; LLVM IR from tangjz/acm-icpc :: lydsy (2173)

; 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"

%struct.Matrix = type { i32, i32, [2 x [2 x i32]] }

@A = external dso_local global %struct.Matrix, align 4
@B = external dso_local global %struct.Matrix, align 4
@n = 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 [4 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca %struct.Matrix, align 4
  %3 = alloca %struct.Matrix, align 4
  store i32 0, ptr %1, align 4
  %4 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n)
  %5 = load i32, ptr @n, align 4, !tbaa !5
  %6 = add nsw i32 %5, -1
  store i32 %6, ptr @n, align 4, !tbaa !5
  store i32 1, ptr getelementptr inbounds ([2 x [2 x i32]], ptr getelementptr inbounds (%struct.Matrix, ptr @B, i32 0, i32 2), i64 0, i64 1), align 4, !tbaa !5
  store i32 1, ptr getelementptr inbounds ([2 x i32], ptr getelementptr inbounds (%struct.Matrix, ptr @B, i32 0, i32 2), i64 0, i64 1), align 4, !tbaa !5
  store i32 1, ptr getelementptr inbounds ([2 x i32], ptr getelementptr inbounds (%struct.Matrix, ptr @A, i32 0, i32 2), i64 0, i64 1), align 4, !tbaa !5
  store i32 1, ptr @A, align 4, !tbaa !9
  store i32 2, ptr getelementptr inbounds ([2 x i32], ptr getelementptr inbounds ([2 x [2 x i32]], ptr getelementptr inbounds (%struct.Matrix, ptr @B, i32 0, i32 2), i64 0, i64 1), i64 0, i64 1), align 4, !tbaa !5
  store i32 2, ptr getelementptr inbounds (%struct.Matrix, ptr @B, i32 0, i32 1), align 4, !tbaa !11
  store i32 2, ptr @B, align 4, !tbaa !9
  store i32 2, ptr getelementptr inbounds (%struct.Matrix, ptr @A, i32 0, i32 1), align 4, !tbaa !11
  br label %7

7:                                                ; preds = %15, %0
  %8 = load i32, ptr @n, align 4, !tbaa !5
  %9 = icmp ne i32 %8, 0
  br i1 %9, label %10, label %18

10:                                               ; preds = %7
  %11 = load i32, ptr @n, align 4, !tbaa !5
  %12 = and i32 %11, 1
  %13 = icmp ne i32 %12, 0
  br i1 %13, label %14, label %15

14:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 24, ptr %2) #5
  call void @_ZNK6MatrixmlERKS_(ptr dead_on_unwind writable sret(%struct.Matrix) align 4 %2, ptr noundef nonnull align 4 dereferenceable(24) @A, ptr noundef nonnull align 4 dereferenceable(24) @B)
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 @A, ptr align 4 %2, i64 24, i1 false), !tbaa.struct !12
  call void @llvm.lifetime.end.p0(i64 24, ptr %2) #5
  br label %15

15:                                               ; preds = %14, %10
  call void @llvm.lifetime.start.p0(i64 24, ptr %3) #5
  call void @_ZNK6MatrixmlERKS_(ptr dead_on_unwind writable sret(%struct.Matrix) align 4 %3, ptr noundef nonnull align 4 dereferenceable(24) @B, ptr noundef nonnull align 4 dereferenceable(24) @B)
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 @B, ptr align 4 %3, i64 24, i1 false), !tbaa.struct !12
  call void @llvm.lifetime.end.p0(i64 24, ptr %3) #5
  %16 = load i32, ptr @n, align 4, !tbaa !5
  %17 = ashr i32 %16, 1
  store i32 %17, ptr @n, align 4, !tbaa !5
  br label %7, !llvm.loop !14

18:                                               ; preds = %7
  %19 = load i32, ptr getelementptr inbounds ([2 x i32], ptr getelementptr inbounds (%struct.Matrix, ptr @A, i32 0, i32 2), i64 0, i64 1), align 4, !tbaa !5
  %20 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %19)
  ret i32 0
}

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

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNK6MatrixmlERKS_(ptr dead_on_unwind noalias writable sret(%struct.Matrix) align 4, ptr noundef nonnull align 4 dereferenceable(24), ptr noundef nonnull align 4 dereferenceable(24)) #3 align 2

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #4

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

declare i32 @printf(ptr noundef, ...) #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 = { "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 = { mustprogress 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 #4 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #5 = { 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, !6, i64 0}
!10 = !{!"_ZTS6Matrix", !6, i64 0, !6, i64 4, !7, i64 8}
!11 = !{!10, !6, i64 4}
!12 = !{i64 0, i64 4, !5, i64 4, i64 4, !5, i64 8, i64 16, !13}
!13 = !{!7, !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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"

%struct.Matrix = type { i32, i32, [2 x [2 x i32]] }

@A = external dso_local global %struct.Matrix, align 4
@B = external dso_local global %struct.Matrix, align 4
@n = 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 [4 x i8], align 1

; Function Attrs: mustprogress norecurse nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca %struct.Matrix, align 4
  %2 = alloca %struct.Matrix, align 4
  %3 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n)
  %4 = load i32, ptr @n, align 4, !tbaa !5
  %5 = add nsw i32 %4, -1
  store i32 %5, ptr @n, align 4, !tbaa !5
  store i32 1, ptr getelementptr inbounds (i8, ptr @B, i64 16), align 4, !tbaa !5
  store i32 1, ptr getelementptr inbounds (i8, ptr @B, i64 12), align 4, !tbaa !5
  store i32 1, ptr getelementptr inbounds (i8, ptr @A, i64 12), align 4, !tbaa !5
  store i32 1, ptr @A, align 4, !tbaa !9
  store i32 2, ptr getelementptr inbounds (i8, ptr @B, i64 20), align 4, !tbaa !5
  store i32 2, ptr getelementptr inbounds (i8, ptr @B, i64 4), align 4, !tbaa !11
  store i32 2, ptr @B, align 4, !tbaa !9
  store i32 2, ptr getelementptr inbounds (i8, ptr @A, i64 4), align 4, !tbaa !11
  %.not2 = icmp eq i32 %5, 0
  br i1 %.not2, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %9
  %6 = phi i32 [ %11, %9 ], [ %5, %0 ]
  %7 = and i32 %6, 1
  %.not1 = icmp eq i32 %7, 0
  br i1 %.not1, label %9, label %8

8:                                                ; preds = %.lr.ph
  call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %1) #5
  call void @_ZNK6MatrixmlERKS_(ptr dead_on_unwind nonnull writable sret(%struct.Matrix) align 4 %1, ptr noundef nonnull align 4 dereferenceable(24) @A, ptr noundef nonnull align 4 dereferenceable(24) @B)
  call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 4 dereferenceable(24) @A, ptr noundef nonnull align 4 dereferenceable(24) %1, i64 24, i1 false), !tbaa.struct !12
  call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %1) #5
  br label %9

9:                                                ; preds = %8, %.lr.ph
  call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %2) #5
  call void @_ZNK6MatrixmlERKS_(ptr dead_on_unwind nonnull writable sret(%struct.Matrix) align 4 %2, ptr noundef nonnull align 4 dereferenceable(24) @B, ptr noundef nonnull align 4 dereferenceable(24) @B)
  call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 4 dereferenceable(24) @B, ptr noundef nonnull align 4 dereferenceable(24) %2, i64 24, i1 false), !tbaa.struct !12
  call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %2) #5
  %10 = load i32, ptr @n, align 4, !tbaa !5
  %11 = ashr i32 %10, 1
  store i32 %11, ptr @n, align 4, !tbaa !5
  %.not = icmp ult i32 %10, 2
  br i1 %.not, label %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !14

._crit_edge.loopexit:                             ; preds = %9
  %.pre = load i32, ptr getelementptr inbounds (i8, ptr @A, i64 12), align 4, !tbaa !5
  br label %._crit_edge

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

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

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNK6MatrixmlERKS_(ptr dead_on_unwind noalias writable sret(%struct.Matrix) align 4, ptr noundef nonnull align 4 dereferenceable(24), ptr noundef nonnull align 4 dereferenceable(24)) local_unnamed_addr #3 align 2

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #4

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

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

attributes #0 = { mustprogress 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" }
attributes #2 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { mustprogress 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 #4 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #5 = { 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, !6, i64 0}
!10 = !{!"_ZTS6Matrix", !6, i64 0, !6, i64 4, !7, i64 8}
!11 = !{!10, !6, i64 4}
!12 = !{i64 0, i64 4, !5, i64 4, i64 4, !5, i64 8, i64 16, !13}
!13 = !{!7, !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


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