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
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -switch-range-to-icmp -S | FileCheck %s
declare i32 @f(i32)
define i32 @basic(i32 %x) {
; CHECK-LABEL: @basic(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X:%.*]], -5
; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i32 [[X_OFF]], 3
; CHECK-NEXT: br i1 [[SWITCH]], label [[A:%.*]], label [[DEFAULT:%.*]]
; CHECK: common.ret:
; CHECK-NEXT: [[COMMON_RET_OP:%.*]] = phi i32 [ [[TMP0:%.*]], [[DEFAULT]] ], [ [[TMP1:%.*]], [[A]] ]
; CHECK-NEXT: ret i32 [[COMMON_RET_OP]]
; CHECK: default:
; CHECK-NEXT: [[TMP0]] = call i32 @f(i32 0)
; CHECK-NEXT: br label [[COMMON_RET:%.*]]
; CHECK: a:
; CHECK-NEXT: [[TMP1]] = call i32 @f(i32 1)
; CHECK-NEXT: br label [[COMMON_RET]]
;
entry:
switch i32 %x, label %default [
i32 5, label %a
i32 6, label %a
i32 7, label %a
]
default:
%0 = call i32 @f(i32 0)
ret i32 %0
a:
%1 = call i32 @f(i32 1)
ret i32 %1
}
define i32 @unreachable(i32 %x) {
; CHECK-LABEL: @unreachable(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X:%.*]], -5
; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i32 [[X_OFF]], 3
; CHECK-NEXT: br i1 [[SWITCH]], label [[A:%.*]], label [[B:%.*]]
; CHECK: common.ret:
; CHECK-NEXT: [[COMMON_RET_OP:%.*]] = phi i32 [ [[TMP0:%.*]], [[A]] ], [ [[TMP1:%.*]], [[B]] ]
; CHECK-NEXT: ret i32 [[COMMON_RET_OP]]
; CHECK: a:
; CHECK-NEXT: [[TMP0]] = call i32 @f(i32 0)
; CHECK-NEXT: br label [[COMMON_RET:%.*]]
; CHECK: b:
; CHECK-NEXT: [[TMP1]] = call i32 @f(i32 1)
; CHECK-NEXT: br label [[COMMON_RET]]
;
entry:
switch i32 %x, label %unreachable [
i32 5, label %a
i32 6, label %a
i32 7, label %a
i32 10, label %b
i32 20, label %b
i32 30, label %b
i32 40, label %b
]
unreachable:
unreachable
a:
%0 = call i32 @f(i32 0)
ret i32 %0
b:
%1 = call i32 @f(i32 1)
ret i32 %1
}
define i32 @unreachable2(i32 %x) {
; CHECK-LABEL: @unreachable2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X:%.*]], -5
; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i32 [[X_OFF]], 3
; CHECK-NEXT: br i1 [[SWITCH]], label [[A:%.*]], label [[B:%.*]]
; CHECK: common.ret:
; CHECK-NEXT: [[COMMON_RET_OP:%.*]] = phi i32 [ [[TMP0:%.*]], [[A]] ], [ [[TMP1:%.*]], [[B]] ]
; CHECK-NEXT: ret i32 [[COMMON_RET_OP]]
; CHECK: a:
; CHECK-NEXT: [[TMP0]] = call i32 @f(i32 0)
; CHECK-NEXT: br label [[COMMON_RET:%.*]]
; CHECK: b:
; CHECK-NEXT: [[TMP1]] = call i32 @f(i32 1)
; CHECK-NEXT: br label [[COMMON_RET]]
;
entry:
; Note: folding the most popular case destination into the default
; would prevent switch-to-icmp here.
switch i32 %x, label %unreachable [
i32 5, label %a
i32 6, label %a
i32 7, label %a
i32 10, label %b
i32 20, label %b
]
unreachable:
unreachable
a:
%0 = call i32 @f(i32 0)
ret i32 %0
b:
%1 = call i32 @f(i32 1)
ret i32 %1
}
; This would crash because we did not clean up the
; default block of the switch before removing the switch.
define void @PR42737(ptr %a, i1 %c) {
; CHECK-LABEL: @PR42737(
; CHECK-NEXT: entry:
; CHECK-NEXT: unreachable
;
entry:
br i1 %c, label %switch, label %else
else:
store i32 2, ptr %a
br label %switch
switch:
%cleanup.dest1 = phi i32 [ 0, %else ], [ 3, %entry ]
switch i32 %cleanup.dest1, label %unreach1 [
i32 0, label %cleanup1
i32 3, label %cleanup2
]
cleanup1:
br label %unreach2
cleanup2:
br label %unreach2
unreach1:
%phi2 = phi i32 [ %cleanup.dest1, %switch ]
unreachable
unreach2:
unreachable
}
define void @pr53208_single_reachable_dest(i8 %sw, ptr %p0) {
; CHECK-LABEL: @pr53208_single_reachable_dest(
; CHECK-NEXT: group2:
; CHECK-NEXT: call void @bar(ptr [[P0:%.*]])
; CHECK-NEXT: ret void
;
switch i8 %sw, label %group3 [
i8 0, label %group1
i8 1, label %group1
i8 2, label %group1
i8 3, label %group1
i8 11, label %group1
i8 12, label %group1
i8 13, label %group1
i8 7, label %group1
i8 17, label %group1
i8 14, label %group1
i8 15, label %group1
i8 4, label %group2
i8 5, label %group2
i8 6, label %group2
i8 8, label %group2
i8 9, label %group2
i8 10, label %group2
]
group1:
br label %exit
group2:
br label %exit
group3:
br label %exit
exit:
%phi = phi ptr [ null, %group3 ], [ %p0, %group2 ], [ null, %group1 ]
call void @bar(ptr %phi)
ret void
}
declare void @bar(ptr nonnull dereferenceable(4))
|
