diff options
Diffstat (limited to 'llvm/test/CodeGen/X86/taildup-heapallocsite.ll')
| -rw-r--r-- | llvm/test/CodeGen/X86/taildup-heapallocsite.ll | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/X86/taildup-heapallocsite.ll b/llvm/test/CodeGen/X86/taildup-heapallocsite.ll new file mode 100644 index 00000000000..378efe2deec --- /dev/null +++ b/llvm/test/CodeGen/X86/taildup-heapallocsite.ll @@ -0,0 +1,81 @@ +; RUN: llc < %s -tail-dup-placement-threshold=4 | FileCheck %s + +; Based on test case from PR43695: +; __declspec(allocator) void *alloc(unsigned int size); +; void f2(); +; void f1(unsigned int *size_ptr) { +; void *hg = alloc(size_ptr ? *size_ptr : 1UL); +; f2(); +; } + +; In this case, block placement duplicates the heap allocation site. For now, +; LLVM drops the labels from one call site. Eventually, we should track both. + +; ModuleID = 't.cpp' +source_filename = "t.cpp" +target datalayout = "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-pc-windows-msvc19.22.27905" + +define dso_local void @taildupit(i32* readonly %size_ptr) !dbg !8 { +entry: + call void @llvm.dbg.value(metadata i32* %size_ptr, metadata !14, metadata !DIExpression()), !dbg !17 + %tobool = icmp eq i32* %size_ptr, null, !dbg !18 + br i1 %tobool, label %cond.end, label %cond.true, !dbg !18 + +cond.true: ; preds = %entry + %0 = load i32, i32* %size_ptr, align 4, !dbg !18, !tbaa !19 + br label %cond.end, !dbg !18 + +cond.end: ; preds = %entry, %cond.true + %cond = phi i32 [ %0, %cond.true ], [ 1, %entry ], !dbg !18 + %call = tail call i8* @alloc(i32 %cond), !dbg !18, !heapallocsite !2 + call void @llvm.dbg.value(metadata i8* %call, metadata !15, metadata !DIExpression()), !dbg !17 + tail call void @f2(), !dbg !23 + ret void, !dbg !24 +} + +; CHECK-LABEL: taildupit: # @taildupit +; CHECK: testq +; CHECK: je +; CHECK: .Lheapallocsite0: +; CHECK: callq alloc +; CHECK: .Lheapallocsite1: +; CHECK: jmp f2 # TAILCALL +; CHECK-NOT: Lheapallocsite +; CHECK: callq alloc +; CHECK-NOT: Lheapallocsite +; CHECK: jmp f2 # TAILCALL + +declare dso_local i8* @alloc(i32) + +declare dso_local void @f2() + +declare void @llvm.dbg.value(metadata, metadata, metadata) + +!llvm.dbg.cu = !{!0} +!llvm.module.flags = !{!3, !4, !5, !6} + +!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) +!1 = !DIFile(filename: "t.cpp", directory: "C:\\src\\llvm-project\\build", checksumkind: CSK_MD5, checksum: "b227901e92d848fa564190b0762d757c") +!2 = !{} +!3 = !{i32 2, !"CodeView", i32 1} +!4 = !{i32 2, !"Debug Info Version", i32 3} +!5 = !{i32 1, !"wchar_size", i32 2} +!6 = !{i32 7, !"PIC Level", i32 2} +!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) +!9 = !DISubroutineType(types: !10) +!10 = !{null, !11} +!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64) +!12 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned) +!13 = !{!14, !15} +!14 = !DILocalVariable(name: "size_ptr", arg: 1, scope: !8, file: !1, line: 5, type: !11) +!15 = !DILocalVariable(name: "hg", scope: !8, file: !1, line: 6, type: !16) +!16 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64) +!17 = !DILocation(line: 0, scope: !8) +!18 = !DILocation(line: 6, scope: !8) +!19 = !{!20, !20, i64 0} +!20 = !{!"int", !21, i64 0} +!21 = !{!"omnipotent char", !22, i64 0} +!22 = !{!"Simple C++ TBAA"} +!23 = !DILocation(line: 7, scope: !8) +!24 = !DILocation(line: 8, scope: !8) |
