; LLVM IR from tangjz/acm-icpc :: luogu (1306)

; 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 i64]] }

@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@ans = external dso_local global %struct.Matrix, align 8
@sum = external dso_local global %struct.Matrix, align 8
@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [7 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 8
  %3 = alloca %struct.Matrix, align 8
  store i32 0, ptr %1, align 4
  %4 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n, ptr noundef @m)
  %5 = load i32, ptr @n, align 4, !tbaa !5
  %6 = load i32, ptr @m, align 4, !tbaa !5
  %7 = call noundef i32 @_Z3gcdii(i32 noundef %5, i32 noundef %6)
  store i32 %7, ptr @n, align 4, !tbaa !5
  %8 = load i32, ptr @n, align 4, !tbaa !5
  %9 = icmp sle i32 %8, 2
  br i1 %9, label %10, label %12

10:                                               ; preds = %0
  %11 = call i32 @puts(ptr noundef @.str.2)
  br label %29

12:                                               ; preds = %0
  %13 = load i32, ptr @n, align 4, !tbaa !5
  %14 = sub nsw i32 %13, 2
  store i32 %14, ptr @n, align 4, !tbaa !5
  store i32 1, ptr @ans, align 8, !tbaa !9
  store i32 2, ptr getelementptr inbounds (%struct.Matrix, ptr @ans, i32 0, i32 1), align 4, !tbaa !11
  store i64 1, ptr getelementptr inbounds ([2 x i64], ptr getelementptr inbounds (%struct.Matrix, ptr @ans, i32 0, i32 2), i64 0, i64 1), align 8, !tbaa !12
  store i64 1, ptr getelementptr inbounds (%struct.Matrix, ptr @ans, i32 0, i32 2), align 8, !tbaa !12
  store i32 2, ptr getelementptr inbounds (%struct.Matrix, ptr @sum, i32 0, i32 1), align 4, !tbaa !11
  store i32 2, ptr @sum, align 8, !tbaa !9
  store i64 1, ptr getelementptr inbounds ([2 x i64], ptr getelementptr inbounds ([2 x [2 x i64]], ptr getelementptr inbounds (%struct.Matrix, ptr @sum, i32 0, i32 2), i64 0, i64 1), i64 0, i64 1), align 8, !tbaa !12
  store i64 1, ptr getelementptr inbounds ([2 x [2 x i64]], ptr getelementptr inbounds (%struct.Matrix, ptr @sum, i32 0, i32 2), i64 0, i64 1), align 8, !tbaa !12
  store i64 1, ptr getelementptr inbounds ([2 x i64], ptr getelementptr inbounds (%struct.Matrix, ptr @sum, i32 0, i32 2), i64 0, i64 1), align 8, !tbaa !12
  br label %15

15:                                               ; preds = %23, %12
  %16 = load i32, ptr @n, align 4, !tbaa !5
  %17 = icmp ne i32 %16, 0
  br i1 %17, label %18, label %26

18:                                               ; preds = %15
  %19 = load i32, ptr @n, align 4, !tbaa !5
  %20 = and i32 %19, 1
  %21 = icmp ne i32 %20, 0
  br i1 %21, label %22, label %23

22:                                               ; preds = %18
  call void @llvm.lifetime.start.p0(i64 40, ptr %2) #5
  call void @_ZN6MatrixmLERKS_(ptr dead_on_unwind writable sret(%struct.Matrix) align 8 %2, ptr noundef nonnull align 8 dereferenceable(40) @ans, ptr noundef nonnull align 8 dereferenceable(40) @sum)
  call void @llvm.lifetime.end.p0(i64 40, ptr %2) #5
  br label %23

23:                                               ; preds = %22, %18
  call void @llvm.lifetime.start.p0(i64 40, ptr %3) #5
  call void @_ZN6MatrixmLERKS_(ptr dead_on_unwind writable sret(%struct.Matrix) align 8 %3, ptr noundef nonnull align 8 dereferenceable(40) @sum, ptr noundef nonnull align 8 dereferenceable(40) @sum)
  call void @llvm.lifetime.end.p0(i64 40, ptr %3) #5
  %24 = load i32, ptr @n, align 4, !tbaa !5
  %25 = ashr i32 %24, 1
  store i32 %25, ptr @n, align 4, !tbaa !5
  br label %15, !llvm.loop !14

26:                                               ; preds = %15
  %27 = load i64, ptr getelementptr inbounds ([2 x i64], ptr getelementptr inbounds (%struct.Matrix, ptr @ans, i32 0, i32 2), i64 0, i64 1), align 8, !tbaa !12
  %28 = call i32 (ptr, ...) @printf(ptr noundef @.str.3, i64 noundef %27)
  br label %29

29:                                               ; preds = %26, %10
  %30 = load i32, ptr %1, align 4
  ret i32 %30
}

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

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef i32 @_Z3gcdii(i32 noundef, i32 noundef) #2

declare i32 @puts(ptr noundef) #1

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN6MatrixmLERKS_(ptr dead_on_unwind noalias writable sret(%struct.Matrix) align 8, ptr noundef nonnull align 8 dereferenceable(40), ptr noundef nonnull align 8 dereferenceable(40)) #3 align 2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #4

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #4

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 = { 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 #3 = { 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 #4 = { nocallback nofree nosync 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 = !{!13, !13, i64 0}
!13 = !{!"long long", !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 i64]] }

@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@ans = external dso_local global %struct.Matrix, align 8
@sum = external dso_local global %struct.Matrix, align 8
@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [7 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca %struct.Matrix, align 8
  %2 = alloca %struct.Matrix, align 8
  %3 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n, ptr noundef nonnull @m)
  %4 = load i32, ptr @n, align 4, !tbaa !5
  %5 = load i32, ptr @m, align 4, !tbaa !5
  %6 = tail call noundef i32 @_Z3gcdii(i32 noundef %4, i32 noundef %5)
  store i32 %6, ptr @n, align 4, !tbaa !5
  %7 = icmp slt i32 %6, 3
  br i1 %7, label %8, label %.lr.ph.preheader

8:                                                ; preds = %0
  %9 = tail call i32 @puts(ptr noundef nonnull dereferenceable(1) @.str.2)
  br label %18

.lr.ph.preheader:                                 ; preds = %0
  %10 = add nsw i32 %6, -2
  store i32 %10, ptr @n, align 4, !tbaa !5
  store i32 1, ptr @ans, align 8, !tbaa !9
  store i32 2, ptr getelementptr inbounds (i8, ptr @ans, i64 4), align 4, !tbaa !11
  store i64 1, ptr getelementptr inbounds (i8, ptr @ans, i64 16), align 8, !tbaa !12
  store i64 1, ptr getelementptr inbounds (i8, ptr @ans, i64 8), align 8, !tbaa !12
  store i32 2, ptr getelementptr inbounds (i8, ptr @sum, i64 4), align 4, !tbaa !11
  store i32 2, ptr @sum, align 8, !tbaa !9
  store i64 1, ptr getelementptr inbounds (i8, ptr @sum, i64 32), align 8, !tbaa !12
  store i64 1, ptr getelementptr inbounds (i8, ptr @sum, i64 24), align 8, !tbaa !12
  store i64 1, ptr getelementptr inbounds (i8, ptr @sum, i64 16), align 8, !tbaa !12
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %14
  %11 = phi i32 [ %16, %14 ], [ %10, %.lr.ph.preheader ]
  %12 = and i32 %11, 1
  %.not2 = icmp eq i32 %12, 0
  br i1 %.not2, label %14, label %13

13:                                               ; preds = %.lr.ph
  call void @llvm.lifetime.start.p0(i64 40, ptr nonnull %1) #5
  call void @_ZN6MatrixmLERKS_(ptr dead_on_unwind nonnull writable sret(%struct.Matrix) align 8 %1, ptr noundef nonnull align 8 dereferenceable(40) @ans, ptr noundef nonnull align 8 dereferenceable(40) @sum)
  call void @llvm.lifetime.end.p0(i64 40, ptr nonnull %1) #5
  br label %14

14:                                               ; preds = %13, %.lr.ph
  call void @llvm.lifetime.start.p0(i64 40, ptr nonnull %2) #5
  call void @_ZN6MatrixmLERKS_(ptr dead_on_unwind nonnull writable sret(%struct.Matrix) align 8 %2, ptr noundef nonnull align 8 dereferenceable(40) @sum, ptr noundef nonnull align 8 dereferenceable(40) @sum)
  call void @llvm.lifetime.end.p0(i64 40, ptr nonnull %2) #5
  %15 = load i32, ptr @n, align 4, !tbaa !5
  %16 = ashr i32 %15, 1
  store i32 %16, ptr @n, align 4, !tbaa !5
  %.not = icmp ult i32 %15, 2
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !14

._crit_edge:                                      ; preds = %14
  %.pre = load i64, ptr getelementptr inbounds (i8, ptr @ans, i64 16), align 8, !tbaa !12
  %17 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.3, i64 noundef %.pre)
  br label %18

18:                                               ; preds = %._crit_edge, %8
  ret i32 0
}

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

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef i32 @_Z3gcdii(i32 noundef, i32 noundef) local_unnamed_addr #2

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

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN6MatrixmLERKS_(ptr dead_on_unwind noalias writable sret(%struct.Matrix) align 8, ptr noundef nonnull align 8 dereferenceable(40), ptr noundef nonnull align 8 dereferenceable(40)) local_unnamed_addr #3 align 2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #4

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #4

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #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 = { 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 = { 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 #3 = { 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 #4 = { mustprogress nocallback nofree nosync 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 = !{!13, !13, i64 0}
!13 = !{!"long long", !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


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