; LLVM IR from PetarV-/Algorithms :: Graph Algorithms/Kosaraju's Algorithm.ll (Z8Kosarajuv)

; 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::stack" = type { %"class.std::deque" }
%"class.std::deque" = type { %"class.std::_Deque_base" }
%"class.std::_Deque_base" = type { %"struct.std::_Deque_base<int, std::allocator<int>>::_Deque_impl" }
%"struct.std::_Deque_base<int, std::allocator<int>>::_Deque_impl" = type { %"struct.std::_Deque_base<int, std::allocator<int>>::_Deque_impl_data" }
%"struct.std::_Deque_base<int, std::allocator<int>>::_Deque_impl_data" = type { ptr, i64, %"struct.std::_Deque_iterator", %"struct.std::_Deque_iterator" }
%"struct.std::_Deque_iterator" = type { ptr, ptr, ptr, ptr }

@n = external dso_local global i32, align 4
@S = external dso_local global %"class.std::stack", align 8
@visited = external dso_local global [20001 x i8], align 16
@numComponents = external dso_local global i32, align 4
@.str.5 = external hidden unnamed_addr constant [15 x i8], align 1
@.str.6 = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z14kosaraju_dfs_1i(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
declare dso_local void @_Z14kosaraju_dfs_2i(i32 noundef) #0

declare i32 @printf(ptr noundef, ...) #2

; Function Attrs: mustprogress uwtable
define dso_local void @_Z8Kosarajuv() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #4
  store i32 0, ptr %1, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %18, %0
  %5 = load i32, ptr %1, align 4, !tbaa !5
  %6 = load i32, ptr @n, align 4, !tbaa !5
  %7 = icmp slt i32 %5, %6
  br i1 %7, label %9, label %8

8:                                                ; preds = %4
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #4
  br label %21

9:                                                ; preds = %4
  %10 = load i32, ptr %1, align 4, !tbaa !5
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds [20001 x i8], ptr @visited, i64 0, i64 %11
  %13 = load i8, ptr %12, align 1, !tbaa !9, !range !11, !noundef !12
  %14 = trunc i8 %13 to i1
  br i1 %14, label %17, label %15

15:                                               ; preds = %9
  %16 = load i32, ptr %1, align 4, !tbaa !5
  call void @_Z14kosaraju_dfs_1i(i32 noundef %16)
  br label %17

17:                                               ; preds = %15, %9
  br label %18

18:                                               ; preds = %17
  %19 = load i32, ptr %1, align 4, !tbaa !5
  %20 = add nsw i32 %19, 1
  store i32 %20, ptr %1, align 4, !tbaa !5
  br label %4, !llvm.loop !13

21:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #4
  store i32 0, ptr %2, align 4, !tbaa !5
  br label %22

22:                                               ; preds = %31, %21
  %23 = load i32, ptr %2, align 4, !tbaa !5
  %24 = load i32, ptr @n, align 4, !tbaa !5
  %25 = icmp slt i32 %23, %24
  br i1 %25, label %27, label %26

26:                                               ; preds = %22
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #4
  br label %34

27:                                               ; preds = %22
  %28 = load i32, ptr %2, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [20001 x i8], ptr @visited, i64 0, i64 %29
  store i8 0, ptr %30, align 1, !tbaa !9
  br label %31

31:                                               ; preds = %27
  %32 = load i32, ptr %2, align 4, !tbaa !5
  %33 = add nsw i32 %32, 1
  store i32 %33, ptr %2, align 4, !tbaa !5
  br label %22, !llvm.loop !15

34:                                               ; preds = %26
  br label %35

35:                                               ; preds = %53, %34
  %36 = call noundef zeroext i1 @_ZNKSt5stackIiSt5dequeIiSaIiEEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80) @S)
  %37 = xor i1 %36, true
  br i1 %37, label %38, label %54

38:                                               ; preds = %35
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #4
  %39 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt5stackIiSt5dequeIiSaIiEEE3topEv(ptr noundef nonnull align 8 dereferenceable(80) @S)
  %40 = load i32, ptr %39, align 4, !tbaa !5
  store i32 %40, ptr %3, align 4, !tbaa !5
  call void @_ZNSt5stackIiSt5dequeIiSaIiEEE3popEv(ptr noundef nonnull align 8 dereferenceable(80) @S)
  %41 = load i32, ptr %3, align 4, !tbaa !5
  %42 = sext i32 %41 to i64
  %43 = getelementptr inbounds [20001 x i8], ptr @visited, i64 0, i64 %42
  %44 = load i8, ptr %43, align 1, !tbaa !9, !range !11, !noundef !12
  %45 = trunc i8 %44 to i1
  br i1 %45, label %53, label %46

46:                                               ; preds = %38
  %47 = load i32, ptr @numComponents, align 4, !tbaa !5
  %48 = call i32 (ptr, ...) @printf(ptr noundef @.str.5, i32 noundef %47)
  %49 = load i32, ptr %3, align 4, !tbaa !5
  call void @_Z14kosaraju_dfs_2i(i32 noundef %49)
  %50 = load i32, ptr @numComponents, align 4, !tbaa !5
  %51 = add nsw i32 %50, 1
  store i32 %51, ptr @numComponents, align 4, !tbaa !5
  %52 = call i32 (ptr, ...) @printf(ptr noundef @.str.6)
  br label %53

53:                                               ; preds = %46, %38
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #4
  br label %35, !llvm.loop !16

54:                                               ; preds = %35
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNKSt5stackIiSt5dequeIiSaIiEEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80)) #3 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt5stackIiSt5dequeIiSaIiEEE3topEv(ptr noundef nonnull align 8 dereferenceable(80)) #3 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt5stackIiSt5dequeIiSaIiEEE3popEv(ptr noundef nonnull align 8 dereferenceable(80)) #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 willreturn memory(argmem: readwrite) }
attributes #2 = { "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 = { 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, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = !{i8 0, i8 2}
!12 = !{}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = distinct !{!15, !14}
!16 = distinct !{!16, !14}


; 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::stack" = type { %"class.std::deque" }
%"class.std::deque" = type { %"class.std::_Deque_base" }
%"class.std::_Deque_base" = type { %"struct.std::_Deque_base<int, std::allocator<int>>::_Deque_impl" }
%"struct.std::_Deque_base<int, std::allocator<int>>::_Deque_impl" = type { %"struct.std::_Deque_base<int, std::allocator<int>>::_Deque_impl_data" }
%"struct.std::_Deque_base<int, std::allocator<int>>::_Deque_impl_data" = type { ptr, i64, %"struct.std::_Deque_iterator", %"struct.std::_Deque_iterator" }
%"struct.std::_Deque_iterator" = type { ptr, ptr, ptr, ptr }

@n = external dso_local local_unnamed_addr global i32, align 4
@S = external dso_local global %"class.std::stack", align 8
@visited = external dso_local local_unnamed_addr global [20001 x i8], align 16
@numComponents = external dso_local local_unnamed_addr global i32, align 4
@.str.5 = external hidden unnamed_addr constant [15 x i8], align 1
@.str.6 = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z14kosaraju_dfs_1i(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z14kosaraju_dfs_2i(i32 noundef) local_unnamed_addr #0

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z8Kosarajuv() local_unnamed_addr #0 {
  %1 = load i32, ptr @n, align 4, !tbaa !5
  %2 = icmp sgt i32 %1, 0
  br i1 %2, label %.lr.ph, label %.preheader

.preheader10:                                     ; preds = %11
  %3 = icmp sgt i32 %12, 0
  br i1 %3, label %.lr.ph13.preheader, label %.preheader

.lr.ph13.preheader:                               ; preds = %.preheader10
  %4 = zext nneg i32 %12 to i64
  tail call void @llvm.memset.p0.i64(ptr nonnull align 16 @visited, i8 0, i64 %4, i1 false), !tbaa !9
  br label %.preheader

.lr.ph:                                           ; preds = %0, %11
  %5 = phi i32 [ %12, %11 ], [ %1, %0 ]
  %indvars.iv = phi i64 [ %indvars.iv.next, %11 ], [ 0, %0 ]
  %6 = getelementptr inbounds [20001 x i8], ptr @visited, i64 0, i64 %indvars.iv
  %7 = load i8, ptr %6, align 1, !tbaa !9, !range !11, !noundef !12
  %8 = trunc nuw i8 %7 to i1
  br i1 %8, label %11, label %9

9:                                                ; preds = %.lr.ph
  %10 = trunc nuw nsw i64 %indvars.iv to i32
  tail call void @_Z14kosaraju_dfs_1i(i32 noundef %10)
  %.pre = load i32, ptr @n, align 4, !tbaa !5
  br label %11

11:                                               ; preds = %.lr.ph, %9
  %12 = phi i32 [ %5, %.lr.ph ], [ %.pre, %9 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %13 = sext i32 %12 to i64
  %14 = icmp slt i64 %indvars.iv.next, %13
  br i1 %14, label %.lr.ph, label %.preheader10, !llvm.loop !13

.preheader:                                       ; preds = %0, %.lr.ph13.preheader, %.preheader10
  %15 = tail call noundef zeroext i1 @_ZNKSt5stackIiSt5dequeIiSaIiEEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80) @S)
  br i1 %15, label %._crit_edge, label %.lr.ph14

.lr.ph14:                                         ; preds = %.preheader, %28
  %16 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt5stackIiSt5dequeIiSaIiEEE3topEv(ptr noundef nonnull align 8 dereferenceable(80) @S)
  %17 = load i32, ptr %16, align 4, !tbaa !5
  tail call void @_ZNSt5stackIiSt5dequeIiSaIiEEE3popEv(ptr noundef nonnull align 8 dereferenceable(80) @S)
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [20001 x i8], ptr @visited, i64 0, i64 %18
  %20 = load i8, ptr %19, align 1, !tbaa !9, !range !11, !noundef !12
  %21 = trunc nuw i8 %20 to i1
  br i1 %21, label %28, label %22

22:                                               ; preds = %.lr.ph14
  %23 = load i32, ptr @numComponents, align 4, !tbaa !5
  %24 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.5, i32 noundef %23)
  tail call void @_Z14kosaraju_dfs_2i(i32 noundef %17)
  %25 = load i32, ptr @numComponents, align 4, !tbaa !5
  %26 = add nsw i32 %25, 1
  store i32 %26, ptr @numComponents, align 4, !tbaa !5
  %27 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.6)
  br label %28

28:                                               ; preds = %22, %.lr.ph14
  %29 = tail call noundef zeroext i1 @_ZNKSt5stackIiSt5dequeIiSaIiEEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80) @S)
  br i1 %29, label %._crit_edge, label %.lr.ph14, !llvm.loop !15

._crit_edge:                                      ; preds = %28, %.preheader
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNKSt5stackIiSt5dequeIiSaIiEEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt5stackIiSt5dequeIiSaIiEEE3topEv(ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt5stackIiSt5dequeIiSaIiEEE3popEv(ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #2 align 2

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #3

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 = { nofree nounwind "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 = { nocallback nofree nounwind willreturn memory(argmem: write) }

!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, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = !{i8 0, i8 2}
!12 = !{}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = distinct !{!15, !14}


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