; LLVM IR from artagnon/phoenixfs :: btree (delete)

; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
declare dso_local ptr @find_leaf(ptr noundef, i16 noundef zeroext, i1 noundef zeroext) #1

; Function Attrs: nounwind uwtable
declare dso_local ptr @find(ptr noundef, i16 noundef zeroext, i1 noundef zeroext) #1

; Function Attrs: nounwind
declare void @free(ptr noundef) #2

; Function Attrs: nounwind uwtable
declare dso_local ptr @delete_entry(ptr noundef, ptr noundef, i16 noundef zeroext, ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local ptr @delete(ptr noundef %0, i16 noundef zeroext %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i16, align 2
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i16 %1, ptr %4, align 2, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %7 = load ptr, ptr %3, align 8, !tbaa !5
  %8 = load i16, ptr %4, align 2, !tbaa !9
  %9 = call ptr @find(ptr noundef %7, i16 noundef zeroext %8, i1 noundef zeroext false)
  store ptr %9, ptr %6, align 8, !tbaa !5
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  %11 = load i16, ptr %4, align 2, !tbaa !9
  %12 = call ptr @find_leaf(ptr noundef %10, i16 noundef zeroext %11, i1 noundef zeroext false)
  store ptr %12, ptr %5, align 8, !tbaa !5
  %13 = load ptr, ptr %6, align 8, !tbaa !5
  %14 = icmp ne ptr %13, null
  br i1 %14, label %15, label %25

15:                                               ; preds = %2
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = icmp ne ptr %16, null
  br i1 %17, label %18, label %25

18:                                               ; preds = %15
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  %20 = load ptr, ptr %5, align 8, !tbaa !5
  %21 = load i16, ptr %4, align 2, !tbaa !9
  %22 = load ptr, ptr %6, align 8, !tbaa !5
  %23 = call ptr @delete_entry(ptr noundef %19, ptr noundef %20, i16 noundef zeroext %21, ptr noundef %22)
  store ptr %23, ptr %3, align 8, !tbaa !5
  %24 = load ptr, ptr %6, align 8, !tbaa !5
  call void @free(ptr noundef %24) #3
  br label %25

25:                                               ; preds = %18, %15, %2
  %26 = load ptr, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  ret ptr %26
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = { 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 #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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"short", !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: nounwind uwtable
declare dso_local ptr @find_leaf(ptr noundef, i16 noundef zeroext, i1 noundef zeroext) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local ptr @find(ptr noundef, i16 noundef zeroext, i1 noundef zeroext) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
declare dso_local ptr @delete_entry(ptr noundef, ptr noundef, i16 noundef zeroext, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local ptr @delete(ptr noundef %0, i16 noundef zeroext %1) local_unnamed_addr #0 {
  %3 = tail call ptr @find(ptr noundef %0, i16 noundef zeroext %1, i1 noundef zeroext false)
  %4 = tail call ptr @find_leaf(ptr noundef %0, i16 noundef zeroext %1, i1 noundef zeroext false)
  %5 = icmp ne ptr %3, null
  %6 = icmp ne ptr %4, null
  %or.cond = select i1 %5, i1 %6, i1 false
  br i1 %or.cond, label %7, label %9

7:                                                ; preds = %2
  %8 = tail call ptr @delete_entry(ptr noundef %0, ptr noundef nonnull %4, i16 noundef zeroext %1, ptr noundef nonnull %3)
  tail call void @free(ptr noundef nonnull %3) #2
  br label %9

9:                                                ; preds = %7, %2
  %.0 = phi ptr [ %8, %7 ], [ %0, %2 ]
  ret ptr %.0
}

attributes #0 = { 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 nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { 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)"}


; Effective O3 passes: CorrelatedValuePropagationPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,SROAPass,SimplifyCFGPass,TailCallElimPass