95 lines
3.6 KiB
LLVM
95 lines
3.6 KiB
LLVM
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; RUN: llc %s -stop-after=finalize-isel -o - | FileCheck %s --implicit-check-not=DBG_VALUE
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; RUN: llc --try-experimental-debuginfo-iterators %s -stop-after=finalize-isel -o - | FileCheck %s --implicit-check-not=DBG_VALUE
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;; Check stores to an address computed as a negative offset from an alloca are
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;; ignored by the assignment tracking analysis. For this example that should
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;; result in no DBG_VALUEs in the while.body.lr.ph branch.
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;;
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;; See llvm.org/PR62838 for more info.
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;;
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;; $ clang test.c -O1 -g
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;; $ cat tes.c
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;; void a(int *p);
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;; __attribute__((nodebug)) int b;
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;;
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;; int main() {
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;; int c[1];
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;; __attribute__((nodebug)) int d = -1;
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;;
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;; while (b) {
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;; c[0] = 0;
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;; c[d] = 0;
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;; }
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;; a(c);
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;; return 0;
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;; }
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; CHECK: bb.0.entry:
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; CHECK-NEXT: successors
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; CHECK-NEXT: {{^ *$}}
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; CHECK-NEXT: DBG_VALUE %stack.0.c, $noreg, ![[#]], !DIExpression(DW_OP_deref)
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; CHECK: bb.2.while.body:
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; CHECK-NEXT: successors
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; CHECK-NEXT: {{^ *$}}
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; CHECK-NEXT: DBG_VALUE 0, $noreg, ![[#]], !DIExpression()
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target triple = "x86_64-unknown-linux-gnu"
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@b = dso_local local_unnamed_addr global i32 0, align 4
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define dso_local i32 @main() local_unnamed_addr #0 !dbg !10 {
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entry:
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%c = alloca [1 x i32], align 4, !DIAssignID !19
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call void @llvm.dbg.assign(metadata i1 undef, metadata !15, metadata !DIExpression(), metadata !19, metadata ptr %c, metadata !DIExpression()), !dbg !20
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%0 = load i32, ptr @b, align 4
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%tobool.not = icmp eq i32 %0, 0
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br i1 %tobool.not, label %while.end, label %while.body.lr.ph
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while.body.lr.ph: ; preds = %entry
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%arrayidx1 = getelementptr inbounds [1 x i32], ptr %c, i64 0, i64 -1
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store i32 0, ptr %arrayidx1, align 4
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br label %while.body
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while.body: ; preds = %while.body, %while.body.lr.ph
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call void @llvm.dbg.assign(metadata i32 0, metadata !15, metadata !DIExpression(), metadata !28, metadata ptr %c, metadata !DIExpression()), !dbg !20
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br label %while.body
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while.end: ; preds = %entry
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call void @a(ptr noundef nonnull %c)
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ret i32 0
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}
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declare !dbg !31 void @a(ptr noundef) local_unnamed_addr #2
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declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #3
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!2, !3, !8}
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!llvm.ident = !{!9}
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!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)
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!1 = !DIFile(filename: "test.c", directory: "/")
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!2 = !{i32 7, !"Dwarf Version", i32 5}
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!3 = !{i32 2, !"Debug Info Version", i32 3}
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!8 = !{i32 7, !"debug-info-assignment-tracking", i1 true}
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!9 = !{!"clang version 17.0.0"}
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!10 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 4, type: !11, scopeLine: 4, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !14)
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!11 = !DISubroutineType(types: !12)
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!12 = !{!13}
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!13 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!14 = !{!15}
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!15 = !DILocalVariable(name: "c", scope: !10, file: !1, line: 5, type: !16)
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!16 = !DICompositeType(tag: DW_TAG_array_type, baseType: !13, size: 32, elements: !17)
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!17 = !{!18}
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!18 = !DISubrange(count: 1)
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!19 = distinct !DIAssignID()
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!20 = !DILocation(line: 0, scope: !10)
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!28 = distinct !DIAssignID()
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!31 = !DISubprogram(name: "a", scope: !1, file: !1, line: 1, type: !32, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !35)
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!32 = !DISubroutineType(types: !33)
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!33 = !{null, !34}
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!34 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64)
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!35 = !{}
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