; LLVM IR from hanzohasashi33/Competetive_programming :: Snippets/DSA_PROBLEMS/Linked_List (delete_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.node = type { i32, ptr }

@.str = external hidden unnamed_addr constant [18 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local ptr @createlinkedlist(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #4
  store ptr null, ptr %3, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #4
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #4
  store i32 0, ptr %6, align 4, !tbaa !5
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %41, %1
  %9 = load i32, ptr %6, align 4, !tbaa !5
  %10 = load i32, ptr %2, align 4, !tbaa !5
  %11 = icmp slt i32 %9, %10
  br i1 %11, label %12, label %44

12:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  %13 = call i32 (ptr, ...) @printf(ptr noundef @.str)
  %14 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef %7)
  %15 = call noalias ptr @malloc(i64 noundef 16) #5
  store ptr %15, ptr %4, align 8, !tbaa !9
  %16 = load i32, ptr %7, align 4, !tbaa !5
  %17 = load ptr, ptr %4, align 8, !tbaa !9
  %18 = getelementptr inbounds %struct.node, ptr %17, i32 0, i32 0
  store i32 %16, ptr %18, align 8, !tbaa !11
  %19 = load ptr, ptr %4, align 8, !tbaa !9
  %20 = getelementptr inbounds %struct.node, ptr %19, i32 0, i32 1
  store ptr null, ptr %20, align 8, !tbaa !13
  %21 = load ptr, ptr %3, align 8, !tbaa !9
  %22 = icmp eq ptr %21, null
  br i1 %22, label %23, label %25

23:                                               ; preds = %12
  %24 = load ptr, ptr %4, align 8, !tbaa !9
  store ptr %24, ptr %3, align 8, !tbaa !9
  br label %40

25:                                               ; preds = %12
  %26 = load ptr, ptr %3, align 8, !tbaa !9
  store ptr %26, ptr %5, align 8, !tbaa !9
  br label %27

27:                                               ; preds = %32, %25
  %28 = load ptr, ptr %5, align 8, !tbaa !9
  %29 = getelementptr inbounds %struct.node, ptr %28, i32 0, i32 1
  %30 = load ptr, ptr %29, align 8, !tbaa !13
  %31 = icmp ne ptr %30, null
  br i1 %31, label %32, label %36

32:                                               ; preds = %27
  %33 = load ptr, ptr %5, align 8, !tbaa !9
  %34 = getelementptr inbounds %struct.node, ptr %33, i32 0, i32 1
  %35 = load ptr, ptr %34, align 8, !tbaa !13
  store ptr %35, ptr %5, align 8, !tbaa !9
  br label %27, !llvm.loop !14

36:                                               ; preds = %27
  %37 = load ptr, ptr %4, align 8, !tbaa !9
  %38 = load ptr, ptr %5, align 8, !tbaa !9
  %39 = getelementptr inbounds %struct.node, ptr %38, i32 0, i32 1
  store ptr %37, ptr %39, align 8, !tbaa !13
  br label %40

40:                                               ; preds = %36, %23
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  br label %41

41:                                               ; preds = %40
  %42 = load i32, ptr %6, align 4, !tbaa !5
  %43 = add nsw i32 %42, 1
  store i32 %43, ptr %6, align 4, !tbaa !5
  br label %8, !llvm.loop !16

44:                                               ; preds = %8
  %45 = load ptr, ptr %3, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #4
  ret ptr %45
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare i32 @printf(ptr noundef, ...) #2

declare i32 @__isoc99_scanf(ptr noundef, ...) #2

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #3

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { 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 #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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) "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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !6, i64 0}
!12 = !{!"node", !6, i64 0, !10, i64 8}
!13 = !{!12, !10, i64 8}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}
!16 = distinct !{!16, !15}


; 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
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: nofree nounwind uwtable
define dso_local ptr @createlinkedlist(i32 noundef %0) local_unnamed_addr #0 {
  %2 = alloca i32, align 4
  %3 = icmp sgt i32 %0, 0
  br i1 %3, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %1, %14
  %.016 = phi i32 [ %15, %14 ], [ 0, %1 ]
  %.01315 = phi ptr [ %.1, %14 ], [ null, %1 ]
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #4
  %4 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str)
  %5 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull %2)
  %6 = call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #5
  %7 = load i32, ptr %2, align 4, !tbaa !5
  store i32 %7, ptr %6, align 8, !tbaa !9
  %8 = getelementptr inbounds i8, ptr %6, i64 8
  store ptr null, ptr %8, align 8, !tbaa !12
  %9 = icmp eq ptr %.01315, null
  br i1 %9, label %14, label %.preheader

.preheader:                                       ; preds = %.lr.ph, %.preheader
  %.012 = phi ptr [ %11, %.preheader ], [ %.01315, %.lr.ph ]
  %10 = getelementptr inbounds i8, ptr %.012, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !12
  %.not = icmp eq ptr %11, null
  br i1 %.not, label %12, label %.preheader, !llvm.loop !13

12:                                               ; preds = %.preheader
  %13 = getelementptr inbounds i8, ptr %.012, i64 8
  store ptr %6, ptr %13, align 8, !tbaa !12
  br label %14

14:                                               ; preds = %.lr.ph, %12
  %.1 = phi ptr [ %.01315, %12 ], [ %6, %.lr.ph ]
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #4
  %15 = add nuw nsw i32 %.016, 1
  %exitcond.not = icmp eq i32 %15, %0
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !15

._crit_edge:                                      ; preds = %14, %1
  %.013.lcssa = phi ptr [ null, %1 ], [ %.1, %14 ]
  ret ptr %.013.lcssa
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

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

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #3

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { nofree 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 #1 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { 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 #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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !6, i64 0}
!10 = !{!"node", !6, i64 0, !11, i64 8}
!11 = !{!"any pointer", !7, i64 0}
!12 = !{!10, !11, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = distinct !{!15, !14}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass