; LLVM IR from MinaFaried3/Assiut-University-Training---Newcomers :: j-sheet7_recursion/U-Knapsack.ll (Z8knapSackiPiS_i)

; 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 @_Z8knapSackiPiS_i(i32 noundef %0, ptr noundef %1, ptr noundef %2, i32 noundef %3) #0 {
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store i32 %0, ptr %6, align 4, !tbaa !5
  store ptr %1, ptr %7, align 8, !tbaa !9
  store ptr %2, ptr %8, align 8, !tbaa !9
  store i32 %3, ptr %9, align 4, !tbaa !5
  %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 %9, 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 %63

18:                                               ; preds = %14
  %19 = load ptr, ptr %7, align 8, !tbaa !9
  %20 = load i32, ptr %9, 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 %6, 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 = load ptr, ptr %7, align 8, !tbaa !9
  %30 = load ptr, ptr %8, align 8, !tbaa !9
  %31 = load i32, ptr %9, align 4, !tbaa !5
  %32 = sub nsw i32 %31, 1
  %33 = call noundef i32 @_Z8knapSackiPiS_i(i32 noundef %28, ptr noundef %29, ptr noundef %30, i32 noundef %32)
  store i32 %33, ptr %5, align 4
  br label %63

34:                                               ; preds = %18
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  %35 = load ptr, ptr %8, align 8, !tbaa !9
  %36 = load i32, ptr %9, align 4, !tbaa !5
  %37 = sub nsw i32 %36, 1
  %38 = sext i32 %37 to i64
  %39 = getelementptr inbounds i32, ptr %35, i64 %38
  %40 = load i32, ptr %39, align 4, !tbaa !5
  %41 = load i32, ptr %6, align 4, !tbaa !5
  %42 = load ptr, ptr %7, align 8, !tbaa !9
  %43 = load i32, ptr %9, align 4, !tbaa !5
  %44 = sub nsw i32 %43, 1
  %45 = sext i32 %44 to i64
  %46 = getelementptr inbounds i32, ptr %42, i64 %45
  %47 = load i32, ptr %46, align 4, !tbaa !5
  %48 = sub nsw i32 %41, %47
  %49 = load ptr, ptr %7, align 8, !tbaa !9
  %50 = load ptr, ptr %8, align 8, !tbaa !9
  %51 = load i32, ptr %9, align 4, !tbaa !5
  %52 = sub nsw i32 %51, 1
  %53 = call noundef i32 @_Z8knapSackiPiS_i(i32 noundef %48, ptr noundef %49, ptr noundef %50, i32 noundef %52)
  %54 = add nsw i32 %40, %53
  store i32 %54, ptr %10, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #3
  %55 = load i32, ptr %6, align 4, !tbaa !5
  %56 = load ptr, ptr %7, align 8, !tbaa !9
  %57 = load ptr, ptr %8, align 8, !tbaa !9
  %58 = load i32, ptr %9, align 4, !tbaa !5
  %59 = sub nsw i32 %58, 1
  %60 = call noundef i32 @_Z8knapSackiPiS_i(i32 noundef %55, ptr noundef %56, ptr noundef %57, i32 noundef %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 %63

63:                                               ; preds = %34, %27, %17
  %64 = load i32, ptr %5, align 4
  ret i32 %64
}

; 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)) #1

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

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

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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 @_Z8knapSackiPiS_i(i32 noundef %0, ptr noundef %1, ptr noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = icmp eq i32 %0, 0
  br i1 %7, label %common.ret32, label %tailrecurse.preheader

tailrecurse.preheader:                            ; preds = %4
  %8 = sext i32 %3 to i64
  br label %tailrecurse

tailrecurse:                                      ; preds = %tailrecurse.preheader, %10
  %indvars.iv = phi i64 [ %8, %tailrecurse.preheader ], [ %indvars.iv.next, %10 ]
  %9 = icmp eq i64 %indvars.iv, 0
  br i1 %9, label %common.ret32, label %10

10:                                               ; preds = %tailrecurse
  %indvars.iv.next = add nsw i64 %indvars.iv, -1
  %11 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.next
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %13 = icmp sgt i32 %12, %0
  br i1 %13, label %tailrecurse, label %14

common.ret32:                                     ; preds = %4, %tailrecurse, %14
  %common.ret32.op = phi i32 [ %23, %14 ], [ 0, %tailrecurse ], [ 0, %4 ]
  ret i32 %common.ret32.op

14:                                               ; preds = %10
  %15 = trunc nsw i64 %indvars.iv.next to i32
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %5) #3
  %16 = getelementptr inbounds i32, ptr %2, i64 %indvars.iv.next
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = sub nsw i32 %0, %12
  %19 = tail call noundef i32 @_Z8knapSackiPiS_i(i32 noundef %18, ptr noundef nonnull %1, ptr noundef %2, i32 noundef %15)
  %20 = add nsw i32 %19, %17
  store i32 %20, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %6) #3
  %21 = tail call noundef i32 @_Z8knapSackiPiS_i(i32 noundef %0, ptr noundef nonnull %1, ptr noundef %2, i32 noundef %15)
  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.ret32
}

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

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

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 = { 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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopInstSimplifyPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass