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[codeview] Workaround for PR43479, don't re-emit instr labels

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Summary:
In the long run we should come up with another mechanism for marking
call instructions as heap allocation sites, and remove this workaround.
For now, we've had two bug reports about this, so let's apply this
workaround. SLH (the other client of instruction labels) probably has
the same bug, but the solution there is more likely to be to mark the
call instruction as not duplicatable, which doesn't work for debug info.

Reviewers: akhuang

Subscribers: aprantl, hiraditya, aganea, chandlerc, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D69068

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375137 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner
2019-10-17 17:28:31 +00:00
parent 5600873160
commit c21ecb75c2
2 changed files with 93 additions and 4 deletions
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test/CodeGen/X86/taildup-heapallocsite.ll
+81
View File
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; 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)