xref: /llvm-project/llvm/test/DebugInfo/Generic/assignment-tracking/mem2reg/phi.ll (revision 094572701dce4aaf36f4521d6cf750420d39f206)

; RUN: opt -passes=mem2reg -S %s -o - \
; RUN: | FileCheck %s --implicit-check-not="call void @llvm.dbg"
; RUN: opt --try-experimental-debuginfo-iterators -passes=mem2reg -S %s -o - \
; RUN: | FileCheck %s --implicit-check-not="call void @llvm.dbg"

;; Test assignment tracking debug info when mem2reg promotes an alloca with
;; stores requiring insertion of a phi. Check the output when the stores are
;; tagged and also untagged (test manually updated for the latter by linking a
;; dbg.assgin for another variable "b" to the alloca).

; CHECK: entry:
; CHECK-NEXT: #dbg_value(i32 %a, ![[B:[0-9]+]]
; CHECK-NEXT: #dbg_value(i32 %a, ![[A:[0-9]+]]
; CHECK: if.then:
; CHECK-NEXT: %add =
; CHECK-NEXT: #dbg_value(i32 %add, ![[B]]
; CHECK-NEXT: #dbg_value(i32 %add, ![[A]]
; CHECK: if.else:
; CHECK-NEXT: #dbg_value(i32 -1, ![[B]]
; CHECK-NEXT: #dbg_value(i32 -1, ![[A]]
; CHECK: if.end:
; CHECK-NEXT: %a.addr.0 = phi i32
; CHECK-NEXT: #dbg_value(i32 %a.addr.0, ![[A]]
; CHECK-NEXT: #dbg_value(i32 %a.addr.0, ![[B]]

; CHECK-DAG: ![[A]] = !DILocalVariable(name: "a",
; CHECK-DAG: ![[B]] = !DILocalVariable(name: "b",

;; $ cat test.cpp
;; int f(int a) {
;;   if (a)
;;     a += 1;
;;   else
;;     a = -1;
;;   return a;
;; }

define dso_local noundef i32 @_Z1fi(i32 noundef %a) #0 !dbg !7 {
entry:
  %a.addr = alloca i32, align 4, !DIAssignID !13
  call void @llvm.dbg.assign(metadata i1 undef, metadata !12, metadata !DIExpression(), metadata !13, metadata ptr %a.addr, metadata !DIExpression()), !dbg !14
  call void @llvm.dbg.assign(metadata i1 undef, metadata !30, metadata !DIExpression(), metadata !13, metadata ptr %a.addr, metadata !DIExpression()), !dbg !14
  store i32 %a, ptr %a.addr, align 4, !DIAssignID !19
  call void @llvm.dbg.assign(metadata i32 %a, metadata !12, metadata !DIExpression(), metadata !19, metadata ptr %a.addr, metadata !DIExpression()), !dbg !14
  %0 = load i32, ptr %a.addr, align 4, !dbg !20
  %tobool = icmp ne i32 %0, 0, !dbg !20
  br i1 %tobool, label %if.then, label %if.else, !dbg !22

if.then:                                          ; preds = %entry
  %1 = load i32, ptr %a.addr, align 4, !dbg !23
  %add = add nsw i32 %1, 1, !dbg !23
  store i32 %add, ptr %a.addr, align 4, !dbg !23, !DIAssignID !24
  call void @llvm.dbg.assign(metadata i32 %add, metadata !12, metadata !DIExpression(), metadata !24, metadata ptr %a.addr, metadata !DIExpression()), !dbg !14
  br label %if.end, !dbg !25

if.else:                                          ; preds = %entry
  store i32 -1, ptr %a.addr, align 4, !dbg !26, !DIAssignID !27
  call void @llvm.dbg.assign(metadata i32 -1, metadata !12, metadata !DIExpression(), metadata !27, metadata ptr %a.addr, metadata !DIExpression()), !dbg !14
  br label %if.end

if.end:                                           ; preds = %if.else, %if.then
  %2 = load i32, ptr %a.addr, align 4, !dbg !28
  ret i32 %2, !dbg !29
}

declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata)

!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!2, !3, !4, !5, !1000}
!llvm.ident = !{!6}

!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 14.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
!1 = !DIFile(filename: "test.cpp", directory: "/")
!2 = !{i32 7, !"Dwarf Version", i32 5}
!3 = !{i32 2, !"Debug Info Version", i32 3}
!4 = !{i32 1, !"wchar_size", i32 4}
!5 = !{i32 7, !"uwtable", i32 1}
!6 = !{!"clang version 14.0.0"}
!7 = distinct !DISubprogram(name: "f", linkageName: "_Z1fi", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
!8 = !DISubroutineType(types: !9)
!9 = !{!10, !10}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !{!12}
!12 = !DILocalVariable(name: "a", arg: 1, scope: !7, file: !1, line: 1, type: !10)
!13 = distinct !DIAssignID()
!14 = !DILocation(line: 0, scope: !7)
!19 = distinct !DIAssignID()
!20 = !DILocation(line: 2, column: 7, scope: !21)
!21 = distinct !DILexicalBlock(scope: !7, file: !1, line: 2, column: 7)
!22 = !DILocation(line: 2, column: 7, scope: !7)
!23 = !DILocation(line: 3, column: 7, scope: !21)
!24 = distinct !DIAssignID()
!25 = !DILocation(line: 3, column: 5, scope: !21)
!26 = !DILocation(line: 5, column: 7, scope: !21)
!27 = distinct !DIAssignID()
!28 = !DILocation(line: 6, column: 10, scope: !7)
!29 = !DILocation(line: 6, column: 3, scope: !7)
!30 = !DILocalVariable(name: "b", arg: 2, scope: !7, file: !1, line: 1, type: !10)
!1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true}