; LLVM IR from lzyrapx/Competitive-Programming :: HDUOJ/5452（在线LCA）.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.edge = type { i32, i32, i32 }

@vis = external dso_local global [26 x i8], align 16
@e = external dso_local global [160014 x %struct.edge], align 16
@tot = external dso_local global i32, align 4
@head = external dso_local global [80007 x i32], align 16
@ver = external dso_local global [160014 x i32], align 16
@R = external dso_local global [160014 x i32], align 16
@first = external dso_local global [80007 x i32], align 16

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3dfsii(i32 noundef %0, i32 noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds [26 x i8], ptr @vis, i64 0, i64 %8
  store i8 1, ptr %9, align 1, !tbaa !9
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = load i32, ptr @tot, align 4, !tbaa !5
  %12 = add nsw i32 %11, 1
  store i32 %12, ptr @tot, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [160014 x i32], ptr @ver, i64 0, i64 %13
  store i32 %10, ptr %14, align 4, !tbaa !5
  %15 = load i32, ptr @tot, align 4, !tbaa !5
  %16 = load i32, ptr %3, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [80007 x i32], ptr @first, i64 0, i64 %17
  store i32 %15, ptr %18, align 4, !tbaa !5
  %19 = load i32, ptr %4, align 4, !tbaa !5
  %20 = load i32, ptr @tot, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds [160014 x i32], ptr @R, i64 0, i64 %21
  store i32 %19, ptr %22, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %23 = load i32, ptr %3, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [80007 x i32], ptr @head, i64 0, i64 %24
  %26 = load i32, ptr %25, align 4, !tbaa !5
  store i32 %26, ptr %5, align 4, !tbaa !5
  br label %27

27:                                               ; preds = %60, %2
  %28 = load i32, ptr %5, align 4, !tbaa !5
  %29 = icmp ne i32 %28, -1
  br i1 %29, label %31, label %30

30:                                               ; preds = %27
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %66

31:                                               ; preds = %27
  %32 = load i32, ptr %5, align 4, !tbaa !5
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds [160014 x %struct.edge], ptr @e, i64 0, i64 %33
  %35 = getelementptr inbounds %struct.edge, ptr %34, i32 0, i32 1
  %36 = load i32, ptr %35, align 4, !tbaa !11
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds [26 x i8], ptr @vis, i64 0, i64 %37
  %39 = load i8, ptr %38, align 1, !tbaa !9, !range !13, !noundef !14
  %40 = trunc i8 %39 to i1
  br i1 %40, label %59, label %41

41:                                               ; preds = %31
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %42 = load i32, ptr %5, align 4, !tbaa !5
  %43 = sext i32 %42 to i64
  %44 = getelementptr inbounds [160014 x %struct.edge], ptr @e, i64 0, i64 %43
  %45 = getelementptr inbounds %struct.edge, ptr %44, i32 0, i32 1
  %46 = load i32, ptr %45, align 4, !tbaa !11
  store i32 %46, ptr %6, align 4, !tbaa !5
  %47 = load i32, ptr %6, align 4, !tbaa !5
  %48 = load i32, ptr %4, align 4, !tbaa !5
  %49 = add nsw i32 %48, 1
  call void @_Z3dfsii(i32 noundef %47, i32 noundef %49)
  %50 = load i32, ptr %3, align 4, !tbaa !5
  %51 = load i32, ptr @tot, align 4, !tbaa !5
  %52 = add nsw i32 %51, 1
  store i32 %52, ptr @tot, align 4, !tbaa !5
  %53 = sext i32 %52 to i64
  %54 = getelementptr inbounds [160014 x i32], ptr @ver, i64 0, i64 %53
  store i32 %50, ptr %54, align 4, !tbaa !5
  %55 = load i32, ptr %4, align 4, !tbaa !5
  %56 = load i32, ptr @tot, align 4, !tbaa !5
  %57 = sext i32 %56 to i64
  %58 = getelementptr inbounds [160014 x i32], ptr @R, i64 0, i64 %57
  store i32 %55, ptr %58, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %59

59:                                               ; preds = %41, %31
  br label %60

60:                                               ; preds = %59
  %61 = load i32, ptr %5, align 4, !tbaa !5
  %62 = sext i32 %61 to i64
  %63 = getelementptr inbounds [160014 x %struct.edge], ptr @e, i64 0, i64 %62
  %64 = getelementptr inbounds %struct.edge, ptr %63, i32 0, i32 2
  %65 = load i32, ptr %64, align 4, !tbaa !15
  store i32 %65, ptr %5, align 4, !tbaa !5
  br label %27, !llvm.loop !16

66:                                               ; preds = %30
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = !{!12, !6, i64 4}
!12 = !{!"_ZTS4edge", !6, i64 0, !6, i64 4, !6, i64 8}
!13 = !{i8 0, i8 2}
!14 = !{}
!15 = !{!12, !6, i64 8}
!16 = distinct !{!16, !17}
!17 = !{!"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.edge = type { i32, i32, i32 }

@vis = external dso_local local_unnamed_addr global [26 x i8], align 16
@e = external dso_local local_unnamed_addr global [160014 x %struct.edge], align 16
@tot = external dso_local local_unnamed_addr global i32, align 4
@head = external dso_local local_unnamed_addr global [80007 x i32], align 16
@ver = external dso_local local_unnamed_addr global [160014 x i32], align 16
@R = external dso_local local_unnamed_addr global [160014 x i32], align 16
@first = external dso_local local_unnamed_addr global [80007 x i32], 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 [26 x i8], ptr @vis, i64 0, i64 %3
  store i8 1, ptr %4, align 1, !tbaa !5
  %5 = load i32, ptr @tot, align 4, !tbaa !9
  %6 = add nsw i32 %5, 1
  store i32 %6, ptr @tot, align 4, !tbaa !9
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds [160014 x i32], ptr @ver, i64 0, i64 %7
  store i32 %0, ptr %8, align 4, !tbaa !9
  %9 = getelementptr inbounds [80007 x i32], ptr @first, i64 0, i64 %3
  store i32 %6, ptr %9, align 4, !tbaa !9
  %10 = getelementptr inbounds [160014 x i32], ptr @R, i64 0, i64 %7
  store i32 %1, ptr %10, align 4, !tbaa !9
  %11 = getelementptr inbounds [80007 x i32], ptr @head, i64 0, i64 %3
  %.013 = load i32, ptr %11, align 4, !tbaa !9
  %.not14 = icmp eq i32 %.013, -1
  br i1 %.not14, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2
  %12 = add nsw i32 %1, 1
  br label %13

._crit_edge:                                      ; preds = %28, %2
  ret void

13:                                               ; preds = %.lr.ph, %28
  %.015 = phi i32 [ %.013, %.lr.ph ], [ %.0, %28 ]
  %14 = sext i32 %.015 to i64
  %15 = getelementptr inbounds [160014 x %struct.edge], ptr @e, i64 0, i64 %14
  %16 = getelementptr inbounds i8, ptr %15, i64 4
  %17 = load i32, ptr %16, align 4, !tbaa !11
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [26 x i8], ptr @vis, i64 0, i64 %18
  %20 = load i8, ptr %19, align 1, !tbaa !5, !range !13, !noundef !14
  %21 = trunc nuw i8 %20 to i1
  br i1 %21, label %28, label %22

22:                                               ; preds = %13
  tail call void @_Z3dfsii(i32 noundef %17, i32 noundef %12)
  %23 = load i32, ptr @tot, align 4, !tbaa !9
  %24 = add nsw i32 %23, 1
  store i32 %24, ptr @tot, align 4, !tbaa !9
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds [160014 x i32], ptr @ver, i64 0, i64 %25
  store i32 %0, ptr %26, align 4, !tbaa !9
  %27 = getelementptr inbounds [160014 x i32], ptr @R, i64 0, i64 %25
  store i32 %1, ptr %27, align 4, !tbaa !9
  br label %28

28:                                               ; preds = %13, %22
  %29 = getelementptr inbounds i8, ptr %15, i64 8
  %.0 = load i32, ptr %29, align 4, !tbaa !9
  %.not = icmp eq i32 %.0, -1
  br i1 %.not, label %._crit_edge, label %13, !llvm.loop !15
}

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, !6, i64 0}
!6 = !{!"bool", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 4}
!12 = !{!"_ZTS4edge", !10, i64 0, !10, i64 4, !10, i64 8}
!13 = !{i8 0, i8 2}
!14 = !{}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}


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