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
|
; RUN: opt %s -S -passes=licm -o - | FileCheck %s
;; $ cat test.c
;; int b, c, d;
;; void e();
;; void f(int *g) { *g = b; }
;; void i() {
;; int h, a;
;; for (;;) {
;; e();
;; a = 1;
;; if (h) {
;; if (d)
;; continue;
;; h = c;
;; }
;; f(&a);
;; }
;; }
;; Generated by getting the IR before LICM in:
;; $ clang -c -O2 -g test.c -fno-unroll-loops -fno-vectorize -fno-inline -Xclang -fexperimental-assignment-tracking -o -
;; entry
;; |
;; v
;; *---->for.cond.outer
;; | |
;; | v
;; | +->for.cond-----+
;; | | | |
;; | | v |
;; | +--if.then |
;; | | |
;; | v v
;; | if.end if.end3.loopexit
;; | | |
;; | v |
;; +-----if.end3 <----+
;;
;; The store in for.cond is sunk into the inner-loop exits if.end and if.end3.loopexit.
;;
;; Check that a store sunk into multiple exits retains its (their) dbg.assign,
;; and that the new stores share the same DIAssignID.
; CHECK-LABEL: for.cond:
; CHECK: call void @llvm.dbg.assign(metadata i32 1, metadata ![[var:[0-9]+]], metadata !DIExpression(), metadata ![[id:[0-9]+]], metadata ptr %a, metadata !DIExpression()), !dbg
; CHECK-LABEL: if.end:
; CHECK-NEXT: store i32 1, ptr %a, align 1,{{.*}}!DIAssignID ![[id]]
; CHECK-LABEL: if.end3.loopexit:
; CHECK-NEXT: store i32 1, ptr %a, align 1,{{.*}}!DIAssignID ![[id]]
; CHECK-DAG: ![[var]] = !DILocalVariable(name: "a",
@b = dso_local local_unnamed_addr global i32 0, align 4, !dbg !0
@d = dso_local local_unnamed_addr global i32 0, align 4, !dbg !9
@c = dso_local local_unnamed_addr global i32 0, align 4, !dbg !6
define dso_local void @f(ptr nocapture %g) local_unnamed_addr #0 !dbg !15 {
entry:
call void @llvm.dbg.assign(metadata i1 undef, metadata !20, metadata !DIExpression(), metadata !21, metadata ptr undef, metadata !DIExpression()), !dbg !22
call void @llvm.dbg.assign(metadata ptr %g, metadata !20, metadata !DIExpression(), metadata !23, metadata ptr undef, metadata !DIExpression()), !dbg !22
%0 = load i32, ptr @b, align 4, !dbg !24
store i32 %0, ptr %g, align 4, !dbg !29
ret void, !dbg !30
}
define dso_local void @i() local_unnamed_addr #2 !dbg !31 {
entry:
call void @llvm.dbg.assign(metadata i1 undef, metadata !35, metadata !DIExpression(), metadata !37, metadata ptr undef, metadata !DIExpression()), !dbg !38
%a = alloca i32, align 4, !DIAssignID !39
call void @llvm.dbg.assign(metadata i1 undef, metadata !36, metadata !DIExpression(), metadata !39, metadata ptr %a, metadata !DIExpression()), !dbg !38
call void @llvm.lifetime.start.p0i8(i64 4, ptr nonnull %a) #5, !dbg !40
br label %for.cond.outer, !dbg !41
for.cond.outer: ; preds = %if.end3, %entry
%h.0.ph = phi i32 [ %h.1, %if.end3 ], [ undef, %entry ]
br label %for.cond, !dbg !42
for.cond: ; preds = %for.cond.outer, %if.then
call void @llvm.dbg.value(metadata i32 %h.0.ph, metadata !35, metadata !DIExpression()), !dbg !38
tail call void (...) @e() #5, !dbg !44
store i32 1, ptr %a, align 4, !dbg !47, !DIAssignID !48
call void @llvm.dbg.assign(metadata i32 1, metadata !36, metadata !DIExpression(), metadata !48, metadata ptr %a, metadata !DIExpression()), !dbg !38
%tobool.not = icmp eq i32 %h.0.ph, 0, !dbg !49
br i1 %tobool.not, label %if.end3.loopexit, label %if.then, !dbg !51
if.then: ; preds = %for.cond
%0 = load i32, ptr @d, align 4, !dbg !52
%tobool1.not = icmp eq i32 %0, 0, !dbg !52
br i1 %tobool1.not, label %if.end, label %for.cond, !dbg !55, !llvm.loop !56
if.end: ; preds = %if.then
%1 = load i32, ptr @c, align 4, !dbg !59
call void @llvm.dbg.assign(metadata i32 %1, metadata !35, metadata !DIExpression(), metadata !60, metadata ptr undef, metadata !DIExpression()), !dbg !38
br label %if.end3, !dbg !61
if.end3.loopexit: ; preds = %for.cond
br label %if.end3, !dbg !62
if.end3: ; preds = %if.end3.loopexit, %if.end
%h.1 = phi i32 [ %1, %if.end ], [ 0, %if.end3.loopexit ]
call void @llvm.dbg.value(metadata i32 %h.1, metadata !35, metadata !DIExpression()), !dbg !38
call void @f(ptr nonnull %a), !dbg !62
br label %for.cond.outer, !dbg !63, !llvm.loop !56
}
declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #1
declare void @llvm.lifetime.start.p0i8(i64 immarg, ptr nocapture) #3
declare !dbg !64 dso_local void @e(...) local_unnamed_addr #4
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!11, !12, !13, !1000}
!llvm.ident = !{!14}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "b", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
!3 = !DIFile(filename: "test.c", directory: "/")
!4 = !{}
!5 = !{!0, !6, !9}
!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
!7 = distinct !DIGlobalVariable(name: "c", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true)
!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!9 = !DIGlobalVariableExpression(var: !10, expr: !DIExpression())
!10 = distinct !DIGlobalVariable(name: "d", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true)
!11 = !{i32 7, !"Dwarf Version", i32 4}
!12 = !{i32 2, !"Debug Info Version", i32 3}
!13 = !{i32 1, !"wchar_size", i32 4}
!14 = !{!"clang version 12.0.0"}
!15 = distinct !DISubprogram(name: "f", scope: !3, file: !3, line: 3, type: !16, scopeLine: 3, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !19)
!16 = !DISubroutineType(types: !17)
!17 = !{null, !18}
!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 64)
!19 = !{!20}
!20 = !DILocalVariable(name: "g", arg: 1, scope: !15, file: !3, line: 3, type: !18)
!21 = distinct !DIAssignID()
!22 = !DILocation(line: 0, scope: !15)
!23 = distinct !DIAssignID()
!24 = !DILocation(line: 3, column: 23, scope: !15)
!29 = !DILocation(line: 3, column: 21, scope: !15)
!30 = !DILocation(line: 3, column: 26, scope: !15)
!31 = distinct !DISubprogram(name: "i", scope: !3, file: !3, line: 4, type: !32, scopeLine: 4, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !34)
!32 = !DISubroutineType(types: !33)
!33 = !{null}
!34 = !{!35, !36}
!35 = !DILocalVariable(name: "h", scope: !31, file: !3, line: 5, type: !8)
!36 = !DILocalVariable(name: "a", scope: !31, file: !3, line: 5, type: !8)
!37 = distinct !DIAssignID()
!38 = !DILocation(line: 0, scope: !31)
!39 = distinct !DIAssignID()
!40 = !DILocation(line: 5, column: 3, scope: !31)
!41 = !DILocation(line: 6, column: 3, scope: !31)
!42 = !DILocation(line: 6, column: 3, scope: !43)
!43 = distinct !DILexicalBlock(scope: !31, file: !3, line: 6, column: 3)
!44 = !DILocation(line: 7, column: 5, scope: !45)
!45 = distinct !DILexicalBlock(scope: !46, file: !3, line: 6, column: 12)
!46 = distinct !DILexicalBlock(scope: !43, file: !3, line: 6, column: 3)
!47 = !DILocation(line: 8, column: 7, scope: !45)
!48 = distinct !DIAssignID()
!49 = !DILocation(line: 9, column: 9, scope: !50)
!50 = distinct !DILexicalBlock(scope: !45, file: !3, line: 9, column: 9)
!51 = !DILocation(line: 9, column: 9, scope: !45)
!52 = !DILocation(line: 10, column: 11, scope: !53)
!53 = distinct !DILexicalBlock(scope: !54, file: !3, line: 10, column: 11)
!54 = distinct !DILexicalBlock(scope: !50, file: !3, line: 9, column: 12)
!55 = !DILocation(line: 10, column: 11, scope: !54)
!56 = distinct !{!56, !42, !57, !58}
!57 = !DILocation(line: 15, column: 3, scope: !43)
!58 = !{!"llvm.loop.unroll.disable"}
!59 = !DILocation(line: 12, column: 11, scope: !54)
!60 = distinct !DIAssignID()
!61 = !DILocation(line: 13, column: 5, scope: !54)
!62 = !DILocation(line: 14, column: 5, scope: !45)
!63 = !DILocation(line: 6, column: 3, scope: !46)
!64 = !DISubprogram(name: "e", scope: !3, file: !3, line: 2, type: !65, spFlags: DISPFlagOptimized, retainedNodes: !4)
!65 = !DISubroutineType(types: !66)
!66 = !{null, null}
!1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true}
|
