diff options
Diffstat (limited to 'third_party/abseil-cpp/absl/container/internal/raw_hash_set.cc')
-rw-r--r-- | third_party/abseil-cpp/absl/container/internal/raw_hash_set.cc | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/third_party/abseil-cpp/absl/container/internal/raw_hash_set.cc b/third_party/abseil-cpp/absl/container/internal/raw_hash_set.cc index 919ac07405..687bcb8a4d 100644 --- a/third_party/abseil-cpp/absl/container/internal/raw_hash_set.cc +++ b/third_party/abseil-cpp/absl/container/internal/raw_hash_set.cc @@ -23,11 +23,17 @@ namespace absl { ABSL_NAMESPACE_BEGIN namespace container_internal { +alignas(16) ABSL_CONST_INIT ABSL_DLL const ctrl_t kEmptyGroup[16] = { + ctrl_t::kSentinel, ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty, + ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty, + ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty, + ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty}; + constexpr size_t Group::kWidth; // Returns "random" seed. inline size_t RandomSeed() { -#if ABSL_HAVE_THREAD_LOCAL +#ifdef ABSL_HAVE_THREAD_LOCAL static thread_local size_t counter = 0; size_t value = ++counter; #else // ABSL_HAVE_THREAD_LOCAL @@ -37,12 +43,25 @@ inline size_t RandomSeed() { return value ^ static_cast<size_t>(reinterpret_cast<uintptr_t>(&counter)); } -bool ShouldInsertBackwards(size_t hash, ctrl_t* ctrl) { +bool ShouldInsertBackwards(size_t hash, const ctrl_t* ctrl) { // To avoid problems with weak hashes and single bit tests, we use % 13. // TODO(kfm,sbenza): revisit after we do unconditional mixing return (H1(hash, ctrl) ^ RandomSeed()) % 13 > 6; } +void ConvertDeletedToEmptyAndFullToDeleted(ctrl_t* ctrl, size_t capacity) { + assert(ctrl[capacity] == ctrl_t::kSentinel); + assert(IsValidCapacity(capacity)); + for (ctrl_t* pos = ctrl; pos < ctrl + capacity; pos += Group::kWidth) { + Group{pos}.ConvertSpecialToEmptyAndFullToDeleted(pos); + } + // Copy the cloned ctrl bytes. + std::memcpy(ctrl + capacity + 1, ctrl, NumClonedBytes()); + ctrl[capacity] = ctrl_t::kSentinel; +} +// Extern template instantiotion for inline function. +template FindInfo find_first_non_full(const ctrl_t*, size_t, size_t); + } // namespace container_internal ABSL_NAMESPACE_END } // namespace absl |