; LLVM IR from UtkarshPathrabe/Competitive-Coding :: Model Algorithms/Graphs (Eulerian Path and Circuit in Undirected Graph)

; 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"

%class.Graph = type { i32, ptr }
%"class.std::__cxx11::list" = type { %"class.std::__cxx11::_List_base" }
%"class.std::__cxx11::_List_base" = type { %"struct.std::__cxx11::_List_base<int, std::allocator<int>>::_List_impl" }
%"struct.std::__cxx11::_List_base<int, std::allocator<int>>::_List_impl" = type { %"struct.std::__detail::_List_node_header" }
%"struct.std::__detail::_List_node_header" = type { %"struct.std::__detail::_List_node_base", i64 }
%"struct.std::__detail::_List_node_base" = type { ptr, ptr }

; 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
declare dso_local noundef zeroext i1 @_ZN5Graph11isConnectedEv(ptr noundef nonnull align 8 dereferenceable(16)) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt7__cxx114listIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_ZN5Graph10isEulerianEv(ptr noundef nonnull align 8 dereferenceable(16) %0) #1 align 2 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  %7 = load ptr, ptr %3, align 8
  %8 = call noundef zeroext i1 @_ZN5Graph11isConnectedEv(ptr noundef nonnull align 8 dereferenceable(16) %7)
  br i1 %8, label %10, label %9

9:                                                ; preds = %1
  store i32 0, ptr %2, align 4
  br label %43

10:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 0, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %30, %10
  %12 = load i32, ptr %5, align 4, !tbaa !9
  %13 = getelementptr inbounds %class.Graph, ptr %7, i32 0, i32 0
  %14 = load i32, ptr %13, align 8, !tbaa !11
  %15 = icmp slt i32 %12, %14
  br i1 %15, label %17, label %16

16:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  br label %33

17:                                               ; preds = %11
  %18 = getelementptr inbounds %class.Graph, ptr %7, i32 0, i32 1
  %19 = load ptr, ptr %18, align 8, !tbaa !13
  %20 = load i32, ptr %5, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds %"class.std::__cxx11::list", ptr %19, i64 %21
  %23 = call noundef i64 @_ZNKSt7__cxx114listIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %22) #3
  %24 = urem i64 %23, 2
  %25 = icmp eq i64 %24, 1
  br i1 %25, label %26, label %29

26:                                               ; preds = %17
  %27 = load i32, ptr %4, align 4, !tbaa !9
  %28 = add nsw i32 %27, 1
  store i32 %28, ptr %4, align 4, !tbaa !9
  br label %29

29:                                               ; preds = %26, %17
  br label %30

30:                                               ; preds = %29
  %31 = load i32, ptr %5, align 4, !tbaa !9
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %5, align 4, !tbaa !9
  br label %11, !llvm.loop !14

33:                                               ; preds = %16
  %34 = load i32, ptr %4, align 4, !tbaa !9
  %35 = icmp sgt i32 %34, 2
  br i1 %35, label %36, label %37

36:                                               ; preds = %33
  store i32 0, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %42

37:                                               ; preds = %33
  %38 = load i32, ptr %4, align 4, !tbaa !9
  %39 = icmp ne i32 %38, 0
  %40 = zext i1 %39 to i64
  %41 = select i1 %39, i32 1, i32 2
  store i32 %41, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %42

42:                                               ; preds = %37, %36
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  br label %43

43:                                               ; preds = %42, %9
  %44 = load i32, ptr %2, align 4
  ret i32 %44
}

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 = { 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 #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 = !{!"any pointer", !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 0}
!12 = !{!"_ZTS5Graph", !10, i64 0, !6, i64 8}
!13 = !{!12, !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"

%"class.std::__cxx11::list" = type { %"class.std::__cxx11::_List_base" }
%"class.std::__cxx11::_List_base" = type { %"struct.std::__cxx11::_List_base<int, std::allocator<int>>::_List_impl" }
%"struct.std::__cxx11::_List_base<int, std::allocator<int>>::_List_impl" = type { %"struct.std::__detail::_List_node_header" }
%"struct.std::__detail::_List_node_header" = type { %"struct.std::__detail::_List_node_base", i64 }
%"struct.std::__detail::_List_node_base" = type { ptr, ptr }

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_ZN5Graph11isConnectedEv(ptr noundef nonnull align 8 dereferenceable(16)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt7__cxx114listIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef range(i32 0, 3) i32 @_ZN5Graph10isEulerianEv(ptr noundef nonnull align 8 dereferenceable(16) %0) local_unnamed_addr #0 align 2 {
  %2 = tail call noundef zeroext i1 @_ZN5Graph11isConnectedEv(ptr noundef nonnull align 8 dereferenceable(16) %0)
  br i1 %2, label %.preheader, label %.thread

.preheader:                                       ; preds = %1
  %3 = load i32, ptr %0, align 8, !tbaa !5
  %4 = icmp sgt i32 %3, 0
  br i1 %4, label %.lr.ph, label %.thread

.lr.ph:                                           ; preds = %.preheader
  %5 = getelementptr inbounds i8, ptr %0, i64 8
  br label %7

._crit_edge:                                      ; preds = %7
  %6 = icmp sgt i32 %spec.select, 2
  %.not = icmp eq i32 %spec.select, 0
  %. = select i1 %.not, i32 2, i32 1
  %spec.select20 = select i1 %6, i32 0, i32 %.
  br label %.thread

7:                                                ; preds = %.lr.ph, %7
  %indvars.iv = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next, %7 ]
  %.0711 = phi i32 [ 0, %.lr.ph ], [ %spec.select, %7 ]
  %8 = load ptr, ptr %5, align 8, !tbaa !11
  %9 = getelementptr inbounds %"class.std::__cxx11::list", ptr %8, i64 %indvars.iv
  %10 = tail call noundef i64 @_ZNKSt7__cxx114listIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %9) #2
  %11 = trunc i64 %10 to i32
  %12 = and i32 %11, 1
  %spec.select = add i32 %12, %.0711
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %13 = load i32, ptr %0, align 8, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = icmp slt i64 %indvars.iv.next, %14
  br i1 %15, label %7, label %._crit_edge, !llvm.loop !12

.thread:                                          ; preds = %._crit_edge, %.preheader, %1
  %.19 = phi i32 [ 0, %1 ], [ 2, %.preheader ], [ %spec.select20, %._crit_edge ]
  ret i32 %.19
}

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 = { 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 #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, !7, i64 0}
!6 = !{!"_ZTS5Graph", !7, i64 0, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !10, i64 8}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass