; LLVM IR from AdarshGaur/Competitive-Programming :: Codeforces/Codeforces Round #773 (Div. 2)/A. Hard Way.ll (Z5solvev)

; 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::basic_istream" = type { ptr, i64, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"struct.std::pair" = type { i64, i64 }

@_ZSt3cin = external global %"class.std::basic_istream", align 8
@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z5solvev() #0 {
  %1 = alloca i64, align 8
  %2 = alloca ptr, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %1) #7
  store i64 3, ptr %1, align 8, !tbaa !5
  %5 = load i64, ptr %1, align 8, !tbaa !5
  %6 = call ptr @llvm.stacksave.p0()
  store ptr %6, ptr %2, align 8
  %7 = alloca %"struct.std::pair", i64 %5, align 16
  store i64 %5, ptr %3, align 8
  %8 = icmp eq i64 %5, 0
  br i1 %8, label %15, label %9

9:                                                ; preds = %0
  %10 = getelementptr inbounds %"struct.std::pair", ptr %7, i64 %5
  br label %11

11:                                               ; preds = %11, %9
  %12 = phi ptr [ %7, %9 ], [ %13, %11 ]
  call void @_ZNSt4pairIllEC2IllTnNSt9enable_ifIXsr6__and_ISt37__is_implicitly_default_constructibleIT_ES3_IT0_EEE5valueEbE4typeELb1EEEv(ptr noundef nonnull align 8 dereferenceable(16) %12)
  %13 = getelementptr inbounds %"struct.std::pair", ptr %12, i64 1
  %14 = icmp eq ptr %13, %10
  br i1 %14, label %15, label %11

15:                                               ; preds = %11, %0
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #7
  store i64 0, ptr %4, align 8, !tbaa !5
  br label %16

16:                                               ; preds = %29, %15
  %17 = load i64, ptr %4, align 8, !tbaa !5
  %18 = icmp slt i64 %17, 3
  br i1 %18, label %20, label %19

19:                                               ; preds = %16
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #7
  br label %32

20:                                               ; preds = %16
  %21 = load i64, ptr %4, align 8, !tbaa !5
  %22 = getelementptr inbounds %"struct.std::pair", ptr %7, i64 %21
  %23 = getelementptr inbounds %"struct.std::pair", ptr %22, i32 0, i32 1
  %24 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERl(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 8 dereferenceable(8) %23)
  %25 = load i64, ptr %4, align 8, !tbaa !5
  %26 = getelementptr inbounds %"struct.std::pair", ptr %7, i64 %25
  %27 = getelementptr inbounds %"struct.std::pair", ptr %26, i32 0, i32 0
  %28 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERl(ptr noundef nonnull align 8 dereferenceable(16) %24, ptr noundef nonnull align 8 dereferenceable(8) %27)
  br label %29

29:                                               ; preds = %20
  %30 = load i64, ptr %4, align 8, !tbaa !5
  %31 = add nsw i64 %30, 1
  store i64 %31, ptr %4, align 8, !tbaa !5
  br label %16, !llvm.loop !9

32:                                               ; preds = %19
  %33 = load i64, ptr %1, align 8, !tbaa !5
  %34 = getelementptr inbounds %"struct.std::pair", ptr %7, i64 %33
  call void @_ZSt4sortIPSt4pairIllEEvT_S3_(ptr noundef %7, ptr noundef %34)
  %35 = getelementptr inbounds %"struct.std::pair", ptr %7, i64 2
  %36 = getelementptr inbounds %"struct.std::pair", ptr %35, i32 0, i32 0
  %37 = load i64, ptr %36, align 16, !tbaa !11
  %38 = getelementptr inbounds %"struct.std::pair", ptr %7, i64 1
  %39 = getelementptr inbounds %"struct.std::pair", ptr %38, i32 0, i32 0
  %40 = load i64, ptr %39, align 16, !tbaa !11
  %41 = icmp eq i64 %37, %40
  br i1 %41, label %42, label %53

42:                                               ; preds = %32
  %43 = getelementptr inbounds %"struct.std::pair", ptr %7, i64 2
  %44 = getelementptr inbounds %"struct.std::pair", ptr %43, i32 0, i32 1
  %45 = load i64, ptr %44, align 8, !tbaa !13
  %46 = getelementptr inbounds %"struct.std::pair", ptr %7, i64 1
  %47 = getelementptr inbounds %"struct.std::pair", ptr %46, i32 0, i32 1
  %48 = load i64, ptr %47, align 8, !tbaa !13
  %49 = sub nsw i64 %45, %48
  %50 = call noundef i64 @_ZSt3absl(i64 noundef %49)
  %51 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEl(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i64 noundef %50)
  %52 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) %51, ptr noundef @.str)
  br label %56

53:                                               ; preds = %32
  %54 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef 0)
  %55 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) %54, ptr noundef @.str)
  br label %56

56:                                               ; preds = %53, %42
  %57 = load ptr, ptr %2, align 8
  call void @llvm.stackrestore.p0(ptr %57)
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #7
  ret void
}

; 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
declare ptr @llvm.stacksave.p0() #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt4pairIllEC2IllTnNSt9enable_ifIXsr6__and_ISt37__is_implicitly_default_constructibleIT_ES3_IT0_EEE5valueEbE4typeELb1EEEv(ptr noundef nonnull align 8 dereferenceable(16)) unnamed_addr #3 align 2

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERl(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 8 dereferenceable(8)) #0 align 2

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

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4sortIPSt4pairIllEEvT_S3_(ptr noundef, ptr noundef) #4

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) #4

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEl(ptr noundef nonnull align 8 dereferenceable(8), i64 noundef) #0 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZSt3absl(i64 noundef) #5

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #6

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #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 = { nocallback nofree nosync nounwind willreturn }
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 = { inlinehint 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 #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 = { "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 #7 = { 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 = !{!"long", !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 0}
!12 = !{!"_ZTSSt4pairIllE", !6, i64 0, !6, i64 8}
!13 = !{!12, !6, i64 8}


; 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::basic_istream" = type { ptr, i64, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"struct.std::pair" = type { i64, i64 }

@_ZSt3cin = external global %"class.std::basic_istream", align 8
@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z5solvev() local_unnamed_addr #0 {
.preheader.preheader:
  %0 = alloca [3 x %"struct.std::pair"], align 16
  call void @_ZNSt4pairIllEC2IllTnNSt9enable_ifIXsr6__and_ISt37__is_implicitly_default_constructibleIT_ES3_IT0_EEE5valueEbE4typeELb1EEEv(ptr noundef nonnull align 8 dereferenceable(16) %0)
  %.ptr.1 = getelementptr inbounds i8, ptr %0, i64 16
  call void @_ZNSt4pairIllEC2IllTnNSt9enable_ifIXsr6__and_ISt37__is_implicitly_default_constructibleIT_ES3_IT0_EEE5valueEbE4typeELb1EEEv(ptr noundef nonnull align 8 dereferenceable(16) %.ptr.1)
  %.ptr.2 = getelementptr inbounds i8, ptr %0, i64 32
  call void @_ZNSt4pairIllEC2IllTnNSt9enable_ifIXsr6__and_ISt37__is_implicitly_default_constructibleIT_ES3_IT0_EEE5valueEbE4typeELb1EEEv(ptr noundef nonnull align 8 dereferenceable(16) %.ptr.2)
  %1 = getelementptr inbounds i8, ptr %0, i64 8
  %2 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERl(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 8 dereferenceable(8) %1)
  %3 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERl(ptr noundef nonnull align 8 dereferenceable(16) %2, ptr noundef nonnull align 8 dereferenceable(8) %0)
  %4 = getelementptr inbounds i8, ptr %0, i64 24
  %5 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERl(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 8 dereferenceable(8) %4)
  %6 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERl(ptr noundef nonnull align 8 dereferenceable(16) %5, ptr noundef nonnull align 8 dereferenceable(8) %.ptr.1)
  %7 = getelementptr inbounds i8, ptr %0, i64 40
  %8 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERl(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 8 dereferenceable(8) %7)
  %9 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERl(ptr noundef nonnull align 8 dereferenceable(16) %8, ptr noundef nonnull align 8 dereferenceable(8) %.ptr.2)
  %10 = getelementptr inbounds i8, ptr %0, i64 48
  call void @_ZSt4sortIPSt4pairIllEEvT_S3_(ptr noundef nonnull %0, ptr noundef nonnull %10)
  %11 = load i64, ptr %.ptr.2, align 16, !tbaa !5
  %12 = load i64, ptr %.ptr.1, align 16, !tbaa !5
  %13 = icmp eq i64 %11, %12
  br i1 %13, label %14, label %22

14:                                               ; preds = %.preheader.preheader
  %15 = getelementptr inbounds i8, ptr %0, i64 40
  %16 = load i64, ptr %15, align 8, !tbaa !10
  %17 = getelementptr inbounds i8, ptr %0, i64 24
  %18 = load i64, ptr %17, align 8, !tbaa !10
  %19 = sub nsw i64 %16, %18
  %20 = call noundef i64 @_ZSt3absl(i64 noundef %19)
  %21 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEl(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i64 noundef %20)
  br label %24

22:                                               ; preds = %.preheader.preheader
  %23 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef 0)
  br label %24

24:                                               ; preds = %22, %14
  %.sink = phi ptr [ %23, %22 ], [ %21, %14 ]
  %25 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) %.sink, ptr noundef nonnull @.str)
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt4pairIllEC2IllTnNSt9enable_ifIXsr6__and_ISt37__is_implicitly_default_constructibleIT_ES3_IT0_EEE5valueEbE4typeELb1EEEv(ptr noundef nonnull align 8 dereferenceable(16)) unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERl(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #0 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4sortIPSt4pairIllEEvT_S3_(ptr noundef, ptr noundef) local_unnamed_addr #2

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) local_unnamed_addr #2

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEl(ptr noundef nonnull align 8 dereferenceable(8), i64 noundef) local_unnamed_addr #0 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZSt3absl(i64 noundef) local_unnamed_addr #3

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) local_unnamed_addr #4

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 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 #2 = { inlinehint 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 #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 = { "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" }

!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 = !{!"_ZTSSt4pairIllE", !7, i64 0, !7, i64 8}
!7 = !{!"long", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!6, !7, i64 8}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,LoopSimplifyPass,SROAPass,SimplifyCFGPass