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
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
; FIXME: This is technically incorrect because it might overwrite a poison
; value. Stop folding it once #52930 is resolved.
define void @store_of_undef(ptr %P) {
; CHECK-LABEL: @store_of_undef(
; CHECK-NEXT: ret void
;
store i32 undef, ptr %P
ret void
}
define void @store_of_poison(ptr %P) {
; CHECK-LABEL: @store_of_poison(
; CHECK-NEXT: ret void
;
store i32 poison, ptr %P
ret void
}
define void @store_into_undef(ptr %P) {
; CHECK-LABEL: @store_into_undef(
; CHECK-NEXT: store i32 123, ptr undef, align 4
; CHECK-NEXT: ret void
;
store i32 123, ptr undef
ret void
}
define void @store_into_null(ptr %P) {
; CHECK-LABEL: @store_into_null(
; CHECK-NEXT: store i32 poison, ptr null, align 4294967296
; CHECK-NEXT: ret void
;
store i32 124, ptr null
ret void
}
define void @test2(ptr %P) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: ret void
;
%X = load i32, ptr %P
%Y = add i32 %X, 0
store i32 %Y, ptr %P
ret void
}
define void @store_at_gep_off_null_inbounds(i64 %offset) {
; CHECK-LABEL: @store_at_gep_off_null_inbounds(
; CHECK-NEXT: [[PTR:%.*]] = getelementptr inbounds i32, ptr null, i64 [[OFFSET:%.*]]
; CHECK-NEXT: store i32 poison, ptr [[PTR]], align 4
; CHECK-NEXT: ret void
;
%ptr = getelementptr inbounds i32, ptr null, i64 %offset
store i32 24, ptr %ptr
ret void
}
define void @store_at_gep_off_null_not_inbounds(i64 %offset) {
; CHECK-LABEL: @store_at_gep_off_null_not_inbounds(
; CHECK-NEXT: [[PTR:%.*]] = getelementptr i32, ptr null, i64 [[OFFSET:%.*]]
; CHECK-NEXT: store i32 poison, ptr [[PTR]], align 4
; CHECK-NEXT: ret void
;
%ptr = getelementptr i32, ptr null, i64 %offset
store i32 24, ptr %ptr
ret void
}
define void @store_at_gep_off_no_null_opt(i64 %offset) #0 {
; CHECK-LABEL: @store_at_gep_off_no_null_opt(
; CHECK-NEXT: [[PTR:%.*]] = getelementptr inbounds i32, ptr null, i64 [[OFFSET:%.*]]
; CHECK-NEXT: store i32 24, ptr [[PTR]], align 4
; CHECK-NEXT: ret void
;
%ptr = getelementptr inbounds i32, ptr null, i64 %offset
store i32 24, ptr %ptr
ret void
}
attributes #0 = { null_pointer_is_valid }
;; Simple sinking tests
; "if then else"
define i32 @test3(i1 %C) {
; CHECK-LABEL: @test3(
; CHECK-NEXT: br i1 [[C:%.*]], label [[COND:%.*]], label [[COND2:%.*]]
; CHECK: Cond:
; CHECK-NEXT: br label [[CONT:%.*]]
; CHECK: Cond2:
; CHECK-NEXT: br label [[CONT]]
; CHECK: Cont:
; CHECK-NEXT: [[STOREMERGE:%.*]] = phi i32 [ 47, [[COND2]] ], [ -987654321, [[COND]] ]
; CHECK-NEXT: ret i32 [[STOREMERGE]]
;
%A = alloca i32
br i1 %C, label %Cond, label %Cond2
Cond:
store i32 -987654321, ptr %A
br label %Cont
Cond2:
store i32 47, ptr %A
br label %Cont
Cont:
%V = load i32, ptr %A
ret i32 %V
}
; "if then"
define i32 @test4(i1 %C) {
; CHECK-LABEL: @test4(
; CHECK-NEXT: br i1 [[C:%.*]], label [[COND:%.*]], label [[CONT:%.*]]
; CHECK: Cond:
; CHECK-NEXT: br label [[CONT]]
; CHECK: Cont:
; CHECK-NEXT: [[STOREMERGE:%.*]] = phi i32 [ -987654321, [[COND]] ], [ 47, [[TMP0:%.*]] ]
; CHECK-NEXT: ret i32 [[STOREMERGE]]
;
%A = alloca i32
store i32 47, ptr %A
br i1 %C, label %Cond, label %Cont
Cond:
store i32 -987654321, ptr %A
br label %Cont
Cont:
%V = load i32, ptr %A
ret i32 %V
}
; "if then"
define void @test5(i1 %C, ptr %P) {
; CHECK-LABEL: @test5(
; CHECK-NEXT: br i1 [[C:%.*]], label [[COND:%.*]], label [[CONT:%.*]]
; CHECK: Cond:
; CHECK-NEXT: br label [[CONT]]
; CHECK: Cont:
; CHECK-NEXT: [[STOREMERGE:%.*]] = phi i32 [ -987654321, [[COND]] ], [ 47, [[TMP0:%.*]] ]
; CHECK-NEXT: store i32 [[STOREMERGE]], ptr [[P:%.*]], align 1
; CHECK-NEXT: ret void
;
store i32 47, ptr %P, align 1
br i1 %C, label %Cond, label %Cont
Cond:
store i32 -987654321, ptr %P, align 1
br label %Cont
Cont:
ret void
}
; PR14753 - merging two stores should preserve the TBAA tag.
define void @test6(i32 %n, ptr %a, ptr %gi) nounwind uwtable ssp {
; CHECK-LABEL: @test6(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
; CHECK-NEXT: [[STOREMERGE:%.*]] = phi i32 [ 42, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[FOR_BODY:%.*]] ]
; CHECK-NEXT: store i32 [[STOREMERGE]], ptr [[GI:%.*]], align 4, !tbaa [[TBAA0:![0-9]+]]
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[STOREMERGE]], [[N:%.*]]
; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_END:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[IDXPROM:%.*]] = sext i32 [[STOREMERGE]] to i64
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds float, ptr [[A:%.*]], i64 [[IDXPROM]]
; CHECK-NEXT: store float 0.000000e+00, ptr [[ARRAYIDX]], align 4, !tbaa [[TBAA4:![0-9]+]]
; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[GI]], align 4, !tbaa [[TBAA0]]
; CHECK-NEXT: [[INC]] = add nsw i32 [[TMP0]], 1
; CHECK-NEXT: br label [[FOR_COND]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
store i32 42, ptr %gi, align 4, !tbaa !0
br label %for.cond
for.cond:
%storemerge = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%0 = load i32, ptr %gi, align 4, !tbaa !0
%cmp = icmp slt i32 %0, %n
br i1 %cmp, label %for.body, label %for.end
for.body:
%idxprom = sext i32 %0 to i64
%arrayidx = getelementptr inbounds float, ptr %a, i64 %idxprom
store float 0.000000e+00, ptr %arrayidx, align 4, !tbaa !3
%1 = load i32, ptr %gi, align 4, !tbaa !0
%inc = add nsw i32 %1, 1
store i32 %inc, ptr %gi, align 4, !tbaa !0
br label %for.cond
for.end:
ret void
}
define void @dse1(ptr %p) {
; CHECK-LABEL: @dse1(
; CHECK-NEXT: store i32 0, ptr [[P:%.*]], align 4
; CHECK-NEXT: ret void
;
store i32 0, ptr %p
store i32 0, ptr %p
ret void
}
; Slightly subtle: if we're mixing atomic and non-atomic access to the
; same location, then the contents of the location are undefined if there's
; an actual race. As such, we're free to pick either store under the
; assumption that we're not racing with any other thread.
define void @dse2(ptr %p) {
; CHECK-LABEL: @dse2(
; CHECK-NEXT: store i32 0, ptr [[P:%.*]], align 4
; CHECK-NEXT: ret void
;
store atomic i32 0, ptr %p unordered, align 4
store i32 0, ptr %p
ret void
}
define void @dse3(ptr %p) {
; CHECK-LABEL: @dse3(
; CHECK-NEXT: store atomic i32 0, ptr [[P:%.*]] unordered, align 4
; CHECK-NEXT: ret void
;
store i32 0, ptr %p
store atomic i32 0, ptr %p unordered, align 4
ret void
}
define void @dse4(ptr %p) {
; CHECK-LABEL: @dse4(
; CHECK-NEXT: store atomic i32 0, ptr [[P:%.*]] unordered, align 4
; CHECK-NEXT: ret void
;
store atomic i32 0, ptr %p unordered, align 4
store atomic i32 0, ptr %p unordered, align 4
ret void
}
; Implementation limit - could remove unordered store here, but
; currently don't.
define void @dse5(ptr %p) {
; CHECK-LABEL: @dse5(
; CHECK-NEXT: store atomic i32 0, ptr [[P:%.*]] unordered, align 4
; CHECK-NEXT: store atomic i32 0, ptr [[P]] seq_cst, align 4
; CHECK-NEXT: ret void
;
store atomic i32 0, ptr %p unordered, align 4
store atomic i32 0, ptr %p seq_cst, align 4
ret void
}
define void @write_back1(ptr %p) {
; CHECK-LABEL: @write_back1(
; CHECK-NEXT: ret void
;
%v = load i32, ptr %p
store i32 %v, ptr %p
ret void
}
define void @write_back2(ptr %p) {
; CHECK-LABEL: @write_back2(
; CHECK-NEXT: ret void
;
%v = load atomic i32, ptr %p unordered, align 4
store i32 %v, ptr %p
ret void
}
define void @write_back3(ptr %p) {
; CHECK-LABEL: @write_back3(
; CHECK-NEXT: ret void
;
%v = load i32, ptr %p
store atomic i32 %v, ptr %p unordered, align 4
ret void
}
define void @write_back4(ptr %p) {
; CHECK-LABEL: @write_back4(
; CHECK-NEXT: ret void
;
%v = load atomic i32, ptr %p unordered, align 4
store atomic i32 %v, ptr %p unordered, align 4
ret void
}
; Can't remove store due to ordering side effect
define void @write_back5(ptr %p) {
; CHECK-LABEL: @write_back5(
; CHECK-NEXT: [[V:%.*]] = load atomic i32, ptr [[P:%.*]] unordered, align 4
; CHECK-NEXT: store atomic i32 [[V]], ptr [[P]] seq_cst, align 4
; CHECK-NEXT: ret void
;
%v = load atomic i32, ptr %p unordered, align 4
store atomic i32 %v, ptr %p seq_cst, align 4
ret void
}
define void @write_back6(ptr %p) {
; CHECK-LABEL: @write_back6(
; CHECK-NEXT: [[V:%.*]] = load atomic i32, ptr [[P:%.*]] seq_cst, align 4
; CHECK-NEXT: ret void
;
%v = load atomic i32, ptr %p seq_cst, align 4
store atomic i32 %v, ptr %p unordered, align 4
ret void
}
define void @write_back7(ptr %p) {
; CHECK-LABEL: @write_back7(
; CHECK-NEXT: [[V:%.*]] = load atomic volatile i32, ptr [[P:%.*]] seq_cst, align 4
; CHECK-NEXT: ret void
;
%v = load atomic volatile i32, ptr %p seq_cst, align 4
store atomic i32 %v, ptr %p unordered, align 4
ret void
}
@Unknown = external constant i32
define void @store_to_constant() {
; CHECK-LABEL: @store_to_constant(
; CHECK-NEXT: ret void
;
store i32 0, ptr @Unknown
ret void
}
; Delete stores to readonly noalias pointers.
define void @store_to_readonly_noalias(ptr readonly noalias %0) {
; CHECK-LABEL: @store_to_readonly_noalias(
; CHECK-NEXT: ret void
;
store i32 3, ptr %0, align 4
ret void
}
!0 = !{!4, !4, i64 0}
!1 = !{!"omnipotent char", !2}
!2 = !{!"Simple C/C++ TBAA"}
!3 = !{!"float", !1}
!4 = !{!"int", !1}
|
