; LLVM IR from tangjz/acm-icpc :: lydsy (1022)

; 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
@sg = external dso_local global i32, align 4
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [8 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 i8, align 1
  %5 = alloca i8, align 1
  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
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %2)
  br label %7

7:                                                ; preds = %42, %0
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = add nsw i32 %8, -1
  store i32 %9, ptr %2, align 4, !tbaa !5
  %10 = icmp ne i32 %8, 0
  br i1 %10, label %11, label %43

11:                                               ; preds = %7
  call void @llvm.lifetime.start.p0(i64 1, ptr %4) #3
  store i8 0, ptr %4, align 1, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 1, ptr %5) #3
  store i8 1, ptr %5, align 1, !tbaa !9
  store i32 0, ptr @sg, align 4, !tbaa !5
  %12 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n)
  br label %13

13:                                               ; preds = %25, %11
  %14 = load i32, ptr @n, align 4, !tbaa !5
  %15 = add nsw i32 %14, -1
  store i32 %15, ptr @n, align 4, !tbaa !5
  %16 = icmp ne i32 %14, 0
  br i1 %16, label %17, label %26

17:                                               ; preds = %13
  %18 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %3)
  %19 = load i32, ptr %3, align 4, !tbaa !5
  %20 = load i32, ptr @sg, align 4, !tbaa !5
  %21 = xor i32 %20, %19
  store i32 %21, ptr @sg, align 4, !tbaa !5
  %22 = load i32, ptr %3, align 4, !tbaa !5
  %23 = icmp sgt i32 %22, 1
  br i1 %23, label %24, label %25

24:                                               ; preds = %17
  store i8 1, ptr %4, align 1, !tbaa !9
  store i8 0, ptr %5, align 1, !tbaa !9
  br label %25

25:                                               ; preds = %24, %17
  br label %13, !llvm.loop !11

26:                                               ; preds = %13
  %27 = load i32, ptr @sg, align 4, !tbaa !5
  %28 = icmp ne i32 %27, 0
  br i1 %28, label %29, label %32

29:                                               ; preds = %26
  %30 = load i8, ptr %4, align 1, !tbaa !9, !range !13, !noundef !14
  %31 = trunc i8 %30 to i1
  br i1 %31, label %38, label %32

32:                                               ; preds = %29, %26
  %33 = load i32, ptr @sg, align 4, !tbaa !5
  %34 = icmp ne i32 %33, 0
  br i1 %34, label %40, label %35

35:                                               ; preds = %32
  %36 = load i8, ptr %5, align 1, !tbaa !9, !range !13, !noundef !14
  %37 = trunc i8 %36 to i1
  br i1 %37, label %38, label %40

38:                                               ; preds = %35, %29
  %39 = call i32 @puts(ptr noundef @.str.1)
  br label %42

40:                                               ; preds = %35, %32
  %41 = call i32 @puts(ptr noundef @.str.2)
  br label %42

42:                                               ; preds = %40, %38
  call void @llvm.lifetime.end.p0(i64 1, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 1, ptr %4) #3
  br label %7, !llvm.loop !15

43:                                               ; preds = %7
  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 @puts(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 = !{!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"

@n = external dso_local global i32, align 4
@sg = external dso_local local_unnamed_addr global i32, align 4
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [8 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)
  %4 = load i32, ptr %1, align 4, !tbaa !5
  %5 = add nsw i32 %4, -1
  store i32 %5, ptr %1, align 4, !tbaa !5
  %.not12 = icmp eq i32 %4, 0
  br i1 %.not12, label %._crit_edge15, label %.lr.ph14

.lr.ph14:                                         ; preds = %0, %.thread22
  store i32 0, ptr @sg, align 4, !tbaa !5
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n)
  %7 = load i32, ptr @n, align 4, !tbaa !5
  %8 = add nsw i32 %7, -1
  store i32 %8, ptr @n, align 4, !tbaa !5
  %.not48 = icmp eq i32 %7, 0
  br i1 %.not48, label %._crit_edge.thread, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph14, %.lr.ph
  %.010 = phi i1 [ %spec.select7, %.lr.ph ], [ true, %.lr.ph14 ]
  %.029 = phi i1 [ %spec.select, %.lr.ph ], [ false, %.lr.ph14 ]
  %9 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %2)
  %10 = load i32, ptr %2, align 4, !tbaa !5
  %11 = load i32, ptr @sg, align 4, !tbaa !5
  %12 = xor i32 %11, %10
  store i32 %12, ptr @sg, align 4, !tbaa !5
  %13 = icmp sgt i32 %10, 1
  %spec.select = select i1 %13, i1 true, i1 %.029
  %not. = xor i1 %13, true
  %spec.select7 = select i1 %not., i1 %.010, i1 false
  %14 = load i32, ptr @n, align 4, !tbaa !5
  %15 = add nsw i32 %14, -1
  store i32 %15, ptr @n, align 4, !tbaa !5
  %.not4 = icmp eq i32 %14, 0
  br i1 %.not4, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph
  %.not5 = icmp eq i32 %11, %10
  br i1 %.not5, label %17, label %16

._crit_edge.thread:                               ; preds = %.lr.ph14
  %.pre = load i32, ptr @sg, align 4, !tbaa !5
  %.not518 = icmp eq i32 %.pre, 0
  br i1 %.not518, label %.thread22, label %.thread

16:                                               ; preds = %._crit_edge
  br i1 %spec.select, label %.thread22, label %.thread

17:                                               ; preds = %._crit_edge
  br i1 %spec.select7, label %.thread22, label %.thread

.thread:                                          ; preds = %._crit_edge.thread, %16, %17
  br label %.thread22

.thread22:                                        ; preds = %16, %17, %._crit_edge.thread, %.thread
  %.str.2.sink = phi ptr [ @.str.2, %.thread ], [ @.str.1, %._crit_edge.thread ], [ @.str.1, %17 ], [ @.str.1, %16 ]
  %18 = call i32 @puts(ptr noundef nonnull dereferenceable(1) %.str.2.sink)
  %19 = load i32, ptr %1, align 4, !tbaa !5
  %20 = add nsw i32 %19, -1
  store i32 %20, ptr %1, align 4, !tbaa !5
  %.not = icmp eq i32 %19, 0
  br i1 %.not, label %._crit_edge15, label %.lr.ph14, !llvm.loop !11

._crit_edge15:                                    ; preds = %.thread22, %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 @puts(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"}
!11 = distinct !{!11, !10}


; Effective O3 passes: AggressiveInstCombinePass,CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass