; LLVM IR from eyangch/competitive-programming :: USACOcontests/silver/2018.01/mootube.ll (Z3dfsiPSt6vectorISt4pairIiiESaIS1_EEii)

; 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::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Vector_impl" }
%"struct.std::_Vector_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Vector_impl" = type { %"struct.std::_Vector_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Vector_impl_data" }
%"struct.std::_Vector_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%"struct.std::pair" = type { i32, i32 }

@visited = external dso_local global [5000 x i8], align 16

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z3dfsiPSt6vectorISt4pairIiiESaIS1_EEii(i32 noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3) #0 {
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store i32 %0, ptr %6, align 4, !tbaa !5
  store ptr %1, ptr %7, align 8, !tbaa !9
  store i32 %2, ptr %8, align 4, !tbaa !5
  store i32 %3, ptr %9, align 4, !tbaa !5
  %12 = load i32, ptr %9, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [5000 x i8], ptr @visited, i64 0, i64 %13
  %15 = load i8, ptr %14, align 1, !tbaa !11, !range !13, !noundef !14
  %16 = trunc i8 %15 to i1
  br i1 %16, label %17, label %18

17:                                               ; preds = %4
  store i32 0, ptr %5, align 4
  br label %66

18:                                               ; preds = %4
  %19 = load i32, ptr %9, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [5000 x i8], ptr @visited, i64 0, i64 %20
  store i8 1, ptr %21, align 1, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  store i32 1, ptr %10, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #3
  store i32 0, ptr %11, align 4, !tbaa !5
  br label %22

22:                                               ; preds = %61, %18
  %23 = load i32, ptr %11, align 4, !tbaa !5
  %24 = load ptr, ptr %7, align 8, !tbaa !9
  %25 = load i32, ptr %9, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds %"class.std::vector", ptr %24, i64 %26
  %28 = call noundef i64 @_ZNKSt6vectorISt4pairIiiESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %27) #3
  %29 = trunc i64 %28 to i32
  %30 = icmp slt i32 %23, %29
  br i1 %30, label %32, label %31

31:                                               ; preds = %22
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #3
  br label %64

32:                                               ; preds = %22
  %33 = load ptr, ptr %7, align 8, !tbaa !9
  %34 = load i32, ptr %9, align 4, !tbaa !5
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds %"class.std::vector", ptr %33, i64 %35
  %37 = load i32, ptr %11, align 4, !tbaa !5
  %38 = sext i32 %37 to i64
  %39 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %36, i64 noundef %38) #3
  %40 = getelementptr inbounds %"struct.std::pair", ptr %39, i32 0, i32 1
  %41 = load i32, ptr %40, align 4, !tbaa !15
  %42 = load i32, ptr %8, align 4, !tbaa !5
  %43 = icmp slt i32 %41, %42
  br i1 %43, label %44, label %45

44:                                               ; preds = %32
  br label %61

45:                                               ; preds = %32
  %46 = load i32, ptr %6, align 4, !tbaa !5
  %47 = load ptr, ptr %7, align 8, !tbaa !9
  %48 = load i32, ptr %8, align 4, !tbaa !5
  %49 = load ptr, ptr %7, align 8, !tbaa !9
  %50 = load i32, ptr %9, align 4, !tbaa !5
  %51 = sext i32 %50 to i64
  %52 = getelementptr inbounds %"class.std::vector", ptr %49, i64 %51
  %53 = load i32, ptr %11, align 4, !tbaa !5
  %54 = sext i32 %53 to i64
  %55 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %52, i64 noundef %54) #3
  %56 = getelementptr inbounds %"struct.std::pair", ptr %55, i32 0, i32 0
  %57 = load i32, ptr %56, align 4, !tbaa !17
  %58 = call noundef i32 @_Z3dfsiPSt6vectorISt4pairIiiESaIS1_EEii(i32 noundef %46, ptr noundef %47, i32 noundef %48, i32 noundef %57)
  %59 = load i32, ptr %10, align 4, !tbaa !5
  %60 = add nsw i32 %59, %58
  store i32 %60, ptr %10, align 4, !tbaa !5
  br label %61

61:                                               ; preds = %45, %44
  %62 = load i32, ptr %11, align 4, !tbaa !5
  %63 = add nsw i32 %62, 1
  store i32 %63, ptr %11, align 4, !tbaa !5
  br label %22, !llvm.loop !18

64:                                               ; preds = %31
  %65 = load i32, ptr %10, align 4, !tbaa !5
  store i32 %65, ptr %5, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  br label %66

66:                                               ; preds = %64, %17
  %67 = load i32, ptr %5, align 4
  ret i32 %67
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorISt4pairIiiESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #2 align 2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"bool", !7, i64 0}
!13 = !{i8 0, i8 2}
!14 = !{}
!15 = !{!16, !6, i64 4}
!16 = !{!"_ZTSSt4pairIiiE", !6, i64 0, !6, i64 4}
!17 = !{!16, !6, i64 0}
!18 = distinct !{!18, !19}
!19 = !{!"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::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Vector_impl" }
%"struct.std::_Vector_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Vector_impl" = type { %"struct.std::_Vector_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Vector_impl_data" }
%"struct.std::_Vector_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Vector_impl_data" = type { ptr, ptr, ptr }

@visited = external dso_local local_unnamed_addr global [5000 x i8], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z3dfsiPSt6vectorISt4pairIiiESaIS1_EEii(i32 noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = sext i32 %3 to i64
  %6 = getelementptr inbounds [5000 x i8], ptr @visited, i64 0, i64 %5
  %7 = load i8, ptr %6, align 1, !tbaa !5, !range !9, !noundef !10
  %8 = trunc nuw i8 %7 to i1
  br i1 %8, label %.loopexit, label %9

9:                                                ; preds = %4
  store i8 1, ptr %6, align 1, !tbaa !5
  %10 = getelementptr inbounds %"class.std::vector", ptr %1, i64 %5
  %11 = tail call noundef i64 @_ZNKSt6vectorISt4pairIiiESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %10) #1
  %12 = trunc i64 %11 to i32
  %13 = icmp sgt i32 %12, 0
  br i1 %13, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %9, %23
  %indvars.iv = phi i64 [ %indvars.iv.next, %23 ], [ 0, %9 ]
  %.01821 = phi i32 [ %.1, %23 ], [ 1, %9 ]
  %14 = tail call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %10, i64 noundef %indvars.iv) #1
  %15 = getelementptr inbounds i8, ptr %14, i64 4
  %16 = load i32, ptr %15, align 4, !tbaa !11
  %17 = icmp slt i32 %16, %2
  br i1 %17, label %23, label %18

18:                                               ; preds = %.lr.ph
  %19 = tail call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %10, i64 noundef %indvars.iv) #1
  %20 = load i32, ptr %19, align 4, !tbaa !14
  %21 = tail call noundef i32 @_Z3dfsiPSt6vectorISt4pairIiiESaIS1_EEii(i32 noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %20)
  %22 = add nsw i32 %21, %.01821
  br label %23

23:                                               ; preds = %.lr.ph, %18
  %.1 = phi i32 [ %.01821, %.lr.ph ], [ %22, %18 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %24 = tail call noundef i64 @_ZNKSt6vectorISt4pairIiiESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %10) #1
  %sext = shl i64 %24, 32
  %25 = ashr exact i64 %sext, 32
  %26 = icmp slt i64 %indvars.iv.next, %25
  br i1 %26, label %.lr.ph, label %.loopexit, !llvm.loop !15

.loopexit:                                        ; preds = %23, %9, %4
  %.019 = phi i32 [ 0, %4 ], [ 1, %9 ], [ %.1, %23 ]
  ret i32 %.019
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorISt4pairIiiESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #0 align 2

attributes #0 = { 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 #1 = { 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 = !{!"bool", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{i8 0, i8 2}
!10 = !{}
!11 = !{!12, !13, i64 4}
!12 = !{!"_ZTSSt4pairIiiE", !13, i64 0, !13, i64 4}
!13 = !{!"int", !7, i64 0}
!14 = !{!12, !13, i64 0}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}


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