; LLVM IR from bqi343/cp-notebook :: Contests/USACO Solutions/2015-16/Dec 2015/Gold (15 Dec G2)

; 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_ifstream" = type { %"class.std::basic_istream.base", %"class.std::basic_filebuf", %"class.std::basic_ios" }
%"class.std::basic_istream.base" = type { ptr, i64 }
%"class.std::basic_filebuf" = type { %"class.std::basic_streambuf", %union.pthread_mutex_t, %"class.std::__basic_file", i32, %struct.__mbstate_t, %struct.__mbstate_t, %struct.__mbstate_t, ptr, i64, i8, i8, i8, i8, ptr, ptr, i8, ptr, ptr, i64, ptr, ptr }
%"class.std::basic_streambuf" = type { ptr, ptr, ptr, ptr, ptr, ptr, ptr, %"class.std::locale" }
%"class.std::locale" = type { ptr }
%union.pthread_mutex_t = type { %struct.__pthread_mutex_s }
%struct.__pthread_mutex_s = type { i32, i32, i32, i32, i32, i16, i16, %struct.__pthread_internal_list }
%struct.__pthread_internal_list = type { ptr, ptr }
%"class.std::__basic_file" = type <{ ptr, i8, [7 x i8] }>
%struct.__mbstate_t = type { i32, %union.anon }
%union.anon = type { i32 }
%"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::basic_ofstream" = type { %"class.std::basic_ostream.base", %"class.std::basic_filebuf", %"class.std::basic_ios" }
%"class.std::basic_ostream.base" = type { ptr }

@cin = external dso_local global %"class.std::basic_ifstream", align 8
@cout = external dso_local global %"class.std::basic_ofstream", align 8
@array1 = external dso_local global [5000001 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7findmaxi(i32 noundef) #0

; 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 memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #2 {
  %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
  %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
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #4
  store i32 0, ptr %5, align 4, !tbaa !5
  %10 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @cin, ptr noundef nonnull align 4 dereferenceable(4) %2)
  %11 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %10, ptr noundef nonnull align 4 dereferenceable(4) %3)
  %12 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %11, ptr noundef nonnull align 4 dereferenceable(4) %4)
  store i32 1, ptr @array1, align 16, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #4
  store i32 1, ptr %6, align 4, !tbaa !5
  br label %13

13:                                               ; preds = %53, %0
  %14 = load i32, ptr %6, align 4, !tbaa !5
  %15 = load i32, ptr %2, align 4, !tbaa !5
  %16 = icmp sle i32 %14, %15
  br i1 %16, label %18, label %17

17:                                               ; preds = %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  br label %56

18:                                               ; preds = %13
  %19 = load i32, ptr %6, align 4, !tbaa !5
  %20 = load i32, ptr %3, align 4, !tbaa !5
  %21 = sub nsw i32 %19, %20
  %22 = icmp sge i32 %21, 0
  br i1 %22, label %23, label %35

23:                                               ; preds = %18
  %24 = load i32, ptr %6, align 4, !tbaa !5
  %25 = load i32, ptr %3, align 4, !tbaa !5
  %26 = sub nsw i32 %24, %25
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds [5000001 x i32], ptr @array1, i64 0, i64 %27
  %29 = load i32, ptr %28, align 4, !tbaa !5
  %30 = icmp eq i32 %29, 1
  br i1 %30, label %31, label %35

31:                                               ; preds = %23
  %32 = load i32, ptr %6, align 4, !tbaa !5
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds [5000001 x i32], ptr @array1, i64 0, i64 %33
  store i32 1, ptr %34, align 4, !tbaa !5
  br label %35

35:                                               ; preds = %31, %23, %18
  %36 = load i32, ptr %6, align 4, !tbaa !5
  %37 = load i32, ptr %4, align 4, !tbaa !5
  %38 = sub nsw i32 %36, %37
  %39 = icmp sge i32 %38, 0
  br i1 %39, label %40, label %52

40:                                               ; preds = %35
  %41 = load i32, ptr %6, align 4, !tbaa !5
  %42 = load i32, ptr %4, align 4, !tbaa !5
  %43 = sub nsw i32 %41, %42
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds [5000001 x i32], ptr @array1, i64 0, i64 %44
  %46 = load i32, ptr %45, align 4, !tbaa !5
  %47 = icmp eq i32 %46, 1
  br i1 %47, label %48, label %52

48:                                               ; preds = %40
  %49 = load i32, ptr %6, align 4, !tbaa !5
  %50 = sext i32 %49 to i64
  %51 = getelementptr inbounds [5000001 x i32], ptr @array1, i64 0, i64 %50
  store i32 1, ptr %51, align 4, !tbaa !5
  br label %52

52:                                               ; preds = %48, %40, %35
  br label %53

53:                                               ; preds = %52
  %54 = load i32, ptr %6, align 4, !tbaa !5
  %55 = add nsw i32 %54, 1
  store i32 %55, ptr %6, align 4, !tbaa !5
  br label %13, !llvm.loop !9

56:                                               ; preds = %17
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  store i32 0, ptr %7, align 4, !tbaa !5
  br label %57

57:                                               ; preds = %84, %56
  %58 = load i32, ptr %7, align 4, !tbaa !5
  %59 = load i32, ptr %2, align 4, !tbaa !5
  %60 = icmp sle i32 %58, %59
  br i1 %60, label %62, label %61

61:                                               ; preds = %57
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  br label %87

62:                                               ; preds = %57
  %63 = load i32, ptr %7, align 4, !tbaa !5
  %64 = sext i32 %63 to i64
  %65 = getelementptr inbounds [5000001 x i32], ptr @array1, i64 0, i64 %64
  %66 = load i32, ptr %65, align 4, !tbaa !5
  %67 = icmp ne i32 %66, 0
  br i1 %67, label %68, label %83

68:                                               ; preds = %62
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #4
  %69 = load i32, ptr %7, align 4, !tbaa !5
  %70 = sdiv i32 %69, 2
  store i32 %70, ptr %8, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #4
  %71 = load i32, ptr %8, align 4, !tbaa !5
  %72 = load i32, ptr %2, align 4, !tbaa !5
  %73 = load i32, ptr %8, align 4, !tbaa !5
  %74 = sub nsw i32 %72, %73
  %75 = call noundef i32 @_Z7findmaxi(i32 noundef %74)
  %76 = add nsw i32 %71, %75
  store i32 %76, ptr %9, align 4, !tbaa !5
  %77 = load i32, ptr %9, align 4, !tbaa !5
  %78 = load i32, ptr %5, align 4, !tbaa !5
  %79 = icmp sgt i32 %77, %78
  br i1 %79, label %80, label %82

80:                                               ; preds = %68
  %81 = load i32, ptr %9, align 4, !tbaa !5
  store i32 %81, ptr %5, align 4, !tbaa !5
  br label %82

82:                                               ; preds = %80, %68
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #4
  br label %83

83:                                               ; preds = %82, %62
  br label %84

84:                                               ; preds = %83
  %85 = load i32, ptr %7, align 4, !tbaa !5
  %86 = add nsw i32 %85, 1
  store i32 %86, ptr %7, align 4, !tbaa !5
  br label %57, !llvm.loop !11

87:                                               ; preds = %61
  %88 = load i32, ptr %5, align 4, !tbaa !5
  %89 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @cout, i32 noundef %88)
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #4
  %90 = load i32, ptr %1, align 4
  ret i32 %90
}

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) #3

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

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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 #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 = { 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}


; 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_ifstream" = type { %"class.std::basic_istream.base", %"class.std::basic_filebuf", %"class.std::basic_ios" }
%"class.std::basic_istream.base" = type { ptr, i64 }
%"class.std::basic_filebuf" = type { %"class.std::basic_streambuf", %union.pthread_mutex_t, %"class.std::__basic_file", i32, %struct.__mbstate_t, %struct.__mbstate_t, %struct.__mbstate_t, ptr, i64, i8, i8, i8, i8, ptr, ptr, i8, ptr, ptr, i64, ptr, ptr }
%"class.std::basic_streambuf" = type { ptr, ptr, ptr, ptr, ptr, ptr, ptr, %"class.std::locale" }
%"class.std::locale" = type { ptr }
%union.pthread_mutex_t = type { %struct.__pthread_mutex_s }
%struct.__pthread_mutex_s = type { i32, i32, i32, i32, i32, i16, i16, %struct.__pthread_internal_list }
%struct.__pthread_internal_list = type { ptr, ptr }
%"class.std::__basic_file" = type <{ ptr, i8, [7 x i8] }>
%struct.__mbstate_t = type { i32, %union.anon }
%union.anon = type { i32 }
%"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::basic_ofstream" = type { %"class.std::basic_ostream.base", %"class.std::basic_filebuf", %"class.std::basic_ios" }
%"class.std::basic_ostream.base" = type { ptr }

@cin = external dso_local global %"class.std::basic_ifstream", align 8
@cout = external dso_local global %"class.std::basic_ofstream", align 8
@array1 = external dso_local local_unnamed_addr global [5000001 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7findmaxi(i32 noundef) local_unnamed_addr #0

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

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

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #2 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #5
  %4 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @cin, ptr noundef nonnull align 4 dereferenceable(4) %1)
  %5 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %4, ptr noundef nonnull align 4 dereferenceable(4) %2)
  %6 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %5, ptr noundef nonnull align 4 dereferenceable(4) %3)
  store i32 1, ptr @array1, align 16, !tbaa !5
  %7 = load i32, ptr %1, align 4, !tbaa !5
  %.not27 = icmp slt i32 %7, 1
  br i1 %.not27, label %.preheader, label %.lr.ph

.lr.ph:                                           ; preds = %0
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = load i32, ptr %3, align 4, !tbaa !5
  %10 = sext i32 %8 to i64
  %11 = sext i32 %9 to i64
  %12 = add nuw i32 %7, 1
  %wide.trip.count = zext i32 %12 to i64
  br label %13

.preheader:                                       ; preds = %31, %0
  %.not2529 = icmp slt i32 %7, 0
  br i1 %.not2529, label %._crit_edge, label %.lr.ph32

13:                                               ; preds = %.lr.ph, %31
  %indvars.iv = phi i64 [ 1, %.lr.ph ], [ %indvars.iv.next, %31 ]
  %14 = sub nsw i64 %indvars.iv, %10
  %15 = icmp sgt i64 %14, -1
  br i1 %15, label %16, label %22

16:                                               ; preds = %13
  %17 = getelementptr inbounds [5000001 x i32], ptr @array1, i64 0, i64 %14
  %18 = load i32, ptr %17, align 4, !tbaa !5
  %19 = icmp eq i32 %18, 1
  br i1 %19, label %20, label %22

20:                                               ; preds = %16
  %21 = getelementptr inbounds [5000001 x i32], ptr @array1, i64 0, i64 %indvars.iv
  store i32 1, ptr %21, align 4, !tbaa !5
  br label %22

22:                                               ; preds = %20, %16, %13
  %23 = sub nsw i64 %indvars.iv, %11
  %24 = icmp sgt i64 %23, -1
  br i1 %24, label %25, label %31

25:                                               ; preds = %22
  %26 = getelementptr inbounds [5000001 x i32], ptr @array1, i64 0, i64 %23
  %27 = load i32, ptr %26, align 4, !tbaa !5
  %28 = icmp eq i32 %27, 1
  br i1 %28, label %29, label %31

29:                                               ; preds = %25
  %30 = getelementptr inbounds [5000001 x i32], ptr @array1, i64 0, i64 %indvars.iv
  store i32 1, ptr %30, align 4, !tbaa !5
  br label %31

31:                                               ; preds = %22, %25, %29
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %.preheader, label %13, !llvm.loop !9

._crit_edge:                                      ; preds = %42, %.preheader
  %.0.lcssa = phi i32 [ 0, %.preheader ], [ %.2, %42 ]
  %32 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @cout, i32 noundef %.0.lcssa)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #5
  ret i32 0

.lr.ph32:                                         ; preds = %.preheader, %42
  %33 = phi i32 [ %43, %42 ], [ %7, %.preheader ]
  %indvars.iv34 = phi i64 [ %indvars.iv.next35, %42 ], [ 0, %.preheader ]
  %.031 = phi i32 [ %.2, %42 ], [ 0, %.preheader ]
  %34 = getelementptr inbounds [5000001 x i32], ptr @array1, i64 0, i64 %indvars.iv34
  %35 = load i32, ptr %34, align 4, !tbaa !5
  %.not26 = icmp eq i32 %35, 0
  br i1 %.not26, label %42, label %36

36:                                               ; preds = %.lr.ph32
  %37 = trunc nuw nsw i64 %indvars.iv34 to i32
  %38 = lshr i32 %37, 1
  %39 = sub nsw i32 %33, %38
  %40 = call noundef i32 @_Z7findmaxi(i32 noundef %39)
  %41 = add nsw i32 %40, %38
  %spec.select = call i32 @llvm.smax.i32(i32 %41, i32 %.031)
  %.pre = load i32, ptr %1, align 4, !tbaa !5
  br label %42

42:                                               ; preds = %.lr.ph32, %36
  %43 = phi i32 [ %.pre, %36 ], [ %33, %.lr.ph32 ]
  %.2 = phi i32 [ %spec.select, %36 ], [ %.031, %.lr.ph32 ]
  %indvars.iv.next35 = add nuw nsw i64 %indvars.iv34, 1
  %44 = sext i32 %43 to i64
  %.not25.not = icmp slt i64 %indvars.iv34, %44
  br i1 %.not25.not, label %.lr.ph32, label %._crit_edge, !llvm.loop !11
}

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 #3

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

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #4

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 nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 #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 = { 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}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


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