1--- | 2 ; RUN: llc %s -march=x86-64 -run-pass=livedebugvalues -o - -experimental-debug-variable-locations -emulate-old-livedebugvalues=0 | FileCheck %s -implicit-check-not=DBG_VALUE 3 4 ; Sometimes, variables can have multiple locations, and when control flow 5 ; merges LiveDebugValues has a hard time picking which one the variable lives 6 ; in. Test two of these scenarios that old LiveDebugValues can't handle: when 7 ; a value is in two registers, and when a value is both in a register and 8 ; on the stack. 9 10 ; In a register: 11 12 ; CHECK-LABEL: bb.0.entry: 13 ; CHECK: DBG_VALUE $rdi, $noreg, !16, !DIExpression() 14 ; CHECK-LABEL: bb.1.bb1: 15 ; CHECK: DBG_VALUE $rbp, $noreg, !16, !DIExpression() 16 ; CHECK: DBG_VALUE $rbp, $noreg, !16, !DIExpression() 17 ; CHECK-LABEL: bb.2.bb2: 18 ; CHECK: DBG_VALUE $rbp, $noreg, !16, !DIExpression() 19 ; CHECK-LABEL: bb.3.bb3: 20 ; CHECK: DBG_VALUE $rbp, $noreg, !16, !DIExpression() 21 22 ; On the stack: we move from $rbp to a stack slot in bb4, but join back on 23 ; $rbp in bb6. 24 25 ; CHECK-LABEL: bb.4: 26 ; CHECK: DBG_VALUE $rbp, $noreg, !16, !DIExpression() 27 ; CHECK: DBG_VALUE $rsp, 0, !16, !DIExpression() 28 ; CHECK-LABEL: bb.5: 29 ; CHECK: DBG_VALUE $rbp, $noreg, !16, !DIExpression() 30 ; CHECK-LABEL: bb.6: 31 ; CHECK: DBG_VALUE $rbp, $noreg, !16, !DIExpression() 32 33 declare i64 @bees(i64 %arg); 34 35 define i32 @_Z8bb_to_bb(i64 %arg) local_unnamed_addr !dbg !12 { 36 entry: 37 br label %bb1, !dbg !17 38 bb1: 39 br label %bb2, !dbg !17 40 bb2: 41 br label %bb3, !dbg !17 42 bb3: 43 ret i32 0, !dbg !17 44 } 45 46 !llvm.dbg.cu = !{!0} 47 !llvm.module.flags = !{!7, !8, !9, !10} 48 !llvm.ident = !{!11} 49 !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !3, debugInfoForProfiling: true, nameTableKind: None) 50 !1 = !DIFile(filename: "main.cpp", directory: "F:\") 51 !2 = !{} 52 !3 = !{!4} 53 !4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression()) 54 !5 = distinct !DIGlobalVariable(name: "start", scope: !0, file: !1, line: 4, type: !6, isLocal: false, isDefinition: true) 55 !6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 56 !7 = !{i32 2, !"Dwarf Version", i32 4} 57 !8 = !{i32 2, !"Debug Info Version", i32 3} 58 !9 = !{i32 1, !"wchar_size", i32 2} 59 !10 = !{i32 7, !"PIC Level", i32 2} 60 !11 = !{!"clang version 10.0.0"} 61 !12 = distinct !DISubprogram(name: "bb_to_bb", linkageName: "bb_to_bb", scope: !1, file: !1, line: 6, type: !13, scopeLine: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !15) 62 !13 = !DISubroutineType(types: !14) 63 !14 = !{!6, !6} 64 !15 = !{!16} 65 !16 = !DILocalVariable(name: "myVar", scope: !12, file: !1, line: 7, type: !6) 66 !17 = !DILocation(line: 10, scope: !12) 67 68... 69--- 70name: _Z8bb_to_bb 71tracksRegLiveness: true 72liveins: 73 - { reg: '$rdi', virtual-reg: '' } 74stack: 75 - { id: 0, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8, 76 stack-id: default, callee-saved-register: '', callee-saved-restored: true, 77 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' } 78body: | 79 bb.0.entry: 80 liveins: $rdi 81 successors: %bb.1, %bb.2 82 DBG_VALUE $rdi, $noreg, !16, !DIExpression(), debug-location !17 83 $rbp = MOV64rr $rdi, debug-location !17 84 dead $rcx = MOV64ri 0, debug-location !17 85 CALL64pcrel32 @bees, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def $rax, debug-location !17 86 CMP64ri8 renamable $rax, 1, implicit-def $eflags, debug-location !17 87 JCC_1 %bb.2, 4, implicit killed $eflags, debug-location !17 88 bb.1.bb1: 89 liveins: $rax, $rbp 90 successors: %bb.3 91 $rbp = MOV64ri 0, debug-location !17 92 DBG_VALUE $rbp, $noreg, !16, !DIExpression(), debug-location !17 93 JMP_1 %bb.3 94 bb.2.bb2: 95 liveins: $rax, $rbp 96 successors: %bb.3 97 $rax = MOV64ri 0, debug-location !17 98 bb.3.bb3: 99 liveins: $rax, $rbp 100 $rdi = MOV64rr $rbp, debug-location !17 101 CALL64pcrel32 @bees, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def $rax, debug-location !17 102 CMP64ri8 renamable $rax, 1, implicit-def $eflags, debug-location !17 103 JCC_1 %bb.5, 4, implicit killed $eflags, debug-location !17 104 bb.4: 105 liveins: $rax, $rbp 106 MOV64mr $rsp, 1, $noreg, 8, $noreg, killed renamable $rbp :: (store 8 into %stack.0) 107 JMP_1 %bb.6 108 bb.5: 109 liveins: $rax, $rbp 110 bb.6: 111 liveins: $rax, $rbp 112 RETQ $rax, debug-location !17 113... 114