; LLVM IR from devparthgarg/Data-Structures-and-Algorithms :: 21. Dynamic Programming/03 Longest Common Subsequence/03c Longest Common Subsequenc_c01757d7/Z3lcsNSt7 (ii)

; 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"

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z3lcsNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_ii(ptr noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3) #0 {
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca ptr, align 8
  %10 = alloca i64, align 8
  %11 = alloca i64, align 8
  %12 = alloca i32, align 4
  %13 = alloca i32, align 4
  %14 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !9
  store i32 %3, ptr %8, align 4, !tbaa !9
  %15 = load i32, ptr %7, align 4, !tbaa !9
  %16 = add nsw i32 %15, 1
  %17 = zext i32 %16 to i64
  %18 = load i32, ptr %8, align 4, !tbaa !9
  %19 = add nsw i32 %18, 1
  %20 = zext i32 %19 to i64
  %21 = call ptr @llvm.stacksave.p0()
  store ptr %21, ptr %9, align 8
  %22 = mul nuw i64 %17, %20
  %23 = alloca i32, i64 %22, align 16
  store i64 %17, ptr %10, align 8
  store i64 %20, ptr %11, align 8
  %24 = mul nuw i64 %17, %20
  %25 = mul nuw i64 4, %24
  call void @llvm.memset.p0.i64(ptr align 16 %23, i8 0, i64 %25, i1 false)
  call void @llvm.lifetime.start.p0(i64 4, ptr %12) #6
  store i32 1, ptr %12, align 4, !tbaa !9
  br label %26

26:                                               ; preds = %101, %4
  %27 = load i32, ptr %12, align 4, !tbaa !9
  %28 = load i32, ptr %7, align 4, !tbaa !9
  %29 = icmp sle i32 %27, %28
  br i1 %29, label %31, label %30

30:                                               ; preds = %26
  store i32 2, ptr %13, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %12) #6
  br label %104

31:                                               ; preds = %26
  call void @llvm.lifetime.start.p0(i64 4, ptr %14) #6
  store i32 1, ptr %14, align 4, !tbaa !9
  br label %32

32:                                               ; preds = %97, %31
  %33 = load i32, ptr %14, align 4, !tbaa !9
  %34 = load i32, ptr %8, align 4, !tbaa !9
  %35 = icmp sle i32 %33, %34
  br i1 %35, label %37, label %36

36:                                               ; preds = %32
  store i32 5, ptr %13, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %14) #6
  br label %100

37:                                               ; preds = %32
  %38 = load i32, ptr %12, align 4, !tbaa !9
  %39 = sub nsw i32 %38, 1
  %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) %0, i64 noundef %40)
  %42 = load i8, ptr %41, align 1, !tbaa !11
  %43 = sext i8 %42 to i32
  %44 = load i32, ptr %14, align 4, !tbaa !9
  %45 = sub nsw i32 %44, 1
  %46 = sext i32 %45 to i64
  %47 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %46)
  %48 = load i8, ptr %47, align 1, !tbaa !11
  %49 = sext i8 %48 to i32
  %50 = icmp eq i32 %43, %49
  br i1 %50, label %51, label %70

51:                                               ; preds = %37
  %52 = load i32, ptr %12, align 4, !tbaa !9
  %53 = sub nsw i32 %52, 1
  %54 = sext i32 %53 to i64
  %55 = mul nsw i64 %54, %20
  %56 = getelementptr inbounds i32, ptr %23, i64 %55
  %57 = load i32, ptr %14, align 4, !tbaa !9
  %58 = sub nsw i32 %57, 1
  %59 = sext i32 %58 to i64
  %60 = getelementptr inbounds i32, ptr %56, i64 %59
  %61 = load i32, ptr %60, align 4, !tbaa !9
  %62 = add nsw i32 1, %61
  %63 = load i32, ptr %12, align 4, !tbaa !9
  %64 = sext i32 %63 to i64
  %65 = mul nsw i64 %64, %20
  %66 = getelementptr inbounds i32, ptr %23, i64 %65
  %67 = load i32, ptr %14, align 4, !tbaa !9
  %68 = sext i32 %67 to i64
  %69 = getelementptr inbounds i32, ptr %66, i64 %68
  store i32 %62, ptr %69, align 4, !tbaa !9
  br label %96

70:                                               ; preds = %37
  %71 = load i32, ptr %12, align 4, !tbaa !9
  %72 = sub nsw i32 %71, 1
  %73 = sext i32 %72 to i64
  %74 = mul nsw i64 %73, %20
  %75 = getelementptr inbounds i32, ptr %23, i64 %74
  %76 = load i32, ptr %14, align 4, !tbaa !9
  %77 = sext i32 %76 to i64
  %78 = getelementptr inbounds i32, ptr %75, i64 %77
  %79 = load i32, ptr %12, align 4, !tbaa !9
  %80 = sext i32 %79 to i64
  %81 = mul nsw i64 %80, %20
  %82 = getelementptr inbounds i32, ptr %23, i64 %81
  %83 = load i32, ptr %14, align 4, !tbaa !9
  %84 = sub nsw i32 %83, 1
  %85 = sext i32 %84 to i64
  %86 = getelementptr inbounds i32, ptr %82, i64 %85
  %87 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %78, ptr noundef nonnull align 4 dereferenceable(4) %86)
  %88 = load i32, ptr %87, align 4, !tbaa !9
  %89 = load i32, ptr %12, align 4, !tbaa !9
  %90 = sext i32 %89 to i64
  %91 = mul nsw i64 %90, %20
  %92 = getelementptr inbounds i32, ptr %23, i64 %91
  %93 = load i32, ptr %14, align 4, !tbaa !9
  %94 = sext i32 %93 to i64
  %95 = getelementptr inbounds i32, ptr %92, i64 %94
  store i32 %88, ptr %95, align 4, !tbaa !9
  br label %96

96:                                               ; preds = %70, %51
  br label %97

97:                                               ; preds = %96
  %98 = load i32, ptr %14, align 4, !tbaa !9
  %99 = add nsw i32 %98, 1
  store i32 %99, ptr %14, align 4, !tbaa !9
  br label %32, !llvm.loop !12

100:                                              ; preds = %36
  br label %101

101:                                              ; preds = %100
  %102 = load i32, ptr %12, align 4, !tbaa !9
  %103 = add nsw i32 %102, 1
  store i32 %103, ptr %12, align 4, !tbaa !9
  br label %26, !llvm.loop !14

104:                                              ; preds = %30
  %105 = load i32, ptr %7, align 4, !tbaa !9
  %106 = sext i32 %105 to i64
  %107 = mul nsw i64 %106, %20
  %108 = getelementptr inbounds i32, ptr %23, i64 %107
  %109 = load i32, ptr %8, align 4, !tbaa !9
  %110 = sext i32 %109 to i64
  %111 = getelementptr inbounds i32, ptr %108, i64 %110
  %112 = load i32, ptr %111, align 4, !tbaa !9
  store i32 1, ptr %13, align 4
  %113 = load ptr, ptr %9, align 8
  call void @llvm.stackrestore.p0(ptr %113)
  ret i32 %112
}

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #1

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #3

; 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) #4 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #5

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #3

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #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 }
attributes #2 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #3 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { 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 #5 = { 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 #6 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = distinct !{!14, !13}


; 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"

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z3lcsNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_ii(ptr noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = add i32 %2, 1
  %6 = zext i32 %5 to i64
  %7 = add i32 %3, 1
  %8 = zext i32 %7 to i64
  %9 = mul nuw i64 %8, %6
  %10 = alloca i32, i64 %9, align 16
  %11 = shl nuw i64 %9, 2
  call void @llvm.memset.p0.i64(ptr nonnull align 16 %10, i8 0, i64 %11, i1 false)
  %.not27 = icmp slt i32 %2, 1
  %.not2425 = icmp slt i32 %3, 1
  %or.cond = or i1 %.not27, %.not2425
  br i1 %or.cond, label %._crit_edge29, label %.preheader

.preheader:                                       ; preds = %4, %._crit_edge
  %indvars.iv32 = phi i64 [ %indvars.iv.next33, %._crit_edge ], [ 1, %4 ]
  %12 = add nsw i64 %indvars.iv32, -1
  %13 = mul nuw nsw i64 %12, %8
  %14 = getelementptr inbounds i32, ptr %10, i64 %13
  %15 = mul nuw nsw i64 %indvars.iv32, %8
  %16 = getelementptr inbounds i32, ptr %10, i64 %15
  br label %23

._crit_edge29:                                    ; preds = %._crit_edge, %4
  %17 = sext i32 %2 to i64
  %18 = mul nsw i64 %8, %17
  %19 = getelementptr inbounds i32, ptr %10, i64 %18
  %20 = sext i32 %3 to i64
  %21 = getelementptr inbounds i32, ptr %19, i64 %20
  %22 = load i32, ptr %21, align 4, !tbaa !5
  ret i32 %22

._crit_edge:                                      ; preds = %39
  %indvars.iv.next33 = add nuw nsw i64 %indvars.iv32, 1
  %exitcond36.not = icmp eq i64 %indvars.iv.next33, %6
  br i1 %exitcond36.not, label %._crit_edge29, label %.preheader, !llvm.loop !9

23:                                               ; preds = %.preheader, %39
  %indvars.iv = phi i64 [ 1, %.preheader ], [ %indvars.iv.next, %39 ]
  %24 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %12)
  %25 = load i8, ptr %24, align 1, !tbaa !11
  %26 = add nsw i64 %indvars.iv, -1
  %27 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %26)
  %28 = load i8, ptr %27, align 1, !tbaa !11
  %29 = icmp eq i8 %25, %28
  br i1 %29, label %30, label %34

30:                                               ; preds = %23
  %31 = getelementptr inbounds i32, ptr %14, i64 %26
  %32 = load i32, ptr %31, align 4, !tbaa !5
  %33 = add nsw i32 %32, 1
  br label %39

34:                                               ; preds = %23
  %35 = getelementptr inbounds i32, ptr %14, i64 %indvars.iv
  %36 = getelementptr inbounds i32, ptr %16, i64 %26
  %37 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %35, ptr noundef nonnull align 4 dereferenceable(4) %36)
  %38 = load i32, ptr %37, align 4, !tbaa !5
  br label %39

39:                                               ; preds = %30, %34
  %.sink = phi i32 [ %33, %30 ], [ %38, %34 ]
  %40 = getelementptr inbounds i32, ptr %16, i64 %indvars.iv
  store i32 %.sink, ptr %40, align 4, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %8
  br i1 %exitcond.not, label %._crit_edge, label %23, !llvm.loop !12
}

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #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 @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #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 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: write) }
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" }

!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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !10}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyCFGPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass