1; RUN: llc -O3 -verify-machineinstrs -mtriple=aarch64-none-linux-gnu -print-after virtregrewriter < %s >%t 2>&1 && FileCheck <%t %s 2 3; This test checks that DBG_VALUE instruction placed correctly. 4; Specifically: if Register Allocator inserts additional instructions 5; in the beginning of basic block then it should not break placement 6; of DBG_VALUE for loop index variable. That DBG_VALUE instruction 7; for "i" variable should be placed before any real loop instruction. 8; https://reviews.llvm.org/D62650 9 10; Created from the following C source: 11 12; cat test_debug_val.cpp 13; 14; void func(int, ...); 15; 16; int array[0x100]; 17; 18; int main( int argc, char **argv ) 19; { 20; int var = 56; 21; 22; int a1 = array[1]; int a2 = array[2]; int a3 = array[3]; int a4 = array[4]; 23; int a5 = array[5]; int a6 = array[6]; int a7 = array[7]; int a8 = array[8]; 24; int a9 = array[9]; int a10 = array[10]; 25; 26; for( int i = 0; i < 0x100; i++ ) { 27; 28; array[i] = var; 29; 30; func(0, i, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10 ); 31; } 32; 33; return 0; 34; } 35; 36; 37; clang -O3 -g -c --target=aarch64-unknown-linux -std=gnu++14 test_debug_val.cpp -emit-llvm -S -o - 38 39 40; CHECK: bb.2.for.body 41; CHECK-NEXT: predecessors 42; CHECK-NEXT: successors 43; CHECK-NEXT: liveins 44; CHECK-NOT: MOV 45; CHECK: DBG_VALUE $[[REG:[xw][0-9]+]], $noreg, !"i" 46; CHECK: MOV 47 48; ModuleID = 'test_debug_val.cpp' 49source_filename = "test_debug_val.cpp" 50target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128" 51target triple = "aarch64-unknown-linux" 52 53@array = dso_local local_unnamed_addr global [256 x i32] zeroinitializer, align 4, !dbg !0 54 55; Function Attrs: norecurse 56define dso_local i32 @main(i32 %argc, ptr nocapture readnone %argv) local_unnamed_addr #0 !dbg !14 { 57entry: 58 call void @llvm.dbg.value(metadata i32 %argc, metadata !21, metadata !DIExpression()), !dbg !36 59 call void @llvm.dbg.value(metadata ptr %argv, metadata !22, metadata !DIExpression()), !dbg !36 60 call void @llvm.dbg.value(metadata i32 56, metadata !23, metadata !DIExpression()), !dbg !36 61 %0 = load i32, ptr getelementptr inbounds ([256 x i32], ptr @array, i64 0, i64 1), align 4, !dbg !37 62 call void @llvm.dbg.value(metadata i32 %0, metadata !24, metadata !DIExpression()), !dbg !36 63 %1 = load i32, ptr getelementptr inbounds ([256 x i32], ptr @array, i64 0, i64 2), align 4, !dbg !42 64 call void @llvm.dbg.value(metadata i32 %1, metadata !25, metadata !DIExpression()), !dbg !36 65 %2 = load i32, ptr getelementptr inbounds ([256 x i32], ptr @array, i64 0, i64 3), align 4, !dbg !43 66 call void @llvm.dbg.value(metadata i32 %2, metadata !26, metadata !DIExpression()), !dbg !36 67 %3 = load i32, ptr getelementptr inbounds ([256 x i32], ptr @array, i64 0, i64 4), align 4, !dbg !44 68 call void @llvm.dbg.value(metadata i32 %3, metadata !27, metadata !DIExpression()), !dbg !36 69 %4 = load i32, ptr getelementptr inbounds ([256 x i32], ptr @array, i64 0, i64 5), align 4, !dbg !45 70 call void @llvm.dbg.value(metadata i32 %4, metadata !28, metadata !DIExpression()), !dbg !36 71 %5 = load i32, ptr getelementptr inbounds ([256 x i32], ptr @array, i64 0, i64 6), align 4, !dbg !46 72 call void @llvm.dbg.value(metadata i32 %5, metadata !29, metadata !DIExpression()), !dbg !36 73 %6 = load i32, ptr getelementptr inbounds ([256 x i32], ptr @array, i64 0, i64 7), align 4, !dbg !47 74 call void @llvm.dbg.value(metadata i32 %6, metadata !30, metadata !DIExpression()), !dbg !36 75 %7 = load i32, ptr getelementptr inbounds ([256 x i32], ptr @array, i64 0, i64 8), align 4, !dbg !48 76 call void @llvm.dbg.value(metadata i32 %7, metadata !31, metadata !DIExpression()), !dbg !36 77 %8 = load i32, ptr getelementptr inbounds ([256 x i32], ptr @array, i64 0, i64 9), align 4, !dbg !49 78 call void @llvm.dbg.value(metadata i32 %8, metadata !32, metadata !DIExpression()), !dbg !36 79 %9 = load i32, ptr getelementptr inbounds ([256 x i32], ptr @array, i64 0, i64 10), align 4, !dbg !50 80 call void @llvm.dbg.value(metadata i32 %9, metadata !33, metadata !DIExpression()), !dbg !36 81 call void @llvm.dbg.value(metadata i32 0, metadata !34, metadata !DIExpression()), !dbg !51 82 br label %for.body, !dbg !52 83 84for.cond.cleanup: ; preds = %for.body 85 ret i32 0, !dbg !53 86 87for.body: ; preds = %for.body, %entry 88 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] 89 call void @llvm.dbg.value(metadata i64 %indvars.iv, metadata !34, metadata !DIExpression()), !dbg !51 90 %arrayidx = getelementptr inbounds [256 x i32], ptr @array, i64 0, i64 %indvars.iv, !dbg !54 91 store i32 56, ptr %arrayidx, align 4, !dbg !57 92 %10 = trunc i64 %indvars.iv to i32, !dbg !58 93 tail call void (i32, ...) @_Z4funciz(i32 0, i32 %10, i32 %0, i32 %1, i32 %2, i32 %3, i32 %4, i32 %5, i32 %6, i32 %7, i32 %8, i32 %9), !dbg !58 94 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !59 95 call void @llvm.dbg.value(metadata i32 undef, metadata !34, metadata !DIExpression(DW_OP_plus_uconst, 1, DW_OP_stack_value)), !dbg !51 96 %exitcond = icmp eq i64 %indvars.iv.next, 256, !dbg !60 97 br i1 %exitcond, label %for.cond.cleanup, label %for.body, !dbg !52, !llvm.loop !61 98} 99 100declare dso_local void @_Z4funciz(i32, ...) local_unnamed_addr #1 101 102; Function Attrs: nounwind readnone speculatable 103declare void @llvm.dbg.value(metadata, metadata, metadata) #2 104 105attributes #0 = { nounwind uwtable } 106attributes #1 = { nounwind uwtable } 107attributes #2 = { nounwind readnone speculatable } 108 109!llvm.dbg.cu = !{!2} 110!llvm.module.flags = !{!10, !11, !12} 111!llvm.ident = !{!13} 112 113!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression()) 114!1 = distinct !DIGlobalVariable(name: "array", scope: !2, file: !3, line: 4, type: !6, isLocal: false, isDefinition: true) 115!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 9.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None) 116!3 = !DIFile(filename: "test_debug_val.cpp", directory: "") 117!4 = !{} 118!5 = !{!0} 119!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 8192, elements: !8) 120!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 121!8 = !{!9} 122!9 = !DISubrange(count: 256) 123!10 = !{i32 2, !"Dwarf Version", i32 4} 124!11 = !{i32 2, !"Debug Info Version", i32 3} 125!12 = !{i32 1, !"wchar_size", i32 4} 126!13 = !{!"clang version 9.0.0 "} 127!14 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 6, type: !15, scopeLine: 7, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !20) 128!15 = !DISubroutineType(types: !16) 129!16 = !{!7, !7, !17} 130!17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !18, size: 64) 131!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64) 132!19 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_unsigned_char) 133!20 = !{!21, !22, !23, !24, !25, !26, !27, !28, !29, !30, !31, !32, !33, !34} 134!21 = !DILocalVariable(name: "argc", arg: 1, scope: !14, file: !3, line: 6, type: !7) 135!22 = !DILocalVariable(name: "argv", arg: 2, scope: !14, file: !3, line: 6, type: !17) 136!23 = !DILocalVariable(name: "var", scope: !14, file: !3, line: 8, type: !7) 137!24 = !DILocalVariable(name: "a1", scope: !14, file: !3, line: 10, type: !7) 138!25 = !DILocalVariable(name: "a2", scope: !14, file: !3, line: 10, type: !7) 139!26 = !DILocalVariable(name: "a3", scope: !14, file: !3, line: 10, type: !7) 140!27 = !DILocalVariable(name: "a4", scope: !14, file: !3, line: 10, type: !7) 141!28 = !DILocalVariable(name: "a5", scope: !14, file: !3, line: 11, type: !7) 142!29 = !DILocalVariable(name: "a6", scope: !14, file: !3, line: 11, type: !7) 143!30 = !DILocalVariable(name: "a7", scope: !14, file: !3, line: 11, type: !7) 144!31 = !DILocalVariable(name: "a8", scope: !14, file: !3, line: 11, type: !7) 145!32 = !DILocalVariable(name: "a9", scope: !14, file: !3, line: 12, type: !7) 146!33 = !DILocalVariable(name: "a10", scope: !14, file: !3, line: 12, type: !7) 147!34 = !DILocalVariable(name: "i", scope: !35, file: !3, line: 14, type: !7) 148!35 = distinct !DILexicalBlock(scope: !14, file: !3, line: 14, column: 4) 149!36 = !DILocation(line: 0, scope: !14) 150!37 = !DILocation(line: 10, column: 13, scope: !14) 151!42 = !DILocation(line: 10, column: 32, scope: !14) 152!43 = !DILocation(line: 10, column: 51, scope: !14) 153!44 = !DILocation(line: 10, column: 70, scope: !14) 154!45 = !DILocation(line: 11, column: 13, scope: !14) 155!46 = !DILocation(line: 11, column: 32, scope: !14) 156!47 = !DILocation(line: 11, column: 51, scope: !14) 157!48 = !DILocation(line: 11, column: 70, scope: !14) 158!49 = !DILocation(line: 12, column: 13, scope: !14) 159!50 = !DILocation(line: 12, column: 33, scope: !14) 160!51 = !DILocation(line: 0, scope: !35) 161!52 = !DILocation(line: 14, column: 4, scope: !35) 162!53 = !DILocation(line: 21, column: 4, scope: !14) 163!54 = !DILocation(line: 16, column: 8, scope: !55) 164!55 = distinct !DILexicalBlock(scope: !56, file: !3, line: 14, column: 37) 165!56 = distinct !DILexicalBlock(scope: !35, file: !3, line: 14, column: 4) 166!57 = !DILocation(line: 16, column: 17, scope: !55) 167!58 = !DILocation(line: 18, column: 8, scope: !55) 168!59 = !DILocation(line: 14, column: 32, scope: !56) 169!60 = !DILocation(line: 14, column: 22, scope: !56) 170!61 = distinct !{!61, !52, !62} 171!62 = !DILocation(line: 19, column: 4, scope: !35) 172