; LLVM IR from tangjz/acm-icpc :: buaa/oj3rd (1098)

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

4:                                                ; preds = %29, %0
  %5 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %2, ptr noundef %3)
  %6 = icmp eq i32 %5, 2
  br i1 %6, label %7, label %30

7:                                                ; preds = %4
  %8 = load i32, ptr %2, align 4, !tbaa !5
  switch i32 %8, label %29 [
    i32 0, label %9
    i32 1, label %13
    i32 2, label %17
    i32 3, label %23
  ]

9:                                                ; preds = %7
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = add nsw i32 %10, 1
  %12 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %11)
  br label %29

13:                                               ; preds = %7
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = add nsw i32 %14, 2
  %16 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %15)
  br label %29

17:                                               ; preds = %7
  %18 = load i32, ptr %3, align 4, !tbaa !5
  %19 = load i32, ptr %3, align 4, !tbaa !5
  %20 = add nsw i32 %18, %19
  %21 = add nsw i32 %20, 3
  %22 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %21)
  br label %29

23:                                               ; preds = %7
  %24 = load i32, ptr %3, align 4, !tbaa !5
  %25 = add nsw i32 %24, 3
  %26 = shl i32 1, %25
  %27 = sub nsw i32 %26, 3
  %28 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %27)
  br label %29

29:                                               ; preds = %23, %17, %13, %9, %7
  br label %4, !llvm.loop !9

30:                                               ; preds = %4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 4, 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 = !{!"int", !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 [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 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 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #3
  %3 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1, ptr noundef nonnull %2)
  %4 = icmp eq i32 %3, 2
  br i1 %4, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %0, %22
  %5 = load i32, ptr %1, align 4, !tbaa !5
  switch i32 %5, label %22 [
    i32 0, label %6
    i32 1, label %9
    i32 2, label %12
    i32 3, label %16
  ]

6:                                                ; preds = %.lr.ph
  %7 = load i32, ptr %2, align 4, !tbaa !5
  %8 = add nsw i32 %7, 1
  br label %.sink.split

9:                                                ; preds = %.lr.ph
  %10 = load i32, ptr %2, align 4, !tbaa !5
  %11 = add nsw i32 %10, 2
  br label %.sink.split

12:                                               ; preds = %.lr.ph
  %13 = load i32, ptr %2, align 4, !tbaa !5
  %14 = shl nsw i32 %13, 1
  %15 = add nsw i32 %14, 3
  br label %.sink.split

16:                                               ; preds = %.lr.ph
  %17 = load i32, ptr %2, align 4, !tbaa !5
  %18 = add nsw i32 %17, 3
  %19 = shl nuw i32 1, %18
  %20 = add nsw i32 %19, -3
  br label %.sink.split

.sink.split:                                      ; preds = %6, %9, %12, %16
  %.sink = phi i32 [ %20, %16 ], [ %15, %12 ], [ %11, %9 ], [ %8, %6 ]
  %21 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %.sink)
  br label %22

22:                                               ; preds = %.sink.split, %.lr.ph
  %23 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1, ptr noundef nonnull %2)
  %24 = icmp eq i32 %23, 2
  br i1 %24, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %22, %0
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #3
  call void @llvm.lifetime.end.p0(i64 4, 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 = !{!"int", !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