; LLVM IR from zchrissirhcz/pixel :: legacy/contrib/xadd/bili_refcount2.ll (ZN8CStudent7releaseEv)

; 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"

%class.CStudent = type { ptr, ptr }

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN8CStudent7releaseEv(ptr noundef nonnull align 8 dereferenceable(16) %0) #0 align 2 {
  %2 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %3 = load ptr, ptr %2, align 8
  %4 = getelementptr inbounds %class.CStudent, ptr %3, i32 0, i32 1
  %5 = load ptr, ptr %4, align 8, !tbaa !9
  %6 = icmp ne ptr %5, null
  br i1 %6, label %7, label %42

7:                                                ; preds = %1
  %8 = getelementptr inbounds %class.CStudent, ptr %3, i32 0, i32 1
  %9 = load ptr, ptr %8, align 8, !tbaa !9
  %10 = load i32, ptr %9, align 4, !tbaa !11
  %11 = icmp sgt i32 %10, 0
  br i1 %11, label %12, label %42

12:                                               ; preds = %7
  %13 = getelementptr inbounds %class.CStudent, ptr %3, i32 0, i32 1
  %14 = load ptr, ptr %13, align 8, !tbaa !9
  %15 = load i32, ptr %14, align 4, !tbaa !11
  %16 = sub nsw i32 %15, 1
  %17 = getelementptr inbounds %class.CStudent, ptr %3, i32 0, i32 1
  %18 = load ptr, ptr %17, align 8, !tbaa !9
  store i32 %16, ptr %18, align 4, !tbaa !11
  %19 = getelementptr inbounds %class.CStudent, ptr %3, i32 0, i32 1
  %20 = load ptr, ptr %19, align 8, !tbaa !9
  %21 = load i32, ptr %20, align 4, !tbaa !11
  %22 = icmp eq i32 %21, 0
  br i1 %22, label %23, label %41

23:                                               ; preds = %12
  %24 = getelementptr inbounds %class.CStudent, ptr %3, i32 0, i32 0
  %25 = load ptr, ptr %24, align 8, !tbaa !13
  %26 = icmp ne ptr %25, null
  br i1 %26, label %27, label %33

27:                                               ; preds = %23
  %28 = getelementptr inbounds %class.CStudent, ptr %3, i32 0, i32 0
  %29 = load ptr, ptr %28, align 8, !tbaa !13
  %30 = icmp eq ptr %29, null
  br i1 %30, label %32, label %31

31:                                               ; preds = %27
  call void @_ZdaPv(ptr noundef %29) #2
  br label %32

32:                                               ; preds = %31, %27
  br label %33

33:                                               ; preds = %32, %23
  %34 = getelementptr inbounds %class.CStudent, ptr %3, i32 0, i32 0
  store ptr null, ptr %34, align 8, !tbaa !13
  %35 = getelementptr inbounds %class.CStudent, ptr %3, i32 0, i32 1
  %36 = load ptr, ptr %35, align 8, !tbaa !9
  %37 = icmp eq ptr %36, null
  br i1 %37, label %39, label %38

38:                                               ; preds = %33
  call void @_ZdlPvm(ptr noundef %36, i64 noundef 4) #2
  br label %39

39:                                               ; preds = %38, %33
  %40 = getelementptr inbounds %class.CStudent, ptr %3, i32 0, i32 1
  store ptr null, ptr %40, align 8, !tbaa !9
  br label %41

41:                                               ; preds = %39, %12
  br label %42

42:                                               ; preds = %41, %7, %1
  ret void
}

; Function Attrs: nobuiltin nounwind
declare void @_ZdaPv(ptr noundef) #1

; Function Attrs: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) #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 = { nobuiltin nounwind "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 = { builtin 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, !6, i64 8}
!10 = !{!"_ZTS8CStudent", !6, i64 0, !6, i64 8}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!10, !6, 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 void @_ZN8CStudent7releaseEv(ptr nocapture noundef nonnull align 8 dereferenceable(16) %0) local_unnamed_addr #0 align 2 {
  %2 = getelementptr inbounds i8, ptr %0, i64 8
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %.not = icmp eq ptr %3, null
  br i1 %.not, label %16, label %4

4:                                                ; preds = %1
  %5 = load i32, ptr %3, align 4, !tbaa !10
  %6 = icmp sgt i32 %5, 0
  br i1 %6, label %7, label %16

7:                                                ; preds = %4
  %8 = add nsw i32 %5, -1
  store i32 %8, ptr %3, align 4, !tbaa !10
  %9 = icmp eq i32 %8, 0
  br i1 %9, label %10, label %16

10:                                               ; preds = %7
  %11 = load ptr, ptr %0, align 8, !tbaa !12
  %.not4 = icmp eq ptr %11, null
  br i1 %.not4, label %.thread, label %12

12:                                               ; preds = %10
  tail call void @_ZdaPv(ptr noundef nonnull %11) #2
  %.pre = load ptr, ptr %2, align 8, !tbaa !5
  store ptr null, ptr %0, align 8, !tbaa !12
  %13 = icmp eq ptr %.pre, null
  br i1 %13, label %15, label %.thread

.thread:                                          ; preds = %10, %12
  %14 = phi ptr [ %.pre, %12 ], [ %3, %10 ]
  tail call void @_ZdlPvm(ptr noundef nonnull %14, i64 noundef 4) #2
  br label %15

15:                                               ; preds = %.thread, %12
  store ptr null, ptr %2, align 8, !tbaa !5
  br label %16

16:                                               ; preds = %7, %15, %4, %1
  ret void
}

; Function Attrs: nobuiltin nounwind
declare void @_ZdaPv(ptr noundef) local_unnamed_addr #1

; Function Attrs: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) local_unnamed_addr #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 = { nobuiltin nounwind "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 = { builtin 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, !7, i64 8}
!6 = !{!"_ZTS8CStudent", !7, i64 0, !7, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!11, !11, i64 0}
!11 = !{!"int", !8, i64 0}
!12 = !{!6, !7, i64 0}


; Effective O3 passes: CorrelatedValuePropagationPass,DSEPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InstCombinePass,JumpThreadingPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass