; LLVM IR from tangjz/acm-icpc :: leetcode/extra/Pony.ai_004-谁挡住了我的红绿灯 (main)

; 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<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Deque_impl" }
%"struct.std::_Deque_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Deque_impl" = type { %"struct.std::_Deque_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Deque_impl_data" }
%"struct.std::_Deque_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Deque_impl_data" = type { ptr, i64, %"struct.std::_Deque_iterator", %"struct.std::_Deque_iterator" }
%"struct.std::_Deque_iterator" = type { ptr, ptr, ptr, ptr }
%"struct.std::pair" = type { i32, i32 }

@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_Z3cmpRKSt4pairIiiES2_(ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(8)) #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #1 personality ptr @__gxx_personality_v0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca %"class.std::stack", align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca %"struct.std::pair", align 4
  %10 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #6
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #6
  call void @llvm.lifetime.start.p0(i64 80, ptr %4) #6
  call void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEEC2IS4_vEEv(ptr noundef nonnull align 8 dereferenceable(80) %4)
  %11 = invoke i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %2, ptr noundef %3)
          to label %12 unwind label %18

12:                                               ; preds = %0
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #6
  store i32 1, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #6
  br label %13

13:                                               ; preds = %68, %12
  %14 = load i32, ptr %7, align 4, !tbaa !5
  %15 = load i32, ptr %2, align 4, !tbaa !5
  %16 = icmp sle i32 %14, %15
  br i1 %16, label %22, label %17

17:                                               ; preds = %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #6
  br label %73

18:                                               ; preds = %0
  %19 = landingpad { ptr, i32 }
          cleanup
  %20 = extractvalue { ptr, i32 } %19, 0
  store ptr %20, ptr %5, align 8
  %21 = extractvalue { ptr, i32 } %19, 1
  store i32 %21, ptr %6, align 4
  br label %75

22:                                               ; preds = %13
  %23 = invoke i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef %8)
          to label %24 unwind label %42

24:                                               ; preds = %22
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #6
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #6
  %25 = load i32, ptr %8, align 4, !tbaa !5
  %26 = load i32, ptr %3, align 4, !tbaa !5
  %27 = sub nsw i32 %25, %26
  store i32 %27, ptr %10, align 4, !tbaa !5
  invoke void @_ZNSt4pairIiiEC2IiRiTnNSt9enable_ifIXaaclsr5_PCCPE22_MoveConstructiblePairIT_T0_EEclsr5_PCCPE30_ImplicitlyMoveConvertiblePairIS4_S5_EEEbE4typeELb1EEEOS4_OS5_(ptr noundef nonnull align 4 dereferenceable(8) %9, ptr noundef nonnull align 4 dereferenceable(4) %10, ptr noundef nonnull align 4 dereferenceable(4) %7)
          to label %28 unwind label %46

28:                                               ; preds = %24
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #6
  br label %29

29:                                               ; preds = %41, %28
  %30 = invoke noundef zeroext i1 @_ZNKSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80) %4)
          to label %31 unwind label %50

31:                                               ; preds = %29
  br i1 %30, label %37, label %32

32:                                               ; preds = %31
  %33 = invoke noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE3topEv(ptr noundef nonnull align 8 dereferenceable(80) %4)
          to label %34 unwind label %50

34:                                               ; preds = %32
  %35 = call noundef i64 @_Z3cmpRKSt4pairIiiES2_(ptr noundef nonnull align 4 dereferenceable(8) %33, ptr noundef nonnull align 4 dereferenceable(8) %9)
  %36 = icmp slt i64 %35, 0
  br label %37

37:                                               ; preds = %34, %31
  %38 = phi i1 [ false, %31 ], [ %36, %34 ]
  br i1 %38, label %39, label %54

39:                                               ; preds = %37
  br label %40

40:                                               ; preds = %39
  invoke void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE3popEv(ptr noundef nonnull align 8 dereferenceable(80) %4)
          to label %41 unwind label %50

41:                                               ; preds = %40
  br label %29, !llvm.loop !9

42:                                               ; preds = %22
  %43 = landingpad { ptr, i32 }
          cleanup
  %44 = extractvalue { ptr, i32 } %43, 0
  store ptr %44, ptr %5, align 8
  %45 = extractvalue { ptr, i32 } %43, 1
  store i32 %45, ptr %6, align 4
  br label %72

46:                                               ; preds = %24
  %47 = landingpad { ptr, i32 }
          cleanup
  %48 = extractvalue { ptr, i32 } %47, 0
  store ptr %48, ptr %5, align 8
  %49 = extractvalue { ptr, i32 } %47, 1
  store i32 %49, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #6
  br label %71

50:                                               ; preds = %66, %63, %58, %54, %40, %32, %29
  %51 = landingpad { ptr, i32 }
          cleanup
  %52 = extractvalue { ptr, i32 } %51, 0
  store ptr %52, ptr %5, align 8
  %53 = extractvalue { ptr, i32 } %51, 1
  store i32 %53, ptr %6, align 4
  br label %71

54:                                               ; preds = %37
  %55 = invoke noundef zeroext i1 @_ZNKSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80) %4)
          to label %56 unwind label %50

56:                                               ; preds = %54
  br i1 %55, label %57, label %58

57:                                               ; preds = %56
  br label %63

58:                                               ; preds = %56
  %59 = invoke noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE3topEv(ptr noundef nonnull align 8 dereferenceable(80) %4)
          to label %60 unwind label %50

60:                                               ; preds = %58
  %61 = getelementptr inbounds %"struct.std::pair", ptr %59, i32 0, i32 1
  %62 = load i32, ptr %61, align 4, !tbaa !11
  br label %63

63:                                               ; preds = %60, %57
  %64 = phi i32 [ 0, %57 ], [ %62, %60 ]
  %65 = invoke i32 (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %64)
          to label %66 unwind label %50

66:                                               ; preds = %63
  invoke void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80) %4, ptr noundef nonnull align 4 dereferenceable(8) %9)
          to label %67 unwind label %50

67:                                               ; preds = %66
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #6
  br label %68

68:                                               ; preds = %67
  %69 = load i32, ptr %7, align 4, !tbaa !5
  %70 = add nsw i32 %69, 1
  store i32 %70, ptr %7, align 4, !tbaa !5
  br label %13, !llvm.loop !13

71:                                               ; preds = %50, %46
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #6
  br label %72

72:                                               ; preds = %71, %42
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #6
  br label %75

73:                                               ; preds = %17
  store i32 0, ptr %1, align 4
  call void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80) %4) #6
  call void @llvm.lifetime.end.p0(i64 80, ptr %4) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #6
  %74 = load i32, ptr %1, align 4
  ret i32 %74

75:                                               ; preds = %72, %18
  call void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80) %4) #6
  call void @llvm.lifetime.end.p0(i64 80, ptr %4) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #6
  br label %76

76:                                               ; preds = %75
  %77 = load ptr, ptr %5, align 8
  %78 = load i32, ptr %6, align 4
  %79 = insertvalue { ptr, i32 } poison, ptr %77, 0
  %80 = insertvalue { ptr, i32 } %79, i32 %78, 1
  resume { ptr, i32 } %80
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEEC2IS4_vEEv(ptr noundef nonnull align 8 dereferenceable(80)) unnamed_addr #3 align 2

declare i32 @__isoc99_scanf(ptr noundef, ...) #4

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt4pairIiiEC2IiRiTnNSt9enable_ifIXaaclsr5_PCCPE22_MoveConstructiblePairIT_T0_EEclsr5_PCCPE30_ImplicitlyMoveConvertiblePairIS4_S5_EEEbE4typeELb1EEEOS4_OS5_(ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) unnamed_addr #0 align 2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNKSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80)) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE3topEv(ptr noundef nonnull align 8 dereferenceable(80)) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE3popEv(ptr noundef nonnull align 8 dereferenceable(80)) #0 align 2

declare i32 @printf(ptr noundef, ...) #4

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80), ptr noundef nonnull align 4 dereferenceable(8)) #3 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80)) unnamed_addr #5 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 = { mustprogress norecurse 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 #4 = { "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 #5 = { 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 #6 = { 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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!12, !6, i64 4}
!12 = !{!"_ZTSSt4pairIiiE", !6, i64 0, !6, i64 4}
!13 = distinct !{!13, !10}


; 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<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Deque_impl" }
%"struct.std::_Deque_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Deque_impl" = type { %"struct.std::_Deque_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Deque_impl_data" }
%"struct.std::_Deque_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Deque_impl_data" = type { ptr, i64, %"struct.std::_Deque_iterator", %"struct.std::_Deque_iterator" }
%"struct.std::_Deque_iterator" = type { ptr, ptr, ptr, ptr }
%"struct.std::pair" = type { i32, i32 }

@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_Z3cmpRKSt4pairIiiES2_(ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(8)) local_unnamed_addr #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #1 personality ptr @__gxx_personality_v0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca %"class.std::stack", align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca %"struct.std::pair", align 4
  %7 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #6
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #6
  call void @llvm.lifetime.start.p0(i64 80, ptr nonnull %3) #6
  call void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEEC2IS4_vEEv(ptr noundef nonnull align 8 dereferenceable(80) %3)
  %8 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1, ptr noundef nonnull %2)
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #6
  store i32 1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %5) #6
  %9 = load i32, ptr %1, align 4, !tbaa !5
  %.not3 = icmp slt i32 %9, 1
  br i1 %.not3, label %._crit_edge, label %.lr.ph4

._crit_edge:                                      ; preds = %30, %0
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %5) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #6
  call void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80) %3) #6
  call void @llvm.lifetime.end.p0(i64 80, ptr nonnull %3) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #6
  ret i32 0

.lr.ph4:                                          ; preds = %0, %30
  %10 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull %5)
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %6) #6
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %7) #6
  %11 = load i32, ptr %5, align 4, !tbaa !5
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = sub nsw i32 %11, %12
  store i32 %13, ptr %7, align 4, !tbaa !5
  call void @_ZNSt4pairIiiEC2IiRiTnNSt9enable_ifIXaaclsr5_PCCPE22_MoveConstructiblePairIT_T0_EEclsr5_PCCPE30_ImplicitlyMoveConvertiblePairIS4_S5_EEEbE4typeELb1EEEOS4_OS5_(ptr noundef nonnull align 4 dereferenceable(8) %6, ptr noundef nonnull align 4 dereferenceable(4) %7, ptr noundef nonnull align 4 dereferenceable(4) %4)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %7) #6
  %14 = call noundef zeroext i1 @_ZNKSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80) %3)
  br i1 %14, label %.critedge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph4, %18
  %15 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE3topEv(ptr noundef nonnull align 8 dereferenceable(80) %3)
  %16 = call noundef i64 @_Z3cmpRKSt4pairIiiES2_(ptr noundef nonnull align 4 dereferenceable(8) %15, ptr noundef nonnull align 4 dereferenceable(8) %6)
  %17 = icmp slt i64 %16, 0
  br i1 %17, label %18, label %.critedge

18:                                               ; preds = %.lr.ph
  call void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE3popEv(ptr noundef nonnull align 8 dereferenceable(80) %3)
  %19 = call noundef zeroext i1 @_ZNKSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80) %3)
  br i1 %19, label %.critedge, label %.lr.ph, !llvm.loop !9

20:                                               ; preds = %27
  %21 = landingpad { ptr, i32 }
          cleanup
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %6) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %5) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #6
  call void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80) %3) #6
  call void @llvm.lifetime.end.p0(i64 80, ptr nonnull %3) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #6
  resume { ptr, i32 } %21

.critedge:                                        ; preds = %.lr.ph, %18, %.lr.ph4
  %22 = call noundef zeroext i1 @_ZNKSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80) %3)
  br i1 %22, label %27, label %23

23:                                               ; preds = %.critedge
  %24 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE3topEv(ptr noundef nonnull align 8 dereferenceable(80) %3)
  %25 = getelementptr inbounds i8, ptr %24, i64 4
  %26 = load i32, ptr %25, align 4, !tbaa !11
  br label %27

27:                                               ; preds = %.critedge, %23
  %28 = phi i32 [ %26, %23 ], [ 0, %.critedge ]
  %29 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i32 noundef %28)
  invoke void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80) %3, ptr noundef nonnull align 4 dereferenceable(8) %6)
          to label %30 unwind label %20

30:                                               ; preds = %27
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %6) #6
  %31 = load i32, ptr %4, align 4, !tbaa !5
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %4, align 4, !tbaa !5
  %33 = load i32, ptr %1, align 4, !tbaa !5
  %.not.not = icmp slt i32 %31, %33
  br i1 %.not.not, label %.lr.ph4, label %._crit_edge, !llvm.loop !13
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEEC2IS4_vEEv(ptr noundef nonnull align 8 dereferenceable(80)) unnamed_addr #3 align 2

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #4

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt4pairIiiEC2IiRiTnNSt9enable_ifIXaaclsr5_PCCPE22_MoveConstructiblePairIT_T0_EEclsr5_PCCPE30_ImplicitlyMoveConvertiblePairIS4_S5_EEEbE4typeELb1EEEOS4_OS5_(ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) unnamed_addr #0 align 2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNKSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE3topEv(ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE3popEv(ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #0 align 2

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #4

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80), ptr noundef nonnull align 4 dereferenceable(8)) local_unnamed_addr #3 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZNSt5stackISt4pairIiiESt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80)) unnamed_addr #5 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 = { mustprogress norecurse 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 nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 #4 = { 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 #5 = { 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 #6 = { 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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!12, !6, i64 4}
!12 = !{!"_ZTSSt4pairIiiE", !6, i64 0, !6, i64 4}
!13 = distinct !{!13, !10}


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