; LLVM IR from rahulyesantharao/b-epsilon-tree :: src/lru_cache/lru_cache.ll (ZN13LRULinkedList14RemoveRearNodeEv)

; 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.LRULinkedList = type { ptr, ptr }
%class.LRUNode = type { i32, i32, ptr, ptr }

; Function Attrs: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN13LRULinkedList14RemoveRearNodeEv(ptr noundef nonnull align 8 dereferenceable(16) %0) #2 align 2 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %4 = load ptr, ptr %2, align 8
  %5 = getelementptr inbounds %class.LRULinkedList, ptr %4, i32 0, i32 1
  %6 = load ptr, ptr %5, align 8, !tbaa !9
  %7 = getelementptr inbounds %class.LRUNode, ptr %6, i32 0, i32 2
  %8 = load ptr, ptr %7, align 8, !tbaa !11
  %9 = getelementptr inbounds %class.LRULinkedList, ptr %4, i32 0, i32 0
  %10 = load ptr, ptr %9, align 8, !tbaa !14
  %11 = icmp eq ptr %8, %10
  br i1 %11, label %12, label %13

12:                                               ; preds = %1
  br label %40

13:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %14 = getelementptr inbounds %class.LRULinkedList, ptr %4, i32 0, i32 1
  %15 = load ptr, ptr %14, align 8, !tbaa !9
  %16 = getelementptr inbounds %class.LRUNode, ptr %15, i32 0, i32 2
  %17 = load ptr, ptr %16, align 8, !tbaa !11
  store ptr %17, ptr %3, align 8, !tbaa !5
  %18 = getelementptr inbounds %class.LRULinkedList, ptr %4, i32 0, i32 1
  %19 = load ptr, ptr %18, align 8, !tbaa !9
  %20 = getelementptr inbounds %class.LRULinkedList, ptr %4, i32 0, i32 1
  %21 = load ptr, ptr %20, align 8, !tbaa !9
  %22 = getelementptr inbounds %class.LRUNode, ptr %21, i32 0, i32 2
  %23 = load ptr, ptr %22, align 8, !tbaa !11
  %24 = getelementptr inbounds %class.LRUNode, ptr %23, i32 0, i32 2
  %25 = load ptr, ptr %24, align 8, !tbaa !11
  %26 = getelementptr inbounds %class.LRUNode, ptr %25, i32 0, i32 3
  store ptr %19, ptr %26, align 8, !tbaa !15
  %27 = getelementptr inbounds %class.LRULinkedList, ptr %4, i32 0, i32 1
  %28 = load ptr, ptr %27, align 8, !tbaa !9
  %29 = getelementptr inbounds %class.LRUNode, ptr %28, i32 0, i32 2
  %30 = load ptr, ptr %29, align 8, !tbaa !11
  %31 = getelementptr inbounds %class.LRUNode, ptr %30, i32 0, i32 2
  %32 = load ptr, ptr %31, align 8, !tbaa !11
  %33 = getelementptr inbounds %class.LRULinkedList, ptr %4, i32 0, i32 1
  %34 = load ptr, ptr %33, align 8, !tbaa !9
  %35 = getelementptr inbounds %class.LRUNode, ptr %34, i32 0, i32 2
  store ptr %32, ptr %35, align 8, !tbaa !11
  %36 = load ptr, ptr %3, align 8, !tbaa !5
  %37 = icmp eq ptr %36, null
  br i1 %37, label %39, label %38

38:                                               ; preds = %13
  call void @_ZdlPvm(ptr noundef %36, i64 noundef 24) #4
  br label %39

39:                                               ; preds = %38, %13
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  br label %40

40:                                               ; preds = %39, %12
  ret void
}

attributes #0 = { 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 #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 }
attributes #4 = { 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 = !{!"_ZTS13LRULinkedList", !6, i64 0, !6, i64 8}
!11 = !{!12, !6, i64 8}
!12 = !{!"_ZTS7LRUNode", !13, i64 0, !13, i64 4, !6, i64 8, !6, i64 16}
!13 = !{!"int", !7, i64 0}
!14 = !{!10, !6, i64 0}
!15 = !{!12, !6, i64 16}


; 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: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN13LRULinkedList14RemoveRearNodeEv(ptr nocapture noundef nonnull readonly align 8 dereferenceable(16) %0) local_unnamed_addr #1 align 2 {
  %2 = getelementptr inbounds i8, ptr %0, i64 8
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %3, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !10
  %6 = load ptr, ptr %0, align 8, !tbaa !13
  %7 = icmp eq ptr %5, %6
  br i1 %7, label %12, label %8

8:                                                ; preds = %1
  %9 = getelementptr inbounds i8, ptr %5, i64 8
  %10 = load ptr, ptr %9, align 8, !tbaa !10
  %11 = getelementptr inbounds i8, ptr %10, i64 16
  store ptr %3, ptr %11, align 8, !tbaa !14
  store ptr %10, ptr %4, align 8, !tbaa !10
  tail call void @_ZdlPvm(ptr noundef %5, i64 noundef 24) #2
  br label %12

12:                                               ; preds = %8, %1
  ret void
}

attributes #0 = { 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 #1 = { 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 = { 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 = !{!"_ZTS13LRULinkedList", !7, i64 0, !7, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!11, !7, i64 8}
!11 = !{!"_ZTS7LRUNode", !12, i64 0, !12, i64 4, !7, i64 8, !7, i64 16}
!12 = !{!"int", !8, i64 0}
!13 = !{!6, !7, i64 0}
!14 = !{!11, !7, i64 16}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass