; LLVM IR from tangjz/acm-icpc :: 51nod (1365)

; 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
@t = external dso_local global i32, align 4
@n = external dso_local global i64, align 8
@m = external dso_local global i64, align 8
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [9 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z5solvexx(i64 noundef, i64 noundef) #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #1 {
  %1 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  store i32 2, ptr getelementptr inbounds (%struct.Matrix, ptr @A, i32 0, i32 1), align 4, !tbaa !5
  store i32 2, ptr @A, align 4, !tbaa !10
  store i32 1, ptr getelementptr inbounds ([2 x i32], ptr getelementptr inbounds ([2 x [2 x i32]], ptr getelementptr inbounds (%struct.Matrix, ptr @A, i32 0, i32 2), i64 0, i64 1), i64 0, i64 1), align 4, !tbaa !11
  store i32 1, ptr getelementptr inbounds ([2 x [2 x i32]], ptr getelementptr inbounds (%struct.Matrix, ptr @A, i32 0, i32 2), i64 0, i64 1), align 4, !tbaa !11
  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 !11
  %2 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @t)
  br label %3

3:                                                ; preds = %7, %0
  %4 = load i32, ptr @t, align 4, !tbaa !11
  %5 = add nsw i32 %4, -1
  store i32 %5, ptr @t, align 4, !tbaa !11
  %6 = icmp ne i32 %4, 0
  br i1 %6, label %7, label %13

7:                                                ; preds = %3
  %8 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef @n, ptr noundef @m)
  %9 = load i64, ptr @n, align 8, !tbaa !12
  %10 = load i64, ptr @m, align 8, !tbaa !12
  %11 = call noundef i32 @_Z5solvexx(i64 noundef %9, i64 noundef %10)
  %12 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %11)
  br label %3, !llvm.loop !14

13:                                               ; preds = %3
  ret i32 0
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #2

declare i32 @printf(ptr noundef, ...) #2

attributes #0 = { 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 #1 = { 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 #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, !7, i64 4}
!6 = !{!"_ZTS6Matrix", !7, i64 0, !7, i64 4, !8, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!6, !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = !{!13, !13, i64 0}
!13 = !{!"long long", !8, 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 local_unnamed_addr global %struct.Matrix, align 4
@t = external dso_local global i32, align 4
@n = external dso_local global i64, align 8
@m = external dso_local global i64, align 8
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [9 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z5solvexx(i64 noundef, i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #1 {
  store i32 2, ptr getelementptr inbounds (i8, ptr @A, i64 4), align 4, !tbaa !5
  store i32 2, ptr @A, align 4, !tbaa !10
  store i32 1, ptr getelementptr inbounds (i8, ptr @A, i64 20), align 4, !tbaa !11
  store i32 1, ptr getelementptr inbounds (i8, ptr @A, i64 16), align 4, !tbaa !11
  store i32 1, ptr getelementptr inbounds (i8, ptr @A, i64 12), align 4, !tbaa !11
  %1 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @t)
  %2 = load i32, ptr @t, align 4, !tbaa !11
  %3 = add nsw i32 %2, -1
  store i32 %3, ptr @t, align 4, !tbaa !11
  %.not1 = icmp eq i32 %2, 0
  br i1 %.not1, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.lr.ph
  %4 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull @n, ptr noundef nonnull @m)
  %5 = load i64, ptr @n, align 8, !tbaa !12
  %6 = load i64, ptr @m, align 8, !tbaa !12
  %7 = tail call noundef i32 @_Z5solvexx(i64 noundef %5, i64 noundef %6)
  %8 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i32 noundef %7)
  %9 = load i32, ptr @t, align 4, !tbaa !11
  %10 = add nsw i32 %9, -1
  store i32 %10, ptr @t, align 4, !tbaa !11
  %.not = icmp eq i32 %9, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !14

._crit_edge:                                      ; preds = %.lr.ph, %0
  ret i32 0
}

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

attributes #0 = { 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 #1 = { 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 #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, !7, i64 4}
!6 = !{!"_ZTS6Matrix", !7, i64 0, !7, i64 4, !8, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!6, !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = !{!13, !13, i64 0}
!13 = !{!"long long", !8, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


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