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
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
| ; RUN: opt < %s -passes='print<phi-values>' -disable-output 2>&1 | FileCheck %s
@X = common global i32 0
; CHECK-LABEL: PHI Values for function: simple
define void @simple(i32* %ptr) {
entry:
br i1 undef, label %if, label %else
if:
br label %end
else:
br label %end
end:
; CHECK: PHI %phi1 has values:
; CHECK-DAG: i32 0
; CHECK-DAG: i32 1
%phi1 = phi i32 [ 0, %if ], [ 1, %else ]
; CHECK: PHI %phi2 has values:
; CHECK-DAG: @X
; CHECK-DAG: %ptr
%phi2 = phi i32* [ @X, %if ], [ %ptr, %else ]
ret void
}
; CHECK-LABEL: PHI Values for function: chain
define void @chain() {
entry:
br i1 undef, label %if1, label %else1
if1:
br label %middle
else1:
br label %middle
middle:
; CHECK: PHI %phi1 has values:
; CHECK-DAG: i32 0
; CHECK-DAG: i32 1
%phi1 = phi i32 [ 0, %if1 ], [ 1, %else1 ]
br i1 undef, label %if2, label %else2
if2:
br label %end
else2:
br label %end
end:
; CHECK: PHI %phi2 has values:
; CHECK-DAG: i32 0
; CHECK-DAG: i32 1
; CHECK-DAG: i32 2
%phi2 = phi i32 [ %phi1, %if2 ], [ 2, %else2 ]
ret void
}
; CHECK-LABEL: PHI Values for function: no_values
define void @no_values() {
entry:
ret void
unreachable:
; CHECK: PHI %phi has values:
; CHECK-DAG: NONE
%phi = phi i32 [ %phi, %unreachable ]
br label %unreachable
}
; CHECK-LABEL: PHI Values for function: simple_loop
define void @simple_loop() {
entry:
br label %loop
loop:
; CHECK: PHI %phi has values:
; CHECK-DAG: i32 0
%phi = phi i32 [ 0, %entry ], [ %phi, %loop ]
br i1 undef, label %loop, label %end
end:
ret void
}
; CHECK-LABEL: PHI Values for function: complex_loop
define void @complex_loop() {
entry:
br i1 undef, label %loop, label %end
loop:
; CHECK: PHI %phi1 has values:
; CHECK-DAG: i32 0
; CHECK-DAG: i32 1
%phi1 = phi i32 [ 0, %entry ], [ %phi2, %then ]
br i1 undef, label %if, label %else
if:
br label %then
else:
br label %then
then:
; CHECK: PHI %phi2 has values:
; CHECK-DAG: i32 0
; CHECK-DAG: i32 1
%phi2 = phi i32 [ %phi1, %if ], [ 1, %else ]
br i1 undef, label %loop, label %end
end:
; CHECK: PHI %phi3 has values:
; CHECK-DAG: i32 0
; CHECK-DAG: i32 1
; CHECK-DAG: i32 2
%phi3 = phi i32 [ 2, %entry ], [ %phi2, %then ]
ret void
}
; CHECK-LABEL: PHI Values for function: strange_loop
define void @strange_loop() {
entry:
br i1 undef, label %ifelse, label %inloop
loop:
; CHECK: PHI %phi1 has values:
; CHECK-DAG: i32 0
; CHECK-DAG: i32 1
; CHECK-DAG: i32 2
; CHECK-DAG: i32 3
%phi1 = phi i32 [ %phi3, %if ], [ 0, %else ], [ %phi2, %inloop ]
br i1 undef, label %inloop, label %end
inloop:
; CHECK: PHI %phi2 has values:
; CHECK-DAG: i32 0
; CHECK-DAG: i32 1
; CHECK-DAG: i32 2
; CHECK-DAG: i32 3
%phi2 = phi i32 [ %phi1, %loop ], [ 1, %entry ]
br i1 undef, label %ifelse, label %loop
ifelse:
; CHECK: PHI %phi3 has values:
; CHECK-DAG: i32 2
; CHECK-DAG: i32 3
%phi3 = phi i32 [ 2, %entry ], [ 3, %inloop ]
br i1 undef, label %if, label %else
if:
br label %loop
else:
br label %loop
end:
ret void
}
; CHECK-LABEL: PHI Values for function: mutual_loops
define void @mutual_loops() {
entry:
br i1 undef, label %loop1, label %loop2
loop1:
; CHECK: PHI %phi1 has values:
; CHECK-DAG: 0
; CHECK-DAG: 1
; CHECK-DAG: 2
; CHECK-DAG: 3
; CHECK-DAG: 4
%phi1 = phi i32 [ 0, %entry ], [ %phi2, %loop1.then ], [ %phi3, %loop2.if ]
br i1 undef, label %loop1.if, label %loop1.else
loop1.if:
br i1 undef, label %loop1.then, label %loop2
loop1.else:
br label %loop1.then
loop1.then:
; CHECK: PHI %phi2 has values:
; CHECK-DAG: 0
; CHECK-DAG: 1
; CHECK-DAG: 2
; CHECK-DAG: 3
; CHECK-DAG: 4
%phi2 = phi i32 [ 1, %loop1.if ], [ %phi1, %loop1.else ]
br i1 undef, label %loop1, label %end
loop2:
; CHECK: PHI %phi3 has values:
; CHECK-DAG: 2
; CHECK-DAG: 3
; CHECK-DAG: 4
%phi3 = phi i32 [ 2, %entry ], [ %phi4, %loop2.then ], [ 3, %loop1.if ]
br i1 undef, label %loop2.if, label %loop2.else
loop2.if:
br i1 undef, label %loop2.then, label %loop1
loop2.else:
br label %loop2.then
loop2.then:
; CHECK: PHI %phi4 has values:
; CHECK-DAG: 2
; CHECK-DAG: 3
; CHECK-DAG: 4
%phi4 = phi i32 [ 4, %loop2.if ], [ %phi3, %loop2.else ]
br i1 undef, label %loop2, label %end
end:
; CHECK: PHI %phi5 has values:
; CHECK-DAG: 0
; CHECK-DAG: 1
; CHECK-DAG: 2
; CHECK-DAG: 3
; CHECK-DAG: 4
%phi5 = phi i32 [ %phi2, %loop1.then ], [ %phi4, %loop2.then ]
ret void
}
; CHECK-LABEL: PHI Values for function: nested_loops_several_values
define void @nested_loops_several_values() {
entry:
br label %loop1
loop1:
; CHECK: PHI %phi1 has values:
; CHECK-DAG: i32 0
; CHECK-DAG: %add
%phi1 = phi i32 [ 0, %entry ], [ %phi2, %loop2 ]
br i1 undef, label %loop2, label %end
loop2:
; CHECK: PHI %phi2 has values:
; CHECK-DAG: i32 0
; CHECK-DAG: %add
%phi2 = phi i32 [ %phi1, %loop1 ], [ %phi3, %loop3 ]
br i1 undef, label %loop3, label %loop1
loop3:
; CHECK: PHI %phi3 has values:
; CHECK-DAG: i32 0
; CHECK-DAG: %add
%phi3 = phi i32 [ %add, %loop3 ], [ %phi2, %loop2 ]
%add = add i32 %phi3, 1
br i1 undef, label %loop3, label %loop2
end:
ret void
}
; CHECK-LABEL: PHI Values for function: nested_loops_one_value
define void @nested_loops_one_value() {
entry:
br label %loop1
loop1:
; CHECK: PHI %phi1 has values:
; CHECK-DAG: i32 0
%phi1 = phi i32 [ 0, %entry ], [ %phi2, %loop2 ]
br i1 undef, label %loop2, label %end
loop2:
; CHECK: PHI %phi2 has values:
; CHECK-DAG: i32 0
%phi2 = phi i32 [ %phi1, %loop1 ], [ %phi3, %loop3 ]
br i1 undef, label %loop3, label %loop1
loop3:
; CHECK: PHI %phi3 has values:
; CHECK-DAG: i32 0
%phi3 = phi i32 [ 0, %loop3 ], [ %phi2, %loop2 ]
br i1 undef, label %loop3, label %loop2
end:
ret void
}
|