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
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
define i1 @test_switch_with_shl_mask(i32 %a) {
; CHECK-LABEL: define i1 @test_switch_with_shl_mask(
; CHECK-SAME: i32 [[A:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TRUNC:%.*]] = trunc i32 [[A]] to i8
; CHECK-NEXT: switch i8 [[TRUNC]], label [[SW_DEFAULT:%.*]] [
; CHECK-NEXT: i8 0, label [[SW_BB:%.*]]
; CHECK-NEXT: i8 1, label [[SW_BB]]
; CHECK-NEXT: i8 -128, label [[SW_BB]]
; CHECK-NEXT: ]
; CHECK: sw.bb:
; CHECK-NEXT: ret i1 true
; CHECK: sw.default:
; CHECK-NEXT: ret i1 false
;
entry:
%b = shl i32 %a, 24
switch i32 %b, label %sw.default [
i32 0, label %sw.bb
i32 16777216, label %sw.bb
i32 2147483648, label %sw.bb
]
sw.bb:
ret i1 true
sw.default:
ret i1 false
}
define i1 @test_switch_with_shl_nuw_multiuse(i32 %a) {
; CHECK-LABEL: define i1 @test_switch_with_shl_nuw_multiuse(
; CHECK-SAME: i32 [[A:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B:%.*]] = shl nuw i32 [[A]], 24
; CHECK-NEXT: call void @use(i32 [[B]])
; CHECK-NEXT: switch i32 [[A]], label [[SW_DEFAULT:%.*]] [
; CHECK-NEXT: i32 0, label [[SW_BB:%.*]]
; CHECK-NEXT: i32 1, label [[SW_BB]]
; CHECK-NEXT: i32 128, label [[SW_BB]]
; CHECK-NEXT: ]
; CHECK: sw.bb:
; CHECK-NEXT: ret i1 true
; CHECK: sw.default:
; CHECK-NEXT: ret i1 false
;
entry:
%b = shl nuw i32 %a, 24
call void @use(i32 %b)
switch i32 %b, label %sw.default [
i32 0, label %sw.bb
i32 16777216, label %sw.bb
i32 2147483648, label %sw.bb
]
sw.bb:
ret i1 true
sw.default:
ret i1 false
}
define i1 @test_switch_with_shl_nsw_multiuse(i32 %a) {
; CHECK-LABEL: define i1 @test_switch_with_shl_nsw_multiuse(
; CHECK-SAME: i32 [[A:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B:%.*]] = shl nsw i32 [[A]], 24
; CHECK-NEXT: call void @use(i32 [[B]])
; CHECK-NEXT: switch i32 [[A]], label [[SW_DEFAULT:%.*]] [
; CHECK-NEXT: i32 0, label [[SW_BB:%.*]]
; CHECK-NEXT: i32 1, label [[SW_BB]]
; CHECK-NEXT: i32 -128, label [[SW_BB]]
; CHECK-NEXT: ]
; CHECK: sw.bb:
; CHECK-NEXT: ret i1 true
; CHECK: sw.default:
; CHECK-NEXT: ret i1 false
;
entry:
%b = shl nsw i32 %a, 24
call void @use(i32 %b)
switch i32 %b, label %sw.default [
i32 0, label %sw.bb
i32 16777216, label %sw.bb
i32 2147483648, label %sw.bb
]
sw.bb:
ret i1 true
sw.default:
ret i1 false
}
; Negative tests
define i1 @test_switch_with_shl_mask_multiuse(i32 %a) {
; CHECK-LABEL: define i1 @test_switch_with_shl_mask_multiuse(
; CHECK-SAME: i32 [[A:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B:%.*]] = shl i32 [[A]], 24
; CHECK-NEXT: call void @use(i32 [[B]])
; CHECK-NEXT: switch i32 [[B]], label [[SW_DEFAULT:%.*]] [
; CHECK-NEXT: i32 0, label [[SW_BB:%.*]]
; CHECK-NEXT: i32 16777216, label [[SW_BB]]
; CHECK-NEXT: i32 -2147483648, label [[SW_BB]]
; CHECK-NEXT: ]
; CHECK: sw.bb:
; CHECK-NEXT: ret i1 true
; CHECK: sw.default:
; CHECK-NEXT: ret i1 false
;
entry:
%b = shl i32 %a, 24
call void @use(i32 %b)
switch i32 %b, label %sw.default [
i32 0, label %sw.bb
i32 16777216, label %sw.bb
i32 2147483648, label %sw.bb
]
sw.bb:
ret i1 true
sw.default:
ret i1 false
}
define i1 @test_switch_with_shl_mask_unknown_shamt(i32 %a, i32 %shamt) {
; CHECK-LABEL: define i1 @test_switch_with_shl_mask_unknown_shamt(
; CHECK-SAME: i32 [[A:%.*]], i32 [[SHAMT:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B:%.*]] = shl i32 [[A]], [[SHAMT]]
; CHECK-NEXT: switch i32 [[B]], label [[SW_DEFAULT:%.*]] [
; CHECK-NEXT: i32 0, label [[SW_BB:%.*]]
; CHECK-NEXT: i32 16777216, label [[SW_BB]]
; CHECK-NEXT: i32 -2147483648, label [[SW_BB]]
; CHECK-NEXT: ]
; CHECK: sw.bb:
; CHECK-NEXT: ret i1 true
; CHECK: sw.default:
; CHECK-NEXT: ret i1 false
;
entry:
%b = shl i32 %a, %shamt
switch i32 %b, label %sw.default [
i32 0, label %sw.bb
i32 16777216, label %sw.bb
i32 2147483648, label %sw.bb
]
sw.bb:
ret i1 true
sw.default:
ret i1 false
}
define i1 @test_switch_with_shl_mask_poison(i32 %a) {
; CHECK-LABEL: define i1 @test_switch_with_shl_mask_poison(
; CHECK-SAME: i32 [[A:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: switch i32 poison, label [[SW_DEFAULT:%.*]] [
; CHECK-NEXT: i32 0, label [[SW_BB:%.*]]
; CHECK-NEXT: i32 16777216, label [[SW_BB]]
; CHECK-NEXT: i32 -2147483648, label [[SW_BB]]
; CHECK-NEXT: ]
; CHECK: sw.bb:
; CHECK-NEXT: ret i1 true
; CHECK: sw.default:
; CHECK-NEXT: ret i1 false
;
entry:
%b = shl i32 %a, 32
switch i32 %b, label %sw.default [
i32 0, label %sw.bb
i32 16777216, label %sw.bb
i32 2147483648, label %sw.bb
]
sw.bb:
ret i1 true
sw.default:
ret i1 false
}
declare void @use(i32)
|
