; LLVM IR from gargarchit/Data_Structure_n_Algorithms :: Linked_List/Implementation.ll (Z12merge2sortedP4NodeS0_)

; 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 @_Z12merge2sortedP4NodeS0_(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
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %7 = load ptr, ptr %4, align 8, !tbaa !5
  %8 = icmp eq ptr %7, null
  br i1 %8, label %9, label %11

9:                                                ; preds = %2
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %10, ptr %3, align 8
  br label %51

11:                                               ; preds = %2
  %12 = load ptr, ptr %5, align 8, !tbaa !5
  %13 = icmp eq ptr %12, null
  br i1 %13, label %14, label %16

14:                                               ; preds = %11
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %15, ptr %3, align 8
  br label %51

16:                                               ; preds = %11
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = icmp eq ptr %17, null
  br i1 %18, label %19, label %23

19:                                               ; preds = %16
  %20 = load ptr, ptr %5, align 8, !tbaa !5
  %21 = icmp eq ptr %20, null
  br i1 %21, label %22, label %23

22:                                               ; preds = %19
  store ptr null, ptr %3, align 8
  br label %51

23:                                               ; preds = %19, %16
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  store ptr null, ptr %6, align 8, !tbaa !5
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = getelementptr inbounds %class.Node, ptr %24, i32 0, i32 0
  %26 = load i32, ptr %25, align 8, !tbaa !9
  %27 = load ptr, ptr %5, align 8, !tbaa !5
  %28 = getelementptr inbounds %class.Node, ptr %27, i32 0, i32 0
  %29 = load i32, ptr %28, align 8, !tbaa !9
  %30 = icmp slt i32 %26, %29
  br i1 %30, label %31, label %40

31:                                               ; preds = %23
  %32 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %32, ptr %6, align 8, !tbaa !5
  %33 = load ptr, ptr %4, align 8, !tbaa !5
  %34 = getelementptr inbounds %class.Node, ptr %33, i32 0, i32 1
  %35 = load ptr, ptr %34, align 8, !tbaa !12
  %36 = load ptr, ptr %5, align 8, !tbaa !5
  %37 = call noundef ptr @_Z12merge2sortedP4NodeS0_(ptr noundef %35, ptr noundef %36)
  %38 = load ptr, ptr %6, align 8, !tbaa !5
  %39 = getelementptr inbounds %class.Node, ptr %38, i32 0, i32 1
  store ptr %37, ptr %39, align 8, !tbaa !12
  br label %49

40:                                               ; preds = %23
  %41 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %41, ptr %6, align 8, !tbaa !5
  %42 = load ptr, ptr %4, align 8, !tbaa !5
  %43 = load ptr, ptr %5, align 8, !tbaa !5
  %44 = getelementptr inbounds %class.Node, ptr %43, i32 0, i32 1
  %45 = load ptr, ptr %44, align 8, !tbaa !12
  %46 = call noundef ptr @_Z12merge2sortedP4NodeS0_(ptr noundef %42, ptr noundef %45)
  %47 = load ptr, ptr %6, align 8, !tbaa !5
  %48 = getelementptr inbounds %class.Node, ptr %47, i32 0, i32 1
  store ptr %46, ptr %48, align 8, !tbaa !12
  br label %49

49:                                               ; preds = %40, %31
  %50 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %50, ptr %3, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %51

51:                                               ; preds = %49, %22, %14, %9
  %52 = load ptr, ptr %3, align 8
  ret ptr %52
}

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 @_Z12merge2sortedP4NodeS0_(ptr noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq ptr %0, null
  br i1 %3, label %common.ret22, label %4

4:                                                ; preds = %2
  %5 = icmp eq ptr %1, null
  br i1 %5, label %common.ret22, label %6

6:                                                ; preds = %4
  %7 = load i32, ptr %0, align 8, !tbaa !5
  %8 = load i32, ptr %1, align 8, !tbaa !5
  %9 = icmp slt i32 %7, %8
  br i1 %9, label %10, label %14

common.ret22:                                     ; preds = %4, %2, %14, %10
  %common.ret22.op = phi ptr [ %0, %10 ], [ %1, %14 ], [ %1, %2 ], [ %0, %4 ]
  ret ptr %common.ret22.op

10:                                               ; preds = %6
  %11 = getelementptr inbounds i8, ptr %0, i64 8
  %12 = load ptr, ptr %11, align 8, !tbaa !11
  %13 = tail call noundef ptr @_Z12merge2sortedP4NodeS0_(ptr noundef %12, ptr noundef nonnull %1)
  store ptr %13, ptr %11, align 8, !tbaa !11
  br label %common.ret22

14:                                               ; preds = %6
  %15 = getelementptr inbounds i8, ptr %1, i64 8
  %16 = load ptr, ptr %15, align 8, !tbaa !11
  %17 = tail call noundef ptr @_Z12merge2sortedP4NodeS0_(ptr noundef nonnull %0, ptr noundef %16)
  store ptr %17, ptr %15, align 8, !tbaa !11
  br label %common.ret22
}

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,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass