; LLVM IR from eyangch/competitive-programming :: CSES/Dynamic_Programming/edit_distance.ll (Z3dfsii)

; 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] }

@dp = external dso_local global [5000 x [5000 x i32]], align 16
@_Z1aB5cxx11 = external dso_local global %"class.std::__cxx11::basic_string", align 8
@_Z1bB5cxx11 = external dso_local global %"class.std::__cxx11::basic_string", align 8

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z3dfsii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = icmp eq i32 %9, -1
  br i1 %10, label %11, label %14

11:                                               ; preds = %2
  %12 = load i32, ptr %5, align 4, !tbaa !5
  %13 = add nsw i32 %12, 1
  store i32 %13, ptr %3, align 4
  br label %78

14:                                               ; preds = %2
  %15 = load i32, ptr %5, align 4, !tbaa !5
  %16 = icmp eq i32 %15, -1
  br i1 %16, label %17, label %20

17:                                               ; preds = %14
  %18 = load i32, ptr %4, align 4, !tbaa !5
  %19 = add nsw i32 %18, 1
  store i32 %19, ptr %3, align 4
  br label %78

20:                                               ; preds = %14
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [5000 x [5000 x i32]], ptr @dp, i64 0, i64 %22
  %24 = load i32, ptr %5, align 4, !tbaa !5
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds [5000 x i32], ptr %23, i64 0, i64 %25
  %27 = load i32, ptr %26, align 4, !tbaa !5
  %28 = xor i32 %27, -1
  %29 = icmp ne i32 %28, 0
  br i1 %29, label %30, label %38

30:                                               ; preds = %20
  %31 = load i32, ptr %4, align 4, !tbaa !5
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds [5000 x [5000 x i32]], ptr @dp, i64 0, i64 %32
  %34 = load i32, ptr %5, align 4, !tbaa !5
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds [5000 x i32], ptr %33, i64 0, i64 %35
  %37 = load i32, ptr %36, align 4, !tbaa !5
  store i32 %37, ptr %3, align 4
  br label %78

38:                                               ; preds = %20
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #4
  %39 = load i32, ptr %4, align 4, !tbaa !5
  %40 = sext i32 %39 to i64
  %41 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1aB5cxx11, i64 noundef %40)
  %42 = load i8, ptr %41, align 1, !tbaa !9
  %43 = sext i8 %42 to i32
  %44 = load i32, ptr %5, align 4, !tbaa !5
  %45 = sext i32 %44 to i64
  %46 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1bB5cxx11, i64 noundef %45)
  %47 = load i8, ptr %46, align 1, !tbaa !9
  %48 = sext i8 %47 to i32
  %49 = icmp ne i32 %43, %48
  %50 = zext i1 %49 to i32
  %51 = load i32, ptr %4, align 4, !tbaa !5
  %52 = sub nsw i32 %51, 1
  %53 = load i32, ptr %5, align 4, !tbaa !5
  %54 = sub nsw i32 %53, 1
  %55 = call noundef i32 @_Z3dfsii(i32 noundef %52, i32 noundef %54)
  %56 = add nsw i32 %50, %55
  store i32 %56, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  %57 = load i32, ptr %4, align 4, !tbaa !5
  %58 = sub nsw i32 %57, 1
  %59 = load i32, ptr %5, align 4, !tbaa !5
  %60 = call noundef i32 @_Z3dfsii(i32 noundef %58, i32 noundef %59)
  %61 = add nsw i32 %60, 1
  store i32 %61, ptr %7, align 4, !tbaa !5
  %62 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %6, ptr noundef nonnull align 4 dereferenceable(4) %7)
  %63 = load i32, ptr %62, align 4, !tbaa !5
  store i32 %63, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #4
  %64 = load i32, ptr %4, align 4, !tbaa !5
  %65 = load i32, ptr %5, align 4, !tbaa !5
  %66 = sub nsw i32 %65, 1
  %67 = call noundef i32 @_Z3dfsii(i32 noundef %64, i32 noundef %66)
  %68 = add nsw i32 %67, 1
  store i32 %68, ptr %8, align 4, !tbaa !5
  %69 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %6, ptr noundef nonnull align 4 dereferenceable(4) %8)
  %70 = load i32, ptr %69, align 4, !tbaa !5
  store i32 %70, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #4
  %71 = load i32, ptr %6, align 4, !tbaa !5
  %72 = load i32, ptr %4, align 4, !tbaa !5
  %73 = sext i32 %72 to i64
  %74 = getelementptr inbounds [5000 x [5000 x i32]], ptr @dp, i64 0, i64 %73
  %75 = load i32, ptr %5, align 4, !tbaa !5
  %76 = sext i32 %75 to i64
  %77 = getelementptr inbounds [5000 x i32], ptr %74, i64 0, i64 %76
  store i32 %71, ptr %77, align 4, !tbaa !5
  store i32 %71, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  br label %78

78:                                               ; preds = %38, %30, %17, %11
  %79 = load i32, ptr %3, align 4
  ret i32 %79
}

; 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 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #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 = !{!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] }

@dp = external dso_local local_unnamed_addr global [5000 x [5000 x i32]], align 16
@_Z1aB5cxx11 = external dso_local global %"class.std::__cxx11::basic_string", align 8
@_Z1bB5cxx11 = external dso_local global %"class.std::__cxx11::basic_string", align 8

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z3dfsii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = icmp eq i32 %0, -1
  br i1 %6, label %7, label %9

7:                                                ; preds = %2
  %8 = add nsw i32 %1, 1
  br label %37

9:                                                ; preds = %2
  %10 = icmp eq i32 %1, -1
  br i1 %10, label %11, label %13

11:                                               ; preds = %9
  %12 = add nuw nsw i32 %0, 1
  br label %37

13:                                               ; preds = %9
  %14 = sext i32 %0 to i64
  %15 = sext i32 %1 to i64
  %16 = getelementptr inbounds [5000 x [5000 x i32]], ptr @dp, i64 0, i64 %14, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %.not = icmp eq i32 %17, -1
  br i1 %.not, label %18, label %37

18:                                               ; preds = %13
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #3
  %19 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1aB5cxx11, i64 noundef %14)
  %20 = load i8, ptr %19, align 1, !tbaa !9
  %21 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1bB5cxx11, i64 noundef %15)
  %22 = load i8, ptr %21, align 1, !tbaa !9
  %23 = icmp ne i8 %20, %22
  %24 = zext i1 %23 to i32
  %25 = add nsw i32 %0, -1
  %26 = add nsw i32 %1, -1
  %27 = tail call noundef i32 @_Z3dfsii(i32 noundef %25, i32 noundef %26)
  %28 = add nsw i32 %27, %24
  store i32 %28, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #3
  %29 = tail call noundef i32 @_Z3dfsii(i32 noundef %25, i32 noundef %1)
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %4, align 4, !tbaa !5
  %31 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %3, ptr noundef nonnull align 4 dereferenceable(4) %4)
  %32 = load i32, ptr %31, align 4, !tbaa !5
  store i32 %32, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %5) #3
  %33 = call noundef i32 @_Z3dfsii(i32 noundef %0, i32 noundef %26)
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %5, align 4, !tbaa !5
  %35 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %3, ptr noundef nonnull align 4 dereferenceable(4) %5)
  %36 = load i32, ptr %35, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %5) #3
  store i32 %36, ptr %16, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #3
  br label %37

37:                                               ; preds = %13, %18, %11, %7
  %.0 = phi i32 [ %8, %7 ], [ %12, %11 ], [ %36, %18 ], [ %17, %13 ]
  ret i32 %.0
}

; 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 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!7, !7, i64 0}


; Effective O3 passes: DSEPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass