; LLVM IR from abeaumont/competitive-programming :: codechef/aug18a/kcompres.ll (Z4qmaxxx)

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

@tree = external dso_local global %"class.std::vector", align 8
@nn = external dso_local global i64, align 8

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIxSaIxEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #1 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) #2

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

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_Z4qmaxxx(i64 noundef %0, i64 noundef %1) #3 {
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !5
  %6 = load i64, ptr @nn, align 8, !tbaa !5
  %7 = load i64, ptr %3, align 8, !tbaa !5
  %8 = add nsw i64 %7, %6
  store i64 %8, ptr %3, align 8, !tbaa !5
  %9 = load i64, ptr @nn, align 8, !tbaa !5
  %10 = load i64, ptr %4, align 8, !tbaa !5
  %11 = add nsw i64 %10, %9
  store i64 %11, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  store i64 0, ptr %5, align 8, !tbaa !5
  br label %12

12:                                               ; preds = %36, %2
  %13 = load i64, ptr %3, align 8, !tbaa !5
  %14 = load i64, ptr %4, align 8, !tbaa !5
  %15 = icmp sle i64 %13, %14
  br i1 %15, label %16, label %41

16:                                               ; preds = %12
  %17 = load i64, ptr %3, align 8, !tbaa !5
  %18 = srem i64 %17, 2
  %19 = icmp ne i64 %18, 0
  br i1 %19, label %20, label %26

20:                                               ; preds = %16
  %21 = load i64, ptr %3, align 8, !tbaa !5
  %22 = add nsw i64 %21, 1
  store i64 %22, ptr %3, align 8, !tbaa !5
  %23 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIxSaIxEEixEm(ptr noundef nonnull align 8 dereferenceable(24) @tree, i64 noundef %21) #4
  %24 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %5, ptr noundef nonnull align 8 dereferenceable(8) %23)
  %25 = load i64, ptr %24, align 8, !tbaa !5
  store i64 %25, ptr %5, align 8, !tbaa !5
  br label %26

26:                                               ; preds = %20, %16
  %27 = load i64, ptr %4, align 8, !tbaa !5
  %28 = srem i64 %27, 2
  %29 = icmp ne i64 %28, 0
  br i1 %29, label %36, label %30

30:                                               ; preds = %26
  %31 = load i64, ptr %4, align 8, !tbaa !5
  %32 = add nsw i64 %31, -1
  store i64 %32, ptr %4, align 8, !tbaa !5
  %33 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIxSaIxEEixEm(ptr noundef nonnull align 8 dereferenceable(24) @tree, i64 noundef %31) #4
  %34 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %5, ptr noundef nonnull align 8 dereferenceable(8) %33)
  %35 = load i64, ptr %34, align 8, !tbaa !5
  store i64 %35, ptr %5, align 8, !tbaa !5
  br label %36

36:                                               ; preds = %30, %26
  %37 = load i64, ptr %3, align 8, !tbaa !5
  %38 = sdiv i64 %37, 2
  store i64 %38, ptr %3, align 8, !tbaa !5
  %39 = load i64, ptr %4, align 8, !tbaa !5
  %40 = sdiv i64 %39, 2
  store i64 %40, ptr %4, align 8, !tbaa !5
  br label %12, !llvm.loop !9

41:                                               ; preds = %12
  %42 = load i64, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #4
  ret i64 %42
}

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 = { inlinehint 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 #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 = { 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<long long, std::allocator<long long>>::_Vector_impl" }
%"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl" = type { %"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl_data" }
%"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl_data" = type { ptr, ptr, ptr }

@tree = external dso_local global %"class.std::vector", align 8
@nn = external dso_local local_unnamed_addr global i64, align 8

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIxSaIxEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #1 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #2

; Function Attrs: mustprogress 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 noundef i64 @_Z4qmaxxx(i64 noundef %0, i64 noundef %1) local_unnamed_addr #1 {
  %3 = alloca i64, align 8
  %4 = load i64, ptr @nn, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #3
  store i64 0, ptr %3, align 8, !tbaa !5
  %.not14 = icmp sgt i64 %0, %1
  br i1 %.not14, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %2
  %5 = add nsw i64 %4, %1
  %6 = add nsw i64 %4, %0
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %22
  %7 = phi i64 [ %23, %22 ], [ 0, %.lr.ph.preheader ]
  %.016 = phi i64 [ %25, %22 ], [ %5, %.lr.ph.preheader ]
  %.01015 = phi i64 [ %24, %22 ], [ %6, %.lr.ph.preheader ]
  %8 = and i64 %.01015, 1
  %.not12 = icmp eq i64 %8, 0
  br i1 %.not12, label %14, label %9

9:                                                ; preds = %.lr.ph
  %10 = add nsw i64 %.01015, 1
  %11 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIxSaIxEEixEm(ptr noundef nonnull align 8 dereferenceable(24) @tree, i64 noundef %.01015) #3
  %12 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %3, ptr noundef nonnull align 8 dereferenceable(8) %11)
  %13 = load i64, ptr %12, align 8, !tbaa !5
  store i64 %13, ptr %3, align 8, !tbaa !5
  br label %14

14:                                               ; preds = %9, %.lr.ph
  %15 = phi i64 [ %13, %9 ], [ %7, %.lr.ph ]
  %.111 = phi i64 [ %10, %9 ], [ %.01015, %.lr.ph ]
  %16 = and i64 %.016, 1
  %.not13 = icmp eq i64 %16, 0
  br i1 %.not13, label %17, label %22

17:                                               ; preds = %14
  %18 = add nsw i64 %.016, -1
  %19 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIxSaIxEEixEm(ptr noundef nonnull align 8 dereferenceable(24) @tree, i64 noundef %.016) #3
  %20 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %3, ptr noundef nonnull align 8 dereferenceable(8) %19)
  %21 = load i64, ptr %20, align 8, !tbaa !5
  store i64 %21, ptr %3, align 8, !tbaa !5
  br label %22

22:                                               ; preds = %17, %14
  %23 = phi i64 [ %15, %14 ], [ %21, %17 ]
  %.1 = phi i64 [ %.016, %14 ], [ %18, %17 ]
  %24 = sdiv i64 %.111, 2
  %25 = sdiv i64 %.1, 2
  %.not = icmp sgt i64 %24, %25
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %22, %2
  %26 = phi i64 [ 0, %2 ], [ %23, %22 ]
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #3
  ret i64 %26
}

attributes #0 = { mustprogress 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 = { inlinehint 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 #3 = { 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: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass