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1; RUN: llc < %s | FileCheck %s2 3; Reduced manually from C source:4; unsigned __attribute__((noinline, optnone)) useslot(unsigned v) { return v; }5; void __attribute__((noinline)) f(unsigned cell_offset, unsigned *page_start_) {6; unsigned cell = page_start_[0];7; while (cell) {8; unsigned bit_offset = cell_offset ? __builtin_ctz(cell) : 32;9; unsigned bit_mask = 1U << bit_offset;10; unsigned slot = (cell_offset + bit_offset) << /*log2(sizeof(ptr))*/ 3;11; cell ^= bit_mask + page_start_[slot];12; }13; }14; int main() {15; static unsigned pages[32] = {1, 2, 3, 4, 5, 6, 7};16; f(3, &pages[0]);17; }18 19; We had a bug where the DBG_VALUE instruction for bit_offset would be emitted20; at the end of the basic block, long after its actual program point. What's21; interesting in this example is that the !range metadata produces an AssertSext22; DAG node that gets replaced during ISel. This leads to an unordered SDDbgValue23; vector, which has to be sorted by IR order before it is processed in parallel24; with the Orders insertion point vector.25 26; CHECK-LABEL: f: # @f27; CHECK: .LBB0_4:28; Check that this DEBUG_VALUE comes before the left shift.29; CHECK: #DEBUG_VALUE: bit_offset <- $ecx30; CHECK: .cv_loc 0 1 8 28 # t.c:8:2831; CHECK: movl $1, %[[reg:[^ ]*]]32; CHECK: shll %cl, %[[reg]]33; CHECK: .LBB0_2: # %while.body34; CHECK: movl $32, %ecx35; CHECK: testl {{.*}}36; CHECK: jne .LBB0_437; CHECK: # %bb.3: # %if.then38; CHECK: callq if_then39; CHECK: movl %eax, %ecx40; CHECK: jmp .LBB0_441 42; ModuleID = 't.c'43source_filename = "t.c"44target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"45target triple = "x86_64-pc-windows-msvc19.0.24215"46 47; Function Attrs: nounwind readnone speculatable48declare void @llvm.dbg.declare(metadata, metadata, metadata) #149 50declare i32 @if_then()51 52; Function Attrs: noinline nounwind readonly uwtable53define void @f(i32 %cell_offset, ptr nocapture %page_start_) local_unnamed_addr #0 !dbg !31 {54entry:55 %0 = load i32, ptr %page_start_, align 4, !dbg !4556 %tobool14 = icmp eq i32 %0, 0, !dbg !4757 br i1 %tobool14, label %while.end, label %while.body, !dbg !4758 59while.body: ; preds = %while.body.lr.ph, %while.body60 %cell.015 = phi i32 [ %0, %entry ], [ %xor, %if.end ]61 %tobool1 = icmp eq i32 %cell_offset, 062 br i1 %tobool1, label %if.then, label %if.end63 64if.then:65 %1 = call i32 @if_then(), !dbg !48, !range !4966 br label %if.end67 68if.end:69 %cond = phi i32 [ %1, %if.then ], [ 32, %while.body ]70 tail call void @llvm.dbg.value(metadata i32 %cond, metadata !39, metadata !DIExpression()), !dbg !5171 %shl = shl i32 1, %cond, !dbg !5272 %add = add i32 %cond, %cell_offset, !dbg !5473 %shl2 = shl i32 %add, 3, !dbg !5574 %idxprom = zext i32 %shl2 to i64, !dbg !5775 %arrayidx3 = getelementptr inbounds i32, ptr %page_start_, i64 %idxprom, !dbg !5776 %2 = load i32, ptr %arrayidx3, align 4, !dbg !5777 %add4 = add i32 %2, %shl, !dbg !5878 %xor = xor i32 %add4, %cell.015, !dbg !5979 tail call void @llvm.dbg.value(metadata i32 %xor, metadata !38, metadata !DIExpression()), !dbg !4680 %tobool = icmp eq i32 %xor, 0, !dbg !4781 br i1 %tobool, label %while.end, label %while.body, !dbg !47, !llvm.loop !6082 83while.end: ; preds = %while.body, %entry84 ret void, !dbg !6285}86 87; Function Attrs: nounwind readnone speculatable88declare i32 @llvm.cttz.i32(i32, i1) #189 90; Function Attrs: nounwind readnone speculatable91declare void @llvm.dbg.value(metadata, metadata, metadata) #192 93attributes #0 = { noinline nounwind readonly uwtable }94attributes #1 = { nounwind readnone speculatable }95 96!llvm.dbg.cu = !{!0}97!llvm.module.flags = !{!14, !15, !16, !17}98!llvm.ident = !{!18}99 100!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !3)101!1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild", checksumkind: CSK_MD5, checksum: "f80d0003faf76554dfdec6c95da285cc")102!2 = !{}103!3 = !{!4}104!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())105!5 = distinct !DIGlobalVariable(name: "pages", scope: !6, file: !1, line: 18, type: !10, isLocal: true, isDefinition: true)106!6 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 17, type: !7, isLocal: false, isDefinition: true, scopeLine: 17, isOptimized: true, unit: !0, retainedNodes: !2)107!7 = !DISubroutineType(types: !8)108!8 = !{!9}109!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)110!10 = !DICompositeType(tag: DW_TAG_array_type, baseType: !11, size: 1024, elements: !12)111!11 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)112!12 = !{!13}113!13 = !DISubrange(count: 32)114!14 = !{i32 2, !"CodeView", i32 1}115!15 = !{i32 2, !"Debug Info Version", i32 3}116!16 = !{i32 1, !"wchar_size", i32 2}117!17 = !{i32 7, !"PIC Level", i32 2}118!18 = !{!"clang version 6.0.0 "}119!31 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 4, type: !32, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !35)120!32 = !DISubroutineType(types: !33)121!33 = !{null, !11, !34}122!34 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64)123!35 = !{!36, !37, !38, !39, !41, !42}124!36 = !DILocalVariable(name: "page_start_", arg: 2, scope: !31, file: !1, line: 4, type: !34)125!37 = !DILocalVariable(name: "cell_offset", arg: 1, scope: !31, file: !1, line: 4, type: !11)126!38 = !DILocalVariable(name: "cell", scope: !31, file: !1, line: 5, type: !11)127!39 = !DILocalVariable(name: "bit_offset", scope: !40, file: !1, line: 7, type: !11)128!40 = distinct !DILexicalBlock(scope: !31, file: !1, line: 6, column: 16)129!41 = !DILocalVariable(name: "bit_mask", scope: !40, file: !1, line: 8, type: !11)130!42 = !DILocalVariable(name: "slot", scope: !40, file: !1, line: 9, type: !11)131!43 = !DILocation(line: 4, column: 66, scope: !31)132!44 = !DILocation(line: 4, column: 43, scope: !31)133!45 = !DILocation(line: 5, column: 19, scope: !31)134!46 = !DILocation(line: 5, column: 12, scope: !31)135!47 = !DILocation(line: 6, column: 3, scope: !31)136!48 = !DILocation(line: 7, column: 41, scope: !40)137!49 = !{i32 0, i32 33}138!50 = !DILocation(line: 7, column: 27, scope: !40)139!51 = !DILocation(line: 7, column: 14, scope: !40)140!52 = !DILocation(line: 8, column: 28, scope: !40)141!53 = !DILocation(line: 8, column: 14, scope: !40)142!54 = !DILocation(line: 9, column: 34, scope: !40)143!55 = !DILocation(line: 9, column: 48, scope: !40)144!56 = !DILocation(line: 9, column: 14, scope: !40)145!57 = !DILocation(line: 13, column: 24, scope: !40)146!58 = !DILocation(line: 13, column: 22, scope: !40)147!59 = !DILocation(line: 13, column: 10, scope: !40)148!60 = distinct !{!60, !47, !61}149!61 = !DILocation(line: 14, column: 3, scope: !31)150!62 = !DILocation(line: 15, column: 1, scope: !31)151