; LLVM IR from VAR-solutions/Algorithms :: data structures/linked list/c (DoublyLinkedList)

; 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 { i32, ptr, ptr }

@.str = external hidden unnamed_addr constant [18 x i8], align 1

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

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #1

; 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 void @insertNode_beg(ptr noundef, i32 noundef) #2

; Function Attrs: nounwind uwtable
define dso_local void @insertNode_bet(ptr noundef %0, i32 noundef %1, i32 noundef %2) #2 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #4
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %10, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %11 = call noalias ptr @malloc(i64 noundef 24) #5
  store ptr %11, ptr %8, align 8, !tbaa !5
  %12 = load ptr, ptr %7, align 8, !tbaa !5
  %13 = icmp ne ptr %12, null
  br i1 %13, label %14, label %23

14:                                               ; preds = %3
  %15 = load ptr, ptr %7, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.Node, ptr %15, i32 0, i32 0
  %17 = load i32, ptr %16, align 8, !tbaa !11
  %18 = load i32, ptr %5, align 4, !tbaa !9
  %19 = icmp eq i32 %17, %18
  br i1 %19, label %20, label %23

20:                                               ; preds = %14
  %21 = load ptr, ptr %4, align 8, !tbaa !5
  %22 = load i32, ptr %6, align 4, !tbaa !9
  call void @insertNode_beg(ptr noundef %21, i32 noundef %22)
  store i32 1, ptr %9, align 4
  br label %64

23:                                               ; preds = %14, %3
  br label %24

24:                                               ; preds = %35, %23
  %25 = load ptr, ptr %7, align 8, !tbaa !5
  %26 = icmp ne ptr %25, null
  br i1 %26, label %27, label %33

27:                                               ; preds = %24
  %28 = load ptr, ptr %7, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.Node, ptr %28, i32 0, i32 0
  %30 = load i32, ptr %29, align 8, !tbaa !11
  %31 = load i32, ptr %5, align 4, !tbaa !9
  %32 = icmp ne i32 %30, %31
  br label %33

33:                                               ; preds = %27, %24
  %34 = phi i1 [ false, %24 ], [ %32, %27 ]
  br i1 %34, label %35, label %39

35:                                               ; preds = %33
  %36 = load ptr, ptr %7, align 8, !tbaa !5
  %37 = getelementptr inbounds %struct.Node, ptr %36, i32 0, i32 1
  %38 = load ptr, ptr %37, align 8, !tbaa !13
  store ptr %38, ptr %7, align 8, !tbaa !5
  br label %24, !llvm.loop !14

39:                                               ; preds = %33
  %40 = load ptr, ptr %7, align 8, !tbaa !5
  %41 = icmp eq ptr %40, null
  br i1 %41, label %42, label %44

42:                                               ; preds = %39
  %43 = call i32 (ptr, ...) @printf(ptr noundef @.str)
  store i32 1, ptr %9, align 4
  br label %64

44:                                               ; preds = %39
  %45 = load i32, ptr %6, align 4, !tbaa !9
  %46 = load ptr, ptr %8, align 8, !tbaa !5
  %47 = getelementptr inbounds %struct.Node, ptr %46, i32 0, i32 0
  store i32 %45, ptr %47, align 8, !tbaa !11
  %48 = load ptr, ptr %7, align 8, !tbaa !5
  %49 = load ptr, ptr %8, align 8, !tbaa !5
  %50 = getelementptr inbounds %struct.Node, ptr %49, i32 0, i32 1
  store ptr %48, ptr %50, align 8, !tbaa !13
  %51 = load ptr, ptr %7, align 8, !tbaa !5
  %52 = getelementptr inbounds %struct.Node, ptr %51, i32 0, i32 2
  %53 = load ptr, ptr %52, align 8, !tbaa !16
  %54 = load ptr, ptr %8, align 8, !tbaa !5
  %55 = getelementptr inbounds %struct.Node, ptr %54, i32 0, i32 2
  store ptr %53, ptr %55, align 8, !tbaa !16
  %56 = load ptr, ptr %8, align 8, !tbaa !5
  %57 = load ptr, ptr %7, align 8, !tbaa !5
  %58 = getelementptr inbounds %struct.Node, ptr %57, i32 0, i32 2
  %59 = load ptr, ptr %58, align 8, !tbaa !16
  %60 = getelementptr inbounds %struct.Node, ptr %59, i32 0, i32 1
  store ptr %56, ptr %60, align 8, !tbaa !13
  %61 = load ptr, ptr %8, align 8, !tbaa !5
  %62 = load ptr, ptr %7, align 8, !tbaa !5
  %63 = getelementptr inbounds %struct.Node, ptr %62, i32 0, i32 2
  store ptr %61, ptr %63, align 8, !tbaa !16
  store i32 0, ptr %9, align 4
  br label %64

64:                                               ; preds = %44, %42, %20
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #4
  %65 = load i32, ptr %9, align 4
  switch i32 %65, label %67 [
    i32 0, label %66
    i32 1, label %66
  ]

66:                                               ; preds = %64, %64
  ret void

67:                                               ; preds = %64
  unreachable
}

declare i32 @printf(ptr noundef, ...) #3

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind allocsize(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 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 = { "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 #4 = { nounwind }
attributes #5 = { nounwind allocsize(0) }

!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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"Node", !10, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!12, !6, i64 8}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}
!16 = !{!12, !6, i64 16}


; 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"

@.str = external hidden unnamed_addr constant [18 x i8], align 1

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local void @insertNode_beg(ptr noundef, i32 noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local void @insertNode_bet(ptr noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #1 {
  %4 = tail call noalias dereferenceable_or_null(24) ptr @malloc(i64 noundef 24) #3
  %cond26 = icmp eq ptr %0, null
  br i1 %cond26, label %._crit_edge, label %5

5:                                                ; preds = %3
  %6 = load i32, ptr %0, align 8, !tbaa !5
  %7 = icmp eq i32 %6, %1
  br i1 %7, label %8, label %.lr.ph

8:                                                ; preds = %5
  tail call void @insertNode_beg(ptr noundef nonnull %0, i32 noundef %2)
  br label %19

.lr.ph:                                           ; preds = %5, %10
  %.025 = phi ptr [ %12, %10 ], [ %0, %5 ]
  %9 = load i32, ptr %.025, align 8, !tbaa !5
  %.not22 = icmp eq i32 %9, %1
  br i1 %.not22, label %.critedge, label %10

10:                                               ; preds = %.lr.ph
  %11 = getelementptr inbounds i8, ptr %.025, i64 8
  %12 = load ptr, ptr %11, align 8, !tbaa !11
  %cond = icmp eq ptr %12, null
  br i1 %cond, label %._crit_edge, label %.lr.ph, !llvm.loop !12

._crit_edge:                                      ; preds = %10, %3
  %13 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str)
  br label %19

.critedge:                                        ; preds = %.lr.ph
  store i32 %2, ptr %4, align 8, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %4, i64 8
  store ptr %.025, ptr %14, align 8, !tbaa !11
  %15 = getelementptr inbounds i8, ptr %.025, i64 16
  %16 = load ptr, ptr %15, align 8, !tbaa !14
  %17 = getelementptr inbounds i8, ptr %4, i64 16
  store ptr %16, ptr %17, align 8, !tbaa !14
  %18 = getelementptr inbounds i8, ptr %16, i64 8
  store ptr %4, ptr %18, align 8, !tbaa !11
  store ptr %4, ptr %15, align 8, !tbaa !14
  br label %19

19:                                               ; preds = %.critedge, %._crit_edge, %8
  ret void
}

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

attributes #0 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { 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 = { nofree nounwind "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 = { nounwind allocsize(0) }

!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 = !{!"Node", !7, i64 0, !10, i64 8, !10, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !10, i64 8}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = !{!6, !10, i64 16}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SCCPPass,SROAPass,SimplifyCFGPass,TailCallElimPass