; LLVM IR from DionysiosB/CodeForces :: 1000-1099 (1027B-NumbersOnTheChessboard)

; 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 [10 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [6 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 i64, align 8
  %6 = alloca i64, align 8
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %7 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %2, ptr noundef %3)
  br label %8

8:                                                ; preds = %72, %0
  %9 = load i64, ptr %3, align 8, !tbaa !5
  %10 = add nsw i64 %9, -1
  store i64 %10, ptr %3, align 8, !tbaa !5
  %11 = icmp ne i64 %9, 0
  br i1 %11, label %12, label %75

12:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %13 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %4, ptr noundef %5)
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  store i64 0, ptr %6, align 8, !tbaa !5
  %14 = load i64, ptr %2, align 8, !tbaa !5
  %15 = srem i64 %14, 2
  %16 = icmp eq i64 %15, 0
  br i1 %16, label %17, label %37

17:                                               ; preds = %12
  %18 = load i64, ptr %4, align 8, !tbaa !5
  %19 = load i64, ptr %5, align 8, !tbaa !5
  %20 = add nsw i64 %18, %19
  %21 = srem i64 %20, 2
  %22 = load i64, ptr %2, align 8, !tbaa !5
  %23 = load i64, ptr %2, align 8, !tbaa !5
  %24 = mul nsw i64 %22, %23
  %25 = sdiv i64 %24, 2
  %26 = mul nsw i64 %21, %25
  %27 = load i64, ptr %2, align 8, !tbaa !5
  %28 = sdiv i64 %27, 2
  %29 = load i64, ptr %4, align 8, !tbaa !5
  %30 = sub nsw i64 %29, 1
  %31 = mul nsw i64 %28, %30
  %32 = add nsw i64 %26, %31
  %33 = load i64, ptr %5, align 8, !tbaa !5
  %34 = add nsw i64 %33, 1
  %35 = sdiv i64 %34, 2
  %36 = add nsw i64 %32, %35
  store i64 %36, ptr %6, align 8, !tbaa !5
  br label %72

37:                                               ; preds = %12
  %38 = load i64, ptr %4, align 8, !tbaa !5
  %39 = load i64, ptr %5, align 8, !tbaa !5
  %40 = add nsw i64 %38, %39
  %41 = srem i64 %40, 2
  %42 = load i64, ptr %2, align 8, !tbaa !5
  %43 = load i64, ptr %2, align 8, !tbaa !5
  %44 = mul nsw i64 %42, %43
  %45 = add nsw i64 %44, 1
  %46 = mul nsw i64 %41, %45
  %47 = sdiv i64 %46, 2
  %48 = load i64, ptr %4, align 8, !tbaa !5
  %49 = sub nsw i64 %48, 1
  %50 = sdiv i64 %49, 2
  %51 = load i64, ptr %2, align 8, !tbaa !5
  %52 = mul nsw i64 %50, %51
  %53 = add nsw i64 %47, %52
  %54 = load i64, ptr %4, align 8, !tbaa !5
  %55 = srem i64 %54, 2
  %56 = icmp eq i64 %55, 0
  %57 = zext i1 %56 to i64
  %58 = load i64, ptr %2, align 8, !tbaa !5
  %59 = add nsw i64 %58, 1
  %60 = load i64, ptr %4, align 8, !tbaa !5
  %61 = load i64, ptr %5, align 8, !tbaa !5
  %62 = add nsw i64 %60, %61
  %63 = srem i64 %62, 2
  %64 = sub nsw i64 %59, %63
  %65 = mul nsw i64 %57, %64
  %66 = sdiv i64 %65, 2
  %67 = add nsw i64 %53, %66
  %68 = load i64, ptr %5, align 8, !tbaa !5
  %69 = add nsw i64 %68, 1
  %70 = sdiv i64 %69, 2
  %71 = add nsw i64 %67, %70
  store i64 %71, ptr %6, align 8, !tbaa !5
  br label %72

72:                                               ; preds = %37, %17
  %73 = load i64, ptr %6, align 8, !tbaa !5
  %74 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i64 noundef %73)
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  br label %8, !llvm.loop !9

75:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #3
  ret i32 0
}

; 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 @printf(ptr noundef, ...) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { 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 long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple 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"

@.str = external hidden unnamed_addr constant [10 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [6 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
  %4 = alloca i64, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %1) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #3
  %5 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1, ptr noundef nonnull %2)
  %6 = load i64, ptr %2, align 8, !tbaa !5
  %7 = add nsw i64 %6, -1
  store i64 %7, ptr %2, align 8, !tbaa !5
  %.not1 = icmp eq i64 %6, 0
  br i1 %.not1, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %44
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #3
  %8 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %3, ptr noundef nonnull %4)
  %9 = load i64, ptr %1, align 8, !tbaa !5
  %10 = and i64 %9, 1
  %11 = icmp eq i64 %10, 0
  %12 = load i64, ptr %3, align 8, !tbaa !5
  %13 = load i64, ptr %4, align 8, !tbaa !5
  %14 = add nsw i64 %13, %12
  %15 = srem i64 %14, 2
  %16 = mul nsw i64 %9, %9
  %17 = add nsw i64 %12, -1
  br i1 %11, label %18, label %27

18:                                               ; preds = %.lr.ph
  %19 = lshr exact i64 %16, 1
  %20 = mul nsw i64 %15, %19
  %21 = ashr exact i64 %9, 1
  %22 = mul nsw i64 %17, %21
  %23 = add nsw i64 %13, 1
  %24 = sdiv i64 %23, 2
  %25 = add i64 %24, %22
  %26 = add i64 %25, %20
  br label %44

27:                                               ; preds = %.lr.ph
  %28 = add nuw nsw i64 %16, 1
  %29 = mul nsw i64 %15, %28
  %30 = ashr exact i64 %29, 1
  %31 = sdiv i64 %17, 2
  %32 = mul nsw i64 %31, %9
  %33 = and i64 %12, 1
  %34 = xor i64 %33, 1
  %35 = add nsw i64 %9, 1
  %36 = sub nsw i64 %35, %15
  %37 = mul nuw nsw i64 %36, %34
  %38 = sdiv i64 %37, 2
  %39 = add nsw i64 %13, 1
  %40 = sdiv i64 %39, 2
  %41 = add i64 %40, %32
  %42 = add i64 %41, %30
  %43 = add i64 %42, %38
  br label %44

44:                                               ; preds = %27, %18
  %.0 = phi i64 [ %26, %18 ], [ %43, %27 ]
  %45 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i64 noundef %.0)
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #3
  %46 = load i64, ptr %2, align 8, !tbaa !5
  %47 = add nsw i64 %46, -1
  store i64 %47, ptr %2, align 8, !tbaa !5
  %.not = icmp eq i64 %46, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %44, %0
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #3
  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 @printf(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

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 long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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