; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 20. Dynamic Programming/lcs.ll (Z7lcsAlgoPcS_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"

%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str = external hidden unnamed_addr constant [40 x i8], align 1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z7lcsAlgoPcS_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
  call void @llvm.lifetime.start.p0(i64 4, ptr %12) #6
  store i32 0, ptr %12, align 4, !tbaa !9
  br label %24

24:                                               ; preds = %116, %4
  %25 = load i32, ptr %12, align 4, !tbaa !9
  %26 = load i32, ptr %7, align 4, !tbaa !9
  %27 = icmp sle i32 %25, %26
  br i1 %27, label %29, label %28

28:                                               ; preds = %24
  store i32 2, ptr %13, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %12) #6
  br label %119

29:                                               ; preds = %24
  call void @llvm.lifetime.start.p0(i64 4, ptr %14) #6
  store i32 0, ptr %14, align 4, !tbaa !9
  br label %30

30:                                               ; preds = %112, %29
  %31 = load i32, ptr %14, align 4, !tbaa !9
  %32 = load i32, ptr %8, align 4, !tbaa !9
  %33 = icmp sle i32 %31, %32
  br i1 %33, label %35, label %34

34:                                               ; preds = %30
  store i32 5, ptr %13, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %14) #6
  br label %115

35:                                               ; preds = %30
  %36 = load i32, ptr %12, align 4, !tbaa !9
  %37 = icmp eq i32 %36, 0
  br i1 %37, label %41, label %38

38:                                               ; preds = %35
  %39 = load i32, ptr %14, align 4, !tbaa !9
  %40 = icmp eq i32 %39, 0
  br i1 %40, label %41, label %49

41:                                               ; preds = %38, %35
  %42 = load i32, ptr %12, align 4, !tbaa !9
  %43 = sext i32 %42 to i64
  %44 = mul nsw i64 %43, %20
  %45 = getelementptr inbounds i32, ptr %23, i64 %44
  %46 = load i32, ptr %14, align 4, !tbaa !9
  %47 = sext i32 %46 to i64
  %48 = getelementptr inbounds i32, ptr %45, i64 %47
  store i32 0, ptr %48, align 4, !tbaa !9
  br label %111

49:                                               ; preds = %38
  %50 = load ptr, ptr %5, align 8, !tbaa !5
  %51 = load i32, ptr %12, align 4, !tbaa !9
  %52 = sub nsw i32 %51, 1
  %53 = sext i32 %52 to i64
  %54 = getelementptr inbounds i8, ptr %50, i64 %53
  %55 = load i8, ptr %54, align 1, !tbaa !11
  %56 = sext i8 %55 to i32
  %57 = load ptr, ptr %6, align 8, !tbaa !5
  %58 = load i32, ptr %14, align 4, !tbaa !9
  %59 = sub nsw i32 %58, 1
  %60 = sext i32 %59 to i64
  %61 = getelementptr inbounds i8, ptr %57, i64 %60
  %62 = load i8, ptr %61, align 1, !tbaa !11
  %63 = sext i8 %62 to i32
  %64 = icmp eq i32 %56, %63
  br i1 %64, label %65, label %84

65:                                               ; preds = %49
  %66 = load i32, ptr %12, align 4, !tbaa !9
  %67 = sub nsw i32 %66, 1
  %68 = sext i32 %67 to i64
  %69 = mul nsw i64 %68, %20
  %70 = getelementptr inbounds i32, ptr %23, i64 %69
  %71 = load i32, ptr %14, align 4, !tbaa !9
  %72 = sub nsw i32 %71, 1
  %73 = sext i32 %72 to i64
  %74 = getelementptr inbounds i32, ptr %70, i64 %73
  %75 = load i32, ptr %74, align 4, !tbaa !9
  %76 = add nsw i32 %75, 1
  %77 = load i32, ptr %12, align 4, !tbaa !9
  %78 = sext i32 %77 to i64
  %79 = mul nsw i64 %78, %20
  %80 = getelementptr inbounds i32, ptr %23, i64 %79
  %81 = load i32, ptr %14, align 4, !tbaa !9
  %82 = sext i32 %81 to i64
  %83 = getelementptr inbounds i32, ptr %80, i64 %82
  store i32 %76, ptr %83, align 4, !tbaa !9
  br label %110

84:                                               ; preds = %49
  %85 = load i32, ptr %12, align 4, !tbaa !9
  %86 = sub nsw i32 %85, 1
  %87 = sext i32 %86 to i64
  %88 = mul nsw i64 %87, %20
  %89 = getelementptr inbounds i32, ptr %23, i64 %88
  %90 = load i32, ptr %14, align 4, !tbaa !9
  %91 = sext i32 %90 to i64
  %92 = getelementptr inbounds i32, ptr %89, i64 %91
  %93 = load i32, ptr %12, align 4, !tbaa !9
  %94 = sext i32 %93 to i64
  %95 = mul nsw i64 %94, %20
  %96 = getelementptr inbounds i32, ptr %23, i64 %95
  %97 = load i32, ptr %14, align 4, !tbaa !9
  %98 = sub nsw i32 %97, 1
  %99 = sext i32 %98 to i64
  %100 = getelementptr inbounds i32, ptr %96, i64 %99
  %101 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %92, ptr noundef nonnull align 4 dereferenceable(4) %100)
  %102 = load i32, ptr %101, align 4, !tbaa !9
  %103 = load i32, ptr %12, align 4, !tbaa !9
  %104 = sext i32 %103 to i64
  %105 = mul nsw i64 %104, %20
  %106 = getelementptr inbounds i32, ptr %23, i64 %105
  %107 = load i32, ptr %14, align 4, !tbaa !9
  %108 = sext i32 %107 to i64
  %109 = getelementptr inbounds i32, ptr %106, i64 %108
  store i32 %102, ptr %109, align 4, !tbaa !9
  br label %110

110:                                              ; preds = %84, %65
  br label %111

111:                                              ; preds = %110, %41
  br label %112

112:                                              ; preds = %111
  %113 = load i32, ptr %14, align 4, !tbaa !9
  %114 = add nsw i32 %113, 1
  store i32 %114, ptr %14, align 4, !tbaa !9
  br label %30, !llvm.loop !12

115:                                              ; preds = %34
  br label %116

116:                                              ; preds = %115
  %117 = load i32, ptr %12, align 4, !tbaa !9
  %118 = add nsw i32 %117, 1
  store i32 %118, ptr %12, align 4, !tbaa !9
  br label %24, !llvm.loop !14

119:                                              ; preds = %28
  %120 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, ptr noundef @.str)
  %121 = load i32, ptr %7, align 4, !tbaa !9
  %122 = sext i32 %121 to i64
  %123 = mul nsw i64 %122, %20
  %124 = getelementptr inbounds i32, ptr %23, i64 %123
  %125 = load i32, ptr %8, align 4, !tbaa !9
  %126 = sext i32 %125 to i64
  %127 = getelementptr inbounds i32, ptr %124, i64 %126
  %128 = load i32, ptr %127, align 4, !tbaa !9
  %129 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) %120, i32 noundef %128)
  %130 = load ptr, ptr %9, align 8
  call void @llvm.stackrestore.p0(ptr %130)
  ret void
}

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

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

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) #4

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #5

; 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 nosync nounwind willreturn memory(argmem: readwrite) }
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 = { inlinehint 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 #5 = { "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"

%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str = external hidden unnamed_addr constant [40 x i8], align 1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z7lcsAlgoPcS_ii(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = add nsw 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 = or i32 %2, %3
  %or.cond.not = icmp sgt i32 %11, -1
  br i1 %or.cond.not, label %.preheader.preheader, label %._crit_edge36

.preheader.preheader:                             ; preds = %4
  %12 = shl nuw nsw i64 %8, 2
  %exitcond.peel.not = icmp eq i32 %3, 0
  br label %.preheader

.preheader:                                       ; preds = %.preheader.preheader, %._crit_edge
  %.02935 = phi i32 [ %32, %._crit_edge ], [ 0, %.preheader.preheader ]
  %13 = zext i32 %.02935 to i64
  %14 = icmp eq i32 %.02935, 0
  %15 = add nsw i32 %.02935, -1
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds i8, ptr %0, i64 %16
  %18 = mul nsw i64 %16, %8
  %19 = getelementptr inbounds i32, ptr %10, i64 %18
  %20 = mul nuw nsw i64 %13, %8
  %21 = getelementptr inbounds i32, ptr %10, i64 %20
  br i1 %14, label %.lr.ph.split.us.preheader, label %22

22:                                               ; preds = %.preheader
  store i32 0, ptr %21, align 4, !tbaa !5
  br i1 %exitcond.peel.not, label %._crit_edge, label %.lr.ph.split.peel.next

.lr.ph.split.us.preheader:                        ; preds = %.preheader
  %23 = mul nuw nsw i64 %12, %13
  %scevgep = getelementptr i8, ptr %10, i64 %23
  call void @llvm.memset.p0.i64(ptr align 4 %scevgep, i8 0, i64 %12, i1 false), !tbaa !5
  br label %._crit_edge

._crit_edge36:                                    ; preds = %._crit_edge, %4
  %24 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, ptr noundef nonnull @.str)
  %25 = sext i32 %2 to i64
  %26 = mul nsw i64 %8, %25
  %27 = getelementptr inbounds i32, ptr %10, i64 %26
  %28 = sext i32 %3 to i64
  %29 = getelementptr inbounds i32, ptr %27, i64 %28
  %30 = load i32, ptr %29, align 4, !tbaa !5
  %31 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) %24, i32 noundef %30)
  ret void

._crit_edge:                                      ; preds = %47, %22, %.lr.ph.split.us.preheader
  %32 = add i32 %.02935, 1
  %.not = icmp sgt i32 %32, %2
  br i1 %.not, label %._crit_edge36, label %.preheader, !llvm.loop !9

.lr.ph.split.peel.next:                           ; preds = %22, %47
  %indvars.iv = phi i64 [ %indvars.iv.next, %47 ], [ 1, %22 ]
  %33 = load i8, ptr %17, align 1, !tbaa !11
  %34 = add nsw i64 %indvars.iv, -1
  %35 = getelementptr inbounds i8, ptr %1, i64 %34
  %36 = load i8, ptr %35, align 1, !tbaa !11
  %37 = icmp eq i8 %33, %36
  br i1 %37, label %38, label %42

38:                                               ; preds = %.lr.ph.split.peel.next
  %39 = getelementptr inbounds i32, ptr %19, i64 %34
  %40 = load i32, ptr %39, align 4, !tbaa !5
  %41 = add nsw i32 %40, 1
  br label %47

42:                                               ; preds = %.lr.ph.split.peel.next
  %43 = getelementptr inbounds i32, ptr %19, i64 %indvars.iv
  %44 = getelementptr inbounds i32, ptr %21, i64 %34
  %45 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %43, ptr noundef nonnull align 4 dereferenceable(4) %44)
  %46 = load i32, ptr %45, align 4, !tbaa !5
  br label %47

47:                                               ; preds = %42, %38
  %.sink = phi i32 [ %46, %42 ], [ %41, %38 ]
  %48 = getelementptr inbounds i32, ptr %21, i64 %indvars.iv
  store i32 %.sink, ptr %48, 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 %.lr.ph.split.peel.next, !llvm.loop !12
}

; 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 #1

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) local_unnamed_addr #2

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) local_unnamed_addr #3

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #4

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 = { 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 #2 = { inlinehint 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 #3 = { "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 = { nocallback nofree nounwind willreturn memory(argmem: write) }

!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, !13}
!13 = !{!"llvm.loop.peeled.count", i32 1}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopFullUnrollPass,LoopIdiomRecognizePass,LoopInstSimplifyPass,LoopRotatePass,LoopSimplifyCFGPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SCCPPass,SROAPass,SimplifyCFGPass