; 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"

@top = external dso_local global i32, align 4
@st = external dso_local global [100 x i32], align 16
@.str.4 = external hidden unnamed_addr constant [20 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [37 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

; 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
define dso_local void @pop() #2 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  %3 = load i32, ptr @top, align 4, !tbaa !5
  %4 = icmp slt i32 %3, 0
  br i1 %4, label %5, label %7

5:                                                ; preds = %0
  %6 = call i32 (ptr, ...) @printf(ptr noundef @.str.4)
  store i32 1, ptr %2, align 4
  br label %16

7:                                                ; preds = %0
  %8 = load i32, ptr @top, align 4, !tbaa !5
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds [100 x i32], ptr @st, i64 0, i64 %9
  %11 = load i32, ptr %10, align 4, !tbaa !5
  store i32 %11, ptr %1, align 4, !tbaa !5
  %12 = load i32, ptr @top, align 4, !tbaa !5
  %13 = add nsw i32 %12, -1
  store i32 %13, ptr @top, align 4, !tbaa !5
  %14 = load i32, ptr %1, align 4, !tbaa !5
  %15 = call i32 (ptr, ...) @printf(ptr noundef @.str.5, i32 noundef %14)
  store i32 0, ptr %2, align 4
  br label %16

16:                                               ; preds = %7, %5
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  %17 = load i32, ptr %2, align 4
  switch i32 %17, label %19 [
    i32 0, label %18
    i32 1, label %18
  ]

18:                                               ; preds = %16, %16
  ret void

19:                                               ; preds = %16
  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"}


; 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"

@top = external dso_local local_unnamed_addr global i32, align 4
@st = external dso_local local_unnamed_addr global [100 x i32], align 16
@.str.4 = external hidden unnamed_addr constant [20 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [37 x i8], align 1

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #0

; Function Attrs: nofree nounwind uwtable
define dso_local void @pop() local_unnamed_addr #1 {
  %1 = load i32, ptr @top, align 4, !tbaa !5
  %2 = icmp slt i32 %1, 0
  br i1 %2, label %3, label %5

3:                                                ; preds = %0
  %4 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.4)
  br label %11

5:                                                ; preds = %0
  %6 = zext nneg i32 %1 to i64
  %7 = getelementptr inbounds [100 x i32], ptr @st, i64 0, i64 %6
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %9 = add nsw i32 %1, -1
  store i32 %9, ptr @top, align 4, !tbaa !5
  %10 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.5, i32 noundef %8)
  br label %11

11:                                               ; preds = %5, %3
  ret void
}

attributes #0 = { 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 #1 = { 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" }

!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: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass