; LLVM IR from VastoLorde95/Competitive-Programming :: Codeforces/270/Problem A (A)

; 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_ostream" = type { ptr, %"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 }

@n = external dso_local global i32, align 4
@p = external dso_local global [1000001 x i32], align 16
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str.1 = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n)
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  store i32 2, ptr %2, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %37, %0
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = load i32, ptr @n, align 4, !tbaa !5
  %10 = icmp sle i32 %8, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %7
  store i32 2, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  br label %40

12:                                               ; preds = %7
  %13 = load i32, ptr %2, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [1000001 x i32], ptr @p, i64 0, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = icmp ne i32 %16, 0
  br i1 %17, label %36, label %18

18:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #5
  %19 = load i32, ptr %2, align 4, !tbaa !5
  %20 = load i32, ptr %2, align 4, !tbaa !5
  %21 = add nsw i32 %19, %20
  store i32 %21, ptr %4, align 4, !tbaa !5
  br label %22

22:                                               ; preds = %31, %18
  %23 = load i32, ptr %4, align 4, !tbaa !5
  %24 = load i32, ptr @n, align 4, !tbaa !5
  %25 = icmp sle i32 %23, %24
  br i1 %25, label %27, label %26

26:                                               ; preds = %22
  store i32 5, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #5
  br label %35

27:                                               ; preds = %22
  %28 = load i32, ptr %4, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [1000001 x i32], ptr @p, i64 0, i64 %29
  store i32 1, ptr %30, align 4, !tbaa !5
  br label %31

31:                                               ; preds = %27
  %32 = load i32, ptr %2, align 4, !tbaa !5
  %33 = load i32, ptr %4, align 4, !tbaa !5
  %34 = add nsw i32 %33, %32
  store i32 %34, ptr %4, align 4, !tbaa !5
  br label %22, !llvm.loop !9

35:                                               ; preds = %26
  br label %36

36:                                               ; preds = %35, %12
  br label %37

37:                                               ; preds = %36
  %38 = load i32, ptr %2, align 4, !tbaa !5
  %39 = add nsw i32 %38, 1
  store i32 %39, ptr %2, align 4, !tbaa !5
  br label %7, !llvm.loop !11

40:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #5
  store i32 2, ptr %5, align 4, !tbaa !5
  br label %41

41:                                               ; preds = %70, %40
  %42 = load i32, ptr %5, align 4, !tbaa !5
  %43 = load i32, ptr @n, align 4, !tbaa !5
  %44 = icmp sle i32 %42, %43
  br i1 %44, label %46, label %45

45:                                               ; preds = %41
  store i32 8, ptr %3, align 4
  br label %73

46:                                               ; preds = %41
  %47 = load i32, ptr %5, align 4, !tbaa !5
  %48 = sext i32 %47 to i64
  %49 = getelementptr inbounds [1000001 x i32], ptr @p, i64 0, i64 %48
  %50 = load i32, ptr %49, align 4, !tbaa !5
  %51 = icmp ne i32 %50, 0
  br i1 %51, label %52, label %69

52:                                               ; preds = %46
  %53 = load i32, ptr @n, align 4, !tbaa !5
  %54 = load i32, ptr %5, align 4, !tbaa !5
  %55 = sub nsw i32 %53, %54
  %56 = sext i32 %55 to i64
  %57 = getelementptr inbounds [1000001 x i32], ptr @p, i64 0, i64 %56
  %58 = load i32, ptr %57, align 4, !tbaa !5
  %59 = icmp ne i32 %58, 0
  br i1 %59, label %60, label %69

60:                                               ; preds = %52
  %61 = load i32, ptr %5, align 4, !tbaa !5
  %62 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %61)
  %63 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) %62, ptr noundef @.str.1)
  %64 = load i32, ptr @n, align 4, !tbaa !5
  %65 = load i32, ptr %5, align 4, !tbaa !5
  %66 = sub nsw i32 %64, %65
  %67 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) %63, i32 noundef %66)
  %68 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) %67, ptr noundef @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
  store i32 0, ptr %1, align 4
  store i32 1, ptr %3, align 4
  br label %73

69:                                               ; preds = %52, %46
  br label %70

70:                                               ; preds = %69
  %71 = load i32, ptr %5, align 4, !tbaa !5
  %72 = add nsw i32 %71, 1
  store i32 %72, ptr %5, align 4, !tbaa !5
  br label %41, !llvm.loop !12

73:                                               ; preds = %60, %45
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #5
  %74 = load i32, ptr %3, align 4
  switch i32 %74, label %78 [
    i32 8, label %75
    i32 1, label %76
  ]

75:                                               ; preds = %73
  store i32 0, ptr %1, align 4
  br label %76

76:                                               ; preds = %75, %73
  %77 = load i32, ptr %1, align 4
  ret i32 %77

78:                                               ; preds = %73
  unreachable
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #1

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

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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) #3

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #1

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) #4 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_(ptr noundef nonnull align 8 dereferenceable(8)) #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 = { "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 = { 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 #4 = { 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 = { 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_ostream" = type { ptr, %"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 }

@n = external dso_local global i32, align 4
@p = external dso_local local_unnamed_addr global [1000001 x i32], align 16
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str.1 = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n)
  %2 = load i32, ptr @n, align 4, !tbaa !5
  %.not31 = icmp slt i32 %2, 2
  br i1 %.not31, label %.loopexit, label %.lr.ph33.preheader

.lr.ph33.preheader:                               ; preds = %0
  %3 = add nuw i32 %2, 1
  %wide.trip.count = zext i32 %3 to i64
  br label %.lr.ph33

.preheader:                                       ; preds = %.loopexit27
  br i1 %.not31, label %.loopexit, label %.lr.ph36.preheader

.lr.ph36.preheader:                               ; preds = %.preheader
  %4 = zext nneg i32 %2 to i64
  %5 = add nuw i32 %2, 1
  %wide.trip.count47 = zext i32 %5 to i64
  br label %.lr.ph36

.lr.ph33:                                         ; preds = %.lr.ph33.preheader, %.loopexit27
  %indvars.iv38 = phi i64 [ 2, %.lr.ph33.preheader ], [ %indvars.iv.next39, %.loopexit27 ]
  %indvars.iv = phi i64 [ 4, %.lr.ph33.preheader ], [ %indvars.iv.next, %.loopexit27 ]
  %6 = getelementptr inbounds [1000001 x i32], ptr @p, i64 0, i64 %indvars.iv38
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %.not25 = icmp ne i32 %7, 0
  %indvars.iv38.tr = trunc i64 %indvars.iv38 to i32
  %8 = shl i32 %indvars.iv38.tr, 1
  %.not2629 = icmp sgt i32 %8, %2
  %or.cond = or i1 %.not25, %.not2629
  br i1 %or.cond, label %.loopexit27, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph33, %.lr.ph
  %indvars.iv40 = phi i64 [ %indvars.iv.next41, %.lr.ph ], [ %indvars.iv, %.lr.ph33 ]
  %9 = getelementptr inbounds [1000001 x i32], ptr @p, i64 0, i64 %indvars.iv40
  store i32 1, ptr %9, align 4, !tbaa !5
  %indvars.iv.next41 = add nuw nsw i64 %indvars.iv40, %indvars.iv38
  %10 = trunc nuw i64 %indvars.iv.next41 to i32
  %.not26 = icmp slt i32 %2, %10
  br i1 %.not26, label %.loopexit27, label %.lr.ph, !llvm.loop !9

.loopexit27:                                      ; preds = %.lr.ph, %.lr.ph33
  %indvars.iv.next39 = add nuw nsw i64 %indvars.iv38, 1
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 2
  %exitcond.not = icmp eq i64 %indvars.iv.next39, %wide.trip.count
  br i1 %exitcond.not, label %.preheader, label %.lr.ph33, !llvm.loop !11

.lr.ph36:                                         ; preds = %.lr.ph36.preheader, %25
  %indvars.iv44 = phi i64 [ 2, %.lr.ph36.preheader ], [ %indvars.iv.next45, %25 ]
  %11 = getelementptr inbounds [1000001 x i32], ptr @p, i64 0, i64 %indvars.iv44
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %.not23 = icmp eq i32 %12, 0
  br i1 %.not23, label %25, label %13

13:                                               ; preds = %.lr.ph36
  %14 = sub nsw i64 %4, %indvars.iv44
  %15 = getelementptr inbounds [1000001 x i32], ptr @p, i64 0, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %.not24 = icmp eq i32 %16, 0
  br i1 %.not24, label %25, label %17

17:                                               ; preds = %13
  %18 = trunc nuw nsw i64 %indvars.iv44 to i32
  %19 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %18)
  %20 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) %19, ptr noundef nonnull @.str.1)
  %21 = load i32, ptr @n, align 4, !tbaa !5
  %22 = sub nsw i32 %21, %18
  %23 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) %20, i32 noundef %22)
  %24 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) %23, ptr noundef nonnull @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
  br label %.loopexit

25:                                               ; preds = %.lr.ph36, %13
  %indvars.iv.next45 = add nuw nsw i64 %indvars.iv44, 1
  %exitcond48.not = icmp eq i64 %indvars.iv.next45, %wide.trip.count47
  br i1 %exitcond48.not, label %.loopexit, label %.lr.ph36, !llvm.loop !12

.loopexit:                                        ; preds = %25, %0, %.preheader, %17
  ret i32 0
}

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; 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

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) local_unnamed_addr #3

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) local_unnamed_addr #4 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_(ptr noundef nonnull align 8 dereferenceable(8)) #2

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 = { 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 = { 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 = { "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 = { 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" }

!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}


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