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
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt %s -mtriple=x86_64-- -codegenprepare -S | FileCheck %s
@g = global i32 0
@effect = global i32 0
define void @switch_phi_const(i32 %x) {
; CHECK-LABEL: @switch_phi_const(
; CHECK-NEXT: bb0:
; CHECK-NEXT: switch i32 [[X:%.*]], label [[DEFAULT:%.*]] [
; CHECK-NEXT: i32 13, label [[CASE_13:%.*]]
; CHECK-NEXT: i32 42, label [[CASE_42:%.*]]
; CHECK-NEXT: i32 50, label [[CASE_50_51:%.*]]
; CHECK-NEXT: i32 51, label [[CASE_50_51]]
; CHECK-NEXT: i32 55, label [[CASE_55:%.*]]
; CHECK-NEXT: i32 7, label [[CASE_7:%.*]]
; CHECK-NEXT: ]
; CHECK: case_13:
; CHECK-NEXT: [[X0:%.*]] = phi i32 [ [[X]], [[BB0:%.*]] ], [ [[X_LOOPBACK:%.*]], [[CASE_7]] ]
; CHECK-NEXT: store i32 13, ptr @effect, align 4
; CHECK-NEXT: br label [[CASE_42]]
; CHECK: case_42:
; CHECK-NEXT: [[X1:%.*]] = phi i32 [ [[X]], [[BB0]] ], [ [[X0]], [[CASE_13]] ]
; CHECK-NEXT: store i32 [[X1]], ptr @effect, align 4
; CHECK-NEXT: br label [[CASE_50_51]]
; CHECK: case_50_51:
; CHECK-NEXT: [[X2:%.*]] = phi i32 [ 50, [[BB0]] ], [ 50, [[BB0]] ], [ [[X1]], [[CASE_42]] ]
; CHECK-NEXT: [[X2_2:%.*]] = phi i32 [ 51, [[BB0]] ], [ 51, [[BB0]] ], [ [[X1]], [[CASE_42]] ]
; CHECK-NEXT: store i32 [[X2]], ptr @effect, align 4
; CHECK-NEXT: store i32 [[X2_2]], ptr @effect, align 4
; CHECK-NEXT: br label [[CASE_55]]
; CHECK: case_55:
; CHECK-NEXT: [[X3:%.*]] = phi i32 [ 42, [[BB0]] ], [ 55, [[CASE_50_51]] ]
; CHECK-NEXT: store i32 [[X3]], ptr @effect, align 4
; CHECK-NEXT: br label [[DEFAULT]]
; CHECK: case_7:
; CHECK-NEXT: [[X_LOOPBACK]] = load i32, ptr @g, align 4
; CHECK-NEXT: store i32 7, ptr @effect, align 4
; CHECK-NEXT: br label [[CASE_13]]
; CHECK: default:
; CHECK-NEXT: ret void
;
bb0:
switch i32 %x, label %default [
i32 13, label %case_13
i32 42, label %case_42
i32 50, label %case_50_51
i32 51, label %case_50_51
i32 55, label %case_55
i32 7, label %case_7
]
case_13:
; We should replace 13 with %x
%x0 = phi i32 [ 13, %bb0 ], [ %x_loopback, %case_7 ]
store i32 13, ptr @effect, align 4
br label %case_42
case_42:
; We should replace 42 with %x
%x1 = phi i32 [ 42, %bb0 ], [ %x0, %case_13 ]
store i32 %x1, ptr @effect, align 4
br label %case_50_51
case_50_51:
; Must not replace the PHI argument: Case values 50 and 51 jump here.
%x2 = phi i32 [ 50, %bb0 ], [ 50, %bb0 ], [ %x1, %case_42 ]
%x2.2 = phi i32 [ 51, %bb0 ], [ 51, %bb0 ], [ %x1, %case_42 ]
store i32 %x2, ptr @effect, align 4
store i32 %x2.2, ptr @effect, align 4
br label %case_55
case_55:
; We must not replace any of the PHI arguments:
; - 42 is the wrong constant
; - %case_42 is not the switch predecessor block.
%x3 = phi i32 [ 42, %bb0 ], [ 55, %case_50_51 ]
store i32 %x3, ptr @effect, align 4
br label %default
case_7:
%x_loopback = load i32, ptr @g, align 4
store i32 7, ptr @effect, align 4
br label %case_13
default:
ret void
}
define void @switch_phi_const_multiple_phis(i32 %x, i1 %c) {
; CHECK-LABEL: @switch_phi_const_multiple_phis(
; CHECK-NEXT: bb0:
; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[CASE_13:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[X:%.*]], 13
; CHECK-NEXT: br i1 [[COND]], label [[CASE_13]], label [[DEFAULT:%.*]]
; CHECK: case_13:
; CHECK-NEXT: [[X0:%.*]] = phi i32 [ [[X]], [[BB1]] ], [ 1, [[BB0:%.*]] ]
; CHECK-NEXT: [[N0:%.*]] = phi i32 [ 14, [[BB1]] ], [ 1, [[BB0]] ]
; CHECK-NEXT: [[X1:%.*]] = phi i32 [ 27, [[BB0]] ], [ [[X]], [[BB1]] ]
; CHECK-NEXT: store volatile i32 [[X0]], ptr @effect, align 4
; CHECK-NEXT: store volatile i32 [[N0]], ptr @effect, align 4
; CHECK-NEXT: store volatile i32 [[X1]], ptr @effect, align 4
; CHECK-NEXT: ret void
; CHECK: default:
; CHECK-NEXT: ret void
;
bb0:
br i1 %c, label %bb1, label %case_13
bb1:
switch i32 %x, label %default [
i32 13, label %case_13
]
case_13:
; Check that replacement works for multiple PHIs.
; Should perform replacement for %x0, %x1 but not %n0
%x0 = phi i32 [13, %bb1], [1, %bb0]
%n0 = phi i32 [14, %bb1], [1, %bb0]
%x1 = phi i32 [27, %bb0], [13, %bb1]
store volatile i32 %x0, ptr @effect, align 4
store volatile i32 %n0, ptr @effect, align 4
store volatile i32 %x1, ptr @effect, align 4
ret void
default:
ret void
}
define void @switch_phi_const_degenerate(i1 %c) {
; CHECK-LABEL: @switch_phi_const_degenerate(
; CHECK-NEXT: bb0:
; CHECK-NEXT: br i1 [[C:%.*]], label [[CASE_42:%.*]], label [[BB1:%.*]]
; CHECK: bb1:
; CHECK-NEXT: br label [[CASE_42]]
; CHECK: case_42:
; CHECK-NEXT: [[X:%.*]] = phi i32 [ 0, [[BB0:%.*]] ], [ 42, [[BB1]] ]
; CHECK-NEXT: store volatile i32 [[X]], ptr @effect, align 4
; CHECK-NEXT: ret void
;
bb0:
br i1 %c, label %case_42, label %bb1
bb1:
switch i32 42, label %unreachable [
i32 42, label %case_42
]
case_42:
; We should not end up in an endless loop 42 with the switch condition 42.
%x = phi i32 [0, %bb0], [42, %bb1]
store volatile i32 %x, ptr @effect, align 4
ret void
unreachable:
unreachable
}
@g64 = global i64 0
@effect64 = global i64 0
define void @switch_trunc_phi_const(i32 %x) {
; CHECK-LABEL: @switch_trunc_phi_const(
; CHECK-NEXT: bb0:
; CHECK-NEXT: [[TMP0:%.*]] = zext i32 [[X:%.*]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = zext i32 [[X]] to i64
; CHECK-NEXT: switch i32 [[X]], label [[DEFAULT:%.*]] [
; CHECK-NEXT: i32 13, label [[CASE_13:%.*]]
; CHECK-NEXT: i32 42, label [[CASE_42:%.*]]
; CHECK-NEXT: i32 55, label [[CASE_55:%.*]]
; CHECK-NEXT: i32 7, label [[CASE_7:%.*]]
; CHECK-NEXT: ]
; CHECK: case_13:
; CHECK-NEXT: [[X0:%.*]] = phi i64 [ [[TMP0]], [[BB0:%.*]] ], [ [[X7:%.*]], [[CASE_7]] ]
; CHECK-NEXT: store i64 13, ptr @effect64, align 4
; CHECK-NEXT: br label [[CASE_42]]
; CHECK: case_42:
; CHECK-NEXT: [[X1:%.*]] = phi i64 [ [[TMP1]], [[BB0]] ], [ [[X0]], [[CASE_13]] ]
; CHECK-NEXT: store i64 [[X1]], ptr @effect64, align 4
; CHECK-NEXT: br label [[CASE_55]]
; CHECK: case_55:
; CHECK-NEXT: [[X2:%.*]] = phi i64 [ 3895, [[BB0]] ], [ 55, [[CASE_42]] ]
; CHECK-NEXT: store i64 [[X2]], ptr @effect64, align 4
; CHECK-NEXT: br label [[DEFAULT]]
; CHECK: case_7:
; CHECK-NEXT: [[X7]] = load i64, ptr @g64, align 4
; CHECK-NEXT: store i64 7, ptr @effect64, align 4
; CHECK-NEXT: br label [[CASE_13]]
; CHECK: default:
; CHECK-NEXT: ret void
;
bb0:
switch i32 %x, label %default [
i32 13, label %case_13
i32 42, label %case_42
i32 55, label %case_55
i32 7, label %case_7
]
case_13:
; We should replace 13 with zext %x to i64
%x0 = phi i64 [ 13, %bb0 ], [ %x7, %case_7 ]
store i64 13, ptr @effect64, align 4
br label %case_42
case_42:
; We should replace 42 with zext i32 %x to i64
%x1 = phi i64 [ 42, %bb0 ], [ %x0, %case_13 ]
store i64 %x1, ptr @effect64, align 4
br label %case_55
case_55:
; We must not replace any of the PHI arguments! (3898 == 0xf00 + 55)
%x2 = phi i64 [ 3895, %bb0 ], [ 55, %case_42 ]
store i64 %x2, ptr @effect64, align 4
br label %default
case_7:
%x7 = load i64, ptr @g64, align 4
store i64 7, ptr @effect64, align 4
br label %case_13
default:
ret void
}
|
