1 ; RUN: llc < %s -tail-dup-placement-threshold=4 | FileCheck %s
3 ; Based on test case from PR43695:
4 ; __declspec(allocator) void *alloc(unsigned int size);
6 ; void f1(unsigned int *size_ptr) {
7 ; void *hg = alloc(size_ptr ? *size_ptr : 1UL);
11 ; In this case, block placement duplicates the heap allocation site. For now,
12 ; LLVM drops the labels from one call site. Eventually, we should track both.
15 source_filename = "t.cpp"
16 target datalayout = "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
17 target triple = "x86_64-pc-windows-msvc19.22.27905"
19 define dso_local void @taildupit(i32* readonly %size_ptr) !dbg !8 {
21 call void @llvm.dbg.value(metadata i32* %size_ptr, metadata !14, metadata !DIExpression()), !dbg !17
22 %tobool = icmp eq i32* %size_ptr, null, !dbg !18
23 br i1 %tobool, label %cond.end, label %cond.true, !dbg !18
25 cond.true: ; preds = %entry
26 %0 = load i32, i32* %size_ptr, align 4, !dbg !18, !tbaa !19
27 br label %cond.end, !dbg !18
29 cond.end: ; preds = %entry, %cond.true
30 %cond = phi i32 [ %0, %cond.true ], [ 1, %entry ], !dbg !18
31 %call = tail call i8* @alloc(i32 %cond), !dbg !18, !heapallocsite !2
32 call void @llvm.dbg.value(metadata i8* %call, metadata !15, metadata !DIExpression()), !dbg !17
33 tail call void @f2(), !dbg !23
37 ; CHECK-LABEL: taildupit: # @taildupit
40 ; CHECK: .Lheapallocsite0:
42 ; CHECK: .Lheapallocsite1:
43 ; CHECK: jmp f2 # TAILCALL
44 ; CHECK-NOT: Lheapallocsite
46 ; CHECK-NOT: Lheapallocsite
47 ; CHECK: jmp f2 # TAILCALL
49 declare dso_local i8* @alloc(i32)
51 declare dso_local void @f2()
53 declare void @llvm.dbg.value(metadata, metadata, metadata)
56 !llvm.module.flags = !{!3, !4, !5, !6}
58 !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)
59 !1 = !DIFile(filename: "t.cpp", directory: "C:\\src\\llvm-project\\build", checksumkind: CSK_MD5, checksum: "b227901e92d848fa564190b0762d757c")
61 !3 = !{i32 2, !"CodeView", i32 1}
62 !4 = !{i32 2, !"Debug Info Version", i32 3}
63 !5 = !{i32 1, !"wchar_size", i32 2}
64 !6 = !{i32 7, !"PIC Level", i32 2}
65 !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)
66 !9 = !DISubroutineType(types: !10)
68 !11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
69 !12 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
71 !14 = !DILocalVariable(name: "size_ptr", arg: 1, scope: !8, file: !1, line: 5, type: !11)
72 !15 = !DILocalVariable(name: "hg", scope: !8, file: !1, line: 6, type: !16)
73 !16 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
74 !17 = !DILocation(line: 0, scope: !8)
75 !18 = !DILocation(line: 6, scope: !8)
76 !19 = !{!20, !20, i64 0}
77 !20 = !{!"int", !21, i64 0}
78 !21 = !{!"omnipotent char", !22, i64 0}
79 !22 = !{!"Simple C++ TBAA"}
80 !23 = !DILocation(line: 7, scope: !8)
81 !24 = !DILocation(line: 8, scope: !8)