; LLVM IR from tangjz/acm-icpc :: lydsy (3423)

; 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 hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.2 = 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
  %4 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %5 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n, ptr noundef @m)
  %6 = load i32, ptr @n, align 4, !tbaa !5
  %7 = icmp eq i32 %6, 2
  br i1 %7, label %8, label %11

8:                                                ; preds = %0
  %9 = load i32, ptr @m, align 4, !tbaa !5
  %10 = icmp eq i32 %9, 2
  br i1 %10, label %17, label %11

11:                                               ; preds = %8, %0
  %12 = load i32, ptr @m, align 4, !tbaa !5
  %13 = load i32, ptr @m, align 4, !tbaa !5
  %14 = add nsw i32 %12, %13
  %15 = load i32, ptr @n, align 4, !tbaa !5
  %16 = icmp sgt i32 %14, %15
  br i1 %16, label %17, label %19

17:                                               ; preds = %11, %8
  %18 = call i32 @puts(ptr noundef @.str.1)
  br label %45

19:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  %20 = load i32, ptr @n, align 4, !tbaa !5
  %21 = ashr i32 %20, 1
  store i32 %21, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  %22 = load i32, ptr %2, align 4, !tbaa !5
  %23 = add nsw i32 %22, 1
  store i32 %23, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 1, ptr %4, align 4, !tbaa !5
  br label %24

24:                                               ; preds = %39, %19
  %25 = load i32, ptr %3, align 4, !tbaa !5
  %26 = load i32, ptr @n, align 4, !tbaa !5
  %27 = icmp sle i32 %25, %26
  br i1 %27, label %29, label %28

28:                                               ; preds = %24
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %44

29:                                               ; preds = %24
  %30 = load i32, ptr %3, align 4, !tbaa !5
  %31 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %30)
  %32 = load i32, ptr %4, align 4, !tbaa !5
  %33 = load i32, ptr %2, align 4, !tbaa !5
  %34 = icmp sle i32 %32, %33
  br i1 %34, label %35, label %38

35:                                               ; preds = %29
  %36 = load i32, ptr %4, align 4, !tbaa !5
  %37 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %36)
  br label %38

38:                                               ; preds = %35, %29
  br label %39

39:                                               ; preds = %38
  %40 = load i32, ptr %3, align 4, !tbaa !5
  %41 = add nsw i32 %40, 1
  store i32 %41, ptr %3, align 4, !tbaa !5
  %42 = load i32, ptr %4, align 4, !tbaa !5
  %43 = add nsw i32 %42, 1
  store i32 %43, ptr %4, align 4, !tbaa !5
  br label %24, !llvm.loop !9

44:                                               ; preds = %28
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  br label %45

45:                                               ; preds = %44, %17
  ret i32 0
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #1

declare i32 @puts(ptr noundef) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

declare i32 @printf(ptr noundef, ...) #1

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

@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.2 = 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 = 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 eq i32 %2, 2
  %4 = load i32, ptr @m, align 4
  %5 = icmp eq i32 %4, 2
  %or.cond = select i1 %3, i1 %5, i1 false
  %6 = shl nsw i32 %4, 1
  %7 = icmp sgt i32 %6, %2
  %or.cond12 = select i1 %or.cond, i1 true, i1 %7
  br i1 %or.cond12, label %8, label %10

8:                                                ; preds = %0
  %9 = tail call i32 @puts(ptr noundef nonnull dereferenceable(1) @.str.1)
  br label %.loopexit

10:                                               ; preds = %0
  %11 = ashr i32 %2, 1
  %.not.not14 = icmp sgt i32 %2, 0
  br i1 %.not.not14, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %10, %15
  %.0916.in = phi i32 [ %.0916, %15 ], [ %11, %10 ]
  %.015 = phi i32 [ %16, %15 ], [ 1, %10 ]
  %.0916 = add nuw nsw i32 %.0916.in, 1
  %12 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i32 noundef %.0916)
  %.not = icmp sgt i32 %.015, %11
  br i1 %.not, label %15, label %13

13:                                               ; preds = %.lr.ph
  %14 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i32 noundef %.015)
  br label %15

15:                                               ; preds = %.lr.ph, %13
  %16 = add nuw nsw i32 %.015, 1
  %17 = load i32, ptr @n, align 4, !tbaa !5
  %.not.not = icmp slt i32 %.0916, %17
  br i1 %.not.not, label %.lr.ph, label %.loopexit, !llvm.loop !9

.loopexit:                                        ; preds = %15, %10, %8
  ret i32 0
}

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: nofree nounwind
declare noundef i32 @puts(ptr nocapture noundef readonly) local_unnamed_addr #1

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


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