; LLVM IR from nsccgz-storage/nvlsm :: table/iterator.ll (ZN7leveldb16NewEmptyIteratorEv)

; 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.leveldb::Status" = type { ptr }

declare i32 @__gxx_personality_v0(...)

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

; Function Attrs: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) #1

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

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znwm(i64 noundef) #2

; Function Attrs: mustprogress uwtable
define dso_local noundef ptr @_ZN7leveldb16NewEmptyIteratorEv() #3 personality ptr @__gxx_personality_v0 {
  %1 = alloca %"class.leveldb::Status", align 8
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca i1, align 1
  %5 = call noalias noundef nonnull ptr @_Znwm(i64 noundef 48) #5
  store i1 true, ptr %4, align 1
  call void @llvm.lifetime.start.p0(i64 8, ptr %1) #6
  invoke void @_ZN7leveldb6Status2OKEv(ptr dead_on_unwind writable sret(%"class.leveldb::Status") align 8 %1)
          to label %6 unwind label %8

6:                                                ; preds = %0
  invoke void @_ZN7leveldb12_GLOBAL__N_113EmptyIteratorC2ERKNS_6StatusE(ptr noundef nonnull align 8 dereferenceable(48) %5, ptr noundef nonnull align 8 dereferenceable(8) %1)
          to label %7 unwind label %12

7:                                                ; preds = %6
  store i1 false, ptr %4, align 1
  call void @_ZN7leveldb6StatusD2Ev(ptr noundef nonnull align 8 dereferenceable(8) %1) #6
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #6
  ret ptr %5

8:                                                ; preds = %0
  %9 = landingpad { ptr, i32 }
          cleanup
  %10 = extractvalue { ptr, i32 } %9, 0
  store ptr %10, ptr %2, align 8
  %11 = extractvalue { ptr, i32 } %9, 1
  store i32 %11, ptr %3, align 4
  br label %16

12:                                               ; preds = %6
  %13 = landingpad { ptr, i32 }
          cleanup
  %14 = extractvalue { ptr, i32 } %13, 0
  store ptr %14, ptr %2, align 8
  %15 = extractvalue { ptr, i32 } %13, 1
  store i32 %15, ptr %3, align 4
  call void @_ZN7leveldb6StatusD2Ev(ptr noundef nonnull align 8 dereferenceable(8) %1) #6
  br label %16

16:                                               ; preds = %12, %8
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #6
  %17 = load i1, ptr %4, align 1
  br i1 %17, label %18, label %19

18:                                               ; preds = %16
  call void @_ZdlPvm(ptr noundef %5, i64 noundef 48) #7
  br label %19

19:                                               ; preds = %18, %16
  br label %20

20:                                               ; preds = %19
  %21 = load ptr, ptr %2, align 8
  %22 = load i32, ptr %3, align 4
  %23 = insertvalue { ptr, i32 } poison, ptr %21, 0
  %24 = insertvalue { ptr, i32 } %23, i32 %22, 1
  resume { ptr, i32 } %24
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN7leveldb6Status2OKEv(ptr dead_on_unwind noalias writable sret(%"class.leveldb::Status") align 8) #4 align 2

; Function Attrs: mustprogress uwtable
declare hidden void @_ZN7leveldb12_GLOBAL__N_113EmptyIteratorC2ERKNS_6StatusE(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #3 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN7leveldb6StatusD2Ev(ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #4 align 2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { nobuiltin allocsize(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 = { 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 #4 = { 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 #5 = { builtin allocsize(0) }
attributes #6 = { nounwind }
attributes #7 = { 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)"}


; 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"

%"class.leveldb::Status" = type { ptr }

declare i32 @__gxx_personality_v0(...)

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

; Function Attrs: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) local_unnamed_addr #1

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

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znwm(i64 noundef) local_unnamed_addr #2

; Function Attrs: mustprogress uwtable
define dso_local noundef nonnull ptr @_ZN7leveldb16NewEmptyIteratorEv() local_unnamed_addr #3 personality ptr @__gxx_personality_v0 {
  %1 = alloca %"class.leveldb::Status", align 8
  %2 = tail call noalias noundef nonnull dereferenceable(48) ptr @_Znwm(i64 noundef 48) #5
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %1) #6
  call void @_ZN7leveldb6Status2OKEv(ptr dead_on_unwind nonnull writable sret(%"class.leveldb::Status") align 8 %1)
  invoke void @_ZN7leveldb12_GLOBAL__N_113EmptyIteratorC2ERKNS_6StatusE(ptr noundef nonnull align 8 dereferenceable(48) %2, ptr noundef nonnull align 8 dereferenceable(8) %1)
          to label %3 unwind label %4

3:                                                ; preds = %0
  call void @_ZN7leveldb6StatusD2Ev(ptr noundef nonnull align 8 dereferenceable(8) %1) #6
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %1) #6
  ret ptr %2

4:                                                ; preds = %0
  %5 = landingpad { ptr, i32 }
          cleanup
  call void @_ZN7leveldb6StatusD2Ev(ptr noundef nonnull align 8 dereferenceable(8) %1) #6
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %1) #6
  call void @_ZdlPvm(ptr noundef nonnull %2, i64 noundef 48) #7
  resume { ptr, i32 } %5
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN7leveldb6Status2OKEv(ptr dead_on_unwind noalias writable sret(%"class.leveldb::Status") align 8) local_unnamed_addr #4 align 2

; Function Attrs: mustprogress uwtable
declare hidden void @_ZN7leveldb12_GLOBAL__N_113EmptyIteratorC2ERKNS_6StatusE(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #3 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN7leveldb6StatusD2Ev(ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #4 align 2

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { nobuiltin allocsize(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 = { 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 #4 = { 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 #5 = { builtin allocsize(0) }
attributes #6 = { nounwind }
attributes #7 = { 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)"}


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