; LLVM IR from tangjz/acm-icpc :: codeforces/complete/796F.ll (Z7seg_dfsiii)

; 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"

@upp = external dso_local global [300001 x i32], align 16
@seg = external dso_local global [600003 x i32], align 16

; Function Attrs: mustprogress uwtable
define dso_local void @_Z7seg_dfsiii(i32 noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %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
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = load i32, ptr %5, align 4, !tbaa !5
  %11 = call noundef i32 @_Z7seg_idxii(i32 noundef %9, i32 noundef %10)
  store i32 %11, ptr %7, align 4, !tbaa !5
  %12 = load i32, ptr %7, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [600003 x i32], ptr @seg, i64 0, i64 %13
  %15 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %6, ptr noundef nonnull align 4 dereferenceable(4) %14)
  %16 = load i32, ptr %15, align 4, !tbaa !5
  store i32 %16, ptr %6, align 4, !tbaa !5
  %17 = load i32, ptr %4, align 4, !tbaa !5
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = icmp eq i32 %17, %18
  br i1 %19, label %20, label %39

20:                                               ; preds = %3
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [300001 x i32], ptr @upp, i64 0, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !5
  %25 = icmp eq i32 %24, -1
  br i1 %25, label %26, label %31

26:                                               ; preds = %20
  %27 = load i32, ptr %6, align 4, !tbaa !5
  %28 = load i32, ptr %4, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [300001 x i32], ptr @upp, i64 0, i64 %29
  store i32 %27, ptr %30, align 4, !tbaa !5
  br label %31

31:                                               ; preds = %26, %20
  %32 = load i32, ptr %4, align 4, !tbaa !5
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds [300001 x i32], ptr @upp, i64 0, i64 %33
  %35 = load i32, ptr %34, align 4, !tbaa !5
  %36 = load i32, ptr %7, align 4, !tbaa !5
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds [600003 x i32], ptr @seg, i64 0, i64 %37
  store i32 %35, ptr %38, align 4, !tbaa !5
  br label %67

39:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  %40 = load i32, ptr %4, align 4, !tbaa !5
  %41 = load i32, ptr %5, align 4, !tbaa !5
  %42 = add nsw i32 %40, %41
  %43 = ashr i32 %42, 1
  store i32 %43, ptr %8, align 4, !tbaa !5
  %44 = load i32, ptr %4, align 4, !tbaa !5
  %45 = load i32, ptr %8, align 4, !tbaa !5
  %46 = load i32, ptr %6, align 4, !tbaa !5
  call void @_Z7seg_dfsiii(i32 noundef %44, i32 noundef %45, i32 noundef %46)
  %47 = load i32, ptr %8, align 4, !tbaa !5
  %48 = add nsw i32 %47, 1
  %49 = load i32, ptr %5, align 4, !tbaa !5
  %50 = load i32, ptr %6, align 4, !tbaa !5
  call void @_Z7seg_dfsiii(i32 noundef %48, i32 noundef %49, i32 noundef %50)
  %51 = load i32, ptr %4, align 4, !tbaa !5
  %52 = load i32, ptr %8, align 4, !tbaa !5
  %53 = call noundef i32 @_Z7seg_idxii(i32 noundef %51, i32 noundef %52)
  %54 = sext i32 %53 to i64
  %55 = getelementptr inbounds [600003 x i32], ptr @seg, i64 0, i64 %54
  %56 = load i32, ptr %8, align 4, !tbaa !5
  %57 = add nsw i32 %56, 1
  %58 = load i32, ptr %5, align 4, !tbaa !5
  %59 = call noundef i32 @_Z7seg_idxii(i32 noundef %57, i32 noundef %58)
  %60 = sext i32 %59 to i64
  %61 = getelementptr inbounds [600003 x i32], ptr @seg, i64 0, i64 %60
  %62 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %55, ptr noundef nonnull align 4 dereferenceable(4) %61)
  %63 = load i32, ptr %62, align 4, !tbaa !5
  %64 = load i32, ptr %7, align 4, !tbaa !5
  %65 = sext i32 %64 to i64
  %66 = getelementptr inbounds [600003 x i32], ptr @seg, i64 0, i64 %65
  store i32 %63, ptr %66, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  br label %67

67:                                               ; preds = %39, %31
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  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: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7seg_idxii(i32 noundef, i32 noundef) #2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #2

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

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 = { 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 #3 = { 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"}


; 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"

@upp = external dso_local local_unnamed_addr global [300001 x i32], align 16
@seg = external dso_local global [600003 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z7seg_dfsiii(i32 noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = alloca i32, align 4
  store i32 %2, ptr %4, align 4, !tbaa !5
  %5 = tail call noundef i32 @_Z7seg_idxii(i32 noundef %0, i32 noundef %1)
  %6 = sext i32 %5 to i64
  %7 = getelementptr inbounds [600003 x i32], ptr @seg, i64 0, i64 %6
  %8 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %4, ptr noundef nonnull align 4 dereferenceable(4) %7)
  %9 = load i32, ptr %8, align 4, !tbaa !5
  store i32 %9, ptr %4, align 4, !tbaa !5
  %10 = icmp eq i32 %0, %1
  br i1 %10, label %11, label %17

11:                                               ; preds = %3
  %12 = sext i32 %0 to i64
  %13 = getelementptr inbounds [300001 x i32], ptr @upp, i64 0, i64 %12
  %14 = load i32, ptr %13, align 4, !tbaa !5
  %15 = icmp eq i32 %14, -1
  br i1 %15, label %16, label %29

16:                                               ; preds = %11
  store i32 %9, ptr %13, align 4, !tbaa !5
  br label %29

17:                                               ; preds = %3
  %18 = add nsw i32 %1, %0
  %19 = ashr i32 %18, 1
  call void @_Z7seg_dfsiii(i32 noundef %0, i32 noundef %19, i32 noundef %9)
  %20 = add nsw i32 %19, 1
  %21 = load i32, ptr %4, align 4, !tbaa !5
  call void @_Z7seg_dfsiii(i32 noundef %20, i32 noundef %1, i32 noundef %21)
  %22 = call noundef i32 @_Z7seg_idxii(i32 noundef %0, i32 noundef %19)
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds [600003 x i32], ptr @seg, i64 0, i64 %23
  %25 = call noundef i32 @_Z7seg_idxii(i32 noundef %20, i32 noundef %1)
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [600003 x i32], ptr @seg, i64 0, i64 %26
  %28 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %24, ptr noundef nonnull align 4 dereferenceable(4) %27)
  %storemerge.pre = load i32, ptr %28, align 4, !tbaa !5
  br label %29

29:                                               ; preds = %11, %16, %17
  %storemerge = phi i32 [ %storemerge.pre, %17 ], [ %9, %16 ], [ %14, %11 ]
  store i32 %storemerge, ptr %7, align 4, !tbaa !5
  ret void
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7seg_idxii(i32 noundef, i32 noundef) local_unnamed_addr #1

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #1

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #1

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 = { 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" }

!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"}


; Effective O3 passes: BDCEPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass