; LLVM IR from UtkarshPathrabe/Competitive-Coding :: Model Algorithms/Graphs/Euler Circuit in Directed Graph.ll (ZN5Graph15isEulerianCycleEv)

; 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, 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 @_ZN5Graph4isSCEv(ptr noundef nonnull align 8 dereferenceable(24)) #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_ZN5Graph15isEulerianCycleEv(ptr noundef nonnull align 8 dereferenceable(24) %0) #1 align 2 {
  %2 = alloca i1, align 1
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  %6 = load ptr, ptr %3, align 8
  %7 = call noundef zeroext i1 @_ZN5Graph4isSCEv(ptr noundef nonnull align 8 dereferenceable(24) %6)
  br i1 %7, label %9, label %8

8:                                                ; preds = %1
  store i1 false, ptr %2, align 1
  br label %39

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

10:                                               ; preds = %33, %9
  %11 = load i32, ptr %4, align 4, !tbaa !9
  %12 = getelementptr inbounds %class.Graph, ptr %6, i32 0, i32 0
  %13 = load i32, ptr %12, align 8, !tbaa !11
  %14 = icmp slt i32 %11, %13
  br i1 %14, label %16, label %15

15:                                               ; preds = %10
  store i32 2, ptr %5, align 4
  br label %36

16:                                               ; preds = %10
  %17 = getelementptr inbounds %class.Graph, ptr %6, i32 0, i32 1
  %18 = load ptr, ptr %17, align 8, !tbaa !13
  %19 = load i32, ptr %4, align 4, !tbaa !9
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds %"class.std::__cxx11::list", ptr %18, i64 %20
  %22 = call noundef i64 @_ZNKSt7__cxx114listIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %21) #3
  %23 = getelementptr inbounds %class.Graph, ptr %6, i32 0, i32 2
  %24 = load ptr, ptr %23, align 8, !tbaa !14
  %25 = load i32, ptr %4, align 4, !tbaa !9
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds i32, ptr %24, i64 %26
  %28 = load i32, ptr %27, align 4, !tbaa !9
  %29 = sext i32 %28 to i64
  %30 = icmp ne i64 %22, %29
  br i1 %30, label %31, label %32

31:                                               ; preds = %16
  store i1 false, ptr %2, align 1
  store i32 1, ptr %5, align 4
  br label %36

32:                                               ; preds = %16
  br label %33

33:                                               ; preds = %32
  %34 = load i32, ptr %4, align 4, !tbaa !9
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %4, align 4, !tbaa !9
  br label %10, !llvm.loop !15

36:                                               ; preds = %31, %15
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  %37 = load i32, ptr %5, align 4
  switch i32 %37, label %41 [
    i32 2, label %38
    i32 1, label %39
  ]

38:                                               ; preds = %36
  store i1 true, ptr %2, align 1
  br label %39

39:                                               ; preds = %38, %36, %8
  %40 = load i1, ptr %2, align 1
  ret i1 %40

41:                                               ; preds = %36
  unreachable
}

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

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, !6, i64 16}
!13 = !{!12, !6, i64 8}
!14 = !{!12, !6, i64 16}
!15 = distinct !{!15, !16}
!16 = !{!"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 @_ZN5Graph4isSCEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_ZN5Graph15isEulerianCycleEv(ptr noundef nonnull align 8 dereferenceable(24) %0) local_unnamed_addr #0 align 2 {
  %2 = tail call noundef zeroext i1 @_ZN5Graph4isSCEv(ptr noundef nonnull align 8 dereferenceable(24) %0)
  br i1 %2, label %.preheader, label %.loopexit

.preheader:                                       ; preds = %1
  %3 = getelementptr inbounds i8, ptr %0, i64 8
  %4 = load i32, ptr %0, align 8, !tbaa !5
  %5 = icmp slt i32 %4, 1
  br i1 %5, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader
  %6 = getelementptr inbounds i8, ptr %0, i64 16
  br label %10

7:                                                ; preds = %10
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %8 = load i32, ptr %0, align 8, !tbaa !5
  %9 = sext i32 %8 to i64
  %.not12 = icmp slt i64 %indvars.iv.next, %9
  br i1 %.not12, label %10, label %.loopexit, !llvm.loop !11

10:                                               ; preds = %.lr.ph, %7
  %indvars.iv = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next, %7 ]
  %11 = load ptr, ptr %3, align 8, !tbaa !13
  %12 = getelementptr inbounds %"class.std::__cxx11::list", ptr %11, i64 %indvars.iv
  %13 = tail call noundef i64 @_ZNKSt7__cxx114listIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %12) #2
  %14 = load ptr, ptr %6, align 8, !tbaa !14
  %15 = getelementptr inbounds i32, ptr %14, i64 %indvars.iv
  %16 = load i32, ptr %15, align 4, !tbaa !15
  %17 = sext i32 %16 to i64
  %.not = icmp eq i64 %13, %17
  br i1 %.not, label %7, label %.loopexit

.loopexit:                                        ; preds = %10, %7, %.preheader, %1
  %.1 = phi i1 [ false, %1 ], [ true, %.preheader ], [ %.not, %7 ], [ %.not, %10 ]
  ret i1 %.1
}

; 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

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


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