; LLVM IR from eyangch/competitive-programming :: AtCoder/abc270/f.ll (Z3rmXv)

; 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"

%"class.std::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<std::pair<long long, long long>, std::allocator<std::pair<long long, long long>>>::_Vector_impl" }
%"struct.std::_Vector_base<std::pair<long long, long long>, std::allocator<std::pair<long long, long long>>>::_Vector_impl" = type { %"struct.std::_Vector_base<std::pair<long long, long long>, std::allocator<std::pair<long long, long long>>>::_Vector_impl_data" }
%"struct.std::_Vector_base<std::pair<long long, long long>, std::allocator<std::pair<long long, long long>>>::_Vector_impl_data" = type { ptr, ptr, ptr }

@N = external dso_local global i64, align 8
@G = external dso_local global [200002 x %"class.std::vector"], align 16

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z3rmXv() #1 {
  %1 = alloca i64, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %1) #2
  store i64 0, ptr %1, align 8, !tbaa !5
  br label %2

2:                                                ; preds = %12, %0
  %3 = load i64, ptr %1, align 8, !tbaa !5
  %4 = load i64, ptr @N, align 8, !tbaa !5
  %5 = icmp slt i64 %3, %4
  br i1 %5, label %7, label %6

6:                                                ; preds = %2
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #2
  br label %15

7:                                                ; preds = %2
  %8 = load i64, ptr %1, align 8, !tbaa !5
  %9 = getelementptr inbounds [200002 x %"class.std::vector"], ptr @G, i64 0, i64 %8
  call void @_ZNSt6vectorISt4pairIxxESaIS1_EE8pop_backEv(ptr noundef nonnull align 8 dereferenceable(24) %9) #2
  %10 = load i64, ptr @N, align 8, !tbaa !5
  %11 = getelementptr inbounds [200002 x %"class.std::vector"], ptr @G, i64 0, i64 %10
  call void @_ZNSt6vectorISt4pairIxxESaIS1_EE8pop_backEv(ptr noundef nonnull align 8 dereferenceable(24) %11) #2
  br label %12

12:                                               ; preds = %7
  %13 = load i64, ptr %1, align 8, !tbaa !5
  %14 = add nsw i64 %13, 1
  store i64 %14, ptr %1, align 8, !tbaa !5
  br label %2, !llvm.loop !9

15:                                               ; preds = %6
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorISt4pairIxxESaIS1_EE8pop_backEv(ptr noundef nonnull align 8 dereferenceable(24)) #1 align 2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { 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 = !{!"long long", !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"

%"class.std::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<std::pair<long long, long long>, std::allocator<std::pair<long long, long long>>>::_Vector_impl" }
%"struct.std::_Vector_base<std::pair<long long, long long>, std::allocator<std::pair<long long, long long>>>::_Vector_impl" = type { %"struct.std::_Vector_base<std::pair<long long, long long>, std::allocator<std::pair<long long, long long>>>::_Vector_impl_data" }
%"struct.std::_Vector_base<std::pair<long long, long long>, std::allocator<std::pair<long long, long long>>>::_Vector_impl_data" = type { ptr, ptr, ptr }

@N = external dso_local local_unnamed_addr global i64, align 8
@G = external dso_local global [200002 x %"class.std::vector"], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z3rmXv() local_unnamed_addr #0 {
  %1 = load i64, ptr @N, align 8, !tbaa !5
  %2 = icmp sgt i64 %1, 0
  br i1 %2, label %.lr.ph, label %._crit_edge

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

.lr.ph:                                           ; preds = %0, %.lr.ph
  %.03 = phi i64 [ %6, %.lr.ph ], [ 0, %0 ]
  %3 = getelementptr inbounds [200002 x %"class.std::vector"], ptr @G, i64 0, i64 %.03
  tail call void @_ZNSt6vectorISt4pairIxxESaIS1_EE8pop_backEv(ptr noundef nonnull align 8 dereferenceable(24) %3) #1
  %4 = load i64, ptr @N, align 8, !tbaa !5
  %5 = getelementptr inbounds [200002 x %"class.std::vector"], ptr @G, i64 0, i64 %4
  tail call void @_ZNSt6vectorISt4pairIxxESaIS1_EE8pop_backEv(ptr noundef nonnull align 8 dereferenceable(24) %5) #1
  %6 = add nuw nsw i64 %.03, 1
  %7 = load i64, ptr @N, align 8, !tbaa !5
  %8 = icmp slt i64 %6, %7
  br i1 %8, label %.lr.ph, label %._crit_edge, !llvm.loop !9
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorISt4pairIxxESaIS1_EE8pop_backEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

attributes #0 = { 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 #1 = { 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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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