; LLVM IR from MinhasKamal/AlgorithmImplementations :: dataStructures/stack (StackImplementation)

; 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 = external hidden unnamed_addr constant [79 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@stdin = external global ptr, align 8

; Function Attrs: nounwind uwtable
define dso_local i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  br label %4

4:                                                ; preds = %26, %0
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  %5 = call i32 (ptr, ...) @printf(ptr noundef @.str)
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef %2)
  %7 = load ptr, ptr @stdin, align 8, !tbaa !5
  %8 = call i32 @fflush(ptr noundef %7)
  %9 = load i32, ptr %2, align 4, !tbaa !9
  %10 = icmp eq i32 %9, 1
  br i1 %10, label %11, label %12

11:                                               ; preds = %4
  call void @stack_size()
  br label %23

12:                                               ; preds = %4
  %13 = load i32, ptr %2, align 4, !tbaa !9
  %14 = icmp eq i32 %13, 2
  br i1 %14, label %15, label %16

15:                                               ; preds = %12
  call void @stack_pop()
  br label %22

16:                                               ; preds = %12
  %17 = load i32, ptr %2, align 4, !tbaa !9
  %18 = icmp eq i32 %17, 3
  br i1 %18, label %19, label %20

19:                                               ; preds = %16
  call void @stack_push()
  br label %21

20:                                               ; preds = %16
  store i32 2, ptr %3, align 4
  br label %24

21:                                               ; preds = %19
  br label %22

22:                                               ; preds = %21, %15
  br label %23

23:                                               ; preds = %22, %11
  store i32 0, ptr %3, align 4
  br label %24

24:                                               ; preds = %23, %20
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  %25 = load i32, ptr %3, align 4
  switch i32 %25, label %28 [
    i32 0, label %26
    i32 2, label %27
  ]

26:                                               ; preds = %24
  br label %4

27:                                               ; preds = %24
  ret i32 0

28:                                               ; preds = %24
  unreachable
}

; 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

declare i32 @fflush(ptr noundef) #2

; Function Attrs: nounwind uwtable
declare dso_local void @stack_size() #0

; Function Attrs: nounwind uwtable
declare dso_local void @stack_pop() #0

; Function Attrs: nounwind uwtable
declare dso_local void @stack_push() #0

; 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 }

!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}


; 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 [79 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@stdin = external local_unnamed_addr global ptr, align 8

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca i32, align 4
  br label %2

2:                                                ; preds = %11, %0
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #3
  %3 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str)
  %4 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull %1)
  %5 = load ptr, ptr @stdin, align 8, !tbaa !5
  %6 = call i32 @fflush(ptr noundef %5)
  %7 = load i32, ptr %1, align 4, !tbaa !9
  switch i32 %7, label %12 [
    i32 1, label %8
    i32 2, label %9
    i32 3, label %10
  ]

8:                                                ; preds = %2
  call void @stack_size()
  br label %11

9:                                                ; preds = %2
  call void @stack_pop()
  br label %11

10:                                               ; preds = %2
  call void @stack_push()
  br label %11

11:                                               ; preds = %8, %10, %9
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #3
  br label %2

12:                                               ; preds = %2
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #3
  ret i32 0
}

; 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: nofree nounwind
declare noundef i32 @fflush(ptr nocapture noundef) local_unnamed_addr #2

; Function Attrs: nounwind uwtable
declare dso_local void @stack_size() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local void @stack_pop() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local void @stack_push() local_unnamed_addr #0

; Function Attrs: mustprogress 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 = { 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 = { 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, !10, i64 0}
!10 = !{!"int", !7, i64 0}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass