; LLVM IR from seikhchilli/codeforces-solution :: Games (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::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" }

@_ZSt3cin = external global %"class.std::basic_istream", align 8
@_ZSt4cout = external global %"class.std::basic_ostream", align 8

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #4
  %10 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %2)
  %11 = load i32, ptr %2, align 4, !tbaa !5
  %12 = zext i32 %11 to i64
  %13 = call ptr @llvm.stacksave.p0()
  store ptr %13, ptr %3, align 8
  %14 = alloca [2 x i32], i64 %12, align 16
  store i64 %12, ptr %4, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #4
  store i32 0, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #4
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %15

15:                                               ; preds = %31, %0
  %16 = load i32, ptr %6, align 4, !tbaa !5
  %17 = load i32, ptr %2, align 4, !tbaa !5
  %18 = icmp slt i32 %16, %17
  br i1 %18, label %20, label %19

19:                                               ; preds = %15
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  br label %34

20:                                               ; preds = %15
  %21 = load i32, ptr %6, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [2 x i32], ptr %14, i64 %22
  %24 = getelementptr inbounds [2 x i32], ptr %23, i64 0, i64 0
  %25 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %24)
  %26 = load i32, ptr %6, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds [2 x i32], ptr %14, i64 %27
  %29 = getelementptr inbounds [2 x i32], ptr %28, i64 0, i64 1
  %30 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %25, ptr noundef nonnull align 4 dereferenceable(4) %29)
  br label %31

31:                                               ; preds = %20
  %32 = load i32, ptr %6, align 4, !tbaa !5
  %33 = add nsw i32 %32, 1
  store i32 %33, ptr %6, align 4, !tbaa !5
  br label %15, !llvm.loop !9

34:                                               ; preds = %19
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  store i32 0, ptr %7, align 4, !tbaa !5
  br label %35

35:                                               ; preds = %66, %34
  %36 = load i32, ptr %7, align 4, !tbaa !5
  %37 = load i32, ptr %2, align 4, !tbaa !5
  %38 = icmp slt i32 %36, %37
  br i1 %38, label %40, label %39

39:                                               ; preds = %35
  store i32 5, ptr %8, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  br label %69

40:                                               ; preds = %35
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #4
  store i32 0, ptr %9, align 4, !tbaa !5
  br label %41

41:                                               ; preds = %62, %40
  %42 = load i32, ptr %9, align 4, !tbaa !5
  %43 = load i32, ptr %2, align 4, !tbaa !5
  %44 = icmp slt i32 %42, %43
  br i1 %44, label %46, label %45

45:                                               ; preds = %41
  store i32 8, ptr %8, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #4
  br label %65

46:                                               ; preds = %41
  %47 = load i32, ptr %7, align 4, !tbaa !5
  %48 = sext i32 %47 to i64
  %49 = getelementptr inbounds [2 x i32], ptr %14, i64 %48
  %50 = getelementptr inbounds [2 x i32], ptr %49, i64 0, i64 1
  %51 = load i32, ptr %50, align 4, !tbaa !5
  %52 = load i32, ptr %9, align 4, !tbaa !5
  %53 = sext i32 %52 to i64
  %54 = getelementptr inbounds [2 x i32], ptr %14, i64 %53
  %55 = getelementptr inbounds [2 x i32], ptr %54, i64 0, i64 0
  %56 = load i32, ptr %55, align 8, !tbaa !5
  %57 = icmp eq i32 %51, %56
  br i1 %57, label %58, label %61

58:                                               ; preds = %46
  %59 = load i32, ptr %5, align 4, !tbaa !5
  %60 = add nsw i32 %59, 1
  store i32 %60, ptr %5, align 4, !tbaa !5
  br label %61

61:                                               ; preds = %58, %46
  br label %62

62:                                               ; preds = %61
  %63 = load i32, ptr %9, align 4, !tbaa !5
  %64 = add nsw i32 %63, 1
  store i32 %64, ptr %9, align 4, !tbaa !5
  br label %41, !llvm.loop !11

65:                                               ; preds = %45
  br label %66

66:                                               ; preds = %65
  %67 = load i32, ptr %7, align 4, !tbaa !5
  %68 = add nsw i32 %67, 1
  store i32 %68, ptr %7, align 4, !tbaa !5
  br label %35, !llvm.loop !12

69:                                               ; preds = %39
  %70 = load i32, ptr %5, align 4, !tbaa !5
  %71 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %70)
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  %72 = load ptr, ptr %3, align 8
  call void @llvm.stackrestore.p0(ptr %72)
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #4
  %73 = load i32, ptr %1, align 4
  ret i32 %73
}

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

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #3

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

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #3

attributes #0 = { 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 #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 = { nocallback nofree nosync nounwind willreturn }
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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}
!12 = distinct !{!12, !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::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" }

@_ZSt3cin = external global %"class.std::basic_istream", align 8
@_ZSt4cout = external global %"class.std::basic_ostream", align 8

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #5
  %2 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %1)
  %3 = load i32, ptr %1, align 4, !tbaa !5
  %4 = zext i32 %3 to i64
  %5 = call ptr @llvm.stacksave.p0()
  %6 = alloca [2 x i32], i64 %4, align 16
  %7 = load i32, ptr %1, align 4, !tbaa !5
  %8 = icmp sgt i32 %7, 0
  br i1 %8, label %.lr.ph, label %._crit_edge24

.preheader16:                                     ; preds = %.lr.ph
  %9 = icmp sgt i32 %34, 0
  br i1 %9, label %.preheader.us.preheader, label %._crit_edge24

.preheader.us.preheader:                          ; preds = %.preheader16
  %wide.trip.count34 = zext nneg i32 %34 to i64
  %min.iters.check = icmp ult i32 %34, 9
  %n.mod.vf = and i64 %wide.trip.count34, 7
  %10 = icmp eq i64 %n.mod.vf, 0
  %11 = select i1 %10, i64 8, i64 %n.mod.vf
  %n.vec = sub nsw i64 %wide.trip.count34, %11
  br label %.preheader.us

.preheader.us:                                    ; preds = %.preheader.us.preheader, %._crit_edge.us
  %indvars.iv31 = phi i64 [ 0, %.preheader.us.preheader ], [ %indvars.iv.next32, %._crit_edge.us ]
  %.01522.us = phi i32 [ 0, %.preheader.us.preheader ], [ %spec.select.us, %._crit_edge.us ]
  %12 = getelementptr inbounds [2 x i32], ptr %6, i64 %indvars.iv31, i64 1
  %13 = load i32, ptr %12, align 4, !tbaa !5
  br i1 %min.iters.check, label %scalar.ph.preheader, label %vector.ph

vector.ph:                                        ; preds = %.preheader.us
  %14 = insertelement <4 x i32> <i32 poison, i32 0, i32 0, i32 0>, i32 %.01522.us, i64 0
  %broadcast.splatinsert = insertelement <4 x i32> poison, i32 %13, i64 0
  %broadcast.splat = shufflevector <4 x i32> %broadcast.splatinsert, <4 x i32> poison, <4 x i32> zeroinitializer
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.phi = phi <4 x i32> [ %14, %vector.ph ], [ %22, %vector.body ]
  %vec.phi37 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %23, %vector.body ]
  %15 = or disjoint i64 %index, 4
  %16 = getelementptr inbounds [2 x i32], ptr %6, i64 %index
  %17 = getelementptr inbounds [2 x i32], ptr %6, i64 %15
  %wide.vec = load <8 x i32>, ptr %16, align 16, !tbaa !5
  %wide.vec38 = load <8 x i32>, ptr %17, align 16, !tbaa !5
  %strided.vec = shufflevector <8 x i32> %wide.vec, <8 x i32> poison, <4 x i32> <i32 0, i32 2, i32 4, i32 6>
  %strided.vec39 = shufflevector <8 x i32> %wide.vec38, <8 x i32> poison, <4 x i32> <i32 0, i32 2, i32 4, i32 6>
  %18 = icmp eq <4 x i32> %broadcast.splat, %strided.vec
  %19 = icmp eq <4 x i32> %broadcast.splat, %strided.vec39
  %20 = zext <4 x i1> %18 to <4 x i32>
  %21 = zext <4 x i1> %19 to <4 x i32>
  %22 = add <4 x i32> %vec.phi, %20
  %23 = add <4 x i32> %vec.phi37, %21
  %index.next = add nuw i64 %index, 8
  %24 = icmp eq i64 %index.next, %n.vec
  br i1 %24, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %bin.rdx = add <4 x i32> %23, %22
  %25 = call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> %bin.rdx)
  br label %scalar.ph.preheader

scalar.ph.preheader:                              ; preds = %middle.block, %.preheader.us
  %indvars.iv28.ph = phi i64 [ 0, %.preheader.us ], [ %n.vec, %middle.block ]
  %.118.us.ph = phi i32 [ %.01522.us, %.preheader.us ], [ %25, %middle.block ]
  br label %scalar.ph

scalar.ph:                                        ; preds = %scalar.ph.preheader, %scalar.ph
  %indvars.iv28 = phi i64 [ %indvars.iv.next29, %scalar.ph ], [ %indvars.iv28.ph, %scalar.ph.preheader ]
  %.118.us = phi i32 [ %spec.select.us, %scalar.ph ], [ %.118.us.ph, %scalar.ph.preheader ]
  %26 = getelementptr inbounds [2 x i32], ptr %6, i64 %indvars.iv28
  %27 = load i32, ptr %26, align 8, !tbaa !5
  %28 = icmp eq i32 %13, %27
  %29 = zext i1 %28 to i32
  %spec.select.us = add nsw i32 %.118.us, %29
  %indvars.iv.next29 = add nuw nsw i64 %indvars.iv28, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next29, %wide.trip.count34
  br i1 %exitcond.not, label %._crit_edge.us, label %scalar.ph, !llvm.loop !13

._crit_edge.us:                                   ; preds = %scalar.ph
  %indvars.iv.next32 = add nuw nsw i64 %indvars.iv31, 1
  %exitcond35.not = icmp eq i64 %indvars.iv.next32, %wide.trip.count34
  br i1 %exitcond35.not, label %._crit_edge24, label %.preheader.us, !llvm.loop !14

.lr.ph:                                           ; preds = %0, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ]
  %30 = getelementptr inbounds [2 x i32], ptr %6, i64 %indvars.iv
  %31 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %30)
  %32 = getelementptr inbounds i8, ptr %30, i64 4
  %33 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %31, ptr noundef nonnull align 4 dereferenceable(4) %32)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %34 = load i32, ptr %1, align 4, !tbaa !5
  %35 = sext i32 %34 to i64
  %36 = icmp slt i64 %indvars.iv.next, %35
  br i1 %36, label %.lr.ph, label %.preheader16, !llvm.loop !15

._crit_edge24:                                    ; preds = %._crit_edge.us, %0, %.preheader16
  %.015.lcssa = phi i32 [ 0, %.preheader16 ], [ 0, %0 ], [ %spec.select.us, %._crit_edge.us ]
  %37 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %.015.lcssa)
  call void @llvm.stackrestore.p0(ptr %5)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #5
  ret i32 0
}

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

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #3

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

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #3

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.vector.reduce.add.v4i32(<4 x i32>) #4

attributes #0 = { 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 #1 = { mustprogress 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 nocallback nofree nosync nounwind willreturn }
attributes #4 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #5 = { 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, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !12, !11}
!14 = distinct !{!14, !10}
!15 = distinct !{!15, !10}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopInstSimplifyPass,LoopRotatePass,LoopSimplifyCFGPass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,ReassociatePass,SROAPass,SimplifyCFGPass