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
|
# RUN: llc -run-pass=block-placement %s -o - | FileCheck %s
--- |
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define void @_Z3fn1v() !dbg !6 {
entry:
%d = alloca i8, align 1
br i1 1, label %for.cond.cleanup, label %for.body
for.cond.cleanup:
ret void
for.body:
br i1 1, label %for.cond.cleanup, label %for.body.1
for.body.1:
br i1 1, label %for.cond.cleanup, label %for.body.2
for.body.2:
br i1 1, label %for.cond.cleanup, label %for.body.3
for.body.3:
br i1 1, label %for.cond.cleanup, label %for.body.4
for.body.4:
br i1 1, label %for.cond.cleanup, label %for.body.5
for.body.5:
br i1 1, label %for.cond.cleanup, label %for.body.6
for.body.6:
br i1 1, label %for.cond.cleanup, label %for.body.7
for.body.7:
br i1 1, label %for.cond.cleanup, label %for.body.8
for.body.8:
br i1 1, label %for.cond.cleanup, label %for.body.9
for.body.9:
br i1 1, label %for.cond.cleanup, label %for.body.10
for.body.10:
br i1 1, label %for.cond.cleanup, label %for.body.11
for.body.11:
%d.0.d.0..12 = load volatile i8, i8* %d, align 1
call void @llvm.dbg.value(metadata i8 %d.0.d.0..12, metadata !16, metadata !DIExpression()), !dbg !19
br label %for.cond.cleanup
}
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 7.0.0 (trunk 326606)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !2)
!1 = !DIFile(filename: "repro.cpp", directory: "/home/mdavis/bugs/bz-189869")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = distinct !DISubprogram(name: "fn1", linkageName: "_Z3fn1v", scope: !7, file: !7, line: 4, type: !8, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !15)
!7 = !DIFile(filename: "./repro.cpp", directory: "/home/mdavis/bugs/bz-189869")
!8 = !DISubroutineType(types: !9)
!9 = !{}
!15 = !{!16}
!16 = !DILocalVariable(name: "d", scope: !6, file: !7, line: 6, type: !17)
!17 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !18)
!18 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
!19 = !DILocation(line: 6, column: 17, scope: !6)
...
---
# CHECK: name: _Z3fn1v
# CHECK: bb.10.for.body.9
# CHECK: renamable $al
# CHECK-NEXT: TEST8rr killed renamable $al
# CHECK-NEXT: JCC_1
# CHECK-NOT: $al = IMPLICIT_DEF
# CHECK: bb.12.for.body.10
name: _Z3fn1v
alignment: 16
tracksRegLiveness: true
constants:
body: |
bb.0.entry:
successors: %bb.1, %bb.4
liveins: $rdi, $rbp, $r15, $r14, $r13, $r12, $rbx
renamable $al = MOV8ri 1
TEST8rr renamable $al, renamable $al, implicit-def $eflags
JCC_1 %bb.4, 5, implicit killed $eflags
bb.1.for.cond.cleanup:
successors: %bb.3, %bb.2
liveins: $ecx, $rdi
renamable $eax = MOV32rm $rsp, 1, $noreg, -16, $noreg
CMP32rm killed renamable $eax, $rip, 1, $noreg, $noreg, $noreg, implicit-def $eflags
JCC_1 %bb.3, 6, implicit $eflags
bb.2:
successors: %bb.3
liveins: $ebp, $ebx, $edx, $esi, $rdi, $r8d, $r9d, $r10d, $r11d, $r12d, $r13d, $r14d, $r15d
bb.3.for.cond.cleanup:
liveins: $rdi, $xmm3, $xmm4, $xmm5, $xmm6, $xmm7, $xmm9, $xmm13, $xmm14
RETQ
bb.4.for.body:
successors: %bb.1, %bb.5
liveins: $al, $rdi
renamable $ecx = XOR32rr undef $ecx, undef $ecx, implicit-def dead $eflags
TEST8rr killed renamable $al, renamable $al, implicit-def $eflags
JCC_1 %bb.1, 5, implicit $eflags
bb.5.for.body.1:
successors: %bb.1, %bb.6
liveins: $ecx, $rdi
renamable $al = MOV8ri 1
TEST8rr killed renamable $al, renamable $al, implicit-def $eflags
JCC_1 %bb.1, 5, implicit $eflags
bb.6.for.body.2:
successors: %bb.1, %bb.7
liveins: $ecx, $eflags, $rdi
JCC_1 %bb.1, 5, implicit $eflags
bb.7.for.body.3:
successors: %bb.1, %bb.8
liveins: $ecx, $rdi
renamable $al = MOV8ri 1
TEST8rr killed renamable $al, renamable $al, implicit-def $eflags
JCC_1 %bb.1, 5, implicit $eflags
bb.8.for.body.4:
successors: %bb.1, %bb.9
liveins: $ecx, $eflags, $rdi
JCC_1 %bb.1, 5, implicit $eflags
bb.9.for.body.5:
successors: %bb.1, %bb.10
liveins: $ecx, $rdi
renamable $al = MOV8ri 1
TEST8rr killed renamable $al, renamable $al, implicit-def $eflags
JCC_1 %bb.1, 5, implicit $eflags
bb.10.for.body.6:
successors: %bb.1, %bb.11
liveins: $ecx, $eflags, $rdi
JCC_1 %bb.1, 5, implicit $eflags
bb.11.for.body.7:
successors: %bb.1, %bb.12
liveins: $ecx, $rdi
renamable $al = MOV8ri 1
TEST8rr killed renamable $al, renamable $al, implicit-def $eflags
JCC_1 %bb.1, 5, implicit $eflags
bb.12.for.body.8:
successors: %bb.1, %bb.13
liveins: $ecx, $eflags, $rdi
JCC_1 %bb.1, 5, implicit $eflags
bb.13.for.body.9:
successors: %bb.14, %bb.15
liveins: $rdi
renamable $al = MOV8ri 1
TEST8rr killed renamable $al, renamable $al, implicit-def $eflags
JCC_1 %bb.15, 4, implicit $eflags
bb.14:
successors: %bb.1
liveins: $rdi
renamable $ecx = XOR32rr undef $ecx, undef $ecx, implicit-def dead $eflags
JMP_1 %bb.1
bb.15.for.body.10:
successors: %bb.16, %bb.17
liveins: $eflags, $rdi
JCC_1 %bb.17, 4, implicit killed $eflags
bb.16:
successors: %bb.1
liveins: $rdi
JMP_1 %bb.1
bb.17.for.body.11:
successors: %bb.1
liveins: $rdi
dead renamable $al = MOV8rm $rsp, 1, $noreg, -121, $noreg
DBG_VALUE $al, $noreg, !16, !DIExpression(), debug-location !19
renamable $ecx = XOR32rr undef $ecx, undef $ecx, implicit-def dead $eflags
JMP_1 %bb.1
...
|
