; LLVM IR from tangjz/acm-icpc :: lydsy (2456)

; 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
@x = external dso_local global i32, align 4
@ans = external dso_local global i32, align 4
@cnt = external dso_local global i32, align 4
@.str = 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
  store i32 0, ptr %1, align 4
  call void @_Z6getintRi(ptr noundef nonnull align 4 dereferenceable(4) @n)
  br label %2

2:                                                ; preds = %21, %0
  %3 = load i32, ptr @n, align 4, !tbaa !5
  %4 = add nsw i32 %3, -1
  store i32 %4, ptr @n, align 4, !tbaa !5
  %5 = icmp ne i32 %3, 0
  br i1 %5, label %6, label %23

6:                                                ; preds = %2
  call void @_Z6getintRi(ptr noundef nonnull align 4 dereferenceable(4) @x)
  %7 = load i32, ptr @cnt, align 4, !tbaa !5
  %8 = icmp ne i32 %7, 0
  br i1 %8, label %11, label %9

9:                                                ; preds = %6
  %10 = load i32, ptr @x, align 4, !tbaa !5
  store i32 %10, ptr @ans, align 4, !tbaa !5
  br label %11

11:                                               ; preds = %9, %6
  %12 = load i32, ptr @ans, align 4, !tbaa !5
  %13 = load i32, ptr @x, align 4, !tbaa !5
  %14 = icmp eq i32 %12, %13
  br i1 %14, label %15, label %18

15:                                               ; preds = %11
  %16 = load i32, ptr @cnt, align 4, !tbaa !5
  %17 = add nsw i32 %16, 1
  store i32 %17, ptr @cnt, align 4, !tbaa !5
  br label %21

18:                                               ; preds = %11
  %19 = load i32, ptr @cnt, align 4, !tbaa !5
  %20 = add nsw i32 %19, -1
  store i32 %20, ptr @cnt, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %18, %15
  %22 = phi ptr [ @cnt, %15 ], [ @cnt, %18 ]
  br label %2, !llvm.loop !9

23:                                               ; preds = %2
  %24 = load i32, ptr @ans, align 4, !tbaa !5
  %25 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %24)
  ret i32 0
}

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_Z6getintRi(ptr noundef nonnull align 4 dereferenceable(4)) #1

declare i32 @printf(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 = { inlinehint 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 #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" }

!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
@x = external dso_local global i32, align 4
@ans = external dso_local local_unnamed_addr global i32, align 4
@cnt = external dso_local local_unnamed_addr global i32, align 4
@.str = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  tail call void @_Z6getintRi(ptr noundef nonnull align 4 dereferenceable(4) @n)
  %1 = load i32, ptr @n, align 4, !tbaa !5
  %2 = add nsw i32 %1, -1
  store i32 %2, ptr @n, align 4, !tbaa !5
  %.not2 = icmp eq i32 %1, 0
  br i1 %.not2, label %.._crit_edge_crit_edge, label %.lr.ph

.._crit_edge_crit_edge:                           ; preds = %0
  %.pre4 = load i32, ptr @ans, align 4, !tbaa !5
  br label %._crit_edge

.lr.ph:                                           ; preds = %0, %6
  tail call void @_Z6getintRi(ptr noundef nonnull align 4 dereferenceable(4) @x)
  %3 = load i32, ptr @cnt, align 4
  %.not1 = icmp eq i32 %3, 0
  br i1 %.not1, label %4, label %.lr.ph._crit_edge

.lr.ph._crit_edge:                                ; preds = %.lr.ph
  %.pre = load i32, ptr @ans, align 4, !tbaa !5
  %.pre3 = load i32, ptr @x, align 4, !tbaa !5
  br label %6

4:                                                ; preds = %.lr.ph
  %5 = load i32, ptr @x, align 4, !tbaa !5
  store i32 %5, ptr @ans, align 4, !tbaa !5
  br label %6

6:                                                ; preds = %.lr.ph._crit_edge, %4
  %7 = phi i32 [ %.pre3, %.lr.ph._crit_edge ], [ %5, %4 ]
  %8 = phi i32 [ %.pre, %.lr.ph._crit_edge ], [ %5, %4 ]
  %9 = icmp eq i32 %8, %7
  %storemerge.v = select i1 %9, i32 1, i32 -1
  %storemerge = add nsw i32 %storemerge.v, %3
  store i32 %storemerge, ptr @cnt, align 4, !tbaa !5
  %10 = load i32, ptr @n, align 4, !tbaa !5
  %11 = add nsw i32 %10, -1
  store i32 %11, ptr @n, align 4, !tbaa !5
  %.not = icmp eq i32 %10, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %6, %.._crit_edge_crit_edge
  %12 = phi i32 [ %.pre4, %.._crit_edge_crit_edge ], [ %8, %6 ]
  %13 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %12)
  ret i32 0
}

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_Z6getintRi(ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #1

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


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