; LLVM IR from ravireddy07/cpp-book :: src/Knapsack/0-1Knapsack_both_DP_Approaches.ll (Z8knapsackPiS_xx)

; 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 @_Z8knapsackPiS_xx(ptr noundef %0, ptr noundef %1, i64 noundef %2, i64 noundef %3) #0 {
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca i64, align 8
  %9 = alloca i64, align 8
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store ptr %0, ptr %6, align 8, !tbaa !5
  store ptr %1, ptr %7, align 8, !tbaa !5
  store i64 %2, ptr %8, align 8, !tbaa !9
  store i64 %3, ptr %9, align 8, !tbaa !9
  %12 = load i64, ptr %8, align 8, !tbaa !9
  %13 = icmp eq i64 %12, 0
  br i1 %13, label %17, label %14

14:                                               ; preds = %4
  %15 = load i64, ptr %9, align 8, !tbaa !9
  %16 = icmp eq i64 %15, 0
  br i1 %16, label %17, label %18

17:                                               ; preds = %14, %4
  store i32 0, ptr %5, align 4
  br label %57

18:                                               ; preds = %14
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  store i32 0, ptr %10, align 4, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #3
  store i32 0, ptr %11, align 4, !tbaa !11
  %19 = load ptr, ptr %6, align 8, !tbaa !5
  %20 = load i64, ptr %8, align 8, !tbaa !9
  %21 = sub nsw i64 %20, 1
  %22 = getelementptr inbounds i32, ptr %19, i64 %21
  %23 = load i32, ptr %22, align 4, !tbaa !11
  %24 = sext i32 %23 to i64
  %25 = load i64, ptr %9, align 8, !tbaa !9
  %26 = icmp sle i64 %24, %25
  br i1 %26, label %27, label %47

27:                                               ; preds = %18
  %28 = load ptr, ptr %7, align 8, !tbaa !5
  %29 = load i64, ptr %8, align 8, !tbaa !9
  %30 = sub nsw i64 %29, 1
  %31 = getelementptr inbounds i32, ptr %28, i64 %30
  %32 = load i32, ptr %31, align 4, !tbaa !11
  %33 = load ptr, ptr %6, align 8, !tbaa !5
  %34 = load ptr, ptr %7, align 8, !tbaa !5
  %35 = load i64, ptr %8, align 8, !tbaa !9
  %36 = sub nsw i64 %35, 1
  %37 = load i64, ptr %9, align 8, !tbaa !9
  %38 = load ptr, ptr %6, align 8, !tbaa !5
  %39 = load i64, ptr %8, align 8, !tbaa !9
  %40 = sub nsw i64 %39, 1
  %41 = getelementptr inbounds i32, ptr %38, i64 %40
  %42 = load i32, ptr %41, align 4, !tbaa !11
  %43 = sext i32 %42 to i64
  %44 = sub nsw i64 %37, %43
  %45 = call noundef i32 @_Z8knapsackPiS_xx(ptr noundef %33, ptr noundef %34, i64 noundef %36, i64 noundef %44)
  %46 = add nsw i32 %32, %45
  store i32 %46, ptr %10, align 4, !tbaa !11
  br label %47

47:                                               ; preds = %27, %18
  %48 = load ptr, ptr %6, align 8, !tbaa !5
  %49 = load ptr, ptr %7, align 8, !tbaa !5
  %50 = load i64, ptr %8, align 8, !tbaa !9
  %51 = sub nsw i64 %50, 1
  %52 = load i64, ptr %9, align 8, !tbaa !9
  %53 = call noundef i32 @_Z8knapsackPiS_xx(ptr noundef %48, ptr noundef %49, i64 noundef %51, i64 noundef %52)
  %54 = add nsw i32 0, %53
  store i32 %54, ptr %11, align 4, !tbaa !11
  %55 = 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)
  %56 = load i32, ptr %55, align 4, !tbaa !11
  store i32 %56, 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 %57

57:                                               ; preds = %47, %17
  %58 = load i32, ptr %5, align 4
  ret i32 %58
}

; 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !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 @_Z8knapsackPiS_xx(ptr noundef %0, ptr noundef %1, i64 noundef %2, i64 noundef %3) local_unnamed_addr #0 {
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = icmp eq i64 %2, 0
  %8 = icmp eq i64 %3, 0
  %or.cond = or i1 %7, %8
  br i1 %or.cond, label %common.ret21, label %9

9:                                                ; preds = %4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %5) #3
  store i32 0, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %6) #3
  %10 = add nsw i64 %2, -1
  %11 = getelementptr inbounds i32, ptr %0, i64 %10
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %.not = icmp sgt i64 %13, %3
  br i1 %.not, label %20, label %14

14:                                               ; preds = %9
  %15 = getelementptr inbounds i32, ptr %1, i64 %10
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = sub nsw i64 %3, %13
  %18 = tail call noundef i32 @_Z8knapsackPiS_xx(ptr noundef nonnull %0, ptr noundef %1, i64 noundef %10, i64 noundef %17)
  %19 = add nsw i32 %18, %16
  store i32 %19, ptr %5, align 4, !tbaa !5
  br label %20

common.ret21:                                     ; preds = %4, %20
  %common.ret21.op = phi i32 [ %23, %20 ], [ 0, %4 ]
  ret i32 %common.ret21.op

20:                                               ; preds = %14, %9
  %21 = tail call noundef i32 @_Z8knapsackPiS_xx(ptr noundef nonnull %0, ptr noundef %1, i64 noundef %10, i64 noundef %3)
  store i32 %21, ptr %6, align 4, !tbaa !5
  %22 = 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)
  %23 = load i32, ptr %22, 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.ret21
}

; 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,DSEPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass