; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 11. Stack (stack)

; 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
@stack = external dso_local global [10 x i32], align 16
@.str.11 = external hidden unnamed_addr constant [16 x i8], align 1
@.str.12 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.13 = external hidden unnamed_addr constant [2 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
declare dso_local i32 @isEmpty() #2

; Function Attrs: noreturn nounwind
declare void @exit(i32 noundef) #3

; Function Attrs: nounwind uwtable
define dso_local void @display() #2 {
  %1 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #4
  %2 = call i32 @isEmpty()
  %3 = icmp ne i32 %2, 0
  br i1 %3, label %4, label %6

4:                                                ; preds = %0
  %5 = call i32 (ptr, ...) @printf(ptr noundef @.str.11)
  call void @exit(i32 noundef 0) #5
  unreachable

6:                                                ; preds = %0
  store i32 0, ptr %1, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %19, %6
  %8 = load i32, ptr %1, align 4, !tbaa !5
  %9 = load i32, ptr @top, align 4, !tbaa !5
  %10 = icmp sle i32 %8, %9
  br i1 %10, label %11, label %22

11:                                               ; preds = %7
  %12 = load i32, ptr @top, align 4, !tbaa !5
  %13 = load i32, ptr %1, align 4, !tbaa !5
  %14 = sub nsw i32 %12, %13
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [10 x i32], ptr @stack, i64 0, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = call i32 (ptr, ...) @printf(ptr noundef @.str.12, i32 noundef %17)
  br label %19

19:                                               ; preds = %11
  %20 = load i32, ptr %1, align 4, !tbaa !5
  %21 = add nsw i32 %20, 1
  store i32 %21, ptr %1, align 4, !tbaa !5
  br label %7, !llvm.loop !9

22:                                               ; preds = %7
  %23 = call i32 (ptr, ...) @printf(ptr noundef @.str.13)
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #4
  ret void
}

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 = { noreturn 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 #4 = { nounwind }
attributes #5 = { noreturn 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"

@top = external dso_local local_unnamed_addr global i32, align 4
@stack = external dso_local local_unnamed_addr global [10 x i32], align 16
@.str.11 = external hidden unnamed_addr constant [16 x i8], align 1
@.str.12 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.13 = external hidden unnamed_addr constant [2 x i8], align 1

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

; Function Attrs: nounwind uwtable
declare dso_local i32 @isEmpty() local_unnamed_addr #1

; Function Attrs: noreturn nounwind
declare void @exit(i32 noundef) local_unnamed_addr #2

; Function Attrs: nounwind uwtable
define dso_local void @display() local_unnamed_addr #1 {
  %1 = tail call i32 @isEmpty()
  %.not = icmp eq i32 %1, 0
  br i1 %.not, label %.preheader, label %3

.preheader:                                       ; preds = %0
  %2 = load i32, ptr @top, align 4, !tbaa !5
  %.not45 = icmp slt i32 %2, 0
  br i1 %.not45, label %._crit_edge, label %.lr.ph

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

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %5 = phi i32 [ %12, %.lr.ph ], [ %2, %.preheader ]
  %.06 = phi i32 [ %11, %.lr.ph ], [ 0, %.preheader ]
  %6 = sub nsw i32 %5, %.06
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds [10 x i32], ptr @stack, i64 0, i64 %7
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.12, i32 noundef %9)
  %11 = add nuw nsw i32 %.06, 1
  %12 = load i32, ptr @top, align 4, !tbaa !5
  %.not4.not = icmp slt i32 %.06, %12
  br i1 %.not4.not, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %.preheader
  %13 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.13)
  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 = { 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 #2 = { noreturn 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 = { noreturn 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"}


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