; LLVM IR from Muhammad-Magdi/problem-solving :: Dynamic Programming/Knapsack.ll (Z2KSii)

; 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 [1024 x i32], align 16
@C = external dso_local global [1024 x i32], align 16
@mem = external dso_local global [1024 x [1024 x i32]], align 16

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z2KSii(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 %4, align 4, !tbaa !5
  %11 = load i32, ptr @n, align 4, !tbaa !5
  %12 = icmp eq i32 %10, %11
  br i1 %12, label %13, label %14

13:                                               ; preds = %2
  store i32 0, ptr %3, align 4
  br label %61

14:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %15 = load i32, ptr %4, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [1024 x [1024 x i32]], ptr @mem, i64 0, i64 %16
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [1024 x i32], ptr %17, i64 0, i64 %19
  store ptr %20, ptr %6, align 8, !tbaa !9
  %21 = load ptr, ptr %6, align 8, !tbaa !9
  %22 = load i32, ptr %21, align 4, !tbaa !5
  %23 = xor i32 %22, -1
  %24 = icmp ne i32 %23, 0
  br i1 %24, label %25, label %28

25:                                               ; preds = %14
  %26 = load ptr, ptr %6, align 8, !tbaa !9
  %27 = load i32, ptr %26, align 4, !tbaa !5
  store i32 %27, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %60

28:                                               ; preds = %14
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  %29 = load i32, ptr %5, align 4, !tbaa !5
  %30 = load i32, ptr %4, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds [1024 x i32], ptr @W, i64 0, i64 %31
  %33 = load i32, ptr %32, align 4, !tbaa !5
  %34 = icmp sge i32 %29, %33
  br i1 %34, label %35, label %50

35:                                               ; preds = %28
  %36 = load i32, ptr %4, align 4, !tbaa !5
  %37 = add nsw i32 %36, 1
  %38 = load i32, ptr %5, align 4, !tbaa !5
  %39 = load i32, ptr %4, align 4, !tbaa !5
  %40 = sext i32 %39 to i64
  %41 = getelementptr inbounds [1024 x i32], ptr @W, i64 0, i64 %40
  %42 = load i32, ptr %41, align 4, !tbaa !5
  %43 = sub nsw i32 %38, %42
  %44 = call noundef i32 @_Z2KSii(i32 noundef %37, i32 noundef %43)
  %45 = load i32, ptr %4, align 4, !tbaa !5
  %46 = sext i32 %45 to i64
  %47 = getelementptr inbounds [1024 x i32], ptr @C, i64 0, i64 %46
  %48 = load i32, ptr %47, align 4, !tbaa !5
  %49 = add nsw i32 %44, %48
  br label %51

50:                                               ; preds = %28
  br label %51

51:                                               ; preds = %50, %35
  %52 = phi i32 [ %49, %35 ], [ -1061109567, %50 ]
  store i32 %52, ptr %8, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  %53 = load i32, ptr %4, align 4, !tbaa !5
  %54 = add nsw i32 %53, 1
  %55 = load i32, ptr %5, align 4, !tbaa !5
  %56 = call noundef i32 @_Z2KSii(i32 noundef %54, i32 noundef %55)
  store i32 %56, ptr %9, align 4, !tbaa !5
  %57 = 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)
  %58 = load i32, ptr %57, align 4, !tbaa !5
  %59 = load ptr, ptr %6, align 8, !tbaa !9
  store i32 %58, ptr %59, align 4, !tbaa !5
  store i32 %58, 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 %60

60:                                               ; preds = %51, %25
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  br label %61

61:                                               ; preds = %60, %13
  %62 = load i32, ptr %3, align 4
  ret i32 %62
}

; 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 [1024 x i32], align 16
@C = external dso_local local_unnamed_addr global [1024 x i32], align 16
@mem = external dso_local local_unnamed_addr global [1024 x [1024 x i32]], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z2KSii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = load i32, ptr @n, align 4, !tbaa !5
  %6 = icmp eq i32 %5, %0
  br i1 %6, label %common.ret18, label %7

7:                                                ; preds = %2
  %8 = sext i32 %0 to i64
  %9 = sext i32 %1 to i64
  %10 = getelementptr inbounds [1024 x [1024 x i32]], ptr @mem, i64 0, i64 %8, i64 %9
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %.not = icmp eq i32 %11, -1
  br i1 %.not, label %12, label %common.ret18

12:                                               ; preds = %7
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #3
  %13 = getelementptr inbounds [1024 x i32], ptr @W, i64 0, i64 %8
  %14 = load i32, ptr %13, align 4, !tbaa !5
  %.not17 = icmp sgt i32 %14, %1
  %.pre = add nsw i32 %0, 1
  br i1 %.not17, label %._crit_edge, label %15

15:                                               ; preds = %12
  %16 = sub nsw i32 %1, %14
  %17 = tail call noundef i32 @_Z2KSii(i32 noundef %.pre, i32 noundef %16)
  %18 = getelementptr inbounds [1024 x i32], ptr @C, i64 0, i64 %8
  %19 = load i32, ptr %18, align 4, !tbaa !5
  %20 = add nsw i32 %19, %17
  br label %._crit_edge

common.ret18:                                     ; preds = %7, %2, %._crit_edge
  %common.ret18.op = phi i32 [ %24, %._crit_edge ], [ 0, %2 ], [ %11, %7 ]
  ret i32 %common.ret18.op

._crit_edge:                                      ; preds = %12, %15
  %21 = phi i32 [ %20, %15 ], [ -1061109567, %12 ]
  store i32 %21, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #3
  %22 = tail call noundef i32 @_Z2KSii(i32 noundef %.pre, i32 noundef %1)
  store i32 %22, ptr %4, align 4, !tbaa !5
  %23 = 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)
  %24 = load i32, ptr %23, align 4, !tbaa !5
  store i32 %24, ptr %10, 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.ret18
}

; 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,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass