; LLVM IR from ahampriyanshu/algo-ds-101 :: Algorithms/Graph/DFS/Depth First Search[DFS].ll (ZN5GraphC2Ei)

; 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: mustprogress uwtable
define dso_local void @_ZN5GraphC2Ei(ptr noundef nonnull align 8 dereferenceable(24) %0, i32 noundef %1) unnamed_addr #0 align 2 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  %5 = load ptr, ptr %3, align 8
  %6 = load i32, ptr %4, align 4, !tbaa !9
  %7 = getelementptr inbounds %class.Graph, ptr %5, i32 0, i32 0
  store i32 %6, ptr %7, align 8, !tbaa !11
  %8 = load i32, ptr %4, align 4, !tbaa !9
  %9 = sext i32 %8 to i64
  %10 = call { i64, i1 } @llvm.umul.with.overflow.i64(i64 %9, i64 24)
  %11 = extractvalue { i64, i1 } %10, 1
  %12 = extractvalue { i64, i1 } %10, 0
  %13 = call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 %12, i64 8)
  %14 = extractvalue { i64, i1 } %13, 1
  %15 = or i1 %11, %14
  %16 = extractvalue { i64, i1 } %13, 0
  %17 = select i1 %15, i64 -1, i64 %16
  %18 = call noalias noundef nonnull ptr @_Znam(i64 noundef %17) #4
  store i64 %9, ptr %18, align 16
  %19 = getelementptr inbounds i8, ptr %18, i64 8
  %20 = icmp eq i64 %9, 0
  br i1 %20, label %27, label %21

21:                                               ; preds = %2
  %22 = getelementptr inbounds %"class.std::__cxx11::list", ptr %19, i64 %9
  br label %23

23:                                               ; preds = %23, %21
  %24 = phi ptr [ %19, %21 ], [ %25, %23 ]
  call void @_ZNSt7__cxx114listIiSaIiEEC2Ev(ptr noundef nonnull align 8 dereferenceable(24) %24) #5
  %25 = getelementptr inbounds %"class.std::__cxx11::list", ptr %24, i64 1
  %26 = icmp eq ptr %25, %22
  br i1 %26, label %27, label %23

27:                                               ; preds = %23, %2
  %28 = getelementptr inbounds %class.Graph, ptr %5, i32 0, i32 1
  store ptr %19, ptr %28, align 8, !tbaa !13
  %29 = load i32, ptr %4, align 4, !tbaa !9
  %30 = sext i32 %29 to i64
  %31 = call noalias noundef nonnull ptr @_Znam(i64 noundef %30) #4
  %32 = getelementptr inbounds %class.Graph, ptr %5, i32 0, i32 2
  store ptr %31, ptr %32, align 8, !tbaa !14
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare { i64, i1 } @llvm.umul.with.overflow.i64(i64, i64) #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare { i64, i1 } @llvm.uadd.with.overflow.i64(i64, i64) #1

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znam(i64 noundef) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt7__cxx114listIiSaIiEEC2Ev(ptr noundef nonnull align 8 dereferenceable(24)) unnamed_addr #3 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 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #2 = { nobuiltin allocsize(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 = { 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 #4 = { builtin allocsize(0) }
attributes #5 = { 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}


; 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
define dso_local void @_ZN5GraphC2Ei(ptr nocapture noundef nonnull writeonly align 8 dereferenceable(24) %0, i32 noundef %1) unnamed_addr #0 align 2 {
  store i32 %1, ptr %0, align 8, !tbaa !5
  %3 = sext i32 %1 to i64
  %4 = tail call { i64, i1 } @llvm.umul.with.overflow.i64(i64 %3, i64 24)
  %5 = extractvalue { i64, i1 } %4, 1
  %6 = extractvalue { i64, i1 } %4, 0
  %7 = tail call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 %6, i64 8)
  %8 = extractvalue { i64, i1 } %7, 1
  %9 = or i1 %5, %8
  %10 = extractvalue { i64, i1 } %7, 0
  %11 = select i1 %9, i64 -1, i64 %10
  %12 = tail call noalias noundef nonnull ptr @_Znam(i64 noundef %11) #4
  store i64 %3, ptr %12, align 16
  %13 = getelementptr inbounds i8, ptr %12, i64 8
  %14 = icmp eq i32 %1, 0
  br i1 %14, label %.loopexit, label %15

15:                                               ; preds = %2
  %16 = getelementptr inbounds %"class.std::__cxx11::list", ptr %13, i64 %3
  br label %17

17:                                               ; preds = %17, %15
  %18 = phi ptr [ %13, %15 ], [ %19, %17 ]
  tail call void @_ZNSt7__cxx114listIiSaIiEEC2Ev(ptr noundef nonnull align 8 dereferenceable(24) %18) #5
  %19 = getelementptr inbounds i8, ptr %18, i64 24
  %20 = icmp eq ptr %19, %16
  br i1 %20, label %.loopexit, label %17

.loopexit:                                        ; preds = %17, %2
  %21 = getelementptr inbounds i8, ptr %0, i64 8
  store ptr %13, ptr %21, align 8, !tbaa !11
  %22 = tail call noalias noundef nonnull ptr @_Znam(i64 noundef %3) #4
  %23 = getelementptr inbounds i8, ptr %0, i64 16
  store ptr %22, ptr %23, align 8, !tbaa !12
  ret void
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare { i64, i1 } @llvm.umul.with.overflow.i64(i64, i64) #1

; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare { i64, i1 } @llvm.uadd.with.overflow.i64(i64, i64) #1

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znam(i64 noundef) local_unnamed_addr #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt7__cxx114listIiSaIiEEC2Ev(ptr noundef nonnull align 8 dereferenceable(24)) unnamed_addr #3 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 nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #2 = { nobuiltin allocsize(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 = { 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 #4 = { builtin allocsize(0) }
attributes #5 = { 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 = !{!6, !10, i64 8}
!12 = !{!6, !10, i64 16}


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