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
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=constraint-elimination -S %s | FileCheck %s
declare void @may_unwind()
define i1 @test_switch_in_block_with_assume(i8 %x) {
; CHECK-LABEL: @test_switch_in_block_with_assume(
; CHECK-NEXT: entry:
; CHECK-NEXT: call void @may_unwind()
; CHECK-NEXT: [[C_1:%.*]] = icmp ult i8 [[X:%.*]], 10
; CHECK-NEXT: call void @llvm.assume(i1 [[C_1]])
; CHECK-NEXT: switch i8 0, label [[EXIT_1:%.*]] [
; CHECK-NEXT: i8 1, label [[EXIT_2:%.*]]
; CHECK-NEXT: ]
; CHECK: exit.1:
; CHECK-NEXT: [[C_2:%.*]] = icmp ult i8 [[X]], 9
; CHECK-NEXT: [[RES_1:%.*]] = xor i1 true, [[C_2]]
; CHECK-NEXT: ret i1 [[RES_1]]
; CHECK: exit.2:
; CHECK-NEXT: [[C_3:%.*]] = icmp ult i8 [[X]], 9
; CHECK-NEXT: [[RES_2:%.*]] = xor i1 true, [[C_3]]
; CHECK-NEXT: ret i1 [[RES_2]]
;
entry:
call void @may_unwind()
%c.1 = icmp ult i8 %x, 10
call void @llvm.assume(i1 %c.1)
switch i8 0, label %exit.1 [
i8 1, label %exit.2
]
exit.1:
%t.1 = icmp ult i8 %x, 10
%c.2 = icmp ult i8 %x, 9
%res.1 = xor i1 %t.1, %c.2
ret i1 %res.1
exit.2:
%t.2 = icmp ult i8 %x, 10
%c.3 = icmp ult i8 %x, 9
%res.2 = xor i1 %t.2, %c.3
ret i1 %res.2
}
declare void @llvm.assume(i1)
define i1 @simplify_based_on_switch(i8 %x) {
; CHECK-LABEL: @simplify_based_on_switch(
; CHECK-NEXT: entry:
; CHECK-NEXT: switch i8 [[X:%.*]], label [[EXIT_1:%.*]] [
; CHECK-NEXT: i8 6, label [[EXIT_2:%.*]]
; CHECK-NEXT: i8 10, label [[EXIT_3:%.*]]
; CHECK-NEXT: ]
; CHECK: exit.1:
; CHECK-NEXT: [[C_1:%.*]] = icmp ult i8 [[X]], 7
; CHECK-NEXT: [[C_2:%.*]] = icmp ult i8 [[X]], 6
; CHECK-NEXT: [[RES_1:%.*]] = xor i1 [[C_1]], [[C_2]]
; CHECK-NEXT: ret i1 [[RES_1]]
; CHECK: exit.2:
; CHECK-NEXT: [[RES_2:%.*]] = xor i1 true, false
; CHECK-NEXT: ret i1 [[RES_2]]
; CHECK: exit.3:
; CHECK-NEXT: [[RES_3:%.*]] = xor i1 true, false
; CHECK-NEXT: ret i1 [[RES_3]]
;
entry:
switch i8 %x, label %exit.1 [
i8 6, label %exit.2
i8 10, label %exit.3
]
exit.1:
%c.1 = icmp ult i8 %x, 7
%c.2 = icmp ult i8 %x, 6
%res.1 = xor i1 %c.1, %c.2
ret i1 %res.1
exit.2:
%t.1 = icmp ult i8 %x, 7
%f.1 = icmp ult i8 %x, 6
%res.2 = xor i1 %t.1, %f.1
ret i1 %res.2
exit.3:
%t.2 = icmp ult i8 %x, 11
%f.2 = icmp ult i8 %x, 10
%res.3 = xor i1 %t.2, %f.2
ret i1 %res.3
}
define i1 @simplify_based_on_switch_successor_branches(i8 %x) {
; CHECK-LABEL: @simplify_based_on_switch_successor_branches(
; CHECK-NEXT: entry:
; CHECK-NEXT: switch i8 [[X:%.*]], label [[EXIT_1:%.*]] [
; CHECK-NEXT: i8 6, label [[EXIT_2:%.*]]
; CHECK-NEXT: i8 10, label [[EXIT_3:%.*]]
; CHECK-NEXT: ]
; CHECK: exit.1:
; CHECK-NEXT: [[C_1:%.*]] = icmp ult i8 [[X]], 7
; CHECK-NEXT: [[C_2:%.*]] = icmp ult i8 [[X]], 6
; CHECK-NEXT: [[RES_1:%.*]] = xor i1 [[C_1]], [[C_2]]
; CHECK-NEXT: ret i1 [[RES_1]]
; CHECK: exit.2:
; CHECK-NEXT: [[RES_2:%.*]] = xor i1 true, false
; CHECK-NEXT: call void @use(i1 [[RES_2]])
; CHECK-NEXT: br label [[EXIT_3]]
; CHECK: exit.3:
; CHECK-NEXT: [[C_3:%.*]] = icmp ult i8 [[X]], 11
; CHECK-NEXT: [[C_4:%.*]] = icmp ult i8 [[X]], 10
; CHECK-NEXT: [[RES_3:%.*]] = xor i1 [[C_3]], [[C_4]]
; CHECK-NEXT: ret i1 [[RES_3]]
;
entry:
switch i8 %x, label %exit.1 [
i8 6, label %exit.2
i8 10, label %exit.3
]
exit.1:
%c.1 = icmp ult i8 %x, 7
%c.2 = icmp ult i8 %x, 6
%res.1 = xor i1 %c.1, %c.2
ret i1 %res.1
exit.2:
%t.1 = icmp ult i8 %x, 7
%f.1 = icmp ult i8 %x, 6
%res.2 = xor i1 %t.1, %f.1
call void @use(i1 %res.2)
br label %exit.3
exit.3:
%c.3 = icmp ult i8 %x, 11
%c.4 = icmp ult i8 %x, 10
%res.3 = xor i1 %c.3, %c.4
ret i1 %res.3
}
define i1 @switch_same_destination_for_different_cases(i8 %x) {
; CHECK-LABEL: @switch_same_destination_for_different_cases(
; CHECK-NEXT: entry:
; CHECK-NEXT: switch i8 [[X:%.*]], label [[EXIT_1:%.*]] [
; CHECK-NEXT: i8 6, label [[EXIT_2:%.*]]
; CHECK-NEXT: i8 10, label [[EXIT_2]]
; CHECK-NEXT: ]
; CHECK: exit.1:
; CHECK-NEXT: [[C_1:%.*]] = icmp ult i8 [[X]], 7
; CHECK-NEXT: [[C_2:%.*]] = icmp ult i8 [[X]], 6
; CHECK-NEXT: [[RES_1:%.*]] = xor i1 [[C_1]], [[C_2]]
; CHECK-NEXT: ret i1 [[RES_1]]
; CHECK: exit.2:
; CHECK-NEXT: [[C_3:%.*]] = icmp ult i8 [[X]], 7
; CHECK-NEXT: call void @use(i1 [[C_3]])
; CHECK-NEXT: [[C_4:%.*]] = icmp ult i8 [[X]], 6
; CHECK-NEXT: call void @use(i1 [[C_4]])
; CHECK-NEXT: [[C_5:%.*]] = icmp ult i8 [[X]], 11
; CHECK-NEXT: call void @use(i1 [[C_5]])
; CHECK-NEXT: [[C_6:%.*]] = icmp ult i8 [[X]], 10
; CHECK-NEXT: ret i1 [[C_6]]
;
entry:
switch i8 %x, label %exit.1 [
i8 6, label %exit.2
i8 10, label %exit.2
]
exit.1:
%c.1 = icmp ult i8 %x, 7
%c.2 = icmp ult i8 %x, 6
%res.1 = xor i1 %c.1, %c.2
ret i1 %res.1
exit.2:
%c.3 = icmp ult i8 %x, 7
call void @use(i1 %c.3)
%c.4 = icmp ult i8 %x, 6
call void @use(i1 %c.4)
%c.5 = icmp ult i8 %x, 11
call void @use(i1 %c.5)
%c.6 = icmp ult i8 %x, 10
ret i1 %c.6
}
declare void @use(i1)
|
