; LLVM IR from VAR-solutions/Algorithms :: data structures/stack/c (stack_in_c)

; 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.stack = type { [5 x i32], i32 }

@s = external dso_local global %struct.stack, align 4
@.str = external hidden unnamed_addr constant [17 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [44 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [39 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [38 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [42 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [35 x i8], align 1
@.str.6 = external hidden unnamed_addr constant [19 x i8], align 1
@.str.7 = external hidden unnamed_addr constant [3 x i8], align 1
@stdin = external global ptr, align 8
@.str.8 = external hidden unnamed_addr constant [39 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local void @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  store i32 1, ptr %2, align 4, !tbaa !5
  store i32 -1, ptr getelementptr inbounds (%struct.stack, ptr @s, i32 0, i32 1), align 4, !tbaa !9
  %4 = call i32 (ptr, ...) @printf(ptr noundef @.str)
  br label %5

5:                                                ; preds = %23, %0
  %6 = load i32, ptr %2, align 4, !tbaa !5
  %7 = icmp ne i32 %6, 0
  br i1 %7, label %8, label %28

8:                                                ; preds = %5
  %9 = call i32 (ptr, ...) @printf(ptr noundef @.str.1)
  %10 = call i32 (ptr, ...) @printf(ptr noundef @.str.2)
  %11 = call i32 (ptr, ...) @printf(ptr noundef @.str.3)
  %12 = call i32 (ptr, ...) @printf(ptr noundef @.str.4)
  %13 = call i32 (ptr, ...) @printf(ptr noundef @.str.5)
  %14 = call i32 (ptr, ...) @printf(ptr noundef @.str.1)
  %15 = call i32 (ptr, ...) @printf(ptr noundef @.str.6)
  %16 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.7, ptr noundef %1)
  %17 = load i32, ptr %1, align 4, !tbaa !5
  switch i32 %17, label %23 [
    i32 1, label %18
    i32 2, label %19
    i32 3, label %21
    i32 4, label %22
  ]

18:                                               ; preds = %8
  call void @push()
  br label %23

19:                                               ; preds = %8
  %20 = call i32 @pop()
  br label %23

21:                                               ; preds = %8
  call void @display()
  br label %23

22:                                               ; preds = %8
  store i32 1, ptr %3, align 4
  br label %29

23:                                               ; preds = %21, %19, %18, %8
  %24 = load ptr, ptr @stdin, align 8, !tbaa !11
  %25 = call i32 @fflush(ptr noundef %24)
  %26 = call i32 (ptr, ...) @printf(ptr noundef @.str.8)
  %27 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.7, ptr noundef %2)
  br label %5, !llvm.loop !13

28:                                               ; preds = %5
  store i32 0, ptr %3, align 4
  br label %29

29:                                               ; preds = %28, %22
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  %30 = load i32, ptr %3, align 4
  switch i32 %30, label %32 [
    i32 0, label %31
    i32 1, label %31
  ]

31:                                               ; preds = %29, %29
  ret void

32:                                               ; preds = %29
  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

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

; Function Attrs: nounwind uwtable
declare dso_local i32 @pop() #0

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

declare i32 @fflush(ptr noundef) #2

; 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !6, i64 20}
!10 = !{!"stack", !7, i64 0, !6, i64 20}
!11 = !{!12, !12, i64 0}
!12 = !{!"any pointer", !7, i64 0}
!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"

%struct.stack = type { [5 x i32], i32 }

@s = external dso_local local_unnamed_addr global %struct.stack, align 4
@.str = external hidden unnamed_addr constant [17 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [44 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [39 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [38 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [42 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [35 x i8], align 1
@.str.6 = external hidden unnamed_addr constant [19 x i8], align 1
@.str.7 = external hidden unnamed_addr constant [3 x i8], align 1
@stdin = external local_unnamed_addr global ptr, align 8
@.str.8 = external hidden unnamed_addr constant [39 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local void @main() local_unnamed_addr #0 {
.lr.ph.preheader:
  %0 = alloca i32, align 4
  %1 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %0) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #3
  store i32 1, ptr %1, align 4, !tbaa !5
  store i32 -1, ptr getelementptr inbounds (i8, ptr @s, i64 20), align 4, !tbaa !9
  %2 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str)
  br label %.lr.ph

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

12:                                               ; preds = %.lr.ph
  call void @push()
  br label %16

13:                                               ; preds = %.lr.ph
  %14 = call i32 @pop()
  br label %16

15:                                               ; preds = %.lr.ph
  call void @display()
  br label %16

16:                                               ; preds = %15, %13, %12, %.lr.ph
  %17 = load ptr, ptr @stdin, align 8, !tbaa !11
  %18 = call i32 @fflush(ptr noundef %17)
  %19 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.8)
  %20 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.7, ptr noundef nonnull %1)
  %21 = load i32, ptr %1, align 4, !tbaa !5
  %.not = icmp eq i32 %21, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph, %16
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %0) #3
  ret void
}

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

; Function Attrs: nounwind uwtable
declare dso_local i32 @pop() local_unnamed_addr #0

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

; Function Attrs: nofree nounwind
declare noundef i32 @fflush(ptr nocapture noundef) 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

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"}
!9 = !{!10, !6, i64 20}
!10 = !{!"stack", !7, i64 0, !6, i64 20}
!11 = !{!12, !12, i64 0}
!12 = !{!"any pointer", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,SCCPPass,SROAPass,SimplifyCFGPass,TailCallElimPass