125 lines
6.0 KiB
LLVM
125 lines
6.0 KiB
LLVM
; RUN: opt -mem2reg %s -S -o - | FileCheck %s
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;; Check that mem2reg removes dbg.value(%local, DIExpression(DW_OP_deref...))
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;; that instcombine LowerDbgDeclare inserted before the call to 'esc' when
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;; promoting the alloca %local after 'esc' has been inlined. Without this we
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;; provide no location for 'local', even though it is provably constant
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;; throughout after inlining.
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;;
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;; $ clang reduce.c -O2 -g -emit-llvm -S -o tmp.ll -Xclang -disable-llvm-passes
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;; $ opt tmp.ll -o - -instcombine -inline -S
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;; $ cat reduce.c
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;; long a;
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;; int b;
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;; void c();
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;; __attribute__((__always_inline__))
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;; static void esc(long *e) {
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;; *e = a;
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;; c();
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;; if (b)
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;; *e = 0;
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;; }
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;;
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;; void fun() {
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;; long local = 0;
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;; esc(&local);
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;; }
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; CHECK: define dso_local void @fun()
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i64 0, metadata ![[LOCAL:[0-9]+]], metadata !DIExpression())
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; CHECK-NOT: call void @llvm.dbg.value({{.*}}, metadata ![[LOCAL]]
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; CHECK: ![[LOCAL]] = !DILocalVariable(name: "local",
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@a = dso_local global i64 0, align 8, !dbg !0
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@b = dso_local global i32 0, align 4, !dbg !6
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define dso_local void @fun() !dbg !14 {
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entry:
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%e.addr.i = alloca i64*, align 8
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%local = alloca i64, align 8
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%0 = bitcast i64* %local to i8*, !dbg !19
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call void @llvm.lifetime.start.p0i8(i64 8, i8* nonnull %0), !dbg !19
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call void @llvm.dbg.value(metadata i64 0, metadata !18, metadata !DIExpression()), !dbg !20
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store i64 0, i64* %local, align 8, !dbg !21
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call void @llvm.dbg.value(metadata i64* %local, metadata !18, metadata !DIExpression(DW_OP_deref)), !dbg !20
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%1 = bitcast i64** %e.addr.i to i8*, !dbg !26
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call void @llvm.lifetime.start.p0i8(i64 8, i8* %1), !dbg !26
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call void @llvm.dbg.value(metadata i64* %local, metadata !32, metadata !DIExpression()), !dbg !26
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store i64* %local, i64** %e.addr.i, align 8
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%2 = load i64, i64* @a, align 8, !dbg !36
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call void @llvm.dbg.value(metadata i64* %local, metadata !32, metadata !DIExpression()), !dbg !26
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store i64 %2, i64* %local, align 8, !dbg !37
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call void (...) @c(), !dbg !38
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%3 = load i32, i32* @b, align 4, !dbg !39
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%tobool.not.i = icmp eq i32 %3, 0, !dbg !39
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br i1 %tobool.not.i, label %esc.exit, label %if.then.i, !dbg !43
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if.then.i: ; preds = %entry
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%4 = load i64*, i64** %e.addr.i, align 8, !dbg !44
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call void @llvm.dbg.value(metadata i64* %4, metadata !32, metadata !DIExpression()), !dbg !26
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store i64 0, i64* %4, align 8, !dbg !45
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br label %esc.exit, !dbg !46
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esc.exit: ; preds = %entry, %if.then.i
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%5 = bitcast i64** %e.addr.i to i8*, !dbg !47
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call void @llvm.lifetime.end.p0i8(i64 8, i8* %5), !dbg !47
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%6 = bitcast i64* %local to i8*, !dbg !48
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call void @llvm.lifetime.end.p0i8(i64 8, i8* nonnull %6), !dbg !48
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ret void, !dbg !48
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}
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declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture)
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declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture)
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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declare !dbg !49 dso_local void @c(...)
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!10, !11, !12}
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!llvm.ident = !{!13}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !9, isLocal: false, isDefinition: true)
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!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)
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!3 = !DIFile(filename: "reduce.c", directory: "/")
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!4 = !{}
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!5 = !{!0, !6}
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!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
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!7 = distinct !DIGlobalVariable(name: "b", scope: !2, file: !3, line: 2, type: !8, isLocal: false, isDefinition: true)
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!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!9 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
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!10 = !{i32 7, !"Dwarf Version", i32 4}
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!11 = !{i32 2, !"Debug Info Version", i32 3}
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!12 = !{i32 1, !"wchar_size", i32 4}
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!13 = !{!"clang version 12.0.0"}
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!14 = distinct !DISubprogram(name: "fun", scope: !3, file: !3, line: 12, type: !15, scopeLine: 12, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !17)
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!15 = !DISubroutineType(types: !16)
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!16 = !{null}
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!17 = !{!18}
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!18 = !DILocalVariable(name: "local", scope: !14, file: !3, line: 13, type: !9)
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!19 = !DILocation(line: 13, column: 3, scope: !14)
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!20 = !DILocation(line: 0, scope: !14)
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!21 = !DILocation(line: 13, column: 8, scope: !14)
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!26 = !DILocation(line: 0, scope: !27, inlinedAt: !33)
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!27 = distinct !DISubprogram(name: "esc", scope: !3, file: !3, line: 5, type: !28, scopeLine: 5, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !31)
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!28 = !DISubroutineType(types: !29)
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!29 = !{null, !30}
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!30 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64)
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!31 = !{!32}
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!32 = !DILocalVariable(name: "e", arg: 1, scope: !27, file: !3, line: 5, type: !30)
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!33 = distinct !DILocation(line: 14, column: 3, scope: !14)
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!36 = !DILocation(line: 6, column: 8, scope: !27, inlinedAt: !33)
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!37 = !DILocation(line: 6, column: 6, scope: !27, inlinedAt: !33)
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!38 = !DILocation(line: 7, column: 3, scope: !27, inlinedAt: !33)
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!39 = !DILocation(line: 8, column: 7, scope: !40, inlinedAt: !33)
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!40 = distinct !DILexicalBlock(scope: !27, file: !3, line: 8, column: 7)
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!43 = !DILocation(line: 8, column: 7, scope: !27, inlinedAt: !33)
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!44 = !DILocation(line: 9, column: 6, scope: !40, inlinedAt: !33)
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!45 = !DILocation(line: 9, column: 8, scope: !40, inlinedAt: !33)
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!46 = !DILocation(line: 9, column: 5, scope: !40, inlinedAt: !33)
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!47 = !DILocation(line: 10, column: 1, scope: !27, inlinedAt: !33)
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!48 = !DILocation(line: 15, column: 1, scope: !14)
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!49 = !DISubprogram(name: "c", scope: !3, file: !3, line: 3, type: !50, spFlags: DISPFlagOptimized, retainedNodes: !4)
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!50 = !DISubroutineType(types: !51)
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!51 = !{null, null}
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