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1; RUN: llc < %s -tail-dup-placement-threshold=4 | FileCheck %s2 3; Based on test case from PR43695:4; __declspec(allocator) ptr alloc(unsigned int size);5; void f2();6; void f1(unsigned int *size_ptr) {7; ptr hg = alloc(size_ptr ? *size_ptr : 1UL);8; f2();9; }10 11; In this case, block placement duplicates the heap allocation site.12 13; ModuleID = 't.cpp'14source_filename = "t.cpp"15target datalayout = "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"16target triple = "x86_64-pc-windows-msvc19.22.27905"17 18define dso_local void @taildupit(ptr readonly %size_ptr) !dbg !8 {19entry:20 call void @llvm.dbg.value(metadata ptr %size_ptr, metadata !14, metadata !DIExpression()), !dbg !1721 %tobool = icmp eq ptr %size_ptr, null, !dbg !1822 br i1 %tobool, label %cond.end, label %cond.true, !dbg !1823 24cond.true: ; preds = %entry25 %0 = load i32, ptr %size_ptr, align 4, !dbg !18, !tbaa !1926 br label %cond.end, !dbg !1827 28cond.end: ; preds = %entry, %cond.true29 %cond = phi i32 [ %0, %cond.true ], [ 1, %entry ], !dbg !1830 %call = tail call ptr @alloc(i32 %cond), !dbg !18, !heapallocsite !231 call void @llvm.dbg.value(metadata ptr %call, metadata !15, metadata !DIExpression()), !dbg !1732 tail call void @f2(), !dbg !2333 ret void, !dbg !2434}35 36; CHECK-LABEL: taildupit: # @taildupit37; CHECK: testq38; CHECK: je39; CHECK: callq alloc40; CHECK-NEXT: nop41; CHECK-NEXT: [[L1:.Ltmp[0-9]+]]42; CHECK: jmp f2 # TAILCALL43; CHECK: callq alloc44; CHECK-NEXT: nop45; CHECK-NEXT: [[L3:.Ltmp[0-9]+]]46; CHECK: jmp f2 # TAILCALL47 48; CHECK-LABEL: .short 4423 # Record kind: S_GPROC32_ID49; CHECK: .short 4446 # Record kind: S_HEAPALLOCSITE50; CHECK-NEXT: .secrel32 [[L0:.Ltmp[0-9]+]]51; CHECK-NEXT: .secidx [[L0]]52; CHECK-NEXT: .short [[L1]]-[[L0]]53; CHECK-NEXT: .long 354; CHECK: .short 4446 # Record kind: S_HEAPALLOCSITE55; CHECK-NEXT: .secrel32 [[L2:.Ltmp[0-9]+]]56; CHECK-NEXT: .secidx [[L2]]57; CHECK-NEXT: .short [[L3]]-[[L2]]58; CHECK-NEXT: .long 359 60declare dso_local ptr @alloc(i32)61 62declare dso_local void @f2()63 64declare void @llvm.dbg.value(metadata, metadata, metadata)65 66!llvm.dbg.cu = !{!0}67!llvm.module.flags = !{!3, !4, !5, !6}68 69!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 10.0.0 (git@github.com:llvm/llvm-project.git 0650355c09ab8e6605ae37b818270a7a7c8ce2c7)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)70!1 = !DIFile(filename: "t.cpp", directory: "C:\\src\\llvm-project\\build", checksumkind: CSK_MD5, checksum: "b227901e92d848fa564190b0762d757c")71!2 = !{}72!3 = !{i32 2, !"CodeView", i32 1}73!4 = !{i32 2, !"Debug Info Version", i32 3}74!5 = !{i32 1, !"wchar_size", i32 2}75!6 = !{i32 7, !"PIC Level", i32 2}76!8 = distinct !DISubprogram(name: "f1", linkageName: "?f1@@YAXPEAI@Z", scope: !1, file: !1, line: 5, type: !9, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !13)77!9 = !DISubroutineType(types: !10)78!10 = !{null, !11}79!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)80!12 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)81!13 = !{!14, !15}82!14 = !DILocalVariable(name: "size_ptr", arg: 1, scope: !8, file: !1, line: 5, type: !11)83!15 = !DILocalVariable(name: "hg", scope: !8, file: !1, line: 6, type: !16)84!16 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)85!17 = !DILocation(line: 0, scope: !8)86!18 = !DILocation(line: 6, scope: !8)87!19 = !{!20, !20, i64 0}88!20 = !{!"int", !21, i64 0}89!21 = !{!"omnipotent char", !22, i64 0}90!22 = !{!"Simple C++ TBAA"}91!23 = !DILocation(line: 7, scope: !8)92!24 = !DILocation(line: 8, scope: !8)93