}
declare void @llvm.lifetime.start.p0(i64, ptr nocapture) argmemonly nounwind
define void @inner6(ptr %a, ptr %ptr) {
%1 = load i32, ptr %a
call void @llvm.lifetime.start.p0(i64 32, ptr %ptr) ; This intrinsic does not clobber the first load.
%2 = load i32, ptr %a
call void @pad()
%3 = load i32, ptr %a
ret void
}
define void @outer7(ptr %a) {
; CHECK-LABEL: @outer7(
; CHECK-NOT: call void @inner7
call void @inner7(ptr %a)
ret void
}
declare void @ext2() readnone
define void @inner7(ptr %a) {
%1 = load i32, ptr %a
call void @ext2() ; This call does not clobber the first load.
%2 = load i32, ptr %a
ret void
}
define void @outer8(ptr %a) {
; CHECK-LABEL: @outer8(
; CHECK-NOT: call void @inner8
call void @inner8(ptr %a, ptr @ext2)
ret void
}
define void @inner8(ptr %a, ptr %f) {
%1 = load i32, ptr %a
call void %f() ; This indirect call does not clobber the first load.
%2 = load i32, ptr %a
call void @pad()
call void @pad()
call void @pad()
call void @pad()
call void @pad()
call void @pad()
call void @pad()
call void @pad()
call void @pad()
call void @pad()
call void @pad()
call void @pad()
ret void
}
define void @outer9(ptr %a) {
; CHECK-LABEL: @outer9(
; CHECK: call void @inner9
call void @inner9(ptr %a, ptr @ext)
ret void
}
define void @inner9(ptr %a, ptr %f) {
%1 = load i32, ptr %a
call void %f() ; This indirect call clobbers the first load.
%2 = load i32, ptr %a
call void @pad()
call void @pad()
call void @pad()
call void @pad()
call void @pad()
call void @pad()
call void @pad()
call void @pad()
call void @pad()
call void @pad()
call void @pad()
call void @pad()
ret void
}
define void @outer10(ptr %a) {
; CHECK-LABEL: @outer10(
; CHECK: call void @inner10
%b = alloca i32
call void @inner10(ptr %a, ptr %b)
ret void
}
define void @inner10(ptr %a, ptr %b) {
%1 = load i32, ptr %a
store i32 %1, ptr %b
%2 = load volatile i32, ptr %a ; volatile load should be kept.
call void @pad()
%3 = load volatile i32, ptr %a ; Same as the above.
ret void
}
|
