; LLVM IR from Dev-XYS/Algorithms :: Prüfer-Sequence(Tree-to-Sequence).ll (Z3dfsii)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%struct.vertex = type { i32, i32, i32, i8 }
%struct.edge = type { i32, i32 }

@V = external dso_local global [100010 x %struct.vertex], align 16
@E = external dso_local global [200010 x %struct.edge], align 16

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3dfsii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %7
  %9 = getelementptr inbounds %struct.vertex, ptr %8, i32 0, i32 3
  store i8 1, ptr %9, align 4, !tbaa !9
  %10 = load i32, ptr %4, align 4, !tbaa !5
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %12
  %14 = getelementptr inbounds %struct.vertex, ptr %13, i32 0, i32 2
  store i32 %10, ptr %14, align 8, !tbaa !12
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %16
  %18 = getelementptr inbounds %struct.vertex, ptr %17, i32 0, i32 0
  %19 = load i32, ptr %18, align 16, !tbaa !13
  store i32 %19, ptr %5, align 4, !tbaa !5
  br label %20

20:                                               ; preds = %51, %2
  %21 = load i32, ptr %5, align 4, !tbaa !5
  %22 = icmp ne i32 %21, 0
  br i1 %22, label %24, label %23

23:                                               ; preds = %20
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %57

24:                                               ; preds = %20
  %25 = load i32, ptr %5, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [200010 x %struct.edge], ptr @E, i64 0, i64 %26
  %28 = getelementptr inbounds %struct.edge, ptr %27, i32 0, i32 0
  %29 = load i32, ptr %28, align 8, !tbaa !14
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %30
  %32 = getelementptr inbounds %struct.vertex, ptr %31, i32 0, i32 3
  %33 = load i8, ptr %32, align 4, !tbaa !9, !range !16, !noundef !17
  %34 = trunc i8 %33 to i1
  %35 = zext i1 %34 to i32
  %36 = icmp eq i32 %35, 0
  br i1 %36, label %37, label %50

37:                                               ; preds = %24
  %38 = load i32, ptr %5, align 4, !tbaa !5
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds [200010 x %struct.edge], ptr @E, i64 0, i64 %39
  %41 = getelementptr inbounds %struct.edge, ptr %40, i32 0, i32 0
  %42 = load i32, ptr %41, align 8, !tbaa !14
  %43 = load i32, ptr %3, align 4, !tbaa !5
  call void @_Z3dfsii(i32 noundef %42, i32 noundef %43)
  %44 = load i32, ptr %3, align 4, !tbaa !5
  %45 = sext i32 %44 to i64
  %46 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %45
  %47 = getelementptr inbounds %struct.vertex, ptr %46, i32 0, i32 1
  %48 = load i32, ptr %47, align 4, !tbaa !18
  %49 = add nsw i32 %48, 1
  store i32 %49, ptr %47, align 4, !tbaa !18
  br label %50

50:                                               ; preds = %37, %24
  br label %51

51:                                               ; preds = %50
  %52 = load i32, ptr %5, align 4, !tbaa !5
  %53 = sext i32 %52 to i64
  %54 = getelementptr inbounds [200010 x %struct.edge], ptr @E, i64 0, i64 %53
  %55 = getelementptr inbounds %struct.edge, ptr %54, i32 0, i32 1
  %56 = load i32, ptr %55, align 4, !tbaa !19
  store i32 %56, ptr %5, align 4, !tbaa !5
  br label %20, !llvm.loop !20

57:                                               ; preds = %23
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !11, i64 12}
!10 = !{!"_ZTS6vertex", !6, i64 0, !6, i64 4, !6, i64 8, !11, i64 12}
!11 = !{!"bool", !7, i64 0}
!12 = !{!10, !6, i64 8}
!13 = !{!10, !6, i64 0}
!14 = !{!15, !6, i64 0}
!15 = !{!"_ZTS4edge", !6, i64 0, !6, i64 4}
!16 = !{i8 0, i8 2}
!17 = !{}
!18 = !{!10, !6, i64 4}
!19 = !{!15, !6, i64 4}
!20 = distinct !{!20, !21}
!21 = !{!"llvm.loop.mustprogress"}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%struct.vertex = type { i32, i32, i32, i8 }
%struct.edge = type { i32, i32 }

@V = external dso_local local_unnamed_addr global [100010 x %struct.vertex], align 16
@E = external dso_local local_unnamed_addr global [200010 x %struct.edge], align 16

; Function Attrs: mustprogress nofree nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z3dfsii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = sext i32 %0 to i64
  %4 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %3
  %5 = getelementptr inbounds i8, ptr %4, i64 12
  store i8 1, ptr %5, align 4, !tbaa !5
  %6 = getelementptr inbounds i8, ptr %4, i64 8
  store i32 %1, ptr %6, align 8, !tbaa !11
  %.010 = load i32, ptr %4, align 16, !tbaa !12
  %.not11 = icmp eq i32 %.010, 0
  br i1 %.not11, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2
  %7 = getelementptr inbounds i8, ptr %4, i64 4
  br label %8

._crit_edge:                                      ; preds = %19, %2
  ret void

8:                                                ; preds = %.lr.ph, %19
  %.012 = phi i32 [ %.010, %.lr.ph ], [ %.0, %19 ]
  %9 = sext i32 %.012 to i64
  %10 = getelementptr inbounds [200010 x %struct.edge], ptr @E, i64 0, i64 %9
  %11 = load i32, ptr %10, align 8, !tbaa !13
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %12, i32 3
  %14 = load i8, ptr %13, align 4, !tbaa !5, !range !15, !noundef !16
  %15 = icmp eq i8 %14, 0
  br i1 %15, label %16, label %19

16:                                               ; preds = %8
  tail call void @_Z3dfsii(i32 noundef %11, i32 noundef %0)
  %17 = load i32, ptr %7, align 4, !tbaa !17
  %18 = add nsw i32 %17, 1
  store i32 %18, ptr %7, align 4, !tbaa !17
  br label %19

19:                                               ; preds = %8, %16
  %20 = getelementptr inbounds i8, ptr %10, i64 4
  %.0 = load i32, ptr %20, align 4, !tbaa !12
  %.not = icmp eq i32 %.0, 0
  br i1 %.not, label %._crit_edge, label %8, !llvm.loop !18
}

attributes #0 = { mustprogress nofree nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !10, i64 12}
!6 = !{!"_ZTS6vertex", !7, i64 0, !7, i64 4, !7, i64 8, !10, i64 12}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"bool", !8, i64 0}
!11 = !{!6, !7, i64 8}
!12 = !{!7, !7, i64 0}
!13 = !{!14, !7, i64 0}
!14 = !{!"_ZTS4edge", !7, i64 0, !7, i64 4}
!15 = !{i8 0, i8 2}
!16 = !{}
!17 = !{!6, !7, i64 4}
!18 = distinct !{!18, !19}
!19 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass