; LLVM IR from DionysiosB/CodeForces :: 1995A-Diagonals (main)

; 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"

@.str = external hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [8 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [5 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #3
  %8 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %2)
  br label %9

9:                                                ; preds = %57, %55, %0
  %10 = load i64, ptr %2, align 8, !tbaa !5
  %11 = add nsw i64 %10, -1
  store i64 %11, ptr %2, align 8, !tbaa !5
  %12 = icmp ne i64 %10, 0
  br i1 %12, label %13, label %58

13:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %14 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef %3, ptr noundef %4)
  %15 = load i64, ptr %4, align 8, !tbaa !5
  %16 = icmp ne i64 %15, 0
  br i1 %16, label %19, label %17

17:                                               ; preds = %13
  %18 = call i32 @puts(ptr noundef @.str.2)
  store i32 2, ptr %5, align 4
  br label %55, !llvm.loop !9

19:                                               ; preds = %13
  %20 = load i64, ptr %3, align 8, !tbaa !5
  %21 = load i64, ptr %4, align 8, !tbaa !5
  %22 = sub nsw i64 %21, %20
  store i64 %22, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  store i64 1, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %23 = load i64, ptr %3, align 8, !tbaa !5
  %24 = sub nsw i64 %23, 1
  store i64 %24, ptr %7, align 8, !tbaa !5
  br label %25

25:                                               ; preds = %49, %19
  %26 = load i64, ptr %4, align 8, !tbaa !5
  %27 = icmp sgt i64 %26, 0
  br i1 %27, label %28, label %31

28:                                               ; preds = %25
  %29 = load i64, ptr %7, align 8, !tbaa !5
  %30 = icmp sgt i64 %29, 0
  br label %31

31:                                               ; preds = %28, %25
  %32 = phi i1 [ false, %25 ], [ %30, %28 ]
  br i1 %32, label %34, label %33

33:                                               ; preds = %31
  store i32 4, ptr %5, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  br label %52

34:                                               ; preds = %31
  %35 = load i64, ptr %7, align 8, !tbaa !5
  %36 = load i64, ptr %4, align 8, !tbaa !5
  %37 = sub nsw i64 %36, %35
  store i64 %37, ptr %4, align 8, !tbaa !5
  %38 = load i64, ptr %6, align 8, !tbaa !5
  %39 = add nsw i64 %38, 1
  store i64 %39, ptr %6, align 8, !tbaa !5
  %40 = load i64, ptr %4, align 8, !tbaa !5
  %41 = icmp sgt i64 %40, 0
  br i1 %41, label %42, label %48

42:                                               ; preds = %34
  %43 = load i64, ptr %7, align 8, !tbaa !5
  %44 = load i64, ptr %4, align 8, !tbaa !5
  %45 = sub nsw i64 %44, %43
  store i64 %45, ptr %4, align 8, !tbaa !5
  %46 = load i64, ptr %6, align 8, !tbaa !5
  %47 = add nsw i64 %46, 1
  store i64 %47, ptr %6, align 8, !tbaa !5
  br label %48

48:                                               ; preds = %42, %34
  br label %49

49:                                               ; preds = %48
  %50 = load i64, ptr %7, align 8, !tbaa !5
  %51 = add nsw i64 %50, -1
  store i64 %51, ptr %7, align 8, !tbaa !5
  br label %25, !llvm.loop !11

52:                                               ; preds = %33
  %53 = load i64, ptr %6, align 8, !tbaa !5
  %54 = call i32 (ptr, ...) @printf(ptr noundef @.str.3, i64 noundef %53)
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  store i32 0, ptr %5, align 4
  br label %55

55:                                               ; preds = %52, %17
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  %56 = load i32, ptr %5, align 4
  switch i32 %56, label %60 [
    i32 0, label %57
    i32 2, label %9
  ]

57:                                               ; preds = %55
  br label %9, !llvm.loop !9

58:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #3
  %59 = load i32, ptr %1, align 4
  ret i32 %59

60:                                               ; preds = %55
  unreachable
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare i32 @__isoc99_scanf(ptr noundef, ...) #2

declare i32 @puts(ptr noundef) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

declare i32 @printf(ptr noundef, ...) #2

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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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 = !{!"long", !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"

@.str = external hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [8 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [5 x i8], align 1

; Function Attrs: mustprogress nofree norecurse nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca i64, align 8
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %1) #3
  %4 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1)
  %5 = load i64, ptr %1, align 8, !tbaa !5
  %6 = add nsw i64 %5, -1
  store i64 %6, ptr %1, align 8, !tbaa !5
  %.not16 = icmp eq i64 %5, 0
  br i1 %.not16, label %._crit_edge19, label %.lr.ph18

.lr.ph18:                                         ; preds = %0, %27
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #3
  %7 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull %2, ptr noundef nonnull %3)
  %8 = load i64, ptr %3, align 8, !tbaa !5
  %.not12 = icmp eq i64 %8, 0
  br i1 %.not12, label %9, label %11

9:                                                ; preds = %.lr.ph18
  %10 = call i32 @puts(ptr noundef nonnull dereferenceable(1) @.str.2)
  br label %27, !llvm.loop !9

11:                                               ; preds = %.lr.ph18
  %12 = load i64, ptr %2, align 8, !tbaa !5
  %13 = sub nsw i64 %8, %12
  store i64 %13, ptr %3, align 8, !tbaa !5
  %14 = icmp sgt i64 %13, 0
  %15 = icmp sgt i64 %12, 1
  %16 = and i1 %14, %15
  br i1 %16, label %.lr.ph, label %17

._crit_edge:                                      ; preds = %.lr.ph
  store i64 %23, ptr %3, align 8, !tbaa !5
  br label %17

17:                                               ; preds = %._crit_edge, %11
  %.08.lcssa = phi i64 [ %.1, %._crit_edge ], [ 1, %11 ]
  %18 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.3, i64 noundef %.08.lcssa)
  br label %27

.lr.ph:                                           ; preds = %11, %.lr.ph
  %.015.in = phi i64 [ %.015, %.lr.ph ], [ %12, %11 ]
  %.0814 = phi i64 [ %.1, %.lr.ph ], [ 1, %11 ]
  %19 = phi i64 [ %23, %.lr.ph ], [ %13, %11 ]
  %.015 = add nsw i64 %.015.in, -1
  %20 = sub nsw i64 %19, %.015
  %21 = icmp sgt i64 %20, 0
  %22 = select i1 %21, i64 %.015, i64 0
  %23 = sub nsw i64 %20, %22
  %.1.v = select i1 %21, i64 2, i64 1
  %.1 = add nuw nsw i64 %.0814, %.1.v
  %24 = icmp sgt i64 %23, 0
  %25 = icmp ugt i64 %.015.in, 2
  %26 = and i1 %24, %25
  br i1 %26, label %.lr.ph, label %._crit_edge, !llvm.loop !11

27:                                               ; preds = %17, %9
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #3
  %28 = load i64, ptr %1, align 8, !tbaa !5
  %29 = add nsw i64 %28, -1
  store i64 %29, ptr %1, align 8, !tbaa !5
  %.not = icmp eq i64 %28, 0
  br i1 %.not, label %._crit_edge19, label %.lr.ph18

._crit_edge19:                                    ; preds = %27, %0
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %1) #3
  ret i32 0
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @puts(ptr nocapture noundef readonly) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 #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 = !{!"long", !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,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass