; LLVM IR from div-bargali/Data-Structures-and-Algorithms :: C/Data-Structures/Queue (Queue_using_Stacks)

; 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"

@top1 = external dso_local global i32, align 4
@top2 = external dso_local global i32, align 4
@S1 = external dso_local global [100 x i32], align 16
@.str.11 = external hidden unnamed_addr constant [16 x i8], align 1
@.str.12 = external hidden unnamed_addr constant [29 x i8], align 1
@.str.13 = external hidden unnamed_addr constant [5 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 @display() #2 {
  %1 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  %2 = load i32, ptr @top1, align 4, !tbaa !5
  %3 = icmp eq i32 %2, -1
  br i1 %3, label %4, label %9

4:                                                ; preds = %0
  %5 = load i32, ptr @top2, align 4, !tbaa !5
  %6 = icmp eq i32 %5, -1
  br i1 %6, label %7, label %9

7:                                                ; preds = %4
  %8 = call i32 (ptr, ...) @printf(ptr noundef @.str.11)
  br label %25

9:                                                ; preds = %4, %0
  %10 = call i32 (ptr, ...) @printf(ptr noundef @.str.12)
  store i32 0, ptr %1, align 4, !tbaa !5
  br label %11

11:                                               ; preds = %21, %9
  %12 = load i32, ptr %1, align 4, !tbaa !5
  %13 = load i32, ptr @top1, align 4, !tbaa !5
  %14 = icmp sle i32 %12, %13
  br i1 %14, label %15, label %24

15:                                               ; preds = %11
  %16 = load i32, ptr %1, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [100 x i32], ptr @S1, i64 0, i64 %17
  %19 = load i32, ptr %18, align 4, !tbaa !5
  %20 = call i32 (ptr, ...) @printf(ptr noundef @.str.13, i32 noundef %19)
  br label %21

21:                                               ; preds = %15
  %22 = load i32, ptr %1, align 4, !tbaa !5
  %23 = add nsw i32 %22, 1
  store i32 %23, ptr %1, align 4, !tbaa !5
  br label %11, !llvm.loop !9

24:                                               ; preds = %11
  br label %25

25:                                               ; preds = %24, %7
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  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 = { 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"

@top1 = external dso_local local_unnamed_addr global i32, align 4
@top2 = external dso_local local_unnamed_addr global i32, align 4
@S1 = external dso_local local_unnamed_addr global [100 x i32], align 16
@.str.11 = external hidden unnamed_addr constant [16 x i8], align 1
@.str.12 = external hidden unnamed_addr constant [29 x i8], align 1
@.str.13 = external hidden unnamed_addr constant [5 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 @top1, align 4, !tbaa !5
  %2 = icmp eq i32 %1, -1
  %3 = load i32, ptr @top2, align 4
  %4 = icmp eq i32 %3, -1
  %or.cond = select i1 %2, i1 %4, i1 false
  br i1 %or.cond, label %5, label %7

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

7:                                                ; preds = %0
  %8 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.12)
  %9 = load i32, ptr @top1, align 4, !tbaa !5
  %.not4 = icmp slt i32 %9, 0
  br i1 %.not4, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %7, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %7 ]
  %10 = getelementptr inbounds [100 x i32], ptr @S1, i64 0, i64 %indvars.iv
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.13, i32 noundef %11)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %13 = load i32, ptr @top1, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %.not.not = icmp slt i64 %indvars.iv, %14
  br i1 %.not.not, label %.lr.ph, label %.loopexit, !llvm.loop !9

.loopexit:                                        ; preds = %.lr.ph, %7, %5
  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: GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass