; LLVM IR from tangjz/acm-icpc :: codeforces/complete (510B)

; 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
@m = external dso_local global i32, align 4
@str = external dso_local global [51 x [51 x i8]], align 16
@vis = external dso_local global [51 x [51 x i8]], align 16
@flag = external dso_local global i8, align 1
@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z3dfsiii(i32 noundef, i32 noundef, i32 noundef) #0

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

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

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

7:                                                ; preds = %17, %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) #4
  br label %20

12:                                               ; preds = %7
  %13 = load i32, ptr %2, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [51 x i8], ptr @str, i64 %14
  %16 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef %15)
  br label %17

17:                                               ; preds = %12
  %18 = load i32, ptr %2, align 4, !tbaa !5
  %19 = add nsw i32 %18, 1
  store i32 %19, ptr %2, align 4, !tbaa !5
  br label %7, !llvm.loop !9

20:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #4
  store i32 0, ptr %3, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %49, %20
  %22 = load i32, ptr %3, align 4, !tbaa !5
  %23 = load i32, ptr @n, align 4, !tbaa !5
  %24 = icmp slt i32 %22, %23
  br i1 %24, label %26, label %25

25:                                               ; preds = %21
  store i32 5, ptr %4, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #4
  br label %52

26:                                               ; preds = %21
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #4
  store i32 0, ptr %5, align 4, !tbaa !5
  br label %27

27:                                               ; preds = %45, %26
  %28 = load i32, ptr %5, align 4, !tbaa !5
  %29 = load i32, ptr @m, align 4, !tbaa !5
  %30 = icmp slt i32 %28, %29
  br i1 %30, label %32, label %31

31:                                               ; preds = %27
  store i32 8, ptr %4, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  br label %48

32:                                               ; preds = %27
  %33 = load i32, ptr %3, align 4, !tbaa !5
  %34 = sext i32 %33 to i64
  %35 = getelementptr inbounds [51 x [51 x i8]], ptr @vis, i64 0, i64 %34
  %36 = load i32, ptr %5, align 4, !tbaa !5
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds [51 x i8], ptr %35, i64 0, i64 %37
  %39 = load i8, ptr %38, align 1, !tbaa !11, !range !13, !noundef !14
  %40 = trunc i8 %39 to i1
  br i1 %40, label %44, label %41

41:                                               ; preds = %32
  %42 = load i32, ptr %3, align 4, !tbaa !5
  %43 = load i32, ptr %5, align 4, !tbaa !5
  call void @_Z3dfsiii(i32 noundef %42, i32 noundef %43, i32 noundef 4)
  br label %44

44:                                               ; preds = %41, %32
  br label %45

45:                                               ; preds = %44
  %46 = load i32, ptr %5, align 4, !tbaa !5
  %47 = add nsw i32 %46, 1
  store i32 %47, ptr %5, align 4, !tbaa !5
  br label %27, !llvm.loop !15

48:                                               ; preds = %31
  br label %49

49:                                               ; preds = %48
  %50 = load i32, ptr %3, align 4, !tbaa !5
  %51 = add nsw i32 %50, 1
  store i32 %51, ptr %3, align 4, !tbaa !5
  br label %21, !llvm.loop !16

52:                                               ; preds = %25
  %53 = load i8, ptr @flag, align 1, !tbaa !11, !range !13, !noundef !14
  %54 = trunc i8 %53 to i1
  %55 = zext i1 %54 to i64
  %56 = select i1 %54, ptr @.str.2, ptr @.str.3
  %57 = call i32 @puts(ptr noundef %56)
  ret i32 0
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #3

declare i32 @puts(ptr noundef) #3

attributes #0 = { mustprogress 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 = { 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 #3 = { "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 #4 = { 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 = !{!12, !12, i64 0}
!12 = !{!"bool", !7, i64 0}
!13 = !{i8 0, i8 2}
!14 = !{}
!15 = distinct !{!15, !10}
!16 = distinct !{!16, !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
@m = external dso_local global i32, align 4
@str = external dso_local global [51 x [51 x i8]], align 16
@vis = external dso_local local_unnamed_addr global [51 x [51 x i8]], align 16
@flag = external dso_local local_unnamed_addr global i8, align 1
@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z3dfsiii(i32 noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #1 {
  %1 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n, ptr noundef nonnull @m)
  %2 = load i32, ptr @n, align 4, !tbaa !5
  %3 = icmp sgt i32 %2, 0
  br i1 %3, label %.lr.ph, label %._crit_edge18

.preheader13:                                     ; preds = %.lr.ph
  %4 = icmp sgt i32 %9, 0
  %5 = load i32, ptr @m, align 4
  %6 = icmp sgt i32 %5, 0
  %or.cond = select i1 %4, i1 %6, i1 false
  br i1 %or.cond, label %.preheader, label %._crit_edge18

.lr.ph:                                           ; preds = %0, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ]
  %7 = getelementptr inbounds [51 x i8], ptr @str, i64 %indvars.iv
  %8 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull %7)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %9 = load i32, ptr @n, align 4, !tbaa !5
  %10 = sext i32 %9 to i64
  %11 = icmp slt i64 %indvars.iv.next, %10
  br i1 %11, label %.lr.ph, label %.preheader13, !llvm.loop !9

.preheader:                                       ; preds = %.preheader13, %._crit_edge
  %12 = phi i32 [ %21, %._crit_edge ], [ %9, %.preheader13 ]
  %13 = phi i32 [ %22, %._crit_edge ], [ %5, %.preheader13 ]
  %14 = phi i32 [ %23, %._crit_edge ], [ %5, %.preheader13 ]
  %indvars.iv24 = phi i64 [ %indvars.iv.next25, %._crit_edge ], [ 0, %.preheader13 ]
  %15 = icmp sgt i32 %14, 0
  br i1 %15, label %.lr.ph16, label %._crit_edge

.lr.ph16:                                         ; preds = %.preheader
  %16 = trunc nuw nsw i64 %indvars.iv24 to i32
  br label %26

._crit_edge18:                                    ; preds = %._crit_edge, %0, %.preheader13
  %17 = load i8, ptr @flag, align 1, !tbaa !11, !range !13, !noundef !14
  %18 = trunc nuw i8 %17 to i1
  %19 = select i1 %18, ptr @.str.2, ptr @.str.3
  %20 = tail call i32 @puts(ptr noundef nonnull dereferenceable(1) %19)
  ret i32 0

._crit_edge.loopexit:                             ; preds = %33
  %.pre27 = load i32, ptr @n, align 4, !tbaa !5
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %.preheader
  %21 = phi i32 [ %.pre27, %._crit_edge.loopexit ], [ %12, %.preheader ]
  %22 = phi i32 [ %34, %._crit_edge.loopexit ], [ %13, %.preheader ]
  %23 = phi i32 [ %34, %._crit_edge.loopexit ], [ %14, %.preheader ]
  %indvars.iv.next25 = add nuw nsw i64 %indvars.iv24, 1
  %24 = sext i32 %21 to i64
  %25 = icmp slt i64 %indvars.iv.next25, %24
  br i1 %25, label %.preheader, label %._crit_edge18, !llvm.loop !15

26:                                               ; preds = %.lr.ph16, %33
  %27 = phi i32 [ %13, %.lr.ph16 ], [ %34, %33 ]
  %indvars.iv21 = phi i64 [ 0, %.lr.ph16 ], [ %indvars.iv.next22, %33 ]
  %28 = getelementptr inbounds [51 x [51 x i8]], ptr @vis, i64 0, i64 %indvars.iv24, i64 %indvars.iv21
  %29 = load i8, ptr %28, align 1, !tbaa !11, !range !13, !noundef !14
  %30 = trunc nuw i8 %29 to i1
  br i1 %30, label %33, label %31

31:                                               ; preds = %26
  %32 = trunc nuw nsw i64 %indvars.iv21 to i32
  tail call void @_Z3dfsiii(i32 noundef %16, i32 noundef %32, i32 noundef 4)
  %.pre = load i32, ptr @m, align 4, !tbaa !5
  br label %33

33:                                               ; preds = %26, %31
  %34 = phi i32 [ %27, %26 ], [ %.pre, %31 ]
  %indvars.iv.next22 = add nuw nsw i64 %indvars.iv21, 1
  %35 = sext i32 %34 to i64
  %36 = icmp slt i64 %indvars.iv.next22, %35
  br i1 %36, label %26, label %._crit_edge.loopexit, !llvm.loop !17
}

; 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

attributes #0 = { mustprogress 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 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 #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" }

!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 = !{!12, !12, i64 0}
!12 = !{!"bool", !7, i64 0}
!13 = !{i8 0, i8 2}
!14 = !{}
!15 = distinct !{!15, !10, !16}
!16 = !{!"llvm.loop.unswitch.partial.disable"}
!17 = distinct !{!17, !10}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyCFGPass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimpleLoopUnswitchPass,SimplifyCFGPass,TailCallElimPass