; LLVM IR from amritansh22/Data-Structures-and-Algorithms-in-cpp :: Graph/FloydCycleFindingAlgo.ll (Z10detectLoopP4Node)

; 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.std::unordered_set" = type { %"class.std::_Hashtable" }
%"class.std::_Hashtable" = type { ptr, i64, %"struct.std::__detail::_Hash_node_base", i64, %"struct.std::__detail::_Prime_rehash_policy", ptr }
%"struct.std::__detail::_Hash_node_base" = type { ptr }
%"struct.std::__detail::_Prime_rehash_policy" = type { float, i64 }
%"struct.std::__detail::_Node_iterator" = type { %"struct.std::__detail::_Node_iterator_base" }
%"struct.std::__detail::_Node_iterator_base" = type { ptr }
%"struct.std::pair" = type <{ %"struct.std::__detail::_Node_iterator", i8, [7 x i8] }>
%struct.Node = type { i32, 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
define dso_local noundef zeroext i1 @_Z10detectLoopP4Node(ptr noundef %0) #1 personality ptr @__gxx_personality_v0 {
  %2 = alloca i1, align 1
  %3 = alloca ptr, align 8
  %4 = alloca %"class.std::unordered_set", align 8
  %5 = alloca %"struct.std::__detail::_Node_iterator", align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca %"struct.std::__detail::_Node_iterator", align 8
  %9 = alloca i32, align 4
  %10 = alloca %"struct.std::pair", align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 56, ptr %4) #4
  call void @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EEC2Ev(ptr noundef nonnull align 8 dereferenceable(56) %4) #4
  br label %11

11:                                               ; preds = %30, %1
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = icmp ne ptr %12, null
  br i1 %13, label %14, label %42

14:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  %15 = invoke ptr @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EE4findERKS1_(ptr noundef nonnull align 8 dereferenceable(56) %4, ptr noundef nonnull align 8 dereferenceable(8) %3)
          to label %16 unwind label %24

16:                                               ; preds = %14
  %17 = getelementptr inbounds %"struct.std::__detail::_Node_iterator", ptr %5, i32 0, i32 0
  %18 = getelementptr inbounds %"struct.std::__detail::_Node_iterator_base", ptr %17, i32 0, i32 0
  store ptr %15, ptr %18, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %19 = call ptr @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EE3endEv(ptr noundef nonnull align 8 dereferenceable(56) %4) #4
  %20 = getelementptr inbounds %"struct.std::__detail::_Node_iterator", ptr %8, i32 0, i32 0
  %21 = getelementptr inbounds %"struct.std::__detail::_Node_iterator_base", ptr %20, i32 0, i32 0
  store ptr %19, ptr %21, align 8
  %22 = call noundef zeroext i1 @_ZNSt8__detailneERKNS_19_Node_iterator_baseIP4NodeLb0EEES5_(ptr noundef nonnull align 8 dereferenceable(8) %5, ptr noundef nonnull align 8 dereferenceable(8) %8) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #4
  br i1 %22, label %23, label %28

23:                                               ; preds = %16
  store i1 true, ptr %2, align 1
  store i32 1, ptr %9, align 4
  br label %43

24:                                               ; preds = %14
  %25 = landingpad { ptr, i32 }
          cleanup
  %26 = extractvalue { ptr, i32 } %25, 0
  store ptr %26, ptr %6, align 8
  %27 = extractvalue { ptr, i32 } %25, 1
  store i32 %27, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #4
  br label %45

28:                                               ; preds = %16
  %29 = invoke { ptr, i8 } @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EE6insertERKS1_(ptr noundef nonnull align 8 dereferenceable(56) %4, ptr noundef nonnull align 8 dereferenceable(8) %3)
          to label %30 unwind label %38

30:                                               ; preds = %28
  %31 = getelementptr inbounds { ptr, i8 }, ptr %10, i32 0, i32 0
  %32 = extractvalue { ptr, i8 } %29, 0
  store ptr %32, ptr %31, align 8
  %33 = getelementptr inbounds { ptr, i8 }, ptr %10, i32 0, i32 1
  %34 = extractvalue { ptr, i8 } %29, 1
  store i8 %34, ptr %33, align 8
  %35 = load ptr, ptr %3, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.Node, ptr %35, i32 0, i32 1
  %37 = load ptr, ptr %36, align 8, !tbaa !9
  store ptr %37, ptr %3, align 8, !tbaa !5
  br label %11, !llvm.loop !12

38:                                               ; preds = %28
  %39 = landingpad { ptr, i32 }
          cleanup
  %40 = extractvalue { ptr, i32 } %39, 0
  store ptr %40, ptr %6, align 8
  %41 = extractvalue { ptr, i32 } %39, 1
  store i32 %41, ptr %7, align 4
  br label %45

42:                                               ; preds = %11
  store i1 false, ptr %2, align 1
  store i32 1, ptr %9, align 4
  br label %43

43:                                               ; preds = %42, %23
  call void @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EED2Ev(ptr noundef nonnull align 8 dereferenceable(56) %4) #4
  call void @llvm.lifetime.end.p0(i64 56, ptr %4) #4
  %44 = load i1, ptr %2, align 1
  ret i1 %44

45:                                               ; preds = %38, %24
  call void @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EED2Ev(ptr noundef nonnull align 8 dereferenceable(56) %4) #4
  call void @llvm.lifetime.end.p0(i64 56, ptr %4) #4
  br label %46

46:                                               ; preds = %45
  %47 = load ptr, ptr %6, align 8
  %48 = load i32, ptr %7, align 4
  %49 = insertvalue { ptr, i32 } poison, ptr %47, 0
  %50 = insertvalue { ptr, i32 } %49, i32 %48, 1
  resume { ptr, i32 } %50
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EEC2Ev(ptr noundef nonnull align 8 dereferenceable(56)) unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNSt8__detailneERKNS_19_Node_iterator_baseIP4NodeLb0EEES5_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) #2

; Function Attrs: mustprogress uwtable
declare dso_local ptr @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EE4findERKS1_(ptr noundef nonnull align 8 dereferenceable(56), ptr noundef nonnull align 8 dereferenceable(8)) #1 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EE3endEv(ptr noundef nonnull align 8 dereferenceable(56)) #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local { ptr, i8 } @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EE6insertERKS1_(ptr noundef nonnull align 8 dereferenceable(56), ptr noundef nonnull align 8 dereferenceable(8)) #1 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EED2Ev(ptr noundef nonnull align 8 dereferenceable(56)) unnamed_addr #3 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 = { inlinehint 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 = { 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, !6, i64 8}
!10 = !{!"_ZTS4Node", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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::unordered_set" = type { %"class.std::_Hashtable" }
%"class.std::_Hashtable" = type { ptr, i64, %"struct.std::__detail::_Hash_node_base", i64, %"struct.std::__detail::_Prime_rehash_policy", ptr }
%"struct.std::__detail::_Hash_node_base" = type { ptr }
%"struct.std::__detail::_Prime_rehash_policy" = type { float, i64 }
%"struct.std::__detail::_Node_iterator" = type { %"struct.std::__detail::_Node_iterator_base" }
%"struct.std::__detail::_Node_iterator_base" = type { ptr }

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

; Function Attrs: mustprogress 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 noundef zeroext i1 @_Z10detectLoopP4Node(ptr noundef %0) local_unnamed_addr #1 personality ptr @__gxx_personality_v0 {
  %2 = alloca ptr, align 8
  %3 = alloca %"class.std::unordered_set", align 8
  %4 = alloca %"struct.std::__detail::_Node_iterator", align 8
  %5 = alloca %"struct.std::__detail::_Node_iterator", align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 56, ptr nonnull %3) #4
  call void @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EEC2Ev(ptr noundef nonnull align 8 dereferenceable(56) %3) #4
  %.not7.not = icmp eq ptr %0, null
  br i1 %.not7.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %14
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #4
  %6 = invoke ptr @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EE4findERKS1_(ptr noundef nonnull align 8 dereferenceable(56) %3, ptr noundef nonnull align 8 dereferenceable(8) %2)
          to label %7 unwind label %10

7:                                                ; preds = %.lr.ph
  store ptr %6, ptr %4, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %5) #4
  %8 = call ptr @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EE3endEv(ptr noundef nonnull align 8 dereferenceable(56) %3) #4
  store ptr %8, ptr %5, align 8
  %9 = call noundef zeroext i1 @_ZNSt8__detailneERKNS_19_Node_iterator_baseIP4NodeLb0EEES5_(ptr noundef nonnull align 8 dereferenceable(8) %4, ptr noundef nonnull align 8 dereferenceable(8) %5) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %5) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %4) #4
  br i1 %9, label %._crit_edge, label %12

10:                                               ; preds = %.lr.ph
  %11 = landingpad { ptr, i32 }
          cleanup
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %4) #4
  br label %20

12:                                               ; preds = %7
  %13 = invoke { ptr, i8 } @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EE6insertERKS1_(ptr noundef nonnull align 8 dereferenceable(56) %3, ptr noundef nonnull align 8 dereferenceable(8) %2)
          to label %14 unwind label %18

14:                                               ; preds = %12
  %15 = load ptr, ptr %2, align 8, !tbaa !5
  %16 = getelementptr inbounds i8, ptr %15, i64 8
  %17 = load ptr, ptr %16, align 8, !tbaa !9
  store ptr %17, ptr %2, align 8, !tbaa !5
  %.not.not = icmp eq ptr %17, null
  br i1 %.not.not, label %._crit_edge, label %.lr.ph, !llvm.loop !12

18:                                               ; preds = %12
  %19 = landingpad { ptr, i32 }
          cleanup
  br label %20

._crit_edge:                                      ; preds = %7, %14, %1
  %.not.lcssa = phi i1 [ false, %1 ], [ %9, %14 ], [ %9, %7 ]
  call void @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EED2Ev(ptr noundef nonnull align 8 dereferenceable(56) %3) #4
  call void @llvm.lifetime.end.p0(i64 56, ptr nonnull %3) #4
  ret i1 %.not.lcssa

20:                                               ; preds = %18, %10
  %.pn = phi { ptr, i32 } [ %19, %18 ], [ %11, %10 ]
  call void @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EED2Ev(ptr noundef nonnull align 8 dereferenceable(56) %3) #4
  call void @llvm.lifetime.end.p0(i64 56, ptr nonnull %3) #4
  resume { ptr, i32 } %.pn
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EEC2Ev(ptr noundef nonnull align 8 dereferenceable(56)) unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNSt8__detailneERKNS_19_Node_iterator_baseIP4NodeLb0EEES5_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #2

; Function Attrs: mustprogress uwtable
declare dso_local ptr @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EE4findERKS1_(ptr noundef nonnull align 8 dereferenceable(56), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #1 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EE3endEv(ptr noundef nonnull align 8 dereferenceable(56)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local { ptr, i8 } @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EE6insertERKS1_(ptr noundef nonnull align 8 dereferenceable(56), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #1 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZNSt13unordered_setIP4NodeSt4hashIS1_ESt8equal_toIS1_ESaIS1_EED2Ev(ptr noundef nonnull align 8 dereferenceable(56)) unnamed_addr #3 align 2

attributes #0 = { mustprogress 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 = { inlinehint 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 = { 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, !6, i64 8}
!10 = !{!"_ZTS4Node", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


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