; LLVM IR from gargarchit/Data_Structure_n_Algorithms :: Linked_List (11_Reverse_Recursion)

; 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"

@.str.2 = external hidden unnamed_addr constant [3 x i8], align 1
@head = external dso_local global ptr, align 8
@.str.6 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.7 = external hidden unnamed_addr constant [25 x i8], align 1
@.str.8 = external hidden unnamed_addr constant [25 x i8], align 1
@.str.9 = external hidden unnamed_addr constant [23 x i8], align 1
@.str.10 = external hidden unnamed_addr constant [23 x i8], align 1
@.str.11 = external hidden unnamed_addr constant [23 x i8], align 1
@.str.12 = external hidden unnamed_addr constant [22 x i8], align 1
@.str.13 = external hidden unnamed_addr constant [17 x i8], align 1
@.str.14 = external hidden unnamed_addr constant [64 x i8], align 1
@.str.15 = external hidden unnamed_addr constant [31 x i8], align 1
@.str.16 = external hidden unnamed_addr constant [22 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

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

declare i32 @__isoc99_scanf(ptr 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 @Insert_front() #2

; Function Attrs: nounwind uwtable
declare dso_local void @Insert_end() #2

; Function Attrs: nounwind uwtable
declare dso_local void @Delete_front() #2

; Function Attrs: nounwind uwtable
declare dso_local void @Delete_end() #2

; Function Attrs: nounwind uwtable
declare dso_local void @Display_LL() #2

; Function Attrs: nounwind uwtable
declare dso_local void @Reverse_Recursion(ptr noundef) #2

; Function Attrs: nounwind uwtable
define dso_local void @main() #2 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  br label %3

3:                                                ; preds = %32, %0
  %4 = load i32, ptr %1, align 4, !tbaa !5
  %5 = icmp ne i32 %4, 0
  br i1 %5, label %6, label %33

6:                                                ; preds = %3
  %7 = call i32 (ptr, ...) @printf(ptr noundef @.str.6)
  %8 = call i32 (ptr, ...) @printf(ptr noundef @.str.7)
  %9 = call i32 (ptr, ...) @printf(ptr noundef @.str.8)
  %10 = call i32 (ptr, ...) @printf(ptr noundef @.str.9)
  %11 = call i32 (ptr, ...) @printf(ptr noundef @.str.10)
  %12 = call i32 (ptr, ...) @printf(ptr noundef @.str.11)
  %13 = call i32 (ptr, ...) @printf(ptr noundef @.str.12)
  %14 = call i32 (ptr, ...) @printf(ptr noundef @.str.13)
  %15 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.2, ptr noundef %1)
  %16 = load i32, ptr %1, align 4, !tbaa !5
  %17 = icmp eq i32 %16, 0
  br i1 %17, label %18, label %20

18:                                               ; preds = %6
  %19 = call i32 (ptr, ...) @printf(ptr noundef @.str.14)
  store i32 1, ptr %2, align 4
  br label %34

20:                                               ; preds = %6
  %21 = load i32, ptr %1, align 4, !tbaa !5
  switch i32 %21, label %30 [
    i32 1, label %22
    i32 2, label %23
    i32 3, label %24
    i32 4, label %25
    i32 5, label %26
    i32 6, label %27
  ]

22:                                               ; preds = %20
  call void @Insert_front()
  call void @Display_LL()
  br label %32

23:                                               ; preds = %20
  call void @Delete_front()
  call void @Display_LL()
  br label %32

24:                                               ; preds = %20
  call void @Insert_end()
  call void @Display_LL()
  br label %32

25:                                               ; preds = %20
  call void @Delete_end()
  call void @Display_LL()
  br label %32

26:                                               ; preds = %20
  call void @Display_LL()
  br label %32

27:                                               ; preds = %20
  %28 = load ptr, ptr @head, align 8, !tbaa !9
  call void @Reverse_Recursion(ptr noundef %28)
  %29 = call i32 (ptr, ...) @printf(ptr noundef @.str.15)
  call void @Display_LL()
  br label %32

30:                                               ; preds = %20
  %31 = call i32 (ptr, ...) @printf(ptr noundef @.str.16)
  br label %32

32:                                               ; preds = %30, %27, %26, %25, %24, %23, %22
  br label %3, !llvm.loop !11

33:                                               ; preds = %3
  store i32 0, ptr %2, align 4
  br label %34

34:                                               ; preds = %33, %18
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  %35 = load i32, ptr %2, align 4
  switch i32 %35, label %37 [
    i32 0, label %36
    i32 1, label %36
  ]

36:                                               ; preds = %34, %34
  ret void

37:                                               ; preds = %34
  unreachable
}

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 }

!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 = distinct !{!11, !12}
!12 = !{!"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 nofree norecurse noreturn nosync nounwind willreturn memory(none) uwtable
define dso_local void @main() local_unnamed_addr #0 {
  unreachable
}

attributes #0 = { mustprogress nofree norecurse noreturn nosync nounwind willreturn memory(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)"}


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