; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 10. Linked List/MergeSortLinkedList.ll (Z11sortedMergeP4NodeS0_)

; 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"

%class.Node = type { i32, ptr }

; 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 noundef ptr @_Z11sortedMergeP4NodeS0_(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  store ptr null, ptr %6, align 8, !tbaa !5
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  %9 = icmp eq ptr %8, null
  br i1 %9, label %10, label %12

10:                                               ; preds = %2
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %11, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %46

12:                                               ; preds = %2
  %13 = load ptr, ptr %5, align 8, !tbaa !5
  %14 = icmp eq ptr %13, null
  br i1 %14, label %15, label %17

15:                                               ; preds = %12
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %16, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %46

17:                                               ; preds = %12
  br label %18

18:                                               ; preds = %17
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  %20 = getelementptr inbounds %class.Node, ptr %19, i32 0, i32 0
  %21 = load i32, ptr %20, align 8, !tbaa !9
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = getelementptr inbounds %class.Node, ptr %22, i32 0, i32 0
  %24 = load i32, ptr %23, align 8, !tbaa !9
  %25 = icmp sle i32 %21, %24
  br i1 %25, label %26, label %35

26:                                               ; preds = %18
  %27 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %27, ptr %6, align 8, !tbaa !5
  %28 = load ptr, ptr %4, align 8, !tbaa !5
  %29 = getelementptr inbounds %class.Node, ptr %28, i32 0, i32 1
  %30 = load ptr, ptr %29, align 8, !tbaa !12
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = call noundef ptr @_Z11sortedMergeP4NodeS0_(ptr noundef %30, ptr noundef %31)
  %33 = load ptr, ptr %6, align 8, !tbaa !5
  %34 = getelementptr inbounds %class.Node, ptr %33, i32 0, i32 1
  store ptr %32, ptr %34, align 8, !tbaa !12
  br label %44

35:                                               ; preds = %18
  %36 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %36, ptr %6, align 8, !tbaa !5
  %37 = load ptr, ptr %4, align 8, !tbaa !5
  %38 = load ptr, ptr %5, align 8, !tbaa !5
  %39 = getelementptr inbounds %class.Node, ptr %38, i32 0, i32 1
  %40 = load ptr, ptr %39, align 8, !tbaa !12
  %41 = call noundef ptr @_Z11sortedMergeP4NodeS0_(ptr noundef %37, ptr noundef %40)
  %42 = load ptr, ptr %6, align 8, !tbaa !5
  %43 = getelementptr inbounds %class.Node, ptr %42, i32 0, i32 1
  store ptr %41, ptr %43, align 8, !tbaa !12
  br label %44

44:                                               ; preds = %35, %26
  %45 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %45, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %46

46:                                               ; preds = %44, %15, %10
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  %47 = load ptr, ptr %3, align 8
  ret ptr %47
}

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 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !11, i64 0}
!10 = !{!"_ZTS4Node", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 8}


; 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"

; Function Attrs: mustprogress nofree nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local noundef ptr @_Z11sortedMergeP4NodeS0_(ptr noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq ptr %0, null
  br i1 %3, label %common.ret19, label %4

4:                                                ; preds = %2
  %5 = icmp eq ptr %1, null
  br i1 %5, label %common.ret19, label %6

6:                                                ; preds = %4
  %7 = load i32, ptr %0, align 8, !tbaa !5
  %8 = load i32, ptr %1, align 8, !tbaa !5
  %.not = icmp sgt i32 %7, %8
  br i1 %.not, label %13, label %9

common.ret19:                                     ; preds = %4, %2, %13, %9
  %common.ret19.op = phi ptr [ %0, %9 ], [ %1, %13 ], [ %1, %2 ], [ %0, %4 ]
  ret ptr %common.ret19.op

9:                                                ; preds = %6
  %10 = getelementptr inbounds i8, ptr %0, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  %12 = tail call noundef ptr @_Z11sortedMergeP4NodeS0_(ptr noundef %11, ptr noundef nonnull %1)
  store ptr %12, ptr %10, align 8, !tbaa !11
  br label %common.ret19

13:                                               ; preds = %6
  %14 = getelementptr inbounds i8, ptr %1, i64 8
  %15 = load ptr, ptr %14, align 8, !tbaa !11
  %16 = tail call noundef ptr @_Z11sortedMergeP4NodeS0_(ptr noundef nonnull %0, ptr noundef %15)
  store ptr %16, ptr %14, align 8, !tbaa !11
  br label %common.ret19
}

attributes #0 = { mustprogress nofree nosync nounwind memory(readwrite, inaccessiblemem: none) 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, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !10, i64 8}


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