; LLVM IR from DionysiosB/CodeForces :: 2000B-SeatingInABus (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 [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 i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  %7 = alloca i8, align 1
  %8 = alloca i64, align 8
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #3
  %9 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %2)
  br label %10

10:                                               ; preds = %47, %0
  %11 = load i64, ptr %2, align 8, !tbaa !5
  %12 = add nsw i64 %11, -1
  store i64 %12, ptr %2, align 8, !tbaa !5
  %13 = icmp ne i64 %11, 0
  br i1 %13, label %14, label %53

14:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %15 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %3)
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %16 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %4)
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %17 = load i64, ptr %4, align 8, !tbaa !5
  %18 = sub nsw i64 %17, 1
  store i64 %18, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %19 = load i64, ptr %4, align 8, !tbaa !5
  %20 = add nsw i64 %19, 1
  store i64 %20, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 1, ptr %7) #3
  store i8 1, ptr %7, align 1, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  store i64 1, ptr %8, align 8, !tbaa !5
  br label %21

21:                                               ; preds = %44, %14
  %22 = load i64, ptr %8, align 8, !tbaa !5
  %23 = load i64, ptr %3, align 8, !tbaa !5
  %24 = icmp slt i64 %22, %23
  br i1 %24, label %26, label %25

25:                                               ; preds = %21
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  br label %47

26:                                               ; preds = %21
  %27 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %4)
  %28 = load i64, ptr %4, align 8, !tbaa !5
  %29 = load i64, ptr %5, align 8, !tbaa !5
  %30 = icmp eq i64 %28, %29
  br i1 %30, label %31, label %34

31:                                               ; preds = %26
  %32 = load i64, ptr %5, align 8, !tbaa !5
  %33 = add nsw i64 %32, -1
  store i64 %33, ptr %5, align 8, !tbaa !5
  br label %43

34:                                               ; preds = %26
  %35 = load i64, ptr %4, align 8, !tbaa !5
  %36 = load i64, ptr %6, align 8, !tbaa !5
  %37 = icmp eq i64 %35, %36
  br i1 %37, label %38, label %41

38:                                               ; preds = %34
  %39 = load i64, ptr %6, align 8, !tbaa !5
  %40 = add nsw i64 %39, 1
  store i64 %40, ptr %6, align 8, !tbaa !5
  br label %42

41:                                               ; preds = %34
  store i8 0, ptr %7, align 1, !tbaa !9
  br label %42

42:                                               ; preds = %41, %38
  br label %43

43:                                               ; preds = %42, %31
  br label %44

44:                                               ; preds = %43
  %45 = load i64, ptr %8, align 8, !tbaa !5
  %46 = add nsw i64 %45, 1
  store i64 %46, ptr %8, align 8, !tbaa !5
  br label %21, !llvm.loop !11

47:                                               ; preds = %25
  %48 = load i8, ptr %7, align 1, !tbaa !9, !range !13, !noundef !14
  %49 = trunc i8 %48 to i1
  %50 = zext i1 %49 to i64
  %51 = select i1 %49, ptr @.str.1, ptr @.str.2
  %52 = call i32 @puts(ptr noundef %51)
  call void @llvm.lifetime.end.p0(i64 1, ptr %7) #3
  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
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  br label %10, !llvm.loop !15

53:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #3
  %54 = load i32, ptr %1, align 4
  ret i32 %54
}

; 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

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

declare i32 @puts(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 = !{!10, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{i8 0, i8 2}
!14 = !{}
!15 = distinct !{!15, !12}


; 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 [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 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
  %.not19 = icmp eq i64 %5, 0
  br i1 %.not19, label %._crit_edge22, label %.lr.ph21

.lr.ph21:                                         ; preds = %0, %14
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #3
  %7 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %2)
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #3
  %8 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %3)
  %9 = load i64, ptr %2, align 8, !tbaa !5
  %10 = icmp sgt i64 %9, 1
  br i1 %10, label %.lr.ph.preheader, label %._crit_edge.thread

.lr.ph.preheader:                                 ; preds = %.lr.ph21
  %11 = load i64, ptr %3, align 8, !tbaa !5
  %12 = add nsw i64 %11, 1
  %13 = add nsw i64 %11, -1
  br label %.lr.ph

._crit_edge:                                      ; preds = %27
  br i1 %cond.fr, label %._crit_edge.thread, label %14

._crit_edge.thread:                               ; preds = %.lr.ph21, %._crit_edge
  br label %14

14:                                               ; preds = %._crit_edge, %._crit_edge.thread
  %15 = phi ptr [ @.str.1, %._crit_edge.thread ], [ @.str.2, %._crit_edge ]
  %16 = call i32 @puts(ptr noundef nonnull dereferenceable(1) %15)
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #3
  %17 = load i64, ptr %1, align 8, !tbaa !5
  %18 = add nsw i64 %17, -1
  store i64 %18, ptr %1, align 8, !tbaa !5
  %.not = icmp eq i64 %17, 0
  br i1 %.not, label %._crit_edge22, label %.lr.ph21, !llvm.loop !9

.lr.ph:                                           ; preds = %.lr.ph.preheader, %27
  %.018 = phi i64 [ %28, %27 ], [ 1, %.lr.ph.preheader ]
  %.0817 = phi i1 [ %cond.fr, %27 ], [ true, %.lr.ph.preheader ]
  %.0916 = phi i64 [ %.110, %27 ], [ %12, %.lr.ph.preheader ]
  %.01115 = phi i64 [ %.112, %27 ], [ %13, %.lr.ph.preheader ]
  %19 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %3)
  %20 = load i64, ptr %3, align 8, !tbaa !5
  %21 = icmp eq i64 %20, %.01115
  br i1 %21, label %22, label %24

22:                                               ; preds = %.lr.ph
  %23 = add nsw i64 %.01115, -1
  br label %27

24:                                               ; preds = %.lr.ph
  %25 = icmp eq i64 %20, %.0916
  %26 = zext i1 %25 to i64
  %spec.select = add nsw i64 %.0916, %26
  %spec.select14 = and i1 %25, %.0817
  br label %27

27:                                               ; preds = %24, %22
  %.112 = phi i64 [ %23, %22 ], [ %.01115, %24 ]
  %.110 = phi i64 [ %.0916, %22 ], [ %spec.select, %24 ]
  %.1 = phi i1 [ %.0817, %22 ], [ %spec.select14, %24 ]
  %cond.fr = freeze i1 %.1
  %28 = add nuw nsw i64 %.018, 1
  %29 = load i64, ptr %2, align 8, !tbaa !5
  %30 = icmp slt i64 %28, %29
  br i1 %30, label %.lr.ph, label %._crit_edge, !llvm.loop !11

._crit_edge22:                                    ; preds = %14, %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: 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 @puts(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: AggressiveInstCombinePass,CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass