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
|
; REQUIRES: aarch64-registered-target
; RUN: opt -passes='require<profile-summary>,function(codegenprepare)' < %s -mtriple=aarch64-none-linux-gnu -S | FileCheck %s
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64--linux-gnu"
; Expect to skip merging two empty blocks (sw.bb and sw.bb2) into sw.epilog
; as both of them are unlikely executed.
define i32 @f_switch(i32 %c) {
; CHECK-LABEL: @f_switch
; CHECK-LABEL: entry:
; CHECK: i32 10, label %sw.bb
; CHECK: i32 20, label %sw.bb2
entry:
switch i32 %c, label %sw.default [
i32 10, label %sw.bb
i32 20, label %sw.bb2
i32 30, label %sw.bb3
i32 40, label %sw.bb4
], !prof !0
sw.bb: ; preds = %entry
br label %sw.epilog
sw.bb2: ; preds = %entry
br label %sw.epilog
sw.bb3: ; preds = %entry
call void @callcase3()
br label %sw.epilog
sw.bb4: ; preds = %entry
call void @callcase4()
br label %sw.epilog
sw.default: ; preds = %entry
call void @calldefault()
br label %sw.epilog
; CHECK-LABEL: sw.epilog:
; CHECK: %fp.0 = phi ptr [ @FD, %sw.default ], [ @F4, %sw.bb4 ], [ @F3, %sw.bb3 ], [ @F2, %sw.bb2 ], [ @F1, %sw.bb ]
sw.epilog: ; preds = %sw.default, %sw.bb3, %sw.bb2, %sw.bb
%fp.0 = phi ptr [ @FD, %sw.default ], [ @F4, %sw.bb4 ], [ @F3, %sw.bb3 ], [ @F2, %sw.bb2 ], [ @F1, %sw.bb ]
call void %fp.0()
ret i32 0
}
; Expect not to merge sw.bb2 because of the conflict in the incoming value from
; sw.bb which is already merged.
define i32 @f_switch2(i32 %c) {
; CHECK-LABEL: @f_switch2
; CHECK-LABEL: entry:
; CHECK: i32 10, label %sw.epilog
; CHECK: i32 20, label %sw.bb2
entry:
switch i32 %c, label %sw.default [
i32 10, label %sw.bb
i32 20, label %sw.bb2
i32 30, label %sw.bb3
i32 40, label %sw.bb4
], !prof !1
sw.bb: ; preds = %entry
br label %sw.epilog
sw.bb2: ; preds = %entry
br label %sw.epilog
sw.bb3: ; preds = %entry
call void @callcase3()
br label %sw.epilog
sw.bb4: ; preds = %entry
call void @callcase4()
br label %sw.epilog
sw.default: ; preds = %entry
call void @calldefault()
br label %sw.epilog
; CHECK-LABEL: sw.epilog:
; CHECK: %fp.0 = phi ptr [ @FD, %sw.default ], [ @F4, %sw.bb4 ], [ @F3, %sw.bb3 ], [ @F2, %sw.bb2 ], [ @F1, %entry ]
sw.epilog: ; preds = %sw.default, %sw.bb3, %sw.bb2, %sw.bb
%fp.0 = phi ptr [ @FD, %sw.default ], [ @F4, %sw.bb4 ], [ @F3, %sw.bb3 ], [ @F2, %sw.bb2 ], [ @F1, %sw.bb ]
call void %fp.0()
ret i32 0
}
; Multiple empty blocks should be considered together if all incoming values
; from them are same. We expect to merge both empty blocks (sw.bb and sw.bb2)
; because the sum of frequencies are higer than the threshold.
define i32 @f_switch3(i32 %c) {
; CHECK-LABEL: @f_switch3
; CHECK-LABEL: entry:
; CHECK: i32 10, label %sw.epilog
; CHECK: i32 20, label %sw.epilog
entry:
switch i32 %c, label %sw.default [
i32 10, label %sw.bb
i32 20, label %sw.bb2
i32 30, label %sw.bb3
i32 40, label %sw.bb4
], !prof !2
sw.bb: ; preds = %entry
br label %sw.epilog
sw.bb2: ; preds = %entry
br label %sw.epilog
sw.bb3: ; preds = %entry
call void @callcase3()
br label %sw.epilog
sw.bb4: ; preds = %entry
call void @callcase4()
br label %sw.epilog
sw.default: ; preds = %entry
call void @calldefault()
br label %sw.epilog
; CHECK-LABEL: sw.epilog:
; CHECK: %fp.0 = phi ptr [ @FD, %sw.default ], [ @F4, %sw.bb4 ], [ @F3, %sw.bb3 ], [ @F1, %entry ], [ @F1, %entry ]
sw.epilog: ; preds = %sw.default, %sw.bb3, %sw.bb2, %sw.bb
%fp.0 = phi ptr [ @FD, %sw.default ], [ @F4, %sw.bb4 ], [ @F3, %sw.bb3 ], [ @F1, %sw.bb2 ], [ @F1, %sw.bb ]
call void %fp.0()
ret i32 0
}
declare void @F1(...) local_unnamed_addr
declare void @F2(...) local_unnamed_addr
declare void @F3(...) local_unnamed_addr
declare void @F4(...) local_unnamed_addr
declare void @FD(...) local_unnamed_addr
declare void @callcase3(...) local_unnamed_addr
declare void @callcase4(...) local_unnamed_addr
declare void @calldefault(...) local_unnamed_addr
!0 = !{!"branch_weights", i32 5, i32 1, i32 1,i32 5, i32 5}
!1 = !{!"branch_weights", i32 1 , i32 5, i32 1,i32 1, i32 1}
!2 = !{!"branch_weights", i32 1 , i32 4, i32 1,i32 1, i32 1}
; This test that BFI/BPI is created without any assertion in isMergingEmptyBlockProfitable()
; in the case where empty blocks are removed before creating BFI/BPI.
@b = common global i32 0, align 4
@a = common global ptr null, align 8
define i32 @should_not_assert(i32 %i) local_unnamed_addr {
entry:
%0 = load i32, ptr @b, align 4
%cond = icmp eq i32 %0, 6
br i1 %cond, label %while.cond.preheader, label %sw.epilog
while.cond.preheader: ; preds = %entry
%1 = load ptr, ptr @a, align 8
%magicptr = ptrtoint ptr %1 to i64
%arrayidx = getelementptr inbounds i32, ptr %1, i64 1
br label %while.cond
while.cond: ; preds = %while.cond.preheader, %land.rhs
switch i64 %magicptr, label %land.rhs [
i64 32, label %while.cond2.loopexit
i64 0, label %while.cond2.loopexit
]
land.rhs: ; preds = %while.cond
%2 = load i32, ptr %arrayidx, align 4
%tobool1 = icmp eq i32 %2, 0
br i1 %tobool1, label %while.cond2thread-pre-split.loopexit, label %while.cond
while.cond2thread-pre-split.loopexit: ; preds = %land.rhs
br label %while.cond2thread-pre-split
while.cond2thread-pre-split: ; preds = %while.cond2thread-pre-split.loopexit, %while.body4
%.pr = phi ptr [ %.pr.pre, %while.body4 ], [ %1, %while.cond2thread-pre-split.loopexit ]
br label %while.cond2
while.cond2.loopexit: ; preds = %while.cond, %while.cond
br label %while.cond2
while.cond2: ; preds = %while.cond2.loopexit, %while.cond2thread-pre-split
%3 = phi ptr [ %.pr, %while.cond2thread-pre-split ], [ %1, %while.cond2.loopexit ]
%tobool3 = icmp eq ptr %3, null
br i1 %tobool3, label %sw.epilog, label %while.body4
while.body4: ; preds = %while.cond2
tail call void @fn2()
%.pr.pre = load ptr, ptr @a, align 8
br label %while.cond2thread-pre-split
sw.epilog: ; preds = %while.cond2, %entry
ret i32 undef
}
declare void @fn2(...) local_unnamed_addr
|
