122 lines
5.9 KiB
LLVM
122 lines
5.9 KiB
LLVM
; RUN: llc %s -stop-after=finalize-isel -o - \
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; RUN: | FileCheck %s --implicit-check-not=DBG_
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; RUN: llc --try-experimental-debuginfo-iterators %s -stop-after=finalize-isel -o - \
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; RUN: | FileCheck %s --implicit-check-not=DBG_
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;; Hand written to test scenario we can definitely run into in the wild. This
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;; file name includes "diamond" because the idea is that we lose (while
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;; optimizing) one of the diamond branches which was empty except for a debug
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;; intrinsic. In this case, the debug intrinsic linked to the common-and-sunk
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;; store now in if.end. So we've got this:
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;;
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;; entry: ; -> br if.then, if.end
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;; mem(a) = !19
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;; dbg(a) = !21 ; dbg and mem disagree, don't use mem loc.
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;; if.then: ; -> br if.end
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;; dbg(a) = !20
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;; if.end:
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;; mem(a) = !20 ; two preds disagree that !20 is the last assignment, don't
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;; ; use mem loc.
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;; ; This feels highly unfortunate, and highlights the need to reinstate the
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;; ; memory location at call sites leaking the address (in an ideal world,
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;; ; the memory location would always be in use at that point and so this
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;; ; wouldn't be necessary).
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;; esc(a) ; force the memory location
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;; In real world examples this is caused by InstCombine sinking common code
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;; followed by SimplifyCFG deleting empty-except-for-dbg blocks.
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; CHECK-DAG: ![[A:[0-9]+]] = !DILocalVariable(name: "a",
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; CHECK-LABEL: bb.0.entry:
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; CHECK: DBG_VALUE $edi, $noreg, ![[A]], !DIExpression()
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; CHECK-LABEL: bb.1.if.then:
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; CHECK: DBG_VALUE 0, $noreg, ![[A]], !DIExpression()
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;; === TODO / WISHLIST ===
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; LEBAL-KCEHC: bb.2.if.end:
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; KCEHC: CALL64pcrel32 target-flags(x86-plt) @es
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; KCEHC: DBG_VALUE %stack.0.a.addr, $noreg, ![[A]], !DIExpression(DW_OP_deref)
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target triple = "x86_64-unknown-linux-gnu"
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@g = dso_local local_unnamed_addr global ptr null, align 8, !dbg !0
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define dso_local noundef i32 @_Z1fiii(i32 noundef %a, i32 noundef %b, i32 noundef %c) local_unnamed_addr #0 !dbg !12 {
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entry:
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%a.addr = alloca i32, align 4, !DIAssignID !19
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call void @llvm.dbg.assign(metadata i1 undef, metadata !16, metadata !DIExpression(), metadata !19, metadata ptr %a.addr, metadata !DIExpression()), !dbg !20
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call void @llvm.dbg.assign(metadata i32 %a, metadata !16, metadata !DIExpression(), metadata !21, metadata ptr %a.addr, metadata !DIExpression()), !dbg !20
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%tobool.not = icmp eq i32 %c, 0
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br i1 %tobool.not, label %if.then, label %if.end
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if.then:
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call void @e()
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call void @llvm.dbg.assign(metadata i32 0, metadata !16, metadata !DIExpression(), metadata !22, metadata ptr %a.addr, metadata !DIExpression()), !dbg !20
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br label %if.end
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if.end: ; preds = %do.body
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store i32 0, ptr %a.addr, align 4, !DIAssignID !22
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call void @es(ptr %a.addr)
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ret i32 0
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}
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declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #2
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declare void @e()
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declare void @es(ptr)
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!7, !8, !9, !10, !1000}
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!llvm.ident = !{!11}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "g", scope: !2, file: !3, line: 4, type: !5, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !3, producer: "clang version 14.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, globals: !4, splitDebugInlining: false, nameTableKind: None)
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!3 = !DIFile(filename: "test.cpp", directory: "/")
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!4 = !{!0}
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!5 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !6, size: 64)
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!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!7 = !{i32 7, !"Dwarf Version", i32 5}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{i32 1, !"wchar_size", i32 4}
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!10 = !{i32 7, !"uwtable", i32 1}
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!11 = !{!"clang version 14.0.0"}
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!12 = distinct !DISubprogram(name: "f", linkageName: "_Z1fiii", scope: !3, file: !3, line: 5, type: !13, scopeLine: 5, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !15)
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!13 = !DISubroutineType(types: !14)
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!14 = !{!6, !6, !6, !6}
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!15 = !{!16, !17, !18}
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!16 = !DILocalVariable(name: "a", arg: 1, scope: !12, file: !3, line: 5, type: !6)
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!17 = !DILocalVariable(name: "b", arg: 2, scope: !12, file: !3, line: 5, type: !6)
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!18 = !DILocalVariable(name: "c", arg: 3, scope: !12, file: !3, line: 5, type: !6)
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!19 = distinct !DIAssignID()
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!20 = !DILocation(line: 0, scope: !12)
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!21 = distinct !DIAssignID()
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!22 = distinct !DIAssignID()
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!23 = distinct !DIAssignID()
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!28 = distinct !DIAssignID()
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!29 = !DILocation(line: 6, column: 3, scope: !12)
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!30 = !DILocation(line: 8, column: 7, scope: !31)
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!31 = distinct !DILexicalBlock(scope: !12, file: !3, line: 6, column: 6)
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!32 = distinct !DIAssignID()
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!33 = !DILocation(line: 10, column: 5, scope: !31)
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!34 = !DILocation(line: 11, column: 12, scope: !12)
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!35 = !DILocation(line: 11, column: 3, scope: !31)
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!36 = distinct !{!36, !29, !37, !38}
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!37 = !DILocation(line: 11, column: 15, scope: !12)
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!38 = !{!"llvm.loop.mustprogress"}
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!39 = !DILocation(line: 12, column: 3, scope: !12)
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!40 = !DILocation(line: 13, column: 10, scope: !12)
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!41 = !DILocation(line: 13, column: 12, scope: !12)
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!42 = !DILocation(line: 13, column: 3, scope: !12)
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!43 = !DISubprogram(name: "e", linkageName: "_Z1ev", scope: !3, file: !3, line: 2, type: !44, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !46)
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!44 = !DISubroutineType(types: !45)
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!45 = !{null}
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!46 = !{}
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!47 = !DISubprogram(name: "d", linkageName: "_Z1dv", scope: !3, file: !3, line: 1, type: !48, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !46)
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!48 = !DISubroutineType(types: !49)
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!49 = !{!6}
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!50 = !DISubprogram(name: "es", linkageName: "_Z2esPi", scope: !3, file: !3, line: 3, type: !51, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !46)
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!51 = !DISubroutineType(types: !52)
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!52 = !{null, !5}
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!1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true}
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