; LLVM IR from div-bargali/Data-Structures-and-Algorithms :: C/Data-Structures/Stack (stack_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"

@top = external dso_local global i32, align 4
@stack = external dso_local global [100 x i32], align 16
@.str.12 = external hidden unnamed_addr constant [26 x i8], align 1
@i = external dso_local global i32, align 4
@.str.13 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.14 = external hidden unnamed_addr constant [20 x i8], align 1
@.str.15 = external hidden unnamed_addr constant [21 x i8], align 1

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

; Function Attrs: nounwind uwtable
define dso_local void @display() #1 {
  %1 = load i32, ptr @top, align 4, !tbaa !5
  %2 = icmp sge i32 %1, 0
  br i1 %2, label %3, label %20

3:                                                ; preds = %0
  %4 = call i32 (ptr, ...) @printf(ptr noundef @.str.12)
  %5 = load i32, ptr @top, align 4, !tbaa !5
  store i32 %5, ptr @i, align 4, !tbaa !5
  br label %6

6:                                                ; preds = %15, %3
  %7 = load i32, ptr @i, align 4, !tbaa !5
  %8 = icmp sge i32 %7, 0
  br i1 %8, label %9, label %18

9:                                                ; preds = %6
  %10 = load i32, ptr @i, align 4, !tbaa !5
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds [100 x i32], ptr @stack, i64 0, i64 %11
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %14 = call i32 (ptr, ...) @printf(ptr noundef @.str.13, i32 noundef %13)
  br label %15

15:                                               ; preds = %9
  %16 = load i32, ptr @i, align 4, !tbaa !5
  %17 = add nsw i32 %16, -1
  store i32 %17, ptr @i, align 4, !tbaa !5
  br label %6, !llvm.loop !9

18:                                               ; preds = %6
  %19 = call i32 (ptr, ...) @printf(ptr noundef @.str.14)
  br label %22

20:                                               ; preds = %0
  %21 = call i32 (ptr, ...) @printf(ptr noundef @.str.15)
  br label %22

22:                                               ; preds = %20, %18
  ret void
}

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" }

!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 [100 x i32], align 16
@.str.12 = external hidden unnamed_addr constant [26 x i8], align 1
@i = external dso_local local_unnamed_addr global i32, align 4
@.str.13 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.14 = external hidden unnamed_addr constant [20 x i8], align 1
@.str.15 = external hidden unnamed_addr constant [21 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() local_unnamed_addr #1 {
  %1 = load i32, ptr @top, align 4, !tbaa !5
  %2 = icmp sgt i32 %1, -1
  br i1 %2, label %3, label %._crit_edge

3:                                                ; preds = %0
  %4 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.12)
  %5 = load i32, ptr @top, align 4, !tbaa !5
  store i32 %5, ptr @i, align 4, !tbaa !5
  %6 = icmp sgt i32 %5, -1
  br i1 %6, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %3, %.lr.ph
  %storemerge1 = phi i32 [ %12, %.lr.ph ], [ %5, %3 ]
  %7 = zext nneg i32 %storemerge1 to i64
  %8 = getelementptr inbounds [100 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.13, i32 noundef %9)
  %11 = load i32, ptr @i, align 4, !tbaa !5
  %12 = add nsw i32 %11, -1
  store i32 %12, ptr @i, align 4, !tbaa !5
  %13 = icmp sgt i32 %11, 0
  br i1 %13, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %0, %3
  %.str.15.sink = phi ptr [ @.str.14, %3 ], [ @.str.15, %0 ], [ @.str.14, %.lr.ph ]
  %14 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) %.str.15.sink)
  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,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SimplifyCFGPass,TailCallElimPass