; LLVM IR from facebook/redex :: libredex/RedexContext.ll (ZN12RedexContext23ConcurrentStringStorage9ContainerD2Ev)

; 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"

%"struct.RedexContext::ConcurrentStringStorage::Container" = type { i64, ptr }
%"struct.RedexContext::ConcurrentStringStorage::Container::Buffer" = type { i64, i64, %"class.std::unique_ptr", ptr }
%"class.std::unique_ptr" = type { %"struct.std::__uniq_ptr_data" }
%"struct.std::__uniq_ptr_data" = type { %"class.std::__uniq_ptr_impl" }
%"class.std::__uniq_ptr_impl" = type { %"class.std::tuple" }
%"class.std::tuple" = type { %"struct.std::_Tuple_impl" }
%"struct.std::_Tuple_impl" = type { %"struct.std::_Head_base.171" }
%"struct.std::_Head_base.171" = type { ptr }

; 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: mustprogress nounwind uwtable
define dso_local void @_ZN12RedexContext23ConcurrentStringStorage9ContainerD2Ev(ptr noundef nonnull align 8 dereferenceable(16) %0) unnamed_addr #1 align 2 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %5 = load ptr, ptr %2, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #4
  %6 = getelementptr inbounds %"struct.RedexContext::ConcurrentStringStorage::Container", ptr %5, i32 0, i32 1
  %7 = load ptr, ptr %6, align 8, !tbaa !9
  store ptr %7, ptr %3, align 8, !tbaa !5
  br label %8

8:                                                ; preds = %19, %1
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = icmp ne ptr %9, null
  br i1 %10, label %12, label %11

11:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #4
  br label %21

12:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #4
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = getelementptr inbounds %"struct.RedexContext::ConcurrentStringStorage::Container::Buffer", ptr %13, i32 0, i32 3
  %15 = load ptr, ptr %14, align 8, !tbaa !12
  store ptr %15, ptr %4, align 8, !tbaa !5
  %16 = load ptr, ptr %3, align 8, !tbaa !5
  %17 = icmp eq ptr %16, null
  br i1 %17, label %19, label %18

18:                                               ; preds = %12
  call void @_ZN12RedexContext23ConcurrentStringStorage9Container6BufferD2Ev(ptr noundef nonnull align 8 dereferenceable(32) %16) #4
  call void @_ZdlPvm(ptr noundef %16, i64 noundef 32) #5
  br label %19

19:                                               ; preds = %18, %12
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %20, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #4
  br label %8, !llvm.loop !20

21:                                               ; preds = %11
  ret void
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZN12RedexContext23ConcurrentStringStorage9Container6BufferD2Ev(ptr noundef nonnull align 8 dereferenceable(32)) unnamed_addr #2 align 2

; Function Attrs: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) #3

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { 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 #3 = { 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 #4 = { nounwind }
attributes #5 = { 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 = !{!"_ZTSN12RedexContext23ConcurrentStringStorage9ContainerE", !11, i64 0, !6, i64 8}
!11 = !{!"long", !7, i64 0}
!12 = !{!13, !6, i64 24}
!13 = !{!"_ZTSN12RedexContext23ConcurrentStringStorage9Container6BufferE", !11, i64 0, !11, i64 8, !14, i64 16, !6, i64 24}
!14 = !{!"_ZTSSt10unique_ptrIA_cSt14default_deleteIS0_EE", !15, i64 0}
!15 = !{!"_ZTSSt15__uniq_ptr_dataIcSt14default_deleteIA_cELb1ELb1EE", !16, i64 0}
!16 = !{!"_ZTSSt15__uniq_ptr_implIcSt14default_deleteIA_cEE", !17, i64 0}
!17 = !{!"_ZTSSt5tupleIJPcSt14default_deleteIA_cEEE", !18, i64 0}
!18 = !{!"_ZTSSt11_Tuple_implILm0EJPcSt14default_deleteIA_cEEE", !19, i64 0}
!19 = !{!"_ZTSSt10_Head_baseILm0EPcLb0EE", !6, i64 0}
!20 = distinct !{!20, !21}
!21 = !{!"llvm.loop.mustprogress"}


; 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 @_ZN12RedexContext23ConcurrentStringStorage9ContainerD2Ev(ptr nocapture noundef nonnull readonly align 8 dereferenceable(16) %0) unnamed_addr #0 align 2 {
  %2 = getelementptr inbounds i8, ptr %0, i64 8
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %.not5 = icmp eq ptr %3, null
  br i1 %.not5, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %1
  ret void

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.06 = phi ptr [ %5, %.lr.ph ], [ %3, %1 ]
  %4 = getelementptr inbounds i8, ptr %.06, i64 24
  %5 = load ptr, ptr %4, align 8, !tbaa !11
  tail call void @_ZN12RedexContext23ConcurrentStringStorage9Container6BufferD2Ev(ptr noundef nonnull align 8 dereferenceable(32) %.06) #3
  tail call void @_ZdlPvm(ptr noundef nonnull %.06, i64 noundef 32) #4
  %.not = icmp eq ptr %5, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !19
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZN12RedexContext23ConcurrentStringStorage9Container6BufferD2Ev(ptr noundef nonnull align 8 dereferenceable(32)) unnamed_addr #1 align 2

; Function Attrs: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) local_unnamed_addr #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 = { 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 #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, !10, i64 8}
!6 = !{!"_ZTSN12RedexContext23ConcurrentStringStorage9ContainerE", !7, i64 0, !10, i64 8}
!7 = !{!"long", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!12, !10, i64 24}
!12 = !{!"_ZTSN12RedexContext23ConcurrentStringStorage9Container6BufferE", !7, i64 0, !7, i64 8, !13, i64 16, !10, i64 24}
!13 = !{!"_ZTSSt10unique_ptrIA_cSt14default_deleteIS0_EE", !14, i64 0}
!14 = !{!"_ZTSSt15__uniq_ptr_dataIcSt14default_deleteIA_cELb1ELb1EE", !15, i64 0}
!15 = !{!"_ZTSSt15__uniq_ptr_implIcSt14default_deleteIA_cEE", !16, i64 0}
!16 = !{!"_ZTSSt5tupleIJPcSt14default_deleteIA_cEEE", !17, i64 0}
!17 = !{!"_ZTSSt11_Tuple_implILm0EJPcSt14default_deleteIA_cEEE", !18, i64 0}
!18 = !{!"_ZTSSt10_Head_baseILm0EPcLb0EE", !10, i64 0}
!19 = distinct !{!19, !20}
!20 = !{!"llvm.loop.mustprogress"}


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