noalias-ptr.ll
7.65 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
; RUN: opt -instsimplify -S < %s | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@g1 = global i32 0, align 4
@g2 = internal global i32 0, align 4
@g3 = unnamed_addr global i32 0, align 4
@g4 = hidden global i32 0, align 4
@g5 = protected global i32 0, align 4
@g6 = thread_local unnamed_addr global i32 0, align 4
; Make sure we can simplify away a pointer comparison between
; dynamically-allocated memory and a local stack allocation.
; void p()
; {
; int *mData;
; int mStackData[10];
; mData = new int[12];
; if (mData != mStackData) {
; delete[] mData;
; }
; }
define void @_Z2p1v() #0 {
%mStackData = alloca [10 x i32], align 16
%1 = bitcast [10 x i32]* %mStackData to i8*
%2 = tail call noalias i8* @_Znam(i64 48) #4
%3 = bitcast i8* %2 to i32*
%4 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
%5 = icmp eq i32* %3, %4
br i1 %5, label %7, label %6
; CHECK-LABEL: @_Z2p1v
; CHECK-NOT: icmp
; CHECK: ret void
; <label>:6 ; preds = %0
call void @_ZdaPv(i8* %2) #5
br label %7
; <label>:7 ; preds = %0, %6
ret void
}
; Also check a more-complicated case with multiple underlying objects.
define void @_Z2p2bb(i1 zeroext %b1, i1 zeroext %b2) #0 {
%mStackData = alloca [10 x i32], align 16
%1 = bitcast [10 x i32]* %mStackData to i8*
%2 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
%3 = select i1 %b1, i32* %2, i32* @g2
%4 = tail call noalias i8* @_Znam(i64 48) #4
%5 = tail call noalias i8* @_Znam(i64 48) #4
%.v = select i1 %b2, i8* %4, i8* %5
%6 = bitcast i8* %.v to i32*
%7 = icmp eq i32* %6, %3
br i1 %7, label %9, label %8
; CHECK-LABEL: @_Z2p2bb
; CHECK-NOT: icmp
; CHECK: ret void
; <label>:8 ; preds = %0
call void @_ZdaPv(i8* %4) #5
call void @_ZdaPv(i8* %5) #5
br label %9
; <label>:9 ; preds = %0, %8
ret void
}
define void @_Z2p4bb(i1 zeroext %b1, i1 zeroext %b2) #0 {
%mStackData = alloca [10 x i32], align 16
%1 = bitcast [10 x i32]* %mStackData to i8*
%2 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
%3 = select i1 %b1, i32* %2, i32* @g3
%4 = tail call noalias i8* @_Znam(i64 48) #4
%5 = tail call noalias i8* @_Znam(i64 48) #4
%.v = select i1 %b2, i8* %4, i8* %5
%6 = bitcast i8* %.v to i32*
%7 = icmp eq i32* %6, %3
br i1 %7, label %9, label %8
; CHECK-LABEL: @_Z2p4bb
; CHECK-NOT: icmp
; CHECK: ret void
; <label>:8 ; preds = %0
call void @_ZdaPv(i8* %4) #5
call void @_ZdaPv(i8* %5) #5
br label %9
; <label>:9 ; preds = %0, %8
ret void
}
define void @_Z2p5bb(i1 zeroext %b1, i1 zeroext %b2) #0 {
%mStackData = alloca [10 x i32], align 16
%1 = bitcast [10 x i32]* %mStackData to i8*
%2 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
%3 = select i1 %b1, i32* %2, i32* @g4
%4 = tail call noalias i8* @_Znam(i64 48) #4
%5 = tail call noalias i8* @_Znam(i64 48) #4
%.v = select i1 %b2, i8* %4, i8* %5
%6 = bitcast i8* %.v to i32*
%7 = icmp eq i32* %6, %3
br i1 %7, label %9, label %8
; CHECK-LABEL: @_Z2p5bb
; CHECK-NOT: icmp
; CHECK: ret void
; <label>:8 ; preds = %0
call void @_ZdaPv(i8* %4) #5
call void @_ZdaPv(i8* %5) #5
br label %9
; <label>:9 ; preds = %0, %8
ret void
}
define void @_Z2p6bb(i1 zeroext %b1, i1 zeroext %b2) #0 {
%mStackData = alloca [10 x i32], align 16
%1 = bitcast [10 x i32]* %mStackData to i8*
%2 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
%3 = select i1 %b1, i32* %2, i32* @g5
%4 = tail call noalias i8* @_Znam(i64 48) #4
%5 = tail call noalias i8* @_Znam(i64 48) #4
%.v = select i1 %b2, i8* %4, i8* %5
%6 = bitcast i8* %.v to i32*
%7 = icmp eq i32* %6, %3
br i1 %7, label %9, label %8
; CHECK-LABEL: @_Z2p6bb
; CHECK-NOT: icmp
; CHECK: ret void
; <label>:8 ; preds = %0
call void @_ZdaPv(i8* %4) #5
call void @_ZdaPv(i8* %5) #5
br label %9
; <label>:9 ; preds = %0, %8
ret void
}
; Here's another case involving multiple underlying objects, but this time we
; must keep the comparison (it might involve a regular pointer-typed function
; argument).
define void @_Z4nopebbPi(i1 zeroext %b1, i1 zeroext %b2, i32* readnone %q) #0 {
%mStackData = alloca [10 x i32], align 16
%1 = bitcast [10 x i32]* %mStackData to i8*
%2 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
%3 = select i1 %b1, i32* %2, i32* %q
%4 = tail call noalias i8* @_Znam(i64 48) #4
%5 = tail call noalias i8* @_Znam(i64 48) #4
%.v = select i1 %b2, i8* %4, i8* %5
%6 = bitcast i8* %.v to i32*
%7 = icmp eq i32* %6, %3
br i1 %7, label %9, label %8
; CHECK-LABEL: @_Z4nopebbPi
; CHECK: icmp
; CHECK: ret void
; <label>:8 ; preds = %0
call void @_ZdaPv(i8* %4) #5
call void @_ZdaPv(i8* %5) #5
br label %9
; <label>:9 ; preds = %0, %8
ret void
}
define void @_Z2p3bb(i1 zeroext %b1, i1 zeroext %b2) #0 {
%mStackData = alloca [10 x i32], align 16
%1 = bitcast [10 x i32]* %mStackData to i8*
%2 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
%3 = select i1 %b1, i32* %2, i32* @g1
%4 = tail call noalias i8* @_Znam(i64 48) #4
%5 = tail call noalias i8* @_Znam(i64 48) #4
%.v = select i1 %b2, i8* %4, i8* %5
%6 = bitcast i8* %.v to i32*
%7 = icmp eq i32* %6, %3
br i1 %7, label %9, label %8
; CHECK-LABEL: @_Z2p3bb
; CHECK: icmp
; CHECK: ret void
; <label>:8 ; preds = %0
call void @_ZdaPv(i8* %4) #5
call void @_ZdaPv(i8* %5) #5
br label %9
; <label>:9 ; preds = %0, %8
ret void
}
define void @_Z2p7bb(i1 zeroext %b1, i1 zeroext %b2) #0 {
%mStackData = alloca [10 x i32], align 16
%1 = bitcast [10 x i32]* %mStackData to i8*
%2 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
%3 = select i1 %b1, i32* %2, i32* @g6
%4 = tail call noalias i8* @_Znam(i64 48) #4
%5 = tail call noalias i8* @_Znam(i64 48) #4
%.v = select i1 %b2, i8* %4, i8* %5
%6 = bitcast i8* %.v to i32*
%7 = icmp eq i32* %6, %3
br i1 %7, label %9, label %8
; CHECK-LABEL: @_Z2p7bb
; CHECK: icmp
; CHECK: ret void
; <label>:8 ; preds = %0
call void @_ZdaPv(i8* %4) #5
call void @_ZdaPv(i8* %5) #5
br label %9
; <label>:9 ; preds = %0, %8
ret void
}
define void @_Z2p2v(i32 %c) #0 {
%mStackData = alloca [10 x i32], i32 %c, align 16
%1 = bitcast [10 x i32]* %mStackData to i8*
%2 = tail call noalias i8* @_Znam(i64 48) #4
%3 = bitcast i8* %2 to i32*
%4 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
%5 = icmp eq i32* %3, %4
br i1 %5, label %7, label %6
; CHECK-LABEL: @_Z2p2v
; CHECK: icmp
; CHECK: ret void
; <label>:6 ; preds = %0
call void @_ZdaPv(i8* %2) #5
br label %7
; <label>:7 ; preds = %0, %6
ret void
}
; Function Attrs: nobuiltin
declare noalias i8* @_Znam(i64) #2
; Function Attrs: nobuiltin nounwind
declare void @_ZdaPv(i8*) #3
attributes #0 = { uwtable }
attributes #1 = { nounwind }
attributes #2 = { nobuiltin }
attributes #3 = { nobuiltin nounwind }
attributes #4 = { builtin }
attributes #5 = { builtin nounwind }