; LLVM IR from reyadussalahin/problem-solving :: data_structure/segment_tree/codeforces/F558E (Solution)

; 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 { [28 x i32] }

; Function Attrs: nounwind uwtable
define dso_local void @merge(ptr dead_on_unwind noalias writable sret(%struct.Node) align 4 %0, ptr noundef byval(%struct.Node) align 8 %1, ptr noundef byval(%struct.Node) align 8 %2) #0 {
  %4 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !5
  br label %5

5:                                                ; preds = %24, %3
  %6 = load i32, ptr %4, align 4, !tbaa !5
  %7 = icmp slt i32 %6, 26
  br i1 %7, label %8, label %27

8:                                                ; preds = %5
  %9 = getelementptr inbounds %struct.Node, ptr %1, i32 0, i32 0
  %10 = load i32, ptr %4, align 4, !tbaa !5
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds [28 x i32], ptr %9, i64 0, i64 %11
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %14 = getelementptr inbounds %struct.Node, ptr %2, i32 0, i32 0
  %15 = load i32, ptr %4, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [28 x i32], ptr %14, i64 0, i64 %16
  %18 = load i32, ptr %17, align 4, !tbaa !5
  %19 = add nsw i32 %13, %18
  %20 = getelementptr inbounds %struct.Node, ptr %0, i32 0, i32 0
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [28 x i32], ptr %20, i64 0, i64 %22
  store i32 %19, ptr %23, align 4, !tbaa !5
  br label %24

24:                                               ; preds = %8
  %25 = load i32, ptr %4, align 4, !tbaa !5
  %26 = add nsw i32 %25, 1
  store i32 %26, ptr %4, align 4, !tbaa !5
  br label %5, !llvm.loop !9

27:                                               ; preds = %5
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { 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 = { 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/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; 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 { [28 x i32] }

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: readwrite) uwtable
define dso_local void @merge(ptr dead_on_unwind noalias nocapture writable writeonly sret(%struct.Node) align 4 %0, ptr nocapture noundef readonly byval(%struct.Node) align 8 %1, ptr nocapture noundef readonly byval(%struct.Node) align 8 %2) local_unnamed_addr #0 {
  %4 = load <4 x i32>, ptr %1, align 8, !tbaa !5
  %5 = load <4 x i32>, ptr %2, align 8, !tbaa !5
  %6 = add nsw <4 x i32> %5, %4
  store <4 x i32> %6, ptr %0, align 4, !tbaa !5
  %7 = getelementptr inbounds i8, ptr %1, i64 16
  %8 = getelementptr inbounds i8, ptr %2, i64 16
  %9 = getelementptr inbounds i8, ptr %0, i64 16
  %10 = load <4 x i32>, ptr %7, align 8, !tbaa !5
  %11 = load <4 x i32>, ptr %8, align 8, !tbaa !5
  %12 = add nsw <4 x i32> %11, %10
  store <4 x i32> %12, ptr %9, align 4, !tbaa !5
  %13 = getelementptr inbounds i8, ptr %1, i64 32
  %14 = getelementptr inbounds i8, ptr %2, i64 32
  %15 = getelementptr inbounds i8, ptr %0, i64 32
  %16 = load <4 x i32>, ptr %13, align 8, !tbaa !5
  %17 = load <4 x i32>, ptr %14, align 8, !tbaa !5
  %18 = add nsw <4 x i32> %17, %16
  store <4 x i32> %18, ptr %15, align 4, !tbaa !5
  %19 = getelementptr inbounds i8, ptr %1, i64 48
  %20 = getelementptr inbounds i8, ptr %2, i64 48
  %21 = getelementptr inbounds i8, ptr %0, i64 48
  %22 = load <4 x i32>, ptr %19, align 8, !tbaa !5
  %23 = load <4 x i32>, ptr %20, align 8, !tbaa !5
  %24 = add nsw <4 x i32> %23, %22
  store <4 x i32> %24, ptr %21, align 4, !tbaa !5
  %25 = getelementptr inbounds i8, ptr %1, i64 64
  %26 = getelementptr inbounds i8, ptr %2, i64 64
  %27 = getelementptr inbounds i8, ptr %0, i64 64
  %28 = load <4 x i32>, ptr %25, align 8, !tbaa !5
  %29 = load <4 x i32>, ptr %26, align 8, !tbaa !5
  %30 = add nsw <4 x i32> %29, %28
  store <4 x i32> %30, ptr %27, align 4, !tbaa !5
  %31 = getelementptr inbounds i8, ptr %1, i64 80
  %32 = getelementptr inbounds i8, ptr %2, i64 80
  %33 = getelementptr inbounds i8, ptr %0, i64 80
  %34 = load <4 x i32>, ptr %31, align 8, !tbaa !5
  %35 = load <4 x i32>, ptr %32, align 8, !tbaa !5
  %36 = add nsw <4 x i32> %35, %34
  store <4 x i32> %36, ptr %33, align 4, !tbaa !5
  %37 = getelementptr inbounds i8, ptr %1, i64 96
  %38 = getelementptr inbounds i8, ptr %2, i64 96
  %39 = getelementptr inbounds i8, ptr %0, i64 96
  %40 = load <2 x i32>, ptr %37, align 8, !tbaa !5
  %41 = load <2 x i32>, ptr %38, align 8, !tbaa !5
  %42 = add nsw <2 x i32> %41, %40
  store <2 x i32> %42, ptr %39, align 4, !tbaa !5
  ret void
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: readwrite) 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/C++ TBAA"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,PostOrderFunctionAttrsPass,ReassociatePass,SLPVectorizerPass,SROAPass,SimplifyCFGPass