; LLVM IR from ahr9n/psolving-paradigms :: 4.dynamic-programming/12.strings/CodeForces 1096D - Easy Problem.ll (Z2dpii)

; 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::__cxx11::basic_string" = type { %"struct.std::__cxx11::basic_string<char>::_Alloc_hider", i64, %union.anon }
%"struct.std::__cxx11::basic_string<char>::_Alloc_hider" = type { ptr }
%union.anon = type { i64, [8 x i8] }

@a = external dso_local global [200005 x i64], align 16
@mem = external dso_local global [200005 x [4 x i64]], align 16
@_Z1sB5cxx11 = external dso_local global %"class.std::__cxx11::basic_string", align 8
@_Z4hardB5cxx11 = external dso_local global %"class.std::__cxx11::basic_string", align 8

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_Z2dpii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i64, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i64, align 8
  %9 = alloca i64, align 8
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  %10 = load i32, ptr %4, align 4, !tbaa !5
  %11 = icmp eq i32 %10, -1
  br i1 %11, label %12, label %13

12:                                               ; preds = %2
  store i64 0, ptr %3, align 8
  br label %70

13:                                               ; preds = %2
  %14 = load i32, ptr %5, align 4, !tbaa !5
  %15 = icmp eq i32 %14, -1
  br i1 %15, label %16, label %17

16:                                               ; preds = %13
  store i64 1000000000000000000, ptr %3, align 8
  br label %70

17:                                               ; preds = %13
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #4
  %18 = load i32, ptr %4, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [200005 x [4 x i64]], ptr @mem, i64 0, i64 %19
  %21 = load i32, ptr %5, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [4 x i64], ptr %20, i64 0, i64 %22
  store ptr %23, ptr %6, align 8, !tbaa !9
  %24 = load ptr, ptr %6, align 8, !tbaa !9
  %25 = load i64, ptr %24, align 8, !tbaa !11
  %26 = xor i64 %25, -1
  %27 = icmp ne i64 %26, 0
  br i1 %27, label %28, label %31

28:                                               ; preds = %17
  %29 = load ptr, ptr %6, align 8, !tbaa !9
  %30 = load i64, ptr %29, align 8, !tbaa !11
  store i64 %30, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %69

31:                                               ; preds = %17
  %32 = load i32, ptr %4, align 4, !tbaa !5
  %33 = sext i32 %32 to i64
  %34 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1sB5cxx11, i64 noundef %33)
  %35 = load i8, ptr %34, align 1, !tbaa !13
  %36 = sext i8 %35 to i32
  %37 = load i32, ptr %5, align 4, !tbaa !5
  %38 = sext i32 %37 to i64
  %39 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z4hardB5cxx11, i64 noundef %38)
  %40 = load i8, ptr %39, align 1, !tbaa !13
  %41 = sext i8 %40 to i32
  %42 = icmp eq i32 %36, %41
  br i1 %42, label %43, label %60

43:                                               ; preds = %31
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %44 = load i32, ptr %4, align 4, !tbaa !5
  %45 = sub nsw i32 %44, 1
  %46 = load i32, ptr %5, align 4, !tbaa !5
  %47 = call noundef i64 @_Z2dpii(i32 noundef %45, i32 noundef %46)
  %48 = load i32, ptr %4, align 4, !tbaa !5
  %49 = sext i32 %48 to i64
  %50 = getelementptr inbounds [200005 x i64], ptr @a, i64 0, i64 %49
  %51 = load i64, ptr %50, align 8, !tbaa !11
  %52 = add nsw i64 %47, %51
  store i64 %52, ptr %8, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #4
  %53 = load i32, ptr %4, align 4, !tbaa !5
  %54 = load i32, ptr %5, align 4, !tbaa !5
  %55 = sub nsw i32 %54, 1
  %56 = call noundef i64 @_Z2dpii(i32 noundef %53, i32 noundef %55)
  store i64 %56, ptr %9, align 8, !tbaa !11
  %57 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3minIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %8, ptr noundef nonnull align 8 dereferenceable(8) %9)
  %58 = load i64, ptr %57, align 8, !tbaa !11
  %59 = load ptr, ptr %6, align 8, !tbaa !9
  store i64 %58, ptr %59, align 8, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  br label %66

60:                                               ; preds = %31
  %61 = load i32, ptr %4, align 4, !tbaa !5
  %62 = sub nsw i32 %61, 1
  %63 = load i32, ptr %5, align 4, !tbaa !5
  %64 = call noundef i64 @_Z2dpii(i32 noundef %62, i32 noundef %63)
  %65 = load ptr, ptr %6, align 8, !tbaa !9
  store i64 %64, ptr %65, align 8, !tbaa !11
  br label %66

66:                                               ; preds = %60, %43
  %67 = load ptr, ptr %6, align 8, !tbaa !9
  %68 = load i64, ptr %67, align 8, !tbaa !11
  store i64 %68, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %69

69:                                               ; preds = %66, %28
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #4
  br label %70

70:                                               ; preds = %69, %16, %12
  %71 = load i64, ptr %3, align 8
  ret i64 %71
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) #2 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3minIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) #3

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 = { 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 #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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long long", !7, i64 0}
!13 = !{!7, !7, i64 0}


; 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::__cxx11::basic_string" = type { %"struct.std::__cxx11::basic_string<char>::_Alloc_hider", i64, %union.anon }
%"struct.std::__cxx11::basic_string<char>::_Alloc_hider" = type { ptr }
%union.anon = type { i64, [8 x i8] }

@a = external dso_local local_unnamed_addr global [200005 x i64], align 16
@mem = external dso_local local_unnamed_addr global [200005 x [4 x i64]], align 16
@_Z1sB5cxx11 = external dso_local global %"class.std::__cxx11::basic_string", align 8
@_Z4hardB5cxx11 = external dso_local global %"class.std::__cxx11::basic_string", align 8

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z2dpii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = icmp eq i32 %0, -1
  br i1 %5, label %33, label %6

6:                                                ; preds = %2
  %7 = icmp eq i32 %1, -1
  br i1 %7, label %33, label %8

8:                                                ; preds = %6
  %9 = sext i32 %0 to i64
  %10 = sext i32 %1 to i64
  %11 = getelementptr inbounds [200005 x [4 x i64]], ptr @mem, i64 0, i64 %9, i64 %10
  %12 = load i64, ptr %11, align 8, !tbaa !5
  %.not = icmp eq i64 %12, -1
  br i1 %.not, label %13, label %33

13:                                               ; preds = %8
  %14 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1sB5cxx11, i64 noundef %9)
  %15 = load i8, ptr %14, align 1, !tbaa !9
  %16 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z4hardB5cxx11, i64 noundef %10)
  %17 = load i8, ptr %16, align 1, !tbaa !9
  %18 = icmp eq i8 %15, %17
  br i1 %18, label %19, label %29

19:                                               ; preds = %13
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #3
  %20 = add nsw i32 %0, -1
  %21 = tail call noundef i64 @_Z2dpii(i32 noundef %20, i32 noundef %1)
  %22 = getelementptr inbounds [200005 x i64], ptr @a, i64 0, i64 %9
  %23 = load i64, ptr %22, align 8, !tbaa !5
  %24 = add nsw i64 %23, %21
  store i64 %24, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #3
  %25 = add nsw i32 %1, -1
  %26 = tail call noundef i64 @_Z2dpii(i32 noundef %0, i32 noundef %25)
  store i64 %26, ptr %4, align 8, !tbaa !5
  %27 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3minIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %3, ptr noundef nonnull align 8 dereferenceable(8) %4)
  %28 = load i64, ptr %27, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #3
  br label %32

29:                                               ; preds = %13
  %30 = add nsw i32 %0, -1
  %31 = tail call noundef i64 @_Z2dpii(i32 noundef %30, i32 noundef %1)
  br label %32

32:                                               ; preds = %29, %19
  %.sink = phi i64 [ %28, %19 ], [ %31, %29 ]
  store i64 %.sink, ptr %11, align 8
  br label %33

33:                                               ; preds = %32, %8, %6, %2
  %.1 = phi i64 [ 0, %2 ], [ 1000000000000000000, %6 ], [ %.sink, %32 ], [ %12, %8 ]
  ret i64 %.1
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) local_unnamed_addr #0 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3minIxERKT_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) #1

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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!7, !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,MergedLoadStoreMotionPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass