; LLVM IR from VastoLorde95/Competitive-Programming :: Codeforces/IndiaHacks 2016/Problem A (A)

; 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"

@n = external dso_local global i32, align 4
@t = external dso_local global [1001 x i32], align 16
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n)
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  store i32 0, ptr %2, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %19, %0
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = load i32, ptr @n, align 4, !tbaa !5
  %10 = icmp slt i32 %8, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  br label %22

12:                                               ; preds = %7
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  %13 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %3)
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [1001 x i32], ptr @t, i64 0, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = add nsw i32 %17, 1
  store i32 %18, ptr %16, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %19

19:                                               ; preds = %12
  %20 = load i32, ptr %2, align 4, !tbaa !5
  %21 = add nsw i32 %20, 1
  store i32 %21, ptr %2, align 4, !tbaa !5
  br label %7, !llvm.loop !9

22:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 3, ptr %4, align 4, !tbaa !5
  br label %23

23:                                               ; preds = %50, %22
  %24 = load i32, ptr %4, align 4, !tbaa !5
  %25 = icmp slt i32 %24, 1001
  br i1 %25, label %27, label %26

26:                                               ; preds = %23
  store i32 5, ptr %5, align 4
  br label %53

27:                                               ; preds = %23
  %28 = load i32, ptr %4, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [1001 x i32], ptr @t, i64 0, i64 %29
  %31 = load i32, ptr %30, align 4, !tbaa !5
  %32 = icmp sgt i32 %31, 0
  br i1 %32, label %33, label %49

33:                                               ; preds = %27
  %34 = load i32, ptr %4, align 4, !tbaa !5
  %35 = sub nsw i32 %34, 1
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds [1001 x i32], ptr @t, i64 0, i64 %36
  %38 = load i32, ptr %37, align 4, !tbaa !5
  %39 = icmp sgt i32 %38, 0
  br i1 %39, label %40, label %49

40:                                               ; preds = %33
  %41 = load i32, ptr %4, align 4, !tbaa !5
  %42 = sub nsw i32 %41, 2
  %43 = sext i32 %42 to i64
  %44 = getelementptr inbounds [1001 x i32], ptr @t, i64 0, i64 %43
  %45 = load i32, ptr %44, align 4, !tbaa !5
  %46 = icmp sgt i32 %45, 0
  br i1 %46, label %47, label %49

47:                                               ; preds = %40
  %48 = call i32 @puts(ptr noundef @.str.1)
  store i32 0, ptr %1, align 4
  store i32 1, ptr %5, align 4
  br label %53

49:                                               ; preds = %40, %33, %27
  br label %50

50:                                               ; preds = %49
  %51 = load i32, ptr %4, align 4, !tbaa !5
  %52 = add nsw i32 %51, 1
  store i32 %52, ptr %4, align 4, !tbaa !5
  br label %23, !llvm.loop !11

53:                                               ; preds = %47, %26
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  %54 = load i32, ptr %5, align 4
  switch i32 %54, label %59 [
    i32 5, label %55
    i32 1, label %57
  ]

55:                                               ; preds = %53
  %56 = call i32 @puts(ptr noundef @.str.2)
  store i32 0, ptr %1, align 4
  br label %57

57:                                               ; preds = %55, %53
  %58 = load i32, ptr %1, align 4
  ret i32 %58

59:                                               ; preds = %53
  unreachable
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #1

; 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

declare i32 @puts(ptr noundef) #1

attributes #0 = { mustprogress norecurse 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 = { "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, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


; 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"

@n = external dso_local global i32, align 4
@t = external dso_local local_unnamed_addr global [1001 x i32], align 16
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress nofree norecurse nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca i32, align 4
  %2 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n)
  %3 = load i32, ptr @n, align 4, !tbaa !5
  %4 = icmp sgt i32 %3, 0
  br i1 %4, label %.lr.ph, label %.preheader.preheader

.lr.ph:                                           ; preds = %0, %.lr.ph
  %.01015 = phi i32 [ %11, %.lr.ph ], [ 0, %0 ]
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #3
  %5 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1)
  %6 = load i32, ptr %1, align 4, !tbaa !5
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds [1001 x i32], ptr @t, i64 0, i64 %7
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = add nsw i32 %9, 1
  store i32 %10, ptr %8, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #3
  %11 = add nuw nsw i32 %.01015, 1
  %12 = load i32, ptr @n, align 4, !tbaa !5
  %13 = icmp slt i32 %11, %12
  br i1 %13, label %.lr.ph, label %.preheader.preheader, !llvm.loop !9

.preheader.preheader:                             ; preds = %.lr.ph, %0
  br label %.preheader

.preheader:                                       ; preds = %36, %.preheader.preheader
  %indvars.iv = phi i64 [ 3, %.preheader.preheader ], [ %indvars.iv.next.1, %36 ]
  %14 = getelementptr inbounds [1001 x i32], ptr @t, i64 0, i64 %indvars.iv
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %16 = icmp sgt i32 %15, 0
  br i1 %16, label %17, label %.preheader.1

17:                                               ; preds = %.preheader
  %18 = add nsw i64 %indvars.iv, -1
  %19 = getelementptr inbounds [1001 x i32], ptr @t, i64 0, i64 %18
  %20 = load i32, ptr %19, align 4, !tbaa !5
  %21 = icmp sgt i32 %20, 0
  br i1 %21, label %22, label %.preheader.1

22:                                               ; preds = %17
  %23 = add nsw i64 %indvars.iv, -2
  %24 = getelementptr inbounds [1001 x i32], ptr @t, i64 0, i64 %23
  %25 = load i32, ptr %24, align 4, !tbaa !5
  %26 = icmp sgt i32 %25, 0
  br i1 %26, label %37, label %.preheader.1

.preheader.1:                                     ; preds = %.preheader, %17, %22
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %27 = getelementptr inbounds [1001 x i32], ptr @t, i64 0, i64 %indvars.iv.next
  %28 = load i32, ptr %27, align 4, !tbaa !5
  %29 = icmp sgt i32 %28, 0
  %30 = icmp sgt i32 %15, 0
  %or.cond = and i1 %29, %30
  br i1 %or.cond, label %31, label %36

31:                                               ; preds = %.preheader.1
  %32 = add nsw i64 %indvars.iv, -1
  %33 = getelementptr inbounds [1001 x i32], ptr @t, i64 0, i64 %32
  %34 = load i32, ptr %33, align 4, !tbaa !5
  %35 = icmp sgt i32 %34, 0
  br i1 %35, label %37, label %36

36:                                               ; preds = %31, %.preheader.1
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %exitcond.not.1 = icmp eq i64 %indvars.iv.next.1, 1001
  br i1 %exitcond.not.1, label %37, label %.preheader, !llvm.loop !11

37:                                               ; preds = %36, %31, %22
  %.str.1.sink = phi ptr [ @.str.1, %22 ], [ @.str.1, %31 ], [ @.str.2, %36 ]
  %38 = call i32 @puts(ptr noundef nonnull dereferenceable(1) %.str.1.sink)
  ret i32 0
}

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

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

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

; Function Attrs: nofree nounwind
declare noundef i32 @puts(ptr nocapture noundef readonly) local_unnamed_addr #1

attributes #0 = { mustprogress nofree norecurse 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" }
attributes #2 = { mustprogress 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, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


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