; LLVM IR from tangjz/acm-icpc :: lydsy/4115.ll (Z5buildii)

; 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"

@seg = external dso_local global [1048576 x i32], align 16
@f = external dso_local global [500001 x i64], align 16

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z5buildii(i32 noundef %0, i32 noundef %1) #1 {
  %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 %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = load i32, ptr %4, align 4, !tbaa !5
  %12 = call noundef i32 @_Z7seg_idxii(i32 noundef %10, i32 noundef %11)
  store i32 %12, ptr %5, align 4, !tbaa !5
  %13 = load i32, ptr %3, align 4, !tbaa !5
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = icmp eq i32 %13, %14
  br i1 %15, label %16, label %21

16:                                               ; preds = %2
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [1048576 x i32], ptr @seg, i64 0, i64 %19
  store i32 %17, ptr %20, align 4, !tbaa !5
  store i32 1, ptr %6, align 4
  br label %68

21:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %22 = load i32, ptr %3, align 4, !tbaa !5
  %23 = load i32, ptr %4, align 4, !tbaa !5
  %24 = add nsw i32 %22, %23
  %25 = ashr i32 %24, 1
  store i32 %25, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  %26 = load i32, ptr %3, align 4, !tbaa !5
  %27 = load i32, ptr %7, align 4, !tbaa !5
  %28 = call noundef i32 @_Z7seg_idxii(i32 noundef %26, i32 noundef %27)
  store i32 %28, ptr %8, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  %29 = load i32, ptr %7, align 4, !tbaa !5
  %30 = add nsw i32 %29, 1
  %31 = load i32, ptr %4, align 4, !tbaa !5
  %32 = call noundef i32 @_Z7seg_idxii(i32 noundef %30, i32 noundef %31)
  store i32 %32, ptr %9, align 4, !tbaa !5
  %33 = load i32, ptr %3, align 4, !tbaa !5
  %34 = load i32, ptr %7, align 4, !tbaa !5
  call void @_Z5buildii(i32 noundef %33, i32 noundef %34)
  %35 = load i32, ptr %7, align 4, !tbaa !5
  %36 = add nsw i32 %35, 1
  %37 = load i32, ptr %4, align 4, !tbaa !5
  call void @_Z5buildii(i32 noundef %36, i32 noundef %37)
  %38 = load i32, ptr %8, align 4, !tbaa !5
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds [1048576 x i32], ptr @seg, i64 0, i64 %39
  %41 = load i32, ptr %40, align 4, !tbaa !5
  %42 = sext i32 %41 to i64
  %43 = getelementptr inbounds [500001 x i64], ptr @f, i64 0, i64 %42
  %44 = load i64, ptr %43, align 8, !tbaa !9
  %45 = load i32, ptr %9, align 4, !tbaa !5
  %46 = sext i32 %45 to i64
  %47 = getelementptr inbounds [1048576 x i32], ptr @seg, i64 0, i64 %46
  %48 = load i32, ptr %47, align 4, !tbaa !5
  %49 = sext i32 %48 to i64
  %50 = getelementptr inbounds [500001 x i64], ptr @f, i64 0, i64 %49
  %51 = load i64, ptr %50, align 8, !tbaa !9
  %52 = icmp sge i64 %44, %51
  br i1 %52, label %53, label %58

53:                                               ; preds = %21
  %54 = load i32, ptr %8, align 4, !tbaa !5
  %55 = sext i32 %54 to i64
  %56 = getelementptr inbounds [1048576 x i32], ptr @seg, i64 0, i64 %55
  %57 = load i32, ptr %56, align 4, !tbaa !5
  br label %63

58:                                               ; preds = %21
  %59 = load i32, ptr %9, align 4, !tbaa !5
  %60 = sext i32 %59 to i64
  %61 = getelementptr inbounds [1048576 x i32], ptr @seg, i64 0, i64 %60
  %62 = load i32, ptr %61, align 4, !tbaa !5
  br label %63

63:                                               ; preds = %58, %53
  %64 = phi i32 [ %57, %53 ], [ %62, %58 ]
  %65 = load i32, ptr %5, align 4, !tbaa !5
  %66 = sext i32 %65 to i64
  %67 = getelementptr inbounds [1048576 x i32], ptr @seg, i64 0, i64 %66
  store i32 %64, ptr %67, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  store i32 0, ptr %6, align 4
  br label %68

68:                                               ; preds = %63, %16
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  %69 = load i32, ptr %6, align 4
  switch i32 %69, label %71 [
    i32 0, label %70
    i32 1, label %70
  ]

70:                                               ; preds = %68, %68
  ret void

71:                                               ; preds = %68
  unreachable
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7seg_idxii(i32 noundef, i32 noundef) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long long", !7, i64 0}


; 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"

@seg = external dso_local local_unnamed_addr global [1048576 x i32], align 16
@f = external dso_local local_unnamed_addr global [500001 x i64], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z5buildii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = tail call noundef i32 @_Z7seg_idxii(i32 noundef %0, i32 noundef %1)
  %4 = icmp eq i32 %0, %1
  br i1 %4, label %common.ret, label %7

common.ret:                                       ; preds = %2, %7
  %.sink = phi i32 [ %., %7 ], [ %0, %2 ]
  %5 = sext i32 %3 to i64
  %6 = getelementptr inbounds [1048576 x i32], ptr @seg, i64 0, i64 %5
  store i32 %.sink, ptr %6, align 4, !tbaa !5
  ret void

7:                                                ; preds = %2
  %8 = add nsw i32 %1, %0
  %9 = ashr i32 %8, 1
  %10 = tail call noundef i32 @_Z7seg_idxii(i32 noundef %0, i32 noundef %9)
  %11 = add nsw i32 %9, 1
  %12 = tail call noundef i32 @_Z7seg_idxii(i32 noundef %11, i32 noundef %1)
  tail call void @_Z5buildii(i32 noundef %0, i32 noundef %9)
  tail call void @_Z5buildii(i32 noundef %11, i32 noundef %1)
  %13 = sext i32 %10 to i64
  %14 = getelementptr inbounds [1048576 x i32], ptr @seg, i64 0, i64 %13
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [500001 x i64], ptr @f, i64 0, i64 %16
  %18 = load i64, ptr %17, align 8, !tbaa !9
  %19 = sext i32 %12 to i64
  %20 = getelementptr inbounds [1048576 x i32], ptr @seg, i64 0, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [500001 x i64], ptr @f, i64 0, i64 %22
  %24 = load i64, ptr %23, align 8, !tbaa !9
  %.not = icmp slt i64 %18, %24
  %. = select i1 %.not, i32 %21, i32 %15
  br label %common.ret
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7seg_idxii(i32 noundef, i32 noundef) 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"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long long", !7, i64 0}


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