; LLVM IR from ahampriyanshu/algo-ds-101 :: Data-Structures/Stack (StackUsingArray)

; 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
@.str.24 = external hidden unnamed_addr constant [34 x i8], align 1
@.str.25 = external hidden unnamed_addr constant [59 x i8], align 1

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

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

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

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

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

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

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

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

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

; 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
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  call void @instructions()
  br label %4

4:                                                ; preds = %19, %0
  %5 = call i32 (ptr, ...) @printf(ptr noundef @.str.24)
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.2, ptr noundef %2)
  %7 = load i32, ptr %2, align 4, !tbaa !5
  switch i32 %7, label %16 [
    i32 1, label %8
    i32 2, label %9
    i32 3, label %10
    i32 4, label %11
    i32 5, label %12
    i32 6, label %13
    i32 7, label %14
    i32 8, label %15
  ]

8:                                                ; preds = %4
  call void @push()
  br label %18

9:                                                ; preds = %4
  call void @pop()
  br label %18

10:                                               ; preds = %4
  call void @display()
  br label %18

11:                                               ; preds = %4
  call void @topmost()
  br label %18

12:                                               ; preds = %4
  call void @seek()
  br label %18

13:                                               ; preds = %4
  call void @isEmpty()
  br label %18

14:                                               ; preds = %4
  call void @clear()
  br label %18

15:                                               ; preds = %4
  store i32 0, ptr %1, align 4
  store i32 1, ptr %3, align 4
  br label %21

16:                                               ; preds = %4
  %17 = call i32 (ptr, ...) @printf(ptr noundef @.str.25)
  call void @instructions()
  br label %18

18:                                               ; preds = %16, %14, %13, %12, %11, %10, %9, %8
  br label %19

19:                                               ; preds = %18
  br i1 true, label %4, label %20

20:                                               ; preds = %19
  store i32 0, ptr %1, align 4
  store i32 1, ptr %3, align 4
  br label %21

21:                                               ; preds = %20, %15
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  %22 = load i32, ptr %1, align 4
  ret i32 %22
}

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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; 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.2 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.24 = external hidden unnamed_addr constant [34 x i8], align 1
@.str.25 = external hidden unnamed_addr constant [59 x i8], align 1

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

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

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

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

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

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

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

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

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #3
  tail call void @instructions()
  br label %2

2:                                                ; preds = %.backedge, %0
  %3 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.24)
  %4 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.2, ptr noundef nonnull %1)
  %5 = load i32, ptr %1, align 4, !tbaa !5
  switch i32 %5, label %14 [
    i32 1, label %6
    i32 2, label %7
    i32 3, label %8
    i32 4, label %9
    i32 5, label %10
    i32 6, label %11
    i32 7, label %12
    i32 8, label %13
  ]

6:                                                ; preds = %2
  call void @push()
  br label %.backedge

.backedge:                                        ; preds = %6, %7, %8, %9, %10, %11, %12, %14
  br label %2

7:                                                ; preds = %2
  call void @pop()
  br label %.backedge

8:                                                ; preds = %2
  call void @display()
  br label %.backedge

9:                                                ; preds = %2
  call void @topmost()
  br label %.backedge

10:                                               ; preds = %2
  call void @seek()
  br label %.backedge

11:                                               ; preds = %2
  call void @isEmpty()
  br label %.backedge

12:                                               ; preds = %2
  call void @clear()
  br label %.backedge

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

14:                                               ; preds = %2
  %15 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.25)
  call void @instructions()
  br label %.backedge
}

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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass