87 lines
3.7 KiB
LLVM
87 lines
3.7 KiB
LLVM
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; RUN: opt -licm %s -S | FileCheck %s
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; CHECK: for.body:
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; CHECK-NEXT: llvm.dbg.value(metadata i8 undef
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; The load is loop invariant. Check that we leave an undef dbg.value behind
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; when licm sinks the instruction.
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; clang reduce.cpp -g -O2 -Xclang -disable-llvm-passes -emit-llvm -o reduce.ll
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; opt -simplifycfg -sroa -loop-rotate -o - -S reduce.ll
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; cat reduce.cpp
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; extern char a;
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; extern char b;
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; void use(char);
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; void fun() {
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; char local = 0;
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; for (;b;)
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; local = a;
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; use(local);
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; }
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@b = external dso_local global i8, align 1
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@a = external dso_local global i8, align 1
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define dso_local void @_Z3funv() !dbg !12 {
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entry:
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call void @llvm.dbg.value(metadata i8 0, metadata !16, metadata !DIExpression()), !dbg !17
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%0 = load i8, i8* @b, align 1, !dbg !18
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%tobool1 = icmp ne i8 %0, 0, !dbg !18
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br i1 %tobool1, label %for.body.lr.ph, label %for.end, !dbg !24
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for.body.lr.ph: ; preds = %entry
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br label %for.body, !dbg !24
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for.body: ; preds = %for.body.lr.ph, %for.body
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%1 = load i8, i8* @a, align 1, !dbg !25
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call void @llvm.dbg.value(metadata i8 %1, metadata !16, metadata !DIExpression()), !dbg !17
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%2 = load i8, i8* @b, align 1, !dbg !18
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%tobool = icmp ne i8 %2, 0, !dbg !18
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br i1 %tobool, label %for.body, label %for.cond.for.end_crit_edge, !dbg !24, !llvm.loop !26
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for.cond.for.end_crit_edge: ; preds = %for.body
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%split = phi i8 [ %1, %for.body ]
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br label %for.end, !dbg !24
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for.end: ; preds = %for.cond.for.end_crit_edge, %entry
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%local.0.lcssa = phi i8 [ %split, %for.cond.for.end_crit_edge ], [ 0, %entry ], !dbg !17
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call void @llvm.dbg.value(metadata i8 %local.0.lcssa, metadata !16, metadata !DIExpression()), !dbg !17
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call void @_Z3usec(i8 signext %local.0.lcssa), !dbg !28
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ret void, !dbg !29
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}
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declare !dbg !4 dso_local void @_Z3usec(i8 signext)
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!8, !9, !10}
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!llvm.ident = !{!11}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 11.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "reduce.cpp", directory: "/")
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!2 = !{}
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!3 = !{!4}
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!4 = !DISubprogram(name: "use", linkageName: "_Z3usec", scope: !1, file: !1, line: 3, type: !5, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{null, !7}
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!7 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
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!8 = !{i32 7, !"Dwarf Version", i32 4}
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!9 = !{i32 2, !"Debug Info Version", i32 3}
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!10 = !{i32 1, !"wchar_size", i32 4}
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!11 = !{!"clang version 11.0.0"}
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!12 = distinct !DISubprogram(name: "fun", linkageName: "_Z3funv", scope: !1, file: !1, line: 4, type: !13, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !15)
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!13 = !DISubroutineType(types: !14)
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!14 = !{null}
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!15 = !{!16}
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!16 = !DILocalVariable(name: "local", scope: !12, file: !1, line: 5, type: !7)
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!17 = !DILocation(line: 0, scope: !12)
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!18 = !DILocation(line: 6, column: 9, scope: !19)
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!19 = distinct !DILexicalBlock(scope: !20, file: !1, line: 6, column: 3)
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!20 = distinct !DILexicalBlock(scope: !12, file: !1, line: 6, column: 3)
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!24 = !DILocation(line: 6, column: 3, scope: !20)
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!25 = !DILocation(line: 7, column: 13, scope: !19)
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!26 = distinct !{!26, !24, !27}
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!27 = !DILocation(line: 7, column: 13, scope: !20)
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!28 = !DILocation(line: 8, column: 3, scope: !12)
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!29 = !DILocation(line: 9, column: 1, scope: !12)
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