; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 22. Segment Tree/max sum subarray from l to r.ll (Z6answeriiiii)

; 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 { i64, i64, i64, i64 }

@seg_tree = external dso_local global [1000005 x %struct.node], 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 nounwind uwtable
declare dso_local void @_Z10empty_Nodev(ptr dead_on_unwind noalias writable sret(%struct.node) align 8) #1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z7combine4nodeS_(ptr dead_on_unwind noalias writable sret(%struct.node) align 8, ptr noundef byval(%struct.node) align 8, ptr noundef byval(%struct.node) align 8) #2

; Function Attrs: mustprogress uwtable
define dso_local void @_Z6answeriiiii(ptr dead_on_unwind noalias writable sret(%struct.node) align 8 %0, i32 noundef %1, i32 noundef %2, i32 noundef %3, i32 noundef %4, i32 noundef %5) #2 {
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  %12 = alloca i32, align 4
  %13 = alloca %struct.node, align 8
  %14 = alloca %struct.node, align 8
  %15 = alloca %struct.node, align 8
  %16 = alloca %struct.node, align 8
  store i32 %1, ptr %7, align 4, !tbaa !5
  store i32 %2, ptr %8, align 4, !tbaa !5
  store i32 %3, ptr %9, align 4, !tbaa !5
  store i32 %4, ptr %10, align 4, !tbaa !5
  store i32 %5, ptr %11, align 4, !tbaa !5
  %17 = load i32, ptr %8, align 4, !tbaa !5
  %18 = load i32, ptr %11, align 4, !tbaa !5
  %19 = icmp sgt i32 %17, %18
  br i1 %19, label %24, label %20

20:                                               ; preds = %6
  %21 = load i32, ptr %9, align 4, !tbaa !5
  %22 = load i32, ptr %10, align 4, !tbaa !5
  %23 = icmp slt i32 %21, %22
  br i1 %23, label %24, label %25

24:                                               ; preds = %20, %6
  call void @_Z10empty_Nodev(ptr dead_on_unwind writable sret(%struct.node) align 8 %0)
  br label %56

25:                                               ; preds = %20
  %26 = load i32, ptr %8, align 4, !tbaa !5
  %27 = load i32, ptr %10, align 4, !tbaa !5
  %28 = icmp sge i32 %26, %27
  br i1 %28, label %29, label %37

29:                                               ; preds = %25
  %30 = load i32, ptr %9, align 4, !tbaa !5
  %31 = load i32, ptr %11, align 4, !tbaa !5
  %32 = icmp sle i32 %30, %31
  br i1 %32, label %33, label %37

33:                                               ; preds = %29
  %34 = load i32, ptr %7, align 4, !tbaa !5
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds [1000005 x %struct.node], ptr @seg_tree, i64 0, i64 %35
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %0, ptr align 16 %36, i64 32, i1 false), !tbaa.struct !9
  br label %56

37:                                               ; preds = %29, %25
  call void @llvm.lifetime.start.p0(i64 4, ptr %12) #4
  %38 = load i32, ptr %8, align 4, !tbaa !5
  %39 = load i32, ptr %9, align 4, !tbaa !5
  %40 = add nsw i32 %38, %39
  %41 = sdiv i32 %40, 2
  store i32 %41, ptr %12, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 32, ptr %13) #4
  %42 = load i32, ptr %7, align 4, !tbaa !5
  %43 = mul nsw i32 2, %42
  %44 = load i32, ptr %8, align 4, !tbaa !5
  %45 = load i32, ptr %12, align 4, !tbaa !5
  %46 = load i32, ptr %10, align 4, !tbaa !5
  %47 = load i32, ptr %11, align 4, !tbaa !5
  call void @_Z6answeriiiii(ptr dead_on_unwind writable sret(%struct.node) align 8 %13, i32 noundef %43, i32 noundef %44, i32 noundef %45, i32 noundef %46, i32 noundef %47)
  call void @llvm.lifetime.start.p0(i64 32, ptr %14) #4
  %48 = load i32, ptr %7, align 4, !tbaa !5
  %49 = mul nsw i32 2, %48
  %50 = add nsw i32 %49, 1
  %51 = load i32, ptr %12, align 4, !tbaa !5
  %52 = add nsw i32 %51, 1
  %53 = load i32, ptr %9, align 4, !tbaa !5
  %54 = load i32, ptr %10, align 4, !tbaa !5
  %55 = load i32, ptr %11, align 4, !tbaa !5
  call void @_Z6answeriiiii(ptr dead_on_unwind writable sret(%struct.node) align 8 %14, i32 noundef %50, i32 noundef %52, i32 noundef %53, i32 noundef %54, i32 noundef %55)
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %15, ptr align 8 %13, i64 32, i1 false), !tbaa.struct !9
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %16, ptr align 8 %14, i64 32, i1 false), !tbaa.struct !9
  call void @_Z7combine4nodeS_(ptr dead_on_unwind writable sret(%struct.node) align 8 %0, ptr noundef byval(%struct.node) align 8 %15, ptr noundef byval(%struct.node) align 8 %16)
  call void @llvm.lifetime.end.p0(i64 32, ptr %14) #4
  call void @llvm.lifetime.end.p0(i64 32, ptr %13) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %12) #4
  br label %56

56:                                               ; preds = %37, %33, %24
  ret void
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #3

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { 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 = !{i64 0, i64 8, !10, i64 8, i64 8, !10, i64 16, i64 8, !10, i64 24, i64 8, !10}
!10 = !{!11, !11, i64 0}
!11 = !{!"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"

%struct.node = type { i64, i64, i64, i64 }

@seg_tree = external dso_local local_unnamed_addr global [1000005 x %struct.node], align 16

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

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z10empty_Nodev(ptr dead_on_unwind noalias writable sret(%struct.node) align 8) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z7combine4nodeS_(ptr dead_on_unwind noalias writable sret(%struct.node) align 8, ptr noundef byval(%struct.node) align 8, ptr noundef byval(%struct.node) align 8) local_unnamed_addr #2

; Function Attrs: mustprogress uwtable
define dso_local void @_Z6answeriiiii(ptr dead_on_unwind noalias writable sret(%struct.node) align 8 %0, i32 noundef %1, i32 noundef %2, i32 noundef %3, i32 noundef %4, i32 noundef %5) local_unnamed_addr #2 {
  %7 = alloca %struct.node, align 8
  %8 = alloca %struct.node, align 8
  %9 = icmp sgt i32 %2, %5
  %10 = icmp slt i32 %3, %4
  %or.cond = or i1 %10, %9
  br i1 %or.cond, label %11, label %12

11:                                               ; preds = %6
  tail call void @_Z10empty_Nodev(ptr dead_on_unwind writable sret(%struct.node) align 8 %0)
  br label %22

12:                                               ; preds = %6
  %.not = icmp slt i32 %2, %4
  %.not24 = icmp sgt i32 %3, %5
  %or.cond25 = or i1 %.not, %.not24
  br i1 %or.cond25, label %16, label %13

13:                                               ; preds = %12
  %14 = sext i32 %1 to i64
  %15 = getelementptr inbounds [1000005 x %struct.node], ptr @seg_tree, i64 0, i64 %14
  tail call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 8 dereferenceable(32) %0, ptr noundef nonnull align 16 dereferenceable(32) %15, i64 32, i1 false), !tbaa.struct !5
  br label %22

16:                                               ; preds = %12
  %17 = add nsw i32 %3, %2
  %18 = sdiv i32 %17, 2
  call void @llvm.lifetime.start.p0(i64 32, ptr nonnull %7) #4
  %19 = shl nsw i32 %1, 1
  call void @_Z6answeriiiii(ptr dead_on_unwind nonnull writable sret(%struct.node) align 8 %7, i32 noundef %19, i32 noundef %2, i32 noundef %18, i32 noundef %4, i32 noundef %5)
  call void @llvm.lifetime.start.p0(i64 32, ptr nonnull %8) #4
  %20 = or disjoint i32 %19, 1
  %21 = add nsw i32 %18, 1
  call void @_Z6answeriiiii(ptr dead_on_unwind nonnull writable sret(%struct.node) align 8 %8, i32 noundef %20, i32 noundef %21, i32 noundef %3, i32 noundef %4, i32 noundef %5)
  call void @_Z7combine4nodeS_(ptr dead_on_unwind writable sret(%struct.node) align 8 %0, ptr noundef nonnull byval(%struct.node) align 8 %7, ptr noundef nonnull byval(%struct.node) align 8 %8)
  call void @llvm.lifetime.end.p0(i64 32, ptr nonnull %8) #4
  call void @llvm.lifetime.end.p0(i64 32, ptr nonnull %7) #4
  br label %22

22:                                               ; preds = %16, %13, %11
  ret void
}

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #3

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { 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 = !{i64 0, i64 8, !6, i64 8, i64 8, !6, i64 16, i64 8, !6, i64 24, i64 8, !6}
!6 = !{!7, !7, i64 0}
!7 = !{!"long long", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}


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