; LLVM IR from tangjz/acm-icpc :: hdu/6087.ll (Z5BuildiPi)

; 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"

%struct.Treap = type { i32, i32, i32, i32, i64 }

@tot = external dso_local global i32, align 4
@pool = external dso_local global [2500001 x %struct.Treap], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z8Maintaini(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 uwtable
define dso_local noundef i32 @_Z5BuildiPi(i32 noundef %0, ptr noundef %1) #2 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !9
  %8 = load i32, ptr %4, align 4, !tbaa !5
  %9 = icmp sle i32 %8, 0
  br i1 %9, label %10, label %11

10:                                               ; preds = %2
  store i32 0, ptr %3, align 4
  br label %49

11:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %12 = load i32, ptr %4, align 4, !tbaa !5
  %13 = sub nsw i32 %12, 1
  %14 = ashr i32 %13, 1
  store i32 %14, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %15 = load i32, ptr @tot, align 4, !tbaa !5
  %16 = add nsw i32 %15, 1
  store i32 %16, ptr @tot, align 4, !tbaa !5
  store i32 %15, ptr %7, align 4, !tbaa !5
  %17 = load i32, ptr %6, align 4, !tbaa !5
  %18 = load ptr, ptr %5, align 8, !tbaa !9
  %19 = call noundef i32 @_Z5BuildiPi(i32 noundef %17, ptr noundef %18)
  %20 = load i32, ptr %7, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds [2500001 x %struct.Treap], ptr @pool, i64 0, i64 %21
  %23 = getelementptr inbounds %struct.Treap, ptr %22, i32 0, i32 0
  store i32 %19, ptr %23, align 8, !tbaa !11
  %24 = load ptr, ptr %5, align 8, !tbaa !9
  %25 = load i32, ptr %6, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds i32, ptr %24, i64 %26
  %28 = load i32, ptr %27, align 4, !tbaa !5
  %29 = load i32, ptr %7, align 4, !tbaa !5
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds [2500001 x %struct.Treap], ptr @pool, i64 0, i64 %30
  %32 = getelementptr inbounds %struct.Treap, ptr %31, i32 0, i32 3
  store i32 %28, ptr %32, align 4, !tbaa !14
  %33 = load i32, ptr %4, align 4, !tbaa !5
  %34 = load i32, ptr %6, align 4, !tbaa !5
  %35 = sub nsw i32 %33, %34
  %36 = sub nsw i32 %35, 1
  %37 = load ptr, ptr %5, align 8, !tbaa !9
  %38 = load i32, ptr %6, align 4, !tbaa !5
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds i32, ptr %37, i64 %39
  %41 = getelementptr inbounds i32, ptr %40, i64 1
  %42 = call noundef i32 @_Z5BuildiPi(i32 noundef %36, ptr noundef %41)
  %43 = load i32, ptr %7, align 4, !tbaa !5
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds [2500001 x %struct.Treap], ptr @pool, i64 0, i64 %44
  %46 = getelementptr inbounds %struct.Treap, ptr %45, i32 0, i32 1
  store i32 %42, ptr %46, align 4, !tbaa !15
  %47 = load i32, ptr %7, align 4, !tbaa !5
  call void @_Z8Maintaini(i32 noundef %47)
  %48 = load i32, ptr %7, align 4, !tbaa !5
  store i32 %48, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  br label %49

49:                                               ; preds = %11, %10
  %50 = load i32, ptr %3, align 4
  ret i32 %50
}

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 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 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !6, i64 0}
!12 = !{!"_ZTS5Treap", !6, i64 0, !6, i64 4, !6, i64 8, !6, i64 12, !13, i64 16}
!13 = !{!"long long", !7, i64 0}
!14 = !{!12, !6, i64 12}
!15 = !{!12, !6, i64 4}


; 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"

%struct.Treap = type { i32, i32, i32, i32, i64 }

@tot = external dso_local local_unnamed_addr global i32, align 4
@pool = external dso_local local_unnamed_addr global [2500001 x %struct.Treap], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z8Maintaini(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z5BuildiPi(i32 noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = icmp slt i32 %0, 1
  br i1 %3, label %common.ret16, label %4

common.ret16:                                     ; preds = %2, %4
  %common.ret16.op = phi i32 [ %7, %4 ], [ 0, %2 ]
  ret i32 %common.ret16.op

4:                                                ; preds = %2
  %5 = add nsw i32 %0, -1
  %6 = lshr i32 %5, 1
  %7 = load i32, ptr @tot, align 4, !tbaa !5
  %8 = add nsw i32 %7, 1
  store i32 %8, ptr @tot, align 4, !tbaa !5
  %9 = tail call noundef i32 @_Z5BuildiPi(i32 noundef %6, ptr noundef %1)
  %10 = sext i32 %7 to i64
  %11 = getelementptr inbounds [2500001 x %struct.Treap], ptr @pool, i64 0, i64 %10
  store i32 %9, ptr %11, align 8, !tbaa !9
  %12 = zext nneg i32 %6 to i64
  %13 = getelementptr inbounds i32, ptr %1, i64 %12
  %14 = load i32, ptr %13, align 4, !tbaa !5
  %15 = getelementptr inbounds i8, ptr %11, i64 12
  store i32 %14, ptr %15, align 4, !tbaa !12
  %16 = xor i32 %6, -1
  %17 = add nsw i32 %16, %0
  %18 = getelementptr inbounds i8, ptr %13, i64 4
  %19 = tail call noundef i32 @_Z5BuildiPi(i32 noundef %17, ptr noundef nonnull %18)
  %20 = getelementptr inbounds i8, ptr %11, i64 4
  store i32 %19, ptr %20, align 4, !tbaa !13
  tail call void @_Z8Maintaini(i32 noundef %7)
  br label %common.ret16
}

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" }

!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, !6, i64 0}
!10 = !{!"_ZTS5Treap", !6, i64 0, !6, i64 4, !6, i64 8, !6, i64 12, !11, i64 16}
!11 = !{!"long long", !7, i64 0}
!12 = !{!10, !6, i64 12}
!13 = !{!10, !6, i64 4}


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