xref: /llvm-project/llvm/test/DebugInfo/assignment-tracking/X86/negative-offset.ll (revision 30845e8ab46c416a2e333eb84239e9ec71e92617)
1; RUN: llc %s -stop-after=finalize-isel -o - | FileCheck %s --implicit-check-not=DBG_VALUE
2
3
4; RUN: llc --try-experimental-debuginfo-iterators %s -stop-after=finalize-isel -o - | FileCheck %s --implicit-check-not=DBG_VALUE
5
6;; Check stores to an address computed as a negative offset from an alloca are
7;; ignored by the assignment tracking analysis. For this example that should
8;; result in no DBG_VALUEs in the while.body.lr.ph branch.
9;;
10;; See llvm.org/PR62838 for more info.
11;;
12;; $ clang test.c -O1 -g
13;; $ cat tes.c
14;; void a(int *p);
15;; __attribute__((nodebug)) int b;
16;;
17;; int main() {
18;;   int c[1];
19;;   __attribute__((nodebug)) int d = -1;
20;;
21;;   while (b) {
22;;     c[0] = 0;
23;;     c[d] = 0;
24;;   }
25;;   a(c);
26;;   return 0;
27;; }
28
29; CHECK: bb.0.entry:
30; CHECK-NEXT: successors
31; CHECK-NEXT: {{^ *$}}
32; CHECK-NEXT: DBG_VALUE %stack.0.c, $noreg, ![[#]], !DIExpression(DW_OP_deref)
33
34; CHECK:  bb.2.while.body:
35; CHECK-NEXT: successors
36; CHECK-NEXT: {{^ *$}}
37; CHECK-NEXT: DBG_VALUE 0, $noreg, ![[#]], !DIExpression()
38
39target triple = "x86_64-unknown-linux-gnu"
40
41@b = dso_local local_unnamed_addr global i32 0, align 4
42
43define dso_local i32 @main() local_unnamed_addr #0 !dbg !10 {
44entry:
45  %c = alloca [1 x i32], align 4, !DIAssignID !19
46  call void @llvm.dbg.assign(metadata i1 undef, metadata !15, metadata !DIExpression(), metadata !19, metadata ptr %c, metadata !DIExpression()), !dbg !20
47  %0 = load i32, ptr @b, align 4
48  %tobool.not = icmp eq i32 %0, 0
49  br i1 %tobool.not, label %while.end, label %while.body.lr.ph
50
51while.body.lr.ph:                                 ; preds = %entry
52  %arrayidx1 = getelementptr inbounds [1 x i32], ptr %c, i64 0, i64 -1
53  store i32 0, ptr %arrayidx1, align 4
54  br label %while.body
55
56while.body:                                       ; preds = %while.body, %while.body.lr.ph
57  call void @llvm.dbg.assign(metadata i32 0, metadata !15, metadata !DIExpression(), metadata !28, metadata ptr %c, metadata !DIExpression()), !dbg !20
58  br label %while.body
59
60while.end:                                        ; preds = %entry
61  call void @a(ptr noundef nonnull %c)
62  ret i32 0
63}
64
65declare !dbg !31 void @a(ptr noundef) local_unnamed_addr #2
66declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #3
67
68!llvm.dbg.cu = !{!0}
69!llvm.module.flags = !{!2, !3, !8}
70!llvm.ident = !{!9}
71
72!0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang version 17.0.0)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
73!1 = !DIFile(filename: "test.c", directory: "/")
74!2 = !{i32 7, !"Dwarf Version", i32 5}
75!3 = !{i32 2, !"Debug Info Version", i32 3}
76!8 = !{i32 7, !"debug-info-assignment-tracking", i1 true}
77!9 = !{!"clang version 17.0.0"}
78!10 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 4, type: !11, scopeLine: 4, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !14)
79!11 = !DISubroutineType(types: !12)
80!12 = !{!13}
81!13 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
82!14 = !{!15}
83!15 = !DILocalVariable(name: "c", scope: !10, file: !1, line: 5, type: !16)
84!16 = !DICompositeType(tag: DW_TAG_array_type, baseType: !13, size: 32, elements: !17)
85!17 = !{!18}
86!18 = !DISubrange(count: 1)
87!19 = distinct !DIAssignID()
88!20 = !DILocation(line: 0, scope: !10)
89!28 = distinct !DIAssignID()
90!31 = !DISubprogram(name: "a", scope: !1, file: !1, line: 1, type: !32, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !35)
91!32 = !DISubroutineType(types: !33)
92!33 = !{null, !34}
93!34 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64)
94!35 = !{}
95