; LLVM IR from codemistic/Data-Structures-and-Algorithms :: Stack (stack_implementation_using_array)

; 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 { i32, i32, ptr }

@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [2 x i8], align 1

declare i32 @printf(ptr noundef, ...) #0

; Function Attrs: nounwind uwtable
define dso_local void @Display(i64 %0, ptr %1) #1 {
  %3 = alloca %struct.Stack, align 8
  %4 = alloca i32, align 4
  %5 = getelementptr inbounds { i64, ptr }, ptr %3, i32 0, i32 0
  store i64 %0, ptr %5, align 8
  %6 = getelementptr inbounds { i64, ptr }, ptr %3, i32 0, i32 1
  store ptr %1, ptr %6, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  %7 = getelementptr inbounds %struct.Stack, ptr %3, i32 0, i32 1
  %8 = load i32, ptr %7, align 4, !tbaa !5
  store i32 %8, ptr %4, align 4, !tbaa !11
  br label %9

9:                                                ; preds = %20, %2
  %10 = load i32, ptr %4, align 4, !tbaa !11
  %11 = icmp sge i32 %10, 0
  br i1 %11, label %12, label %23

12:                                               ; preds = %9
  %13 = getelementptr inbounds %struct.Stack, ptr %3, i32 0, i32 2
  %14 = load ptr, ptr %13, align 8, !tbaa !12
  %15 = load i32, ptr %4, align 4, !tbaa !11
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds i32, ptr %14, i64 %16
  %18 = load i32, ptr %17, align 4, !tbaa !11
  %19 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %18)
  br label %20

20:                                               ; preds = %12
  %21 = load i32, ptr %4, align 4, !tbaa !11
  %22 = add nsw i32 %21, -1
  store i32 %22, ptr %4, align 4, !tbaa !11
  br label %9, !llvm.loop !13

23:                                               ; preds = %9
  %24 = call i32 (ptr, ...) @printf(ptr noundef @.str.3)
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

attributes #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 = { 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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, !7, i64 4}
!6 = !{!"Stack", !7, i64 0, !7, i64 4, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!7, !7, i64 0}
!12 = !{!6, !10, i64 8}
!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"

@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.3 = 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: nofree nounwind uwtable
define dso_local void @Display(i64 %0, ptr nocapture readonly %1) local_unnamed_addr #1 {
  %3 = icmp sgt i64 %0, -1
  br i1 %3, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %.sroa.1.0.extract.shift = lshr i64 %0, 32
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv = phi i64 [ %.sroa.1.0.extract.shift, %.lr.ph.preheader ], [ %indvars.iv.next, %.lr.ph ]
  %4 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv
  %5 = load i32, ptr %4, align 4, !tbaa !5
  %6 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i32 noundef %5)
  %indvars.iv.next = add nsw i64 %indvars.iv, -1
  %7 = trunc nuw i64 %indvars.iv to i32
  %8 = icmp sgt i32 %7, 0
  br i1 %8, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %2
  %9 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.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"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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