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
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -basic-aa -licm -use-dereferenceable-at-point-semantics=0 < %s | FileCheck %s
; RUN: opt -S -basic-aa -licm -use-dereferenceable-at-point-semantics=1 < %s | 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 @unknown()
declare void @init(i8* nocapture)
declare void @use(i8)
define i8 @test_sink_alloca() {
; CHECK-LABEL: @test_sink_alloca(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[A:%.*]] = alloca [32 x i8], align 1
; CHECK-NEXT: [[A_RAW:%.*]] = bitcast [32 x i8]* [[A]] to i8*
; CHECK-NEXT: call void @init(i8* [[A_RAW]])
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: call void @unknown()
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 200
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: [[ADDR_LE:%.*]] = getelementptr i8, i8* [[A_RAW]], i32 31
; CHECK-NEXT: [[RES_LE:%.*]] = load i8, i8* [[ADDR_LE]], align 1
; CHECK-NEXT: ret i8 [[RES_LE]]
;
entry:
%a = alloca [32 x i8]
%a.raw = bitcast [32 x i8]* %a to i8*
call void @init(i8* %a.raw)
br label %for.body
for.body:
%iv = phi i64 [ %iv.next, %for.body ], [ 0, %entry ]
call void @unknown() ;; may throw
%addr = getelementptr i8, i8* %a.raw, i32 31
%res = load i8, i8* %addr
%iv.next = add nuw nsw i64 %iv, 1
%exitcond = icmp eq i64 %iv.next, 200
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret i8 %res
}
define i8 @test_hoist_alloca() {
; CHECK-LABEL: @test_hoist_alloca(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[A:%.*]] = alloca [32 x i8], align 1
; CHECK-NEXT: [[A_RAW:%.*]] = bitcast [32 x i8]* [[A]] to i8*
; CHECK-NEXT: call void @init(i8* [[A_RAW]])
; CHECK-NEXT: [[ADDR:%.*]] = getelementptr i8, i8* [[A_RAW]], i32 31
; CHECK-NEXT: [[RES:%.*]] = load i8, i8* [[ADDR]], align 1
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: call void @unknown()
; CHECK-NEXT: call void @use(i8 [[RES]])
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 200
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: [[RES_LCSSA:%.*]] = phi i8 [ [[RES]], [[FOR_BODY]] ]
; CHECK-NEXT: ret i8 [[RES_LCSSA]]
;
entry:
%a = alloca [32 x i8]
%a.raw = bitcast [32 x i8]* %a to i8*
call void @init(i8* %a.raw)
br label %for.body
for.body:
%iv = phi i64 [ %iv.next, %for.body ], [ 0, %entry ]
call void @unknown() ;; may throw
%addr = getelementptr i8, i8* %a.raw, i32 31
%res = load i8, i8* %addr
call void @use(i8 %res)
%iv.next = add nuw nsw i64 %iv, 1
%exitcond = icmp eq i64 %iv.next, 200
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret i8 %res
}
; The attributes listed here are a) inferred by -O3 from the names
; and b) required for a standalone test. We're very inconsistent about
; which decisions we drive from TLI vs assume attributes have been infered.
declare void @free(i8* nocapture)
declare noalias i8* @malloc(i64)
define i8 @test_sink_malloc() {
; CHECK-LABEL: @test_sink_malloc(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[A_RAW:%.*]] = call nonnull i8* @malloc(i64 32)
; CHECK-NEXT: call void @init(i8* [[A_RAW]])
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: call void @unknown()
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 200
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: [[ADDR_LE:%.*]] = getelementptr i8, i8* [[A_RAW]], i32 31
; CHECK-NEXT: [[RES_LE:%.*]] = load i8, i8* [[ADDR_LE]], align 1
; CHECK-NEXT: call void @free(i8* [[A_RAW]])
; CHECK-NEXT: ret i8 [[RES_LE]]
;
entry:
; Mark as nonnull to simplify test
%a.raw = call nonnull i8* @malloc(i64 32)
call void @init(i8* %a.raw)
br label %for.body
for.body:
%iv = phi i64 [ %iv.next, %for.body ], [ 0, %entry ]
call void @unknown() ;; may throw
%addr = getelementptr i8, i8* %a.raw, i32 31
%res = load i8, i8* %addr
%iv.next = add nuw nsw i64 %iv, 1
%exitcond = icmp eq i64 %iv.next, 200
br i1 %exitcond, label %for.end, label %for.body
for.end:
call void @free(i8* %a.raw)
ret i8 %res
}
; TODO: We can hoist the load in this case, but only once we have
; some form of context sensitive free analysis.
define i8 @test_hoist_malloc() {
; CHECK-LABEL: @test_hoist_malloc(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[A_RAW:%.*]] = call nonnull i8* @malloc(i64 32)
; CHECK-NEXT: call void @init(i8* [[A_RAW]])
; CHECK-NEXT: [[ADDR:%.*]] = getelementptr i8, i8* [[A_RAW]], i32 31
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: call void @unknown()
; CHECK-NEXT: [[RES:%.*]] = load i8, i8* [[ADDR]], align 1
; CHECK-NEXT: call void @use(i8 [[RES]])
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 200
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: [[RES_LCSSA:%.*]] = phi i8 [ [[RES]], [[FOR_BODY]] ]
; CHECK-NEXT: call void @free(i8* [[A_RAW]])
; CHECK-NEXT: ret i8 [[RES_LCSSA]]
;
entry:
%a.raw = call nonnull i8* @malloc(i64 32)
call void @init(i8* %a.raw)
br label %for.body
for.body:
%iv = phi i64 [ %iv.next, %for.body ], [ 0, %entry ]
call void @unknown() ;; may throw
%addr = getelementptr i8, i8* %a.raw, i32 31
%res = load i8, i8* %addr
call void @use(i8 %res)
%iv.next = add nuw nsw i64 %iv, 1
%exitcond = icmp eq i64 %iv.next, 200
br i1 %exitcond, label %for.end, label %for.body
for.end:
call void @free(i8* %a.raw)
ret i8 %res
}
define i8 @test_hoist_malloc_leak() nofree nosync {
; CHECK-LABEL: @test_hoist_malloc_leak(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[A_RAW:%.*]] = call nonnull i8* @malloc(i64 32)
; CHECK-NEXT: call void @init(i8* [[A_RAW]])
; CHECK-NEXT: [[ADDR:%.*]] = getelementptr i8, i8* [[A_RAW]], i32 31
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: call void @unknown()
; CHECK-NEXT: [[RES:%.*]] = load i8, i8* [[ADDR]], align 1
; CHECK-NEXT: call void @use(i8 [[RES]])
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 200
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: [[RES_LCSSA:%.*]] = phi i8 [ [[RES]], [[FOR_BODY]] ]
; CHECK-NEXT: ret i8 [[RES_LCSSA]]
;
entry:
%a.raw = call nonnull i8* @malloc(i64 32)
call void @init(i8* %a.raw)
br label %for.body
for.body:
%iv = phi i64 [ %iv.next, %for.body ], [ 0, %entry ]
call void @unknown() ;; may throw
%addr = getelementptr i8, i8* %a.raw, i32 31
%res = load i8, i8* %addr
call void @use(i8 %res)
%iv.next = add nuw nsw i64 %iv, 1
%exitcond = icmp eq i64 %iv.next, 200
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret i8 %res
}
; In this case, we can't hoist the load out of the loop as the memory it
; accesses may have been conditionally freed in a manner correlated with
; whether the load is reached in the loop.
define void @test_hoist_malloc_cond_free(i1 %c) {
; CHECK-LABEL: @test_hoist_malloc_cond_free(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[A_RAW:%.*]] = call nonnull i8* @malloc(i64 32)
; CHECK-NEXT: call void @init(i8* [[A_RAW]])
; CHECK-NEXT: br i1 [[C:%.*]], label [[COND_FREE:%.*]], label [[PREHEADER:%.*]]
; CHECK: cond.free:
; CHECK-NEXT: call void @free(i8* [[A_RAW]])
; CHECK-NEXT: br label [[PREHEADER]]
; CHECK: preheader:
; CHECK-NEXT: [[ADDR:%.*]] = getelementptr i8, i8* [[A_RAW]], i32 31
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ], [ 0, [[PREHEADER]] ]
; CHECK-NEXT: br i1 [[C]], label [[FOR_END:%.*]], label [[LOOP_LATCH]]
; CHECK: loop.latch:
; CHECK-NEXT: call void @unknown()
; CHECK-NEXT: [[RES:%.*]] = load i8, i8* [[ADDR]], align 1
; CHECK-NEXT: call void @use(i8 [[RES]])
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 200
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_END]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
%a.raw = call nonnull i8* @malloc(i64 32)
call void @init(i8* %a.raw)
br i1 %c, label %cond.free, label %preheader
cond.free:
call void @free(i8* %a.raw)
br label %preheader
preheader:
br label %for.body
for.body:
%iv = phi i64 [ %iv.next, %loop.latch ], [ 0, %preheader ]
br i1 %c, label %for.end, label %loop.latch
loop.latch:
call void @unknown() ;; may throw
%addr = getelementptr i8, i8* %a.raw, i32 31
%res = load i8, i8* %addr
call void @use(i8 %res)
%iv.next = add nuw nsw i64 %iv, 1
%exitcond = icmp eq i64 %iv.next, 200
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret void
}
define i8 @test_sink_malloc_cond_free(i1 %c) {
; CHECK-LABEL: @test_sink_malloc_cond_free(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[A_RAW:%.*]] = call nonnull i8* @malloc(i64 32)
; CHECK-NEXT: call void @init(i8* [[A_RAW]])
; CHECK-NEXT: br i1 [[C:%.*]], label [[COND_FREE:%.*]], label [[PREHEADER:%.*]]
; CHECK: cond.free:
; CHECK-NEXT: call void @free(i8* [[A_RAW]])
; CHECK-NEXT: br label [[PREHEADER]]
; CHECK: preheader:
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ], [ 0, [[PREHEADER]] ]
; CHECK-NEXT: br i1 [[C]], label [[FOR_END_SPLIT_LOOP_EXIT1:%.*]], label [[LOOP_LATCH]]
; CHECK: loop.latch:
; CHECK-NEXT: call void @unknown()
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 200
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_END_SPLIT_LOOP_EXIT:%.*]], label [[FOR_BODY]]
; CHECK: for.end.split.loop.exit:
; CHECK-NEXT: [[ADDR_LE:%.*]] = getelementptr i8, i8* [[A_RAW]], i32 31
; CHECK-NEXT: [[RES_LE:%.*]] = load i8, i8* [[ADDR_LE]], align 1
; CHECK-NEXT: br label [[FOR_END:%.*]]
; CHECK: for.end.split.loop.exit1:
; CHECK-NEXT: [[PHI_PH2:%.*]] = phi i8 [ 0, [[FOR_BODY]] ]
; CHECK-NEXT: br label [[FOR_END]]
; CHECK: for.end:
; CHECK-NEXT: [[PHI:%.*]] = phi i8 [ [[RES_LE]], [[FOR_END_SPLIT_LOOP_EXIT]] ], [ [[PHI_PH2]], [[FOR_END_SPLIT_LOOP_EXIT1]] ]
; CHECK-NEXT: ret i8 [[PHI]]
;
entry:
%a.raw = call nonnull i8* @malloc(i64 32)
call void @init(i8* %a.raw)
br i1 %c, label %cond.free, label %preheader
cond.free:
call void @free(i8* %a.raw)
br label %preheader
preheader:
br label %for.body
for.body:
%iv = phi i64 [ %iv.next, %loop.latch ], [ 0, %preheader ]
br i1 %c, label %for.end, label %loop.latch
loop.latch:
call void @unknown() ;; may throw
%addr = getelementptr i8, i8* %a.raw, i32 31
%res = load i8, i8* %addr
%iv.next = add nuw nsw i64 %iv, 1
%exitcond = icmp eq i64 %iv.next, 200
br i1 %exitcond, label %for.end, label %for.body
for.end:
%phi = phi i8 [%res, %loop.latch], [0, %for.body]
ret i8 %phi
}
declare noalias i8* @my_alloc(i64) allocsize(0)
; We would need context sensitive reasoning about frees (which we don't
; don't currently have) to hoist the load in this example.
define i8 @test_hoist_allocsize() {
; CHECK-LABEL: @test_hoist_allocsize(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[A_RAW:%.*]] = call nonnull i8* @my_alloc(i64 32)
; CHECK-NEXT: call void @init(i8* [[A_RAW]])
; CHECK-NEXT: [[ADDR:%.*]] = getelementptr i8, i8* [[A_RAW]], i32 31
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: call void @unknown()
; CHECK-NEXT: [[RES:%.*]] = load i8, i8* [[ADDR]], align 1
; CHECK-NEXT: call void @use(i8 [[RES]])
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 200
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: [[RES_LCSSA:%.*]] = phi i8 [ [[RES]], [[FOR_BODY]] ]
; CHECK-NEXT: call void @free(i8* [[A_RAW]])
; CHECK-NEXT: ret i8 [[RES_LCSSA]]
;
entry:
%a.raw = call nonnull i8* @my_alloc(i64 32)
call void @init(i8* %a.raw)
br label %for.body
for.body:
%iv = phi i64 [ %iv.next, %for.body ], [ 0, %entry ]
call void @unknown() ;; may throw
%addr = getelementptr i8, i8* %a.raw, i32 31
%res = load i8, i8* %addr
call void @use(i8 %res)
%iv.next = add nuw nsw i64 %iv, 1
%exitcond = icmp eq i64 %iv.next, 200
br i1 %exitcond, label %for.end, label %for.body
for.end:
call void @free(i8* %a.raw)
ret i8 %res
}
define i8 @test_hoist_allocsize_leak() nofree nosync {
; CHECK-LABEL: @test_hoist_allocsize_leak(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[A_RAW:%.*]] = call nonnull i8* @my_alloc(i64 32)
; CHECK-NEXT: call void @init(i8* [[A_RAW]])
; CHECK-NEXT: [[ADDR:%.*]] = getelementptr i8, i8* [[A_RAW]], i32 31
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: call void @unknown()
; CHECK-NEXT: [[RES:%.*]] = load i8, i8* [[ADDR]], align 1
; CHECK-NEXT: call void @use(i8 [[RES]])
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 200
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: [[RES_LCSSA:%.*]] = phi i8 [ [[RES]], [[FOR_BODY]] ]
; CHECK-NEXT: ret i8 [[RES_LCSSA]]
;
entry:
%a.raw = call nonnull i8* @my_alloc(i64 32)
call void @init(i8* %a.raw)
br label %for.body
for.body:
%iv = phi i64 [ %iv.next, %for.body ], [ 0, %entry ]
call void @unknown() ;; may throw
%addr = getelementptr i8, i8* %a.raw, i32 31
%res = load i8, i8* %addr
call void @use(i8 %res)
%iv.next = add nuw nsw i64 %iv, 1
%exitcond = icmp eq i64 %iv.next, 200
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret i8 %res
}
|
