; LLVM IR from Leet-Us-Code/DSA-A-Z-Practice :: Sid's Levels/Level - 1/Recursion/01KnapSack.ll (Z8knapSackiiPiS_)

; 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 @_Z8knapSackiiPiS_(i32 noundef %0, i32 noundef %1, ptr noundef %2, ptr noundef %3) #0 {
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca ptr, align 8
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store i32 %0, ptr %6, align 4, !tbaa !5
  store i32 %1, ptr %7, align 4, !tbaa !5
  store ptr %2, ptr %8, align 8, !tbaa !9
  store ptr %3, ptr %9, align 8, !tbaa !9
  %12 = load i32, ptr %6, align 4, !tbaa !5
  %13 = icmp eq i32 %12, 0
  br i1 %13, label %17, label %14

14:                                               ; preds = %4
  %15 = load i32, ptr %7, align 4, !tbaa !5
  %16 = icmp eq i32 %15, 0
  br i1 %16, label %17, label %18

17:                                               ; preds = %14, %4
  store i32 0, ptr %5, align 4
  br label %64

18:                                               ; preds = %14
  %19 = load ptr, ptr %8, align 8, !tbaa !9
  %20 = load i32, ptr %6, align 4, !tbaa !5
  %21 = sub nsw i32 %20, 1
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds i32, ptr %19, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !5
  %25 = load i32, ptr %7, align 4, !tbaa !5
  %26 = icmp sgt i32 %24, %25
  br i1 %26, label %27, label %34

27:                                               ; preds = %18
  %28 = load i32, ptr %6, align 4, !tbaa !5
  %29 = sub nsw i32 %28, 1
  %30 = load i32, ptr %7, align 4, !tbaa !5
  %31 = load ptr, ptr %8, align 8, !tbaa !9
  %32 = load ptr, ptr %9, align 8, !tbaa !9
  %33 = call noundef i32 @_Z8knapSackiiPiS_(i32 noundef %29, i32 noundef %30, ptr noundef %31, ptr noundef %32)
  br label %63

34:                                               ; preds = %18
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #3
  %35 = load i32, ptr %6, align 4, !tbaa !5
  %36 = sub nsw i32 %35, 1
  %37 = load i32, ptr %7, align 4, !tbaa !5
  %38 = load ptr, ptr %8, align 8, !tbaa !9
  %39 = load ptr, ptr %9, align 8, !tbaa !9
  %40 = call noundef i32 @_Z8knapSackiiPiS_(i32 noundef %36, i32 noundef %37, ptr noundef %38, ptr noundef %39)
  store i32 %40, ptr %10, align 4, !tbaa !5
  %41 = load ptr, ptr %9, align 8, !tbaa !9
  %42 = load i32, ptr %6, align 4, !tbaa !5
  %43 = sub nsw i32 %42, 1
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds i32, ptr %41, i64 %44
  %46 = load i32, ptr %45, align 4, !tbaa !5
  %47 = load i32, ptr %6, align 4, !tbaa !5
  %48 = sub nsw i32 %47, 1
  %49 = load i32, ptr %7, align 4, !tbaa !5
  %50 = load ptr, ptr %8, align 8, !tbaa !9
  %51 = load i32, ptr %6, align 4, !tbaa !5
  %52 = sub nsw i32 %51, 1
  %53 = sext i32 %52 to i64
  %54 = getelementptr inbounds i32, ptr %50, i64 %53
  %55 = load i32, ptr %54, align 4, !tbaa !5
  %56 = sub nsw i32 %49, %55
  %57 = load ptr, ptr %8, align 8, !tbaa !9
  %58 = load ptr, ptr %9, align 8, !tbaa !9
  %59 = call noundef i32 @_Z8knapSackiiPiS_(i32 noundef %48, i32 noundef %56, ptr noundef %57, ptr noundef %58)
  %60 = add nsw i32 %46, %59
  store i32 %60, ptr %11, align 4, !tbaa !5
  %61 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %10, ptr noundef nonnull align 4 dereferenceable(4) %11)
  %62 = load i32, ptr %61, align 4, !tbaa !5
  store i32 %62, ptr %5, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  br label %64

63:                                               ; preds = %27
  unreachable

64:                                               ; preds = %34, %17
  %65 = load i32, ptr %5, align 4
  ret i32 %65
}

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

; 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)) #2

; 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 = { 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 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !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"

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z8knapSackiiPiS_(i32 noundef %0, i32 noundef %1, ptr noundef %2, ptr noundef %3) local_unnamed_addr #0 {
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = icmp eq i32 %0, 0
  %8 = icmp eq i32 %1, 0
  %or.cond = or i1 %7, %8
  br i1 %or.cond, label %common.ret24, label %9

9:                                                ; preds = %4
  %10 = add nsw i32 %0, -1
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds i32, ptr %2, i64 %11
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %14 = icmp sgt i32 %13, %1
  br i1 %14, label %15, label %17

15:                                               ; preds = %9
  %16 = tail call noundef i32 @_Z8knapSackiiPiS_(i32 noundef %10, i32 noundef %1, ptr noundef nonnull %2, ptr noundef %3)
  unreachable

common.ret24:                                     ; preds = %4, %17
  %common.ret24.op = phi i32 [ %26, %17 ], [ 0, %4 ]
  ret i32 %common.ret24.op

17:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %5) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %6) #3
  %18 = tail call noundef i32 @_Z8knapSackiiPiS_(i32 noundef %10, i32 noundef %1, ptr noundef nonnull %2, ptr noundef %3)
  store i32 %18, ptr %5, align 4, !tbaa !5
  %19 = getelementptr inbounds i32, ptr %3, i64 %11
  %20 = load i32, ptr %19, align 4, !tbaa !5
  %21 = load i32, ptr %12, align 4, !tbaa !5
  %22 = sub nsw i32 %1, %21
  %23 = tail call noundef i32 @_Z8knapSackiiPiS_(i32 noundef %10, i32 noundef %22, ptr noundef nonnull %2, ptr noundef %3)
  %24 = add nsw i32 %23, %20
  store i32 %24, ptr %6, align 4, !tbaa !5
  %25 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %5, ptr noundef nonnull align 4 dereferenceable(4) %6)
  %26 = load i32, ptr %25, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %5) #3
  br label %common.ret24
}

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

; 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

; 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"}


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