; LLVM IR from HarshCasper/NeoAlgo :: C/ds (StackUsingQueue)

; 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"

@qsize = external dso_local global i32, align 4
@.str = external hidden unnamed_addr constant [17 x i8], align 1

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

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

; 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 i32 @deQueue() #0

; Function Attrs: nounwind uwtable
define dso_local i32 @pop() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %2, align 4, !tbaa !5
  br label %5

5:                                                ; preds = %14, %0
  %6 = load i32, ptr %2, align 4, !tbaa !5
  %7 = load i32, ptr @qsize, align 4, !tbaa !5
  %8 = sub nsw i32 %7, 1
  %9 = icmp slt i32 %6, %8
  br i1 %9, label %10, label %17

10:                                               ; preds = %5
  %11 = call i32 @deQueue()
  store i32 %11, ptr %3, align 4, !tbaa !5
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = call i32 @enQueue(i32 noundef %12)
  br label %14

14:                                               ; preds = %10
  %15 = load i32, ptr %2, align 4, !tbaa !5
  %16 = add nsw i32 %15, 1
  store i32 %16, ptr %2, align 4, !tbaa !5
  br label %5, !llvm.loop !9

17:                                               ; preds = %5
  %18 = call i32 @deQueue()
  store i32 %18, ptr %3, align 4, !tbaa !5
  %19 = load i32, ptr %3, align 4, !tbaa !5
  %20 = icmp eq i32 %19, -1
  br i1 %20, label %21, label %23

21:                                               ; preds = %17
  %22 = call i32 (ptr, ...) @printf(ptr noundef @.str)
  store i32 0, ptr %1, align 4
  store i32 1, ptr %4, align 4
  br label %25

23:                                               ; preds = %17
  %24 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %24, ptr %1, align 4
  store i32 1, ptr %4, align 4
  br label %25

25:                                               ; preds = %23, %21
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  %26 = load i32, ptr %1, align 4
  ret i32 %26
}

declare i32 @printf(ptr noundef, ...) #2

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 = distinct !{!9, !10}
!10 = !{!"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"

@qsize = external dso_local local_unnamed_addr global i32, align 4
@.str = external hidden unnamed_addr constant [17 x i8], align 1

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

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

; Function Attrs: nounwind uwtable
define dso_local range(i32 0, -1) i32 @pop() local_unnamed_addr #0 {
  %1 = load i32, ptr @qsize, align 4, !tbaa !5
  %2 = icmp sgt i32 %1, 1
  br i1 %2, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %0, %.lr.ph
  %.08 = phi i32 [ %5, %.lr.ph ], [ 0, %0 ]
  %3 = tail call i32 @deQueue()
  %4 = tail call i32 @enQueue(i32 noundef %3)
  %5 = add nuw nsw i32 %.08, 1
  %6 = load i32, ptr @qsize, align 4, !tbaa !5
  %7 = add nsw i32 %6, -1
  %8 = icmp slt i32 %5, %7
  br i1 %8, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %0
  %9 = tail call i32 @deQueue()
  %10 = icmp eq i32 %9, -1
  br i1 %10, label %11, label %13

11:                                               ; preds = %._crit_edge
  %12 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str)
  br label %13

13:                                               ; preds = %._crit_edge, %11
  %.06 = phi i32 [ 0, %11 ], [ %9, %._crit_edge ]
  ret i32 %.06
}

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

!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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass