; LLVM IR from plskz/competitive-programming :: Junior Training Sheet/A (169)

; 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" }
%"class.std::initializer_list" = type { ptr, i64 }

@_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 i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca %"class.std::initializer_list", align 8
  %8 = alloca [4 x i32], align 4
  store i32 0, ptr %1, align 4
  %9 = call noundef zeroext i1 @_ZNSt8ios_base15sync_with_stdioEb(i1 noundef zeroext false)
  %10 = load ptr, ptr @_ZSt3cin, align 8, !tbaa !5
  %11 = getelementptr i8, ptr %10, i64 -24
  %12 = load i64, ptr %11, align 8
  %13 = getelementptr inbounds i8, ptr @_ZSt3cin, i64 %12
  %14 = call noundef ptr @_ZNSt9basic_iosIcSt11char_traitsIcEE3tieEPSo(ptr noundef nonnull align 8 dereferenceable(264) %13, ptr noundef null)
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  %15 = 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)
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #5
  store i32 1, ptr %5, align 4, !tbaa !8
  br label %16

16:                                               ; preds = %34, %0
  %17 = load i32, ptr %5, align 4, !tbaa !8
  %18 = load i32, ptr %2, align 4, !tbaa !8
  %19 = icmp sle i32 %17, %18
  br i1 %19, label %21, label %20

20:                                               ; preds = %16
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #5
  br label %37

21:                                               ; preds = %16
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #5
  %22 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %6)
  %23 = load i32, ptr %6, align 4, !tbaa !8
  %24 = icmp eq i32 %23, 1
  br i1 %24, label %25, label %27

25:                                               ; preds = %21
  %26 = load i32, ptr %5, align 4, !tbaa !8
  store i32 %26, ptr %3, align 4, !tbaa !8
  br label %27

27:                                               ; preds = %25, %21
  %28 = load i32, ptr %6, align 4, !tbaa !8
  %29 = load i32, ptr %2, align 4, !tbaa !8
  %30 = icmp eq i32 %28, %29
  br i1 %30, label %31, label %33

31:                                               ; preds = %27
  %32 = load i32, ptr %5, align 4, !tbaa !8
  store i32 %32, ptr %4, align 4, !tbaa !8
  br label %33

33:                                               ; preds = %31, %27
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #5
  br label %34

34:                                               ; preds = %33
  %35 = load i32, ptr %5, align 4, !tbaa !8
  %36 = add nsw i32 %35, 1
  store i32 %36, ptr %5, align 4, !tbaa !8
  br label %16, !llvm.loop !11

37:                                               ; preds = %20
  call void @llvm.lifetime.start.p0(i64 16, ptr %8) #5
  %38 = load i32, ptr %3, align 4, !tbaa !8
  %39 = sub nsw i32 %38, 1
  store i32 %39, ptr %8, align 4, !tbaa !8
  %40 = getelementptr inbounds i32, ptr %8, i64 1
  %41 = load i32, ptr %4, align 4, !tbaa !8
  %42 = sub nsw i32 %41, 1
  store i32 %42, ptr %40, align 4, !tbaa !8
  %43 = getelementptr inbounds i32, ptr %8, i64 2
  %44 = load i32, ptr %2, align 4, !tbaa !8
  %45 = load i32, ptr %3, align 4, !tbaa !8
  %46 = sub nsw i32 %44, %45
  store i32 %46, ptr %43, align 4, !tbaa !8
  %47 = getelementptr inbounds i32, ptr %8, i64 3
  %48 = load i32, ptr %2, align 4, !tbaa !8
  %49 = load i32, ptr %4, align 4, !tbaa !8
  %50 = sub nsw i32 %48, %49
  store i32 %50, ptr %47, align 4, !tbaa !8
  %51 = getelementptr inbounds %"class.std::initializer_list", ptr %7, i32 0, i32 0
  store ptr %8, ptr %51, align 8, !tbaa !13
  %52 = getelementptr inbounds %"class.std::initializer_list", ptr %7, i32 0, i32 1
  store i64 4, ptr %52, align 8, !tbaa !17
  %53 = getelementptr inbounds { ptr, i64 }, ptr %7, i32 0, i32 0
  %54 = load ptr, ptr %53, align 8
  %55 = getelementptr inbounds { ptr, i64 }, ptr %7, i32 0, i32 1
  %56 = load i64, ptr %55, align 8
  %57 = call noundef i32 @_ZSt3maxIiET_St16initializer_listIS0_E(ptr %54, i64 %56)
  %58 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %57)
  call void @llvm.lifetime.end.p0(i64 16, ptr %8) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  ret i32 0
}

declare noundef zeroext i1 @_ZNSt8ios_base15sync_with_stdioEb(i1 noundef zeroext) #1

; Function Attrs: mustprogress nounwind uwtable
declare noundef ptr @_ZNSt9basic_iosIcSt11char_traitsIcEE3tieEPSo(ptr noundef nonnull align 8 dereferenceable(264), ptr noundef) #2 align 2

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

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) #1

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

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

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef i32 @_ZSt3maxIiET_St16initializer_listIS0_E(ptr, i64) #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 = { "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 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 #3 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { 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 = !{!"vtable pointer", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"int", !10, i64 0}
!10 = !{!"omnipotent char", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!14, !15, i64 0}
!14 = !{!"_ZTSSt16initializer_listIiE", !15, i64 0, !16, i64 8}
!15 = !{!"any pointer", !10, i64 0}
!16 = !{!"long", !10, i64 0}
!17 = !{!14, !16, 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" }

@_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
  %2 = alloca i32, align 4
  %3 = alloca [4 x i32], align 4
  %4 = tail call noundef zeroext i1 @_ZNSt8ios_base15sync_with_stdioEb(i1 noundef zeroext false)
  %5 = load ptr, ptr @_ZSt3cin, align 8, !tbaa !5
  %6 = getelementptr i8, ptr %5, i64 -24
  %7 = load i64, ptr %6, align 8
  %8 = getelementptr inbounds i8, ptr @_ZSt3cin, i64 %7
  %9 = tail call noundef ptr @_ZNSt9basic_iosIcSt11char_traitsIcEE3tieEPSo(ptr noundef nonnull align 8 dereferenceable(264) %8, ptr noundef null)
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #5
  %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) %1)
  %11 = load i32, ptr %1, align 4, !tbaa !8
  %.not11 = icmp slt i32 %11, 1
  br i1 %.not11, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %0
  %.08.lcssa = phi i32 [ undef, %0 ], [ %.19, %.lr.ph ]
  %.0.lcssa = phi i32 [ undef, %0 ], [ %spec.select, %.lr.ph ]
  %.lcssa = phi i32 [ %11, %0 ], [ %24, %.lr.ph ]
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %3) #5
  %12 = add nsw i32 %.0.lcssa, -1
  store i32 %12, ptr %3, align 4, !tbaa !8
  %13 = getelementptr inbounds i8, ptr %3, i64 4
  %14 = add nsw i32 %.08.lcssa, -1
  store i32 %14, ptr %13, align 4, !tbaa !8
  %15 = getelementptr inbounds i8, ptr %3, i64 8
  %16 = sub nsw i32 %.lcssa, %.0.lcssa
  store i32 %16, ptr %15, align 4, !tbaa !8
  %17 = getelementptr inbounds i8, ptr %3, i64 12
  %18 = sub nsw i32 %.lcssa, %.08.lcssa
  store i32 %18, ptr %17, align 4, !tbaa !8
  %19 = call noundef i32 @_ZSt3maxIiET_St16initializer_listIS0_E(ptr nonnull %3, i64 4)
  %20 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %19)
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %3) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #5
  ret i32 0

.lr.ph:                                           ; preds = %0, %.lr.ph
  %.014 = phi i32 [ %spec.select, %.lr.ph ], [ undef, %0 ]
  %.0813 = phi i32 [ %.19, %.lr.ph ], [ undef, %0 ]
  %.01012 = phi i32 [ %26, %.lr.ph ], [ 1, %0 ]
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #5
  %21 = 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)
  %22 = load i32, ptr %2, align 4, !tbaa !8
  %23 = icmp eq i32 %22, 1
  %spec.select = select i1 %23, i32 %.01012, i32 %.014
  %24 = load i32, ptr %1, align 4, !tbaa !8
  %25 = icmp eq i32 %22, %24
  %.19 = select i1 %25, i32 %.01012, i32 %.0813
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #5
  %26 = add nuw nsw i32 %.01012, 1
  %.not.not = icmp slt i32 %.01012, %24
  br i1 %.not.not, label %.lr.ph, label %._crit_edge, !llvm.loop !11
}

declare noundef zeroext i1 @_ZNSt8ios_base15sync_with_stdioEb(i1 noundef zeroext) local_unnamed_addr #1

; Function Attrs: mustprogress nounwind uwtable
declare noundef ptr @_ZNSt9basic_iosIcSt11char_traitsIcEE3tieEPSo(ptr noundef nonnull align 8 dereferenceable(264), ptr noundef) local_unnamed_addr #2 align 2

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

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 #1

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

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

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef i32 @_ZSt3maxIiET_St16initializer_listIS0_E(ptr, i64) local_unnamed_addr #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 = { "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 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 #3 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { 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 = !{!"vtable pointer", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"int", !10, i64 0}
!10 = !{!"omnipotent char", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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