; LLVM IR from brpapa/algorithms :: solutions/spoj/KNAPSACK.ll (Z2dpii)

; 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"

@N = external dso_local global i32, align 4
@w = external dso_local global [2020 x i32], align 16
@v = external dso_local global [2020 x i32], align 16
@memo = external dso_local global [2020 x [2020 x i32]], align 16

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z2dpii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  %10 = load i32, ptr %5, align 4, !tbaa !5
  %11 = icmp slt i32 %10, 0
  br i1 %11, label %12, label %13

12:                                               ; preds = %2
  store i32 -1073741824, ptr %3, align 4
  br label %54

13:                                               ; preds = %2
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = load i32, ptr @N, align 4, !tbaa !5
  %16 = icmp eq i32 %14, %15
  br i1 %16, label %17, label %18

17:                                               ; preds = %13
  store i32 0, ptr %3, align 4
  br label %54

18:                                               ; preds = %13
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %19 = load i32, ptr %4, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [2020 x [2020 x i32]], ptr @memo, i64 0, i64 %20
  %22 = load i32, ptr %5, align 4, !tbaa !5
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds [2020 x i32], ptr %21, i64 0, i64 %23
  store ptr %24, ptr %6, align 8, !tbaa !9
  %25 = load ptr, ptr %6, align 8, !tbaa !9
  %26 = load i32, ptr %25, align 4, !tbaa !5
  %27 = icmp ne i32 %26, -1
  br i1 %27, label %28, label %31

28:                                               ; preds = %18
  %29 = load ptr, ptr %6, align 8, !tbaa !9
  %30 = load i32, ptr %29, align 4, !tbaa !5
  store i32 %30, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %53

31:                                               ; preds = %18
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  %32 = load i32, ptr %4, align 4, !tbaa !5
  %33 = add nsw i32 %32, 1
  %34 = load i32, ptr %5, align 4, !tbaa !5
  %35 = call noundef i32 @_Z2dpii(i32 noundef %33, i32 noundef %34)
  store i32 %35, ptr %8, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  %36 = load i32, ptr %4, align 4, !tbaa !5
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds [2020 x i32], ptr @v, i64 0, i64 %37
  %39 = load i32, ptr %38, align 4, !tbaa !5
  %40 = load i32, ptr %4, align 4, !tbaa !5
  %41 = add nsw i32 %40, 1
  %42 = load i32, ptr %5, align 4, !tbaa !5
  %43 = load i32, ptr %4, align 4, !tbaa !5
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds [2020 x i32], ptr @w, i64 0, i64 %44
  %46 = load i32, ptr %45, align 4, !tbaa !5
  %47 = sub nsw i32 %42, %46
  %48 = call noundef i32 @_Z2dpii(i32 noundef %41, i32 noundef %47)
  %49 = add nsw i32 %39, %48
  store i32 %49, ptr %9, align 4, !tbaa !5
  %50 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %8, ptr noundef nonnull align 4 dereferenceable(4) %9)
  %51 = load i32, ptr %50, align 4, !tbaa !5
  %52 = load ptr, ptr %6, align 8, !tbaa !9
  store i32 %51, ptr %52, align 4, !tbaa !5
  store i32 %51, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  store i32 1, ptr %7, align 4
  br label %53

53:                                               ; preds = %31, %28
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  br label %54

54:                                               ; preds = %53, %17, %12
  %55 = load i32, ptr %3, align 4
  ret i32 %55
}

; 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"

@N = external dso_local local_unnamed_addr global i32, align 4
@w = external dso_local local_unnamed_addr global [2020 x i32], align 16
@v = external dso_local local_unnamed_addr global [2020 x i32], align 16
@memo = external dso_local local_unnamed_addr global [2020 x [2020 x i32]], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z2dpii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = icmp slt i32 %1, 0
  br i1 %5, label %common.ret16, label %6

6:                                                ; preds = %2
  %7 = load i32, ptr @N, align 4, !tbaa !5
  %8 = icmp eq i32 %7, %0
  br i1 %8, label %common.ret16, label %9

9:                                                ; preds = %6
  %10 = sext i32 %0 to i64
  %11 = zext nneg i32 %1 to i64
  %12 = getelementptr inbounds [2020 x [2020 x i32]], ptr @memo, i64 0, i64 %10, i64 %11
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %.not = icmp eq i32 %13, -1
  br i1 %.not, label %14, label %common.ret16

common.ret16:                                     ; preds = %9, %6, %2, %14
  %common.ret16.op = phi i32 [ %25, %14 ], [ -1073741824, %2 ], [ 0, %6 ], [ %13, %9 ]
  ret i32 %common.ret16.op

14:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #3
  %15 = add nsw i32 %0, 1
  %16 = tail call noundef i32 @_Z2dpii(i32 noundef %15, i32 noundef %1)
  store i32 %16, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #3
  %17 = getelementptr inbounds [2020 x i32], ptr @v, i64 0, i64 %10
  %18 = load i32, ptr %17, align 4, !tbaa !5
  %19 = getelementptr inbounds [2020 x i32], ptr @w, i64 0, i64 %10
  %20 = load i32, ptr %19, align 4, !tbaa !5
  %21 = sub nsw i32 %1, %20
  %22 = tail call noundef i32 @_Z2dpii(i32 noundef %15, i32 noundef %21)
  %23 = add nsw i32 %22, %18
  store i32 %23, ptr %4, align 4, !tbaa !5
  %24 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %3, ptr noundef nonnull align 4 dereferenceable(4) %4)
  %25 = load i32, ptr %24, align 4, !tbaa !5
  store i32 %25, ptr %12, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #3
  br label %common.ret16
}

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