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
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 < %s | FileCheck %s
; SimplifyCFG should eliminate redundant indirectbr edges.
declare void @foo()
declare void @A()
declare void @B(i32)
declare void @C()
define void @indbrtest0(ptr %P, ptr %Q) {
; CHECK-LABEL: @indbrtest0(
; CHECK-NEXT: entry:
; CHECK-NEXT: store ptr blockaddress(@indbrtest0, [[BB0:%.*]]), ptr [[P:%.*]], align 8
; CHECK-NEXT: store ptr blockaddress(@indbrtest0, [[BB1:%.*]]), ptr [[P]], align 8
; CHECK-NEXT: store ptr blockaddress(@indbrtest0, [[BB2:%.*]]), ptr [[P]], align 8
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: [[T:%.*]] = load ptr, ptr [[Q:%.*]], align 8
; CHECK-NEXT: indirectbr ptr [[T]], [label [[BB0]], label [[BB1]], label %BB2]
; CHECK: BB0:
; CHECK-NEXT: call void @A()
; CHECK-NEXT: br label [[BB1]]
; CHECK: common.ret:
; CHECK-NEXT: ret void
; CHECK: BB1:
; CHECK-NEXT: [[X:%.*]] = phi i32 [ 0, [[BB0]] ], [ 1, [[ENTRY:%.*]] ]
; CHECK-NEXT: call void @B(i32 [[X]])
; CHECK-NEXT: br label [[COMMON_RET:%.*]]
; CHECK: BB2:
; CHECK-NEXT: call void @C()
; CHECK-NEXT: br label [[COMMON_RET]]
;
entry:
store ptr blockaddress(@indbrtest0, %BB0), ptr %P
store ptr blockaddress(@indbrtest0, %BB1), ptr %P
store ptr blockaddress(@indbrtest0, %BB2), ptr %P
call void @foo()
%t = load ptr, ptr %Q
indirectbr ptr %t, [label %BB0, label %BB1, label %BB2, label %BB0, label %BB1, label %BB2]
BB0:
call void @A()
br label %BB1
BB1:
%x = phi i32 [ 0, %BB0 ], [ 1, %entry ], [ 1, %entry ]
call void @B(i32 %x)
ret void
BB2:
call void @C()
ret void
}
; SimplifyCFG should convert the indirectbr into a directbr. It would be even
; better if it removed the branch altogether, but simplifycfdg currently misses
; that because the predecessor is the entry block.
define void @indbrtest1(ptr %P, ptr %Q) {
; CHECK-LABEL: @indbrtest1(
; CHECK-NEXT: entry:
; CHECK-NEXT: store ptr blockaddress(@indbrtest1, [[BB0:%.*]]), ptr [[P:%.*]], align 8
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: br label [[BB0]]
; CHECK: BB0:
; CHECK-NEXT: call void @A()
; CHECK-NEXT: ret void
;
entry:
store ptr blockaddress(@indbrtest1, %BB0), ptr %P
call void @foo()
%t = load ptr, ptr %Q
indirectbr ptr %t, [label %BB0, label %BB0]
BB0:
call void @A()
ret void
}
; SimplifyCFG should notice that BB0 does not have its address taken and
; remove it from entry's successor list.
define void @indbrtest2(ptr %t) {
; CHECK-LABEL: @indbrtest2(
; CHECK-NEXT: entry:
; CHECK-NEXT: unreachable
;
entry:
indirectbr ptr %t, [label %BB0, label %BB0]
BB0:
ret void
}
; Make sure the blocks in the next few tests aren't trivially removable as
; successors by taking their addresses.
@anchor = constant [13 x ptr] [
ptr blockaddress(@indbrtest3, %L1), ptr blockaddress(@indbrtest3, %L2), ptr blockaddress(@indbrtest3, %L3),
ptr blockaddress(@indbrtest4, %L1), ptr blockaddress(@indbrtest4, %L2), ptr blockaddress(@indbrtest4, %L3),
ptr blockaddress(@indbrtest5, %L1), ptr blockaddress(@indbrtest5, %L2), ptr blockaddress(@indbrtest5, %L3), ptr blockaddress(@indbrtest5, %L4),
ptr blockaddress(@indbrtest6, %L1), ptr blockaddress(@indbrtest6, %L2), ptr blockaddress(@indbrtest6, %L3)
]
; SimplifyCFG should turn the indirectbr into a conditional branch on the
; condition of the select.
define void @indbrtest3(i1 %cond, ptr %address) nounwind {
; CHECK-LABEL: @indbrtest3(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[COND:%.*]], label [[L1:%.*]], label [[L2:%.*]]
; CHECK: common.ret:
; CHECK-NEXT: ret void
; CHECK: L1:
; CHECK-NEXT: call void @A()
; CHECK-NEXT: br label [[COMMON_RET:%.*]]
; CHECK: L2:
; CHECK-NEXT: call void @C()
; CHECK-NEXT: br label [[COMMON_RET]]
;
entry:
%indirect.goto.dest = select i1 %cond, ptr blockaddress(@indbrtest3, %L1), ptr blockaddress(@indbrtest3, %L2)
indirectbr ptr %indirect.goto.dest, [label %L1, label %L2, label %L3]
L1:
call void @A()
ret void
L2:
call void @C()
ret void
L3:
call void @foo()
ret void
}
; SimplifyCFG should turn the indirectbr into an unconditional branch to the
; only possible destination.
; As in @indbrtest1, it should really remove the branch entirely, but it doesn't
; because it's in the entry block.
define void @indbrtest4(i1 %cond) nounwind {
; CHECK-LABEL: @indbrtest4(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[L1:%.*]]
; CHECK: L1:
; CHECK-NEXT: call void @A()
; CHECK-NEXT: ret void
;
entry:
%indirect.goto.dest = select i1 %cond, ptr blockaddress(@indbrtest4, %L1), ptr blockaddress(@indbrtest4, %L1)
indirectbr ptr %indirect.goto.dest, [label %L1, label %L2, label %L3]
L1:
call void @A()
ret void
L2:
call void @C()
ret void
L3:
call void @foo()
ret void
}
; SimplifyCFG should turn the indirectbr into an unreachable because neither
; destination is listed as a successor.
define void @indbrtest5(i1 %cond, ptr %anchor) nounwind {
; CHECK-LABEL: @indbrtest5(
; CHECK-NEXT: entry:
; CHECK-NEXT: unreachable
;
entry:
%indirect.goto.dest = select i1 %cond, ptr blockaddress(@indbrtest5, %L1), ptr blockaddress(@indbrtest5, %L2)
; This needs to have more than one successor for this test, otherwise it gets
; replaced with an unconditional branch to the single successor.
indirectbr ptr %indirect.goto.dest, [label %L3, label %L4]
L1:
call void @A()
ret void
L2:
call void @C()
ret void
L3:
call void @foo()
ret void
L4:
call void @foo()
; This keeps blockaddresses not otherwise listed as successors from being zapped
; before SimplifyCFG even looks at the indirectbr.
indirectbr ptr %anchor, [label %L1, label %L2]
}
; The same as above, except the selected addresses are equal.
define void @indbrtest6(i1 %cond, ptr %anchor) nounwind {
; CHECK-LABEL: @indbrtest6(
; CHECK-NEXT: entry:
; CHECK-NEXT: unreachable
;
entry:
%indirect.goto.dest = select i1 %cond, ptr blockaddress(@indbrtest6, %L1), ptr blockaddress(@indbrtest6, %L1)
; This needs to have more than one successor for this test, otherwise it gets
; replaced with an unconditional branch to the single successor.
indirectbr ptr %indirect.goto.dest, [label %L2, label %L3]
L1:
call void @A()
ret void
L2:
call void @C()
ret void
L3:
call void @foo()
; This keeps blockaddresses not otherwise listed as successors from being zapped
; before SimplifyCFG even looks at the indirectbr.
indirectbr ptr %anchor, [label %L1, label %L2]
}
; PR10072
@xblkx.bbs = internal unnamed_addr constant [9 x ptr] [ptr blockaddress(@indbrtest7, %xblkx.begin), ptr blockaddress(@indbrtest7, %xblkx.begin3), ptr blockaddress(@indbrtest7, %xblkx.begin4), ptr blockaddress(@indbrtest7, %xblkx.begin5), ptr blockaddress(@indbrtest7, %xblkx.begin6), ptr blockaddress(@indbrtest7, %xblkx.begin7), ptr blockaddress(@indbrtest7, %xblkx.begin8), ptr blockaddress(@indbrtest7, %xblkx.begin9), ptr blockaddress(@indbrtest7, %xblkx.end)]
define void @indbrtest7() {
; CHECK-LABEL: @indbrtest7(
; CHECK-NEXT: escape-string.top:
; CHECK-NEXT: [[XVAL202X:%.*]] = call i32 @xfunc5x()
; CHECK-NEXT: br label [[XLAB5X:%.*]]
; CHECK: xlab8x:
; CHECK-NEXT: [[XVALUEX:%.*]] = call i32 @xselectorx()
; CHECK-NEXT: [[XBLKX_X:%.*]] = getelementptr [9 x ptr], ptr @xblkx.bbs, i32 0, i32 [[XVALUEX]]
; CHECK-NEXT: [[XBLKX_LOAD:%.*]] = load ptr, ptr [[XBLKX_X]], align 8
; CHECK-NEXT: indirectbr ptr [[XBLKX_LOAD]], [label [[XLAB4X:%.*]], label %v2j]
; CHECK: v2j:
; CHECK-NEXT: [[XUNUSEDX:%.*]] = call i32 @xactionx()
; CHECK-NEXT: br label [[XLAB4X]]
; CHECK: xlab4x:
; CHECK-NEXT: [[INCR19:%.*]] = add i32 [[XVAL704X_0:%.*]], 1
; CHECK-NEXT: br label [[XLAB5X]]
; CHECK: xlab5x:
; CHECK-NEXT: [[XVAL704X_0]] = phi i32 [ 0, [[ESCAPE_STRING_TOP:%.*]] ], [ [[INCR19]], [[XLAB4X]] ]
; CHECK-NEXT: [[XVAL10X:%.*]] = icmp ult i32 [[XVAL704X_0]], [[XVAL202X]]
; CHECK-NEXT: br i1 [[XVAL10X]], label [[XLAB8X:%.*]], label [[XLAB9X:%.*]]
; CHECK: xlab9x:
; CHECK-NEXT: ret void
;
escape-string.top:
%xval202x = call i32 @xfunc5x()
br label %xlab5x
xlab8x: ; preds = %xlab5x
%xvaluex = call i32 @xselectorx()
%xblkx.x = getelementptr [9 x ptr], ptr @xblkx.bbs, i32 0, i32 %xvaluex
%xblkx.load = load ptr, ptr %xblkx.x
indirectbr ptr %xblkx.load, [label %xblkx.begin, label %xblkx.begin3, label %xblkx.begin4, label %xblkx.begin5, label %xblkx.begin6, label %xblkx.begin7, label %xblkx.begin8, label %xblkx.begin9, label %xblkx.end]
xblkx.begin:
br label %xblkx.end
xblkx.begin3:
br label %xblkx.end
xblkx.begin4:
br label %xblkx.end
xblkx.begin5:
br label %xblkx.end
xblkx.begin6:
br label %xblkx.end
xblkx.begin7:
br label %xblkx.end
xblkx.begin8:
br label %xblkx.end
xblkx.begin9:
br label %xblkx.end
xblkx.end:
%yes.0 = phi i1 [ false, %xblkx.begin ], [ true, %xlab8x ], [ false, %xblkx.begin9 ], [ false, %xblkx.begin8 ], [ false, %xblkx.begin7 ], [ false, %xblkx.begin6 ], [ false, %xblkx.begin5 ], [ true, %xblkx.begin4 ], [ false, %xblkx.begin3 ]
br i1 %yes.0, label %v2j, label %xlab17x
v2j:
%xunusedx = call i32 @xactionx()
br label %xlab4x
xlab17x:
br label %xlab4x
xlab4x:
%incr19 = add i32 %xval704x.0, 1
br label %xlab5x
xlab5x:
%xval704x.0 = phi i32 [ 0, %escape-string.top ], [ %incr19, %xlab4x ]
%xval10x = icmp ult i32 %xval704x.0, %xval202x
br i1 %xval10x, label %xlab8x, label %xlab9x
xlab9x:
ret void
}
define void @indbrtest8() {
; CHECK-LABEL: @indbrtest8(
; CHECK-NEXT: entry:
; CHECK-NEXT: call void @B(i32 undef)
; CHECK-NEXT: ret void
;
entry:
indirectbr ptr blockaddress(@indbrtest8, %BB1), [label %BB0, label %BB1]
BB0:
call void @A()
ret void
BB1:
call void @B(i32 undef)
ret void
}
define void @indbrtest9() {
; CHECK-LABEL: @indbrtest9(
; CHECK-NEXT: entry:
; CHECK-NEXT: unreachable
;
entry:
indirectbr ptr blockaddress(@indbrtest9, %BB1), [label %BB0]
BB0:
call void @A()
ret void
BB1:
call void @B(i32 undef)
ret void
}
define void @indbrtest10() {
; CHECK-LABEL: @indbrtest10(
; CHECK-NEXT: entry:
; CHECK-NEXT: call void @B(i32 undef)
; CHECK-NEXT: ret void
;
entry:
indirectbr ptr blockaddress(@indbrtest10, %BB1), [label %BB1]
BB0:
call void @A()
ret void
BB1:
call void @B(i32 undef)
ret void
}
define void @indbrtest11() {
; CHECK-LABEL: @indbrtest11(
; CHECK-NEXT: entry:
; CHECK-NEXT: call void @A()
; CHECK-NEXT: ret void
;
entry:
indirectbr ptr blockaddress(@indbrtest11, %BB0), [label %BB0, label %BB1, label %BB1]
BB0:
call void @A()
ret void
BB1:
call void @B(i32 undef)
ret void
}
define void @indbrtest12() {
; CHECK-LABEL: @indbrtest12(
; CHECK-NEXT: entry:
; CHECK-NEXT: call void @B(i32 undef)
; CHECK-NEXT: ret void
;
entry:
indirectbr ptr blockaddress(@indbrtest12, %BB1), [label %BB0, label %BB1, label %BB1]
BB0:
call void @A()
ret void
BB1:
call void @B(i32 undef)
ret void
}
declare i32 @xfunc5x()
declare i8 @xfunc7x()
declare i32 @xselectorx()
declare i32 @xactionx()
|
