; LLVM IR from kaynewbie/algorithm :: algorithm/CodingInterviews (linked-list)

; 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.ListNode = 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: nounwind uwtable
declare dso_local ptr @insertNode(ptr noundef, i32 noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local ptr @findPreviousNodeOfTarget(ptr noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local ptr @formatList(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  store ptr null, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %7 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %7, ptr %4, align 8, !tbaa !5
  store ptr null, ptr %6, align 8, !tbaa !5
  br label %8

8:                                                ; preds = %36, %1
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = icmp ne ptr %9, null
  br i1 %10, label %11, label %15

11:                                               ; preds = %8
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = load ptr, ptr %6, align 8, !tbaa !5
  %14 = icmp ne ptr %12, %13
  br label %15

15:                                               ; preds = %11, %8
  %16 = phi i1 [ false, %8 ], [ %14, %11 ]
  br i1 %16, label %17, label %41

17:                                               ; preds = %15
  %18 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %18, ptr %5, align 8, !tbaa !5
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.ListNode, ptr %19, i32 0, i32 0
  %21 = load i32, ptr %20, align 8, !tbaa !9
  %22 = call ptr @insertNode(ptr noundef %3, i32 noundef %21)
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.ListNode, ptr %23, i32 0, i32 1
  %25 = load ptr, ptr %24, align 8, !tbaa !12
  store ptr %25, ptr %4, align 8, !tbaa !5
  %26 = load ptr, ptr %4, align 8, !tbaa !5
  %27 = icmp eq ptr %26, null
  br i1 %27, label %28, label %29

28:                                               ; preds = %17
  br label %41

29:                                               ; preds = %17
  %30 = load ptr, ptr %4, align 8, !tbaa !5
  %31 = load ptr, ptr %6, align 8, !tbaa !5
  %32 = call ptr @findPreviousNodeOfTarget(ptr noundef %30, ptr noundef %31)
  store ptr %32, ptr %6, align 8, !tbaa !5
  %33 = load ptr, ptr %6, align 8, !tbaa !5
  %34 = icmp eq ptr %33, null
  br i1 %34, label %35, label %36

35:                                               ; preds = %29
  br label %41

36:                                               ; preds = %29
  %37 = load ptr, ptr %6, align 8, !tbaa !5
  %38 = getelementptr inbounds %struct.ListNode, ptr %37, i32 0, i32 0
  %39 = load i32, ptr %38, align 8, !tbaa !9
  %40 = call ptr @insertNode(ptr noundef %3, i32 noundef %39)
  br label %8, !llvm.loop !13

41:                                               ; preds = %35, %28, %15
  %42 = load ptr, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret ptr %42
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = { 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/C++ TBAA"}
!9 = !{!10, !11, i64 0}
!10 = !{!"ListNode", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"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"

; 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: nounwind uwtable
declare dso_local ptr @insertNode(ptr noundef, i32 noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
declare dso_local ptr @findPreviousNodeOfTarget(ptr noundef, ptr noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local ptr @formatList(ptr noundef readonly %0) local_unnamed_addr #1 {
  %2 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #2
  store ptr null, ptr %2, align 8, !tbaa !5
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %11
  %.016 = phi ptr [ %9, %11 ], [ null, %1 ]
  %.01215 = phi ptr [ %6, %11 ], [ %0, %1 ]
  %3 = load i32, ptr %.01215, align 8, !tbaa !9
  %4 = call ptr @insertNode(ptr noundef nonnull %2, i32 noundef %3)
  %5 = getelementptr inbounds i8, ptr %.01215, i64 8
  %6 = load ptr, ptr %5, align 8, !tbaa !12
  %7 = icmp eq ptr %6, null
  br i1 %7, label %._crit_edge.loopexit, label %8

8:                                                ; preds = %.lr.ph
  %9 = call ptr @findPreviousNodeOfTarget(ptr noundef nonnull %6, ptr noundef %.016)
  %10 = icmp eq ptr %9, null
  br i1 %10, label %._crit_edge.loopexit, label %11

11:                                               ; preds = %8
  %12 = load i32, ptr %9, align 8, !tbaa !9
  %13 = call ptr @insertNode(ptr noundef nonnull %2, i32 noundef %12)
  %.not19 = icmp eq ptr %6, %9
  br i1 %.not19, label %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !13

._crit_edge.loopexit:                             ; preds = %8, %.lr.ph, %11
  %.pre = load ptr, ptr %2, align 8, !tbaa !5
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %1
  %14 = phi ptr [ %.pre, %._crit_edge.loopexit ], [ null, %1 ]
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #2
  ret ptr %14
}

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = { 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/C++ TBAA"}
!9 = !{!10, !11, i64 0}
!10 = !{!"ListNode", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass