; LLVM IR from VastoLorde95/Competitive-Programming :: Hackerrank/World Cup 2016/World Cup Round 2/Problem E/E.ll (Z5buildiii)

; 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.node = type { i32, i32 }

@tree = external dso_local global [1048576 x %struct.node], align 16

; Function Attrs: mustprogress uwtable
define dso_local void @_Z5buildiii(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
  %9 = 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
  %10 = load i32, ptr %5, align 4, !tbaa !5
  %11 = add nsw i32 %10, 1
  %12 = load i32, ptr %6, align 4, !tbaa !5
  %13 = icmp eq i32 %11, %12
  br i1 %13, label %14, label %19

14:                                               ; preds = %3
  %15 = load i32, ptr %4, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [1048576 x %struct.node], ptr @tree, i64 0, i64 %16
  %18 = getelementptr inbounds %struct.node, ptr %17, i32 0, i32 0
  store i32 0, ptr %18, align 8, !tbaa !9
  br label %43

19:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %20 = load i32, ptr %4, align 4, !tbaa !5
  %21 = shl i32 %20, 1
  store i32 %21, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  %22 = load i32, ptr %7, align 4, !tbaa !5
  %23 = add nsw i32 %22, 1
  store i32 %23, ptr %8, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  %24 = load i32, ptr %5, align 4, !tbaa !5
  %25 = load i32, ptr %6, align 4, !tbaa !5
  %26 = add nsw i32 %24, %25
  %27 = ashr i32 %26, 1
  store i32 %27, ptr %9, align 4, !tbaa !5
  %28 = load i32, ptr %7, align 4, !tbaa !5
  %29 = load i32, ptr %5, align 4, !tbaa !5
  %30 = load i32, ptr %9, align 4, !tbaa !5
  call void @_Z5buildiii(i32 noundef %28, i32 noundef %29, i32 noundef %30)
  %31 = load i32, ptr %8, align 4, !tbaa !5
  %32 = load i32, ptr %9, align 4, !tbaa !5
  %33 = load i32, ptr %6, align 4, !tbaa !5
  call void @_Z5buildiii(i32 noundef %31, i32 noundef %32, i32 noundef %33)
  %34 = load i32, ptr %4, align 4, !tbaa !5
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds [1048576 x %struct.node], ptr @tree, i64 0, i64 %35
  %37 = load i32, ptr %7, align 4, !tbaa !5
  %38 = sext i32 %37 to i64
  %39 = getelementptr inbounds [1048576 x %struct.node], ptr @tree, i64 0, i64 %38
  %40 = load i32, ptr %8, align 4, !tbaa !5
  %41 = sext i32 %40 to i64
  %42 = getelementptr inbounds [1048576 x %struct.node], ptr @tree, i64 0, i64 %41
  call void @_ZN4node7combineERS_S0_(ptr noundef nonnull align 4 dereferenceable(8) %36, ptr noundef nonnull align 4 dereferenceable(8) %39, ptr noundef nonnull align 4 dereferenceable(8) %42)
  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
  br label %43

43:                                               ; preds = %19, %14
  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: mustprogress nounwind uwtable
declare dso_local void @_ZN4node7combineERS_S0_(ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(8)) #2 align 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 = { 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, !6, i64 0}
!10 = !{!"_ZTS4node", !6, i64 0, !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.node = type { i32, i32 }

@tree = external dso_local global [1048576 x %struct.node], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z5buildiii(i32 noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = add nsw i32 %1, 1
  %5 = icmp eq i32 %4, %2
  br i1 %5, label %common.ret, label %8

common.ret:                                       ; preds = %3
  %6 = sext i32 %0 to i64
  %7 = getelementptr inbounds [1048576 x %struct.node], ptr @tree, i64 0, i64 %6
  store i32 0, ptr %7, align 8, !tbaa !5
  br label %common.ret16

common.ret16:                                     ; preds = %8, %common.ret
  ret void

8:                                                ; preds = %3
  %9 = shl i32 %0, 1
  %10 = or disjoint i32 %9, 1
  %11 = add nsw i32 %2, %1
  %12 = ashr i32 %11, 1
  tail call void @_Z5buildiii(i32 noundef %9, i32 noundef %1, i32 noundef %12)
  tail call void @_Z5buildiii(i32 noundef %10, i32 noundef %12, i32 noundef %2)
  %13 = sext i32 %0 to i64
  %14 = getelementptr inbounds [1048576 x %struct.node], ptr @tree, i64 0, i64 %13
  %15 = sext i32 %9 to i64
  %16 = getelementptr inbounds [1048576 x %struct.node], ptr @tree, i64 0, i64 %15
  %17 = sext i32 %10 to i64
  %18 = getelementptr inbounds [1048576 x %struct.node], ptr @tree, i64 0, i64 %17
  tail call void @_ZN4node7combineERS_S0_(ptr noundef nonnull align 4 dereferenceable(8) %14, ptr noundef nonnull align 4 dereferenceable(8) %16, ptr noundef nonnull align 4 dereferenceable(8) %18)
  br label %common.ret16
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN4node7combineERS_S0_(ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(8)) local_unnamed_addr #0 align 2

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, !7, i64 0}
!6 = !{!"_ZTS4node", !7, i64 0, !7, i64 4}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}


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