8763d79949
Explicitly inserting undef is overly defensive. Any values computed nside the loop that are referenced by dbg.values should naturally become undef when the loop is deleted, and all other values that are loop invariant must be preserved. Reviewed By: scott.linder Differential Revision: https://reviews.llvm.org/D153539
81 lines
4.0 KiB
LLVM
81 lines
4.0 KiB
LLVM
; RUN: opt %s -passes=loop-deletion -S -o - \
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; RUN: | FileCheck %s
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;; $ cat test.cpp:
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;; void esc(int*);
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;; void fun() {
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;; int Counter = 0;
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;; for (; Counter < 2; Counter++) {}
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;; esc(&Counter);
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;; }
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;;
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;; IR grabbed before loop-deletion in:
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;; $ clang++ -O2 -g -Xclang -fexperimental-assignment-tracking
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;;
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;; for.cond is a dead loop - the debug intrinsic inside will be moved to the
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;; exit block (and made undef) and then the loop will be deleted. Ensure that
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;; the dbg.assign intrinsic doesn't get transformed into a dbg.value by
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;; mistake.
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; CHECK: for.end:
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; CHECK-NEXT: call void @llvm.dbg.assign(metadata i32 undef,{{.+}}, metadata !DIExpression({{.+}}), metadata ![[ID:[0-9]+]], metadata ptr %Counter, metadata !DIExpression())
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; CHECK-NEXT: store i32 2, ptr %Counter, align 4,{{.*}}!DIAssignID ![[ID]]
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define dso_local void @_Z3funv() local_unnamed_addr #0 !dbg !7 {
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entry:
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%Counter = alloca i32, align 4, !DIAssignID !13
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call void @llvm.dbg.assign(metadata i1 undef, metadata !11, metadata !DIExpression(), metadata !13, metadata ptr %Counter, metadata !DIExpression()), !dbg !14
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call void @llvm.dbg.assign(metadata i32 0, metadata !11, metadata !DIExpression(), metadata !16, metadata ptr %Counter, metadata !DIExpression()), !dbg !14
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br label %for.cond, !dbg !17
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for.cond: ; preds = %for.cond, %entry
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call void @llvm.dbg.assign(metadata i32 undef, metadata !11, metadata !DIExpression(DW_OP_plus_uconst, 1, DW_OP_stack_value), metadata !16, metadata ptr %Counter, metadata !DIExpression()), !dbg !14
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br i1 false, label %for.cond, label %for.end, !dbg !18, !llvm.loop !20
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for.end: ; preds = %for.cond
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store i32 2, ptr %Counter, align 4, !dbg !14, !DIAssignID !16
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call void @_Z3escPi(ptr noundef nonnull %Counter), !dbg !27
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ret void, !dbg !28
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}
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declare void @llvm.lifetime.start.p0i8(i64 immarg, ptr nocapture)
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declare !dbg !29 dso_local void @_Z3escPi(ptr noundef) local_unnamed_addr
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declare void @llvm.lifetime.end.p0i8(i64 immarg, ptr nocapture)
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declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!2, !3, !4, !5, !1000}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 14.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "test.cpp", 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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!4 = !{i32 1, !"wchar_size", i32 4}
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!5 = !{i32 7, !"uwtable", i32 1}
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!6 = !{!"clang version 14.0.0)"}
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!7 = distinct !DISubprogram(name: "fun", linkageName: "_Z3funv", scope: !1, file: !1, line: 2, type: !8, scopeLine: 2, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !10)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null}
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!10 = !{!11}
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!11 = !DILocalVariable(name: "Counter", scope: !7, file: !1, line: 3, type: !12)
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!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!13 = distinct !DIAssignID()
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!14 = !DILocation(line: 0, scope: !7)
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!15 = !DILocation(line: 3, column: 3, scope: !7)
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!16 = distinct !DIAssignID()
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!17 = !DILocation(line: 4, column: 3, scope: !7)
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!18 = !DILocation(line: 4, column: 3, scope: !19)
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!19 = distinct !DILexicalBlock(scope: !7, file: !1, line: 4, column: 3)
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!20 = distinct !{!20, !18, !21, !22}
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!21 = !DILocation(line: 4, column: 35, scope: !19)
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!22 = !{!"llvm.loop.mustprogress"}
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!27 = !DILocation(line: 5, column: 3, scope: !7)
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!28 = !DILocation(line: 6, column: 1, scope: !7)
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!29 = !DISubprogram(name: "esc", linkageName: "_Z3escPi", scope: !1, file: !1, line: 1, type: !30, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !33)
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!30 = !DISubroutineType(types: !31)
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!31 = !{null, !32}
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!32 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
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!33 = !{}
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!1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true}
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