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1# RUN: llc %s -o - -run-pass=livedebugvalues \2# RUN: -experimental-debug-variable-locations \3# RUN: | FileCheck %s4#5# This test used to cause an infinite loop in InstrRefBasedLDV. Observe block6# five: on the first entry the desired variable value is in $rdx and $rcx, on7# both paths to the block. However, the block rotates values between those8# registers, and feeds a zero-value in too. Ultimately, there is no correct9# location for the variable in that block.10# This caused an infinite loop in a previous implementation of LiveDebugValues.11# Keep this around as a regression test, and check that no location is picked12# in block 5.13#14# CHECK-LABEL: bb.3:15# CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(7, 0)16# CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $rdx17# CHECK-NEXT: $rcx = MOV64rr $rdx18# CHECK-LABEL: bb.4:19# CHECK: DBG_VALUE_LIST {{.+}}, $rcx20# CHECK-NEXT: $rdx = MOV64rr killed $rcx21# CHECK-LABEL: bb.5:22# CHECK-NOT: DBG_VALUE23--- |24 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"25 target triple = "x86_64-unknown-linux-gnu"26 27 ; Function Attrs: nofree norecurse nosync nounwind readonly uwtable28 define dso_local void @bees() local_unnamed_addr !dbg !13 {29 entry:30 ret void, !dbg !2231 }32 33 ; Function Attrs: nofree nosync nounwind readnone speculatable willreturn34 declare void @llvm.dbg.value(metadata, metadata, metadata)35 36 !llvm.dbg.cu = !{!2}37 !llvm.module.flags = !{!8, !9, !10, !11}38 !llvm.ident = !{!12}39 40 !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())41 !1 = distinct !DIGlobalVariable(name: "xmlNormalizeURIPath_path", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)42 !2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 10.0 (git@github.com:llvm/llvm-project 9d8de79d09c9560c094d90b010e8315fe2712ec2)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)43 !3 = !DIFile(filename: "test4.c", directory: "/tmp")44 !4 = !{}45 !5 = !{!0}46 !6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64)47 !7 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)48 !8 = !{i32 7, !"Dwarf Version", i32 4}49 !9 = !{i32 2, !"Debug Info Version", i32 3}50 !10 = !{i32 1, !"wchar_size", i32 4}51 !11 = !{i32 7, !"uwtable", i32 1}52 !12 = !{!"clang version 10.0 (git@github.com:llvm/llvm-project 9d8de79d09c9560c094d90b010e8315fe2712ec2)"}53 !13 = distinct !DISubprogram(name: "xmlNormalizeURIPath", scope: !3, file: !3, line: 2, type: !14, scopeLine: 2, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !16)54 !14 = !DISubroutineType(types: !15)55 !15 = !{null}56 !16 = !{!17, !18}57 !17 = !DILocalVariable(name: "cur", scope: !13, file: !3, line: 3, type: !6)58 !18 = !DILocalVariable(name: "segp", scope: !19, file: !3, line: 5, type: !6)59 !19 = distinct !DILexicalBlock(scope: !13, file: !3, line: 4, column: 13)60 !20 = !DILocation(line: 4, column: 3, scope: !13)61 !21 = !DILocation(line: 0, scope: !13)62 !22 = !DILocation(line: 0, scope: !19)63 !23 = !DILocation(line: 6, column: 5, scope: !19)64 !24 = !DILocation(line: 6, column: 12, scope: !19)65 !25 = !{!26, !26, i64 0}66 !26 = !{!"omnipotent char", !27, i64 0}67 !27 = !{!"Simple C/C++ TBAA"}68 !28 = !DILocation(line: 6, column: 27, scope: !19)69 !29 = !DILocation(line: 7, column: 7, scope: !19)70 !30 = distinct !{!30, !23, !31, !32, !33}71 !31 = !DILocation(line: 7, column: 9, scope: !19)72 !32 = !{!"llvm.loop.mustprogress"}73 !33 = !{!"llvm.loop.unroll.disable"}74 75...76---77name: bees78alignment: 1679tracksRegLiveness: true80debugInstrRef: true81frameInfo:82 maxAlignment: 183 maxCallFrameSize: 084machineFunctionInfo: {}85body: |86 bb.0:87 $rdx = MOV64ri 0, implicit-def $eflags88 $esi = MOV32ri 0, implicit-def $eflags89 90 bb.1:91 successors: %bb.2(0x03e0f83e), %bb.1(0x7c1f07c2)92 liveins: $rcx, $rdi, $rdx, $eflags93 94 DBG_PHI $rcx, 295 DBG_INSTR_REF !18, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0), debug-location !2296 JCC_1 %bb.1, 4, implicit $eflags, debug-location !2297 98 bb.2:99 successors: %bb.4(0x30000000), %bb.3(0x50000000)100 liveins: $rcx, $rdi, $eflags101 102 JCC_1 %bb.4, 4, implicit $eflags, debug-location !22103 104 bb.3:105 successors: %bb.5(0x04000000)106 liveins: $rcx, $rdi, $eflags107 108 $rdx = MOV64ri 0, debug-instr-number 7, debug-location !22109 DBG_INSTR_REF !18, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(7, 0), debug-location !22110 $rcx = MOV64rr $rdx111 JMP_1 %bb.5, debug-location !22112 113 bb.4:114 liveins: $rcx, $rdi, $eflags115 116 $rdx = MOV64rr killed $rcx, debug-location !22117 118 bb.5:119 successors: %bb.5(0x7c000000), %bb.6(0x04000000)120 liveins: $rdi, $rdx, $eflags121 122 $rcx = MOV64rr $rdx, debug-location !22123 $rdx = MOV64ri 0 ; jmorse -- disabling this makes variable live-through124 JCC_1 %bb.5, 6, implicit $eflags, debug-location !22125 126 bb.6:127 RET64 debug-location !22128 129...130