libfunc_call.ll
8.13 KB
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
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
; RUN: opt < %s -analyze -branch-prob | FileCheck %s
; RUN: opt < %s -analyze -lazy-branch-prob | FileCheck %s
; RUN: opt < %s -passes='print<branch-prob>' -disable-output 2>&1 | FileCheck %s
declare i32 @strcmp(i8*, i8*)
declare i32 @strncmp(i8*, i8*, i32)
declare i32 @strcasecmp(i8*, i8*)
declare i32 @strncasecmp(i8*, i8*, i32)
declare i32 @memcmp(i8*, i8*)
declare i32 @nonstrcmp(i8*, i8*)
; Check that the result of strcmp is considered more likely to be nonzero than
; zero, and equally likely to be (nonzero) positive or negative.
define i32 @test_strcmp_eq(i8* %p, i8* %q) {
; CHECK: Printing analysis {{.*}} for function 'test_strcmp_eq'
entry:
%val = call i32 @strcmp(i8* %p, i8* %q)
%cond = icmp eq i32 %val, 0
br i1 %cond, label %then, label %else
; CHECK: edge entry -> then probability is 0x30000000 / 0x80000000 = 37.50%
; CHECK: edge entry -> else probability is 0x50000000 / 0x80000000 = 62.50%
then:
br label %exit
; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
else:
br label %exit
; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
exit:
%result = phi i32 [ 0, %then ], [ 1, %else ]
ret i32 %result
}
define i32 @test_strcmp_ne(i8* %p, i8* %q) {
; CHECK: Printing analysis {{.*}} for function 'test_strcmp_ne'
entry:
%val = call i32 @strcmp(i8* %p, i8* %q)
%cond = icmp ne i32 %val, 0
br i1 %cond, label %then, label %else
; CHECK: edge entry -> then probability is 0x50000000 / 0x80000000 = 62.50%
; CHECK: edge entry -> else probability is 0x30000000 / 0x80000000 = 37.50%
then:
br label %exit
; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
else:
br label %exit
; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
exit:
%result = phi i32 [ 0, %then ], [ 1, %else ]
ret i32 %result
}
define i32 @test_strcmp_sgt(i8* %p, i8* %q) {
; CHECK: Printing analysis {{.*}} for function 'test_strcmp_sgt'
entry:
%val = call i32 @strcmp(i8* %p, i8* %q)
%cond = icmp sgt i32 %val, 0
br i1 %cond, label %then, label %else
; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00%
; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00%
then:
br label %exit
; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
else:
br label %exit
; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
exit:
%result = phi i32 [ 0, %then ], [ 1, %else ]
ret i32 %result
}
define i32 @test_strcmp_slt(i8* %p, i8* %q) {
; CHECK: Printing analysis {{.*}} for function 'test_strcmp_slt'
entry:
%val = call i32 @strcmp(i8* %p, i8* %q)
%cond = icmp slt i32 %val, 0
br i1 %cond, label %then, label %else
; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00%
; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00%
then:
br label %exit
; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
else:
br label %exit
; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
exit:
%result = phi i32 [ 0, %then ], [ 1, %else ]
ret i32 %result
}
; Similarly check other library functions that have the same behaviour
define i32 @test_strncmp_sgt(i8* %p, i8* %q) {
; CHECK: Printing analysis {{.*}} for function 'test_strncmp_sgt'
entry:
%val = call i32 @strncmp(i8* %p, i8* %q, i32 4)
%cond = icmp sgt i32 %val, 0
br i1 %cond, label %then, label %else
; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00%
; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00%
then:
br label %exit
; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
else:
br label %exit
; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
exit:
%result = phi i32 [ 0, %then ], [ 1, %else ]
ret i32 %result
}
define i32 @test_strcasecmp_sgt(i8* %p, i8* %q) {
; CHECK: Printing analysis {{.*}} for function 'test_strcasecmp_sgt'
entry:
%val = call i32 @strcasecmp(i8* %p, i8* %q)
%cond = icmp sgt i32 %val, 0
br i1 %cond, label %then, label %else
; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00%
; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00%
then:
br label %exit
; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
else:
br label %exit
; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
exit:
%result = phi i32 [ 0, %then ], [ 1, %else ]
ret i32 %result
}
define i32 @test_strncasecmp_sgt(i8* %p, i8* %q) {
; CHECK: Printing analysis {{.*}} for function 'test_strncasecmp_sgt'
entry:
%val = call i32 @strncasecmp(i8* %p, i8* %q, i32 4)
%cond = icmp sgt i32 %val, 0
br i1 %cond, label %then, label %else
; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00%
; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00%
then:
br label %exit
; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
else:
br label %exit
; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
exit:
%result = phi i32 [ 0, %then ], [ 1, %else ]
ret i32 %result
}
define i32 @test_memcmp_sgt(i8* %p, i8* %q) {
; CHECK: Printing analysis {{.*}} for function 'test_memcmp_sgt'
entry:
%val = call i32 @memcmp(i8* %p, i8* %q)
%cond = icmp sgt i32 %val, 0
br i1 %cond, label %then, label %else
; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00%
; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00%
then:
br label %exit
; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
else:
br label %exit
; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
exit:
%result = phi i32 [ 0, %then ], [ 1, %else ]
ret i32 %result
}
; Check that for the result of a call to a non-library function the default
; heuristic is applied, i.e. positive more likely than negative, nonzero more
; likely than zero.
define i32 @test_nonstrcmp_eq(i8* %p, i8* %q) {
; CHECK: Printing analysis {{.*}} for function 'test_nonstrcmp_eq'
entry:
%val = call i32 @nonstrcmp(i8* %p, i8* %q)
%cond = icmp eq i32 %val, 0
br i1 %cond, label %then, label %else
; CHECK: edge entry -> then probability is 0x30000000 / 0x80000000 = 37.50%
; CHECK: edge entry -> else probability is 0x50000000 / 0x80000000 = 62.50%
then:
br label %exit
; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
else:
br label %exit
; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
exit:
%result = phi i32 [ 0, %then ], [ 1, %else ]
ret i32 %result
}
define i32 @test_nonstrcmp_ne(i8* %p, i8* %q) {
; CHECK: Printing analysis {{.*}} for function 'test_nonstrcmp_ne'
entry:
%val = call i32 @nonstrcmp(i8* %p, i8* %q)
%cond = icmp ne i32 %val, 0
br i1 %cond, label %then, label %else
; CHECK: edge entry -> then probability is 0x50000000 / 0x80000000 = 62.50%
; CHECK: edge entry -> else probability is 0x30000000 / 0x80000000 = 37.50%
then:
br label %exit
; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
else:
br label %exit
; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
exit:
%result = phi i32 [ 0, %then ], [ 1, %else ]
ret i32 %result
}
define i32 @test_nonstrcmp_sgt(i8* %p, i8* %q) {
; CHECK: Printing analysis {{.*}} for function 'test_nonstrcmp_sgt'
entry:
%val = call i32 @nonstrcmp(i8* %p, i8* %q)
%cond = icmp sgt i32 %val, 0
br i1 %cond, label %then, label %else
; CHECK: edge entry -> then probability is 0x50000000 / 0x80000000 = 62.50%
; CHECK: edge entry -> else probability is 0x30000000 / 0x80000000 = 37.50%
then:
br label %exit
; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
else:
br label %exit
; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
exit:
%result = phi i32 [ 0, %then ], [ 1, %else ]
ret i32 %result
}