; LLVM IR from Dev-XYS/Algorithms :: Eulerian-Tour(Digraph).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, i32 }

@V = external dso_local global [100010 x %struct.vertex], align 16
@E = external dso_local global [200010 x %struct.edge], align 16
@path = external dso_local global [200010 x i32], align 16
@pc = external dso_local global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z8del_edgei(i32 noundef) #0

; 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

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3DFSii(i32 noundef %0, i32 noundef %1) #2 {
  %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
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  %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 0
  %10 = load i32, ptr %9, align 16, !tbaa !9
  store i32 %10, ptr %5, align 4, !tbaa !5
  %11 = load i32, ptr %5, align 4, !tbaa !5
  call void @_Z8del_edgei(i32 noundef %11)
  %12 = load i32, ptr %5, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [200010 x %struct.edge], ptr @E, i64 0, i64 %13
  %15 = getelementptr inbounds %struct.edge, ptr %14, i32 0, i32 1
  %16 = load i32, ptr %15, align 4, !tbaa !12
  %17 = load i32, ptr %4, align 4, !tbaa !5
  %18 = icmp ne i32 %16, %17
  br i1 %18, label %19, label %26

19:                                               ; preds = %2
  %20 = load i32, ptr %5, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds [200010 x %struct.edge], ptr @E, i64 0, i64 %21
  %23 = getelementptr inbounds %struct.edge, ptr %22, i32 0, i32 1
  %24 = load i32, ptr %23, align 4, !tbaa !12
  %25 = load i32, ptr %4, align 4, !tbaa !5
  call void @_Z3DFSii(i32 noundef %24, i32 noundef %25)
  br label %26

26:                                               ; preds = %19, %2
  %27 = load i32, ptr %5, align 4, !tbaa !5
  %28 = load i32, ptr @pc, align 4, !tbaa !5
  %29 = add nsw i32 %28, 1
  store i32 %29, ptr @pc, align 4, !tbaa !5
  %30 = sext i32 %28 to i64
  %31 = getelementptr inbounds [200010 x i32], ptr @path, i64 0, i64 %30
  store i32 %27, ptr %31, align 4, !tbaa !5
  br label %32

32:                                               ; preds = %39, %26
  %33 = load i32, ptr %3, align 4, !tbaa !5
  %34 = sext i32 %33 to i64
  %35 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %34
  %36 = getelementptr inbounds %struct.vertex, ptr %35, i32 0, i32 0
  %37 = load i32, ptr %36, align 16, !tbaa !9
  %38 = icmp ne i32 %37, 0
  br i1 %38, label %39, label %42

39:                                               ; preds = %32
  %40 = load i32, ptr %3, align 4, !tbaa !5
  %41 = load i32, ptr %3, align 4, !tbaa !5
  call void @_Z3DFSii(i32 noundef %40, i32 noundef %41)
  br label %32, !llvm.loop !14

42:                                               ; preds = %32
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret void
}

attributes #0 = { mustprogress nounwind 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 = { 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 #3 = { 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, !6, i64 0}
!10 = !{!"_ZTS6vertex", !6, i64 0, !6, i64 4, !6, i64 8, !11, i64 12}
!11 = !{!"bool", !7, i64 0}
!12 = !{!13, !6, i64 4}
!13 = !{!"_ZTS4edge", !6, i64 0, !6, i64 4, !6, i64 8}
!14 = distinct !{!14, !15}
!15 = !{!"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, 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
@path = external dso_local local_unnamed_addr global [200010 x i32], align 16
@pc = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z8del_edgei(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind 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 = load i32, ptr %4, align 16, !tbaa !5
  tail call void @_Z8del_edgei(i32 noundef %5)
  %6 = sext i32 %5 to i64
  %7 = getelementptr inbounds [200010 x %struct.edge], ptr @E, i64 0, i64 %6, i32 1
  %8 = load i32, ptr %7, align 4, !tbaa !11
  %.not = icmp eq i32 %8, %1
  br i1 %.not, label %10, label %9

9:                                                ; preds = %2
  tail call void @_Z3DFSii(i32 noundef %8, i32 noundef %1)
  br label %10

10:                                               ; preds = %9, %2
  %11 = load i32, ptr @pc, align 4, !tbaa !13
  %12 = add nsw i32 %11, 1
  store i32 %12, ptr @pc, align 4, !tbaa !13
  %13 = sext i32 %11 to i64
  %14 = getelementptr inbounds [200010 x i32], ptr @path, i64 0, i64 %13
  store i32 %5, ptr %14, align 4, !tbaa !13
  %15 = load i32, ptr %4, align 16, !tbaa !5
  %.not1112 = icmp eq i32 %15, 0
  br i1 %.not1112, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %10, %.lr.ph
  tail call void @_Z3DFSii(i32 noundef %0, i32 noundef %0)
  %16 = load i32, ptr %4, align 16, !tbaa !5
  %.not11 = icmp eq i32 %16, 0
  br i1 %.not11, label %._crit_edge, label %.lr.ph, !llvm.loop !14

._crit_edge:                                      ; preds = %.lr.ph, %10
  ret void
}

attributes #0 = { mustprogress nounwind 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, !7, i64 0}
!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 = !{!12, !7, i64 4}
!12 = !{!"_ZTS4edge", !7, i64 0, !7, i64 4, !7, i64 8}
!13 = !{!7, !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


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