; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 10. Linked List/c lang (all_func)

; 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 }

@head = external dso_local global ptr, align 8
@.str.2 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [20 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [16 x i8], align 1
@temp = external dso_local global ptr, align 8

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

declare i32 @printf(ptr noundef, ...) #1

declare i32 @__isoc99_scanf(ptr noundef, ...) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @create() #2 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #4
  %5 = call i32 (ptr, ...) @printf(ptr noundef @.str.4)
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.2, ptr noundef %2)
  %7 = load i32, ptr %2, align 4, !tbaa !5
  %8 = icmp eq i32 %7, 0
  br i1 %8, label %9, label %10

9:                                                ; preds = %0
  store i32 0, ptr %1, align 4
  store i32 1, ptr %3, align 4
  br label %38

10:                                               ; preds = %0
  br label %11

11:                                               ; preds = %31, %10
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = icmp sgt i32 %12, 0
  br i1 %13, label %14, label %36

14:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #4
  %15 = call noalias ptr @malloc(i64 noundef 16) #5
  store ptr %15, ptr %4, align 8, !tbaa !9
  %16 = call i32 (ptr, ...) @printf(ptr noundef @.str.5)
  %17 = load ptr, ptr %4, align 8, !tbaa !9
  %18 = getelementptr inbounds %struct.node, ptr %17, i32 0, i32 0
  %19 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.2, ptr noundef %18)
  %20 = load ptr, ptr %4, align 8, !tbaa !9
  %21 = getelementptr inbounds %struct.node, ptr %20, i32 0, i32 1
  store ptr null, ptr %21, align 8, !tbaa !11
  %22 = load ptr, ptr @head, align 8, !tbaa !9
  %23 = icmp eq ptr %22, null
  br i1 %23, label %24, label %26

24:                                               ; preds = %14
  %25 = load ptr, ptr %4, align 8, !tbaa !9
  store ptr %25, ptr @temp, align 8, !tbaa !9
  store ptr %25, ptr @head, align 8, !tbaa !9
  br label %31

26:                                               ; preds = %14
  %27 = load ptr, ptr %4, align 8, !tbaa !9
  %28 = load ptr, ptr @temp, align 8, !tbaa !9
  %29 = getelementptr inbounds %struct.node, ptr %28, i32 0, i32 1
  store ptr %27, ptr %29, align 8, !tbaa !11
  %30 = load ptr, ptr %4, align 8, !tbaa !9
  store ptr %30, ptr @temp, align 8, !tbaa !9
  br label %31

31:                                               ; preds = %26, %24
  %32 = load ptr, ptr @temp, align 8, !tbaa !9
  %33 = getelementptr inbounds %struct.node, ptr %32, i32 0, i32 1
  store ptr null, ptr %33, align 8, !tbaa !11
  %34 = load i32, ptr %2, align 4, !tbaa !5
  %35 = add nsw i32 %34, -1
  store i32 %35, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #4
  br label %11, !llvm.loop !13

36:                                               ; preds = %11
  br label %37

37:                                               ; preds = %36
  store i32 0, ptr %3, align 4
  br label %38

38:                                               ; preds = %37, %9
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #4
  %39 = load i32, ptr %3, align 4
  switch i32 %39, label %42 [
    i32 0, label %40
    i32 1, label %40
  ]

40:                                               ; preds = %38, %38
  %41 = load i32, ptr %1, align 4
  ret i32 %41

42:                                               ; preds = %38
  unreachable
}

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

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

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { "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 = { 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, !10, i64 8}
!12 = !{!"node", !6, i64 0, !10, 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"

@head = external dso_local local_unnamed_addr global ptr, align 8
@.str.2 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [20 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [16 x i8], align 1
@temp = external dso_local local_unnamed_addr global ptr, align 8

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

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: nofree nounwind uwtable
define dso_local noundef i32 @create() local_unnamed_addr #2 {
  %1 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #4
  %2 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.4)
  %3 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.2, ptr noundef nonnull %1)
  %4 = load i32, ptr %1, align 4
  %5 = icmp sgt i32 %4, 0
  br i1 %5, label %.preheader, label %.loopexit

.preheader:                                       ; preds = %0, %.preheader
  %6 = call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #5
  %7 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.5)
  %8 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.2, ptr noundef %6)
  %9 = getelementptr inbounds i8, ptr %6, i64 8
  %10 = load ptr, ptr @head, align 8, !tbaa !5
  %11 = icmp eq ptr %10, null
  %12 = load ptr, ptr @temp, align 8
  %13 = getelementptr inbounds i8, ptr %12, i64 8
  %.sink = select i1 %11, ptr @head, ptr %13
  store ptr %6, ptr %.sink, align 8, !tbaa !5
  store ptr %6, ptr @temp, align 8
  store ptr null, ptr %9, align 8, !tbaa !9
  %14 = load i32, ptr %1, align 4, !tbaa !12
  %15 = add nsw i32 %14, -1
  store i32 %15, ptr %1, align 4, !tbaa !12
  %.old5 = icmp sgt i32 %14, 1
  br i1 %.old5, label %.preheader, label %.loopexit

.loopexit:                                        ; preds = %.preheader, %0
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #4
  ret i32 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: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #3

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


; Effective O3 passes: DSEPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopSimplifyPass,LoopUnrollPass,MergedLoadStoreMotionPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass