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7d6813a6c8
This change simplifies code that has to deal with DIGlobalVariableExpression and mirrors how we treat DIExpressions in debug info intrinsics. Before this change there were two ways of representing empty expressions on globals, a nullptr and an empty !DIExpression(). If someone needs to upgrade out-of-tree testcases: perl -pi -e 's/(!DIGlobalVariableExpression\(var: ![0-9]*)\)/\1, expr: !DIExpression())/g' <MYTEST.ll> will catch 95%. llvm-svn: 312144
108 lines
4.4 KiB
LLVM
108 lines
4.4 KiB
LLVM
; RUN: opt < %s -gvn -S | FileCheck %s
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;
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; Produced at -O2 from:
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; int a, b;
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; void f1(int *p1) {
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; if (b)
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; a = 1;
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; if (a && *p1)
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; f4();
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; }
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; int f2(int);
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; void f3(void) {
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; a = f2(1);
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; f1(&a);
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; }
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source_filename = "test/DebugInfo/Generic/gvn.ll"
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target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
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target triple = "arm64-apple-ios"
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@a = common global i32 0, align 4, !dbg !0
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@b = common global i32 0, align 4, !dbg !6
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; Function Attrs: nounwind
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define void @f3() #0 !dbg !12 {
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entry:
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; Verify that the call still has a debug location after GVN.
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; CHECK: %call = tail call i32 @f2(i32 1) #{{[0-9]}}, !dbg
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%call = tail call i32 @f2(i32 1) #0, !dbg !15
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store i32 %call, i32* @a, align 4, !dbg !15, !tbaa !24
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tail call void @llvm.dbg.value(metadata i32* @a, metadata !22, metadata !28) #0, !dbg !29
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%0 = load i32, i32* @b, align 4, !dbg !29, !tbaa !24
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%tobool.i = icmp eq i32 %0, 0, !dbg !29
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br i1 %tobool.i, label %if.end.i, label %land.lhs.true.i.thread, !dbg !30
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land.lhs.true.i.thread: ; preds = %entry
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store i32 1, i32* @a, align 4, !dbg !32, !tbaa !24
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br label %if.then.3.i, !dbg !33
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; This instruction has no debug location -- in this
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; particular case it was removed by a bug in SimplifyCFG.
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if.end.i: ; preds = %entry
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%.pr = load i32, i32* @a, align 4
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; GVN is supposed to replace the load of %.pr with a direct reference to %call.
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; CHECK: %tobool2.i = icmp eq i32 %call, 0, !dbg
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%tobool2.i = icmp eq i32 %.pr, 0, !dbg !34
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br i1 %tobool2.i, label %f1.exit, label %if.then.3.i, !dbg !34
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if.then.3.i: ; preds = %if.end.i, %land.lhs.true.i.thread
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%call.i = tail call i32 bitcast (i32 (...)* @f4 to i32 ()*)() #0, !dbg !35
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br label %f1.exit, !dbg !35
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f1.exit: ; preds = %if.then.3.i, %if.end.i
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ret void, !dbg !36
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}
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declare i32 @f2(i32)
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declare i32 @f4(...)
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { nounwind }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!9, !10}
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!llvm.ident = !{!11}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 3.8.0 (trunk 245562) (llvm/trunk 245569)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
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!3 = !DIFile(filename: "test.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 = !DIGlobalVariable(name: "b", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true)
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!8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !{i32 2, !"Dwarf Version", i32 2}
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!10 = !{i32 2, !"Debug Info Version", i32 3}
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!11 = !{!"clang version 3.8.0 (trunk 245562) (llvm/trunk 245569)"}
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!12 = distinct !DISubprogram(name: "f3", scope: !3, file: !3, line: 9, type: !13, isLocal: false, isDefinition: true, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: true, unit: !2, variables: !4)
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!13 = !DISubroutineType(types: !14)
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!14 = !{null}
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!15 = !DILocation(line: 5, scope: !16, inlinedAt: !23)
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!16 = distinct !DILexicalBlock(scope: !17, file: !3, line: 5)
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!17 = distinct !DISubprogram(name: "f1", scope: !3, file: !3, line: 2, type: !18, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !2, variables: !21)
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!18 = !DISubroutineType(types: !19)
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!19 = !{null, !20}
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!20 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 64, align: 64)
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!21 = !{!22}
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!22 = !DILocalVariable(name: "p1", arg: 1, scope: !17, file: !3, line: 2, type: !20)
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!23 = distinct !DILocation(line: 11, scope: !12)
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!24 = !{!25, !25, i64 0}
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!25 = !{!"int", !26, i64 0}
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!26 = !{!"omnipotent char", !27, i64 0}
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!27 = !{!"Simple C/C++ TBAA"}
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!28 = !DIExpression()
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!29 = !DILocation(line: 2, scope: !17, inlinedAt: !23)
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!30 = !DILocation(line: 3, scope: !31, inlinedAt: !23)
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!31 = distinct !DILexicalBlock(scope: !17, file: !3, line: 3)
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!32 = !DILocation(line: 3, scope: !17, inlinedAt: !23)
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!33 = !DILocation(line: 4, scope: !31, inlinedAt: !23)
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!34 = !DILocation(line: 5, scope: !17, inlinedAt: !23)
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!35 = !DILocation(line: 6, scope: !16, inlinedAt: !23)
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!36 = !DILocation(line: 12, scope: !12)
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