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* In sanitizer mode, add generations to swisstable iterators and backing ↵Gravatar Evan Brown2022-12-19
| | | | | | | arrays so that we can detect invalid iterator use. PiperOrigin-RevId: 496455788 Change-Id: I83df92828098a3ef1181b4e454f3ac5d3ac7a2f2
* Optimize raw_hash_set CountLeadingEmptyOrDeleted() on ArmGravatar Connal de Souza2022-12-19
| | | | | | | | name old cpu/op new cpu/op delta BM_Group_CountLeadingEmptyOrDeleted 0.98ns ± 0% 0.78ns ± 0% -20.51% (p=0.000 n=10+10) PiperOrigin-RevId: 496397005 Change-Id: I1c6b325b14566da194f21d3387b6f4d838bf0b34
* Fix some ClangTidy warnings in raw_hash_set code.Gravatar Evan Brown2022-12-08
| | | | | PiperOrigin-RevId: 493993005 Change-Id: I0705be8678022a9e08a1af9972687b7955593994
* Change CommonFields from a private base class of raw_hash_set to be the ↵Gravatar Evan Brown2022-12-08
| | | | | | | | | | | first member of the settings_ CompressedTuple so that we can move growth_left into CommonFields. This allows for removing growth_left as a separate argument for a few functions. Also, move the infoz() accessor functions to be before the data members of CommonFields to comply with the style guide. PiperOrigin-RevId: 493918310 Change-Id: I58474e37d3b16a1513d2931af6b153dea1d809c2
* Add a compilation test for recursive hash map typesGravatar Derek Mauro2022-12-02
| | | | | PiperOrigin-RevId: 492535520 Change-Id: I2e58b39bd4ab3064f675474c5e712c76fac02674
* Move the vtable into a function to delay instantiation until the function isGravatar Samuel Benzaquen2022-12-01
| | | | | | | | | | | | | called. When the variable is a global the compiler is allowed to instantiate it more aggresively and it might happen before the types involved are complete. When it is inside a function the compiler can't instantiate it until after the functions are called. Remove an unused member from the vtable. Replace transfer_slot_fn with a generic function when relocation is available to reduce duplication. PiperOrigin-RevId: 492227302 Change-Id: I07499f63b91c59c0ae42402683387c7b84a6f0ee
* Reduce flat_hash_{set,map} generated code size.Gravatar Abseil Team2022-11-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This CL makes a bunch of changes (mostly to raw_hash_set which underlies flat_hash_set and flat_hash_map). Techniques used: * Extract code that does not depend on the specific hash table type into common (non-inlined) functions. * Place ABSL_ATTRIBUTE_NOINLINE directives judiciously. * Out-of-line some slow paths. Reduces sizes of some large binaries by ~0.5%. Has no significant performance impact on a few performance critical binaries. ## Speed of fleetbench micro-benchmarks Following is a histogram of %-age changes in [fleetbench](https://github.com/google/fleetbench) hot_swissmap_benchmark results. Negative numbers indicate a speedup caused by this change. Statistically insignificant changes are mapped to zero. XXX Also run and merge in cold_swissmap_benchmark Across all 351 benchmarks, the average speedup is 0.38%. The best speedup was -25%, worst slowdown was +6.81%. ``` Count: 351 Average: -0.382764 StdDev: 3.77807 Min: -25 Median: 0.435135 Max: 6.81 --------------------------------------------- [ -25, -10) 16 4.558% 4.558% # [ -9, -8) 2 0.570% 5.128% [ -8, -7) 1 0.285% 5.413% [ -7, -6) 1 0.285% 5.698% [ -6, -5) 2 0.570% 6.268% [ -5, -4) 5 1.425% 7.692% [ -4, -3) 13 3.704% 11.396% # [ -3, -2) 15 4.274% 15.670% # [ -2, -1) 26 7.407% 23.077% ## [ -1, 0) 14 3.989% 27.066% # [ 0, 1) 185 52.707% 79.772% ############ [ 1, 2) 14 3.989% 83.761% # [ 2, 3) 8 2.279% 86.040% # [ 3, 4) 7 1.994% 88.034% [ 4, 5) 32 9.117% 97.151% ## [ 5, 6) 6 1.709% 98.860% [ 6, 7) 4 1.140% 100.000% ``` We looked at the slowdowns and they do not seem worth worrying about. E.g., the worst one was: ``` BM_FindHit_Hot<::absl::node_hash_set,64>/set_size:4096/density:0 2.61ns ± 1% 2.79ns ± 1% +6.81% (p=0.008 n=5+5) ``` ## Detailed changes * Out-of-line slow paths in hash table sampler methods. * Explicitly unregister from sampler instead of from destructor. * Introduced a non-templated CommonFields struct that holds some of the hash table fields (infoz, ctrl, slots, size, capacity). This struct can be passed to new non-templated helpers. The struct is a private base class of raw_hash_set. * Made non-inlined InitializeSlots<> that is only templated on allocator and size/alignment of the slot type so that we can share instantiations across types that have the same size/alignment. * Moved some infrequently called code paths into non-inlined type-erased. functions. Pass a suite of type-specific function pointers to these routines for when they need to operate on slots. * Marked some methods as non-inlined. * Avoid unnecessary reinitialization in destructor. * Introduce UpdateSpine type-erased helper that is called from clear() and rehash(). PiperOrigin-RevId: 491413386 Change-Id: Ia5495c5a6ec73622a785a0d260e406ddb9085a7c
* Refactor btree iterator generation code into a base class rather than using ↵Gravatar Evan Brown2022-11-22
| | | | | | | ifdefs inside btree_iterator. PiperOrigin-RevId: 490317784 Change-Id: I4ffe2a1ad2e39890790e278d82eec7223b67908c
* Improve error messages when comparing btree iterators when generations are ↵Gravatar Evan Brown2022-11-21
| | | | | | | | | | enabled. - Add assertions that the iterators haven't been invalidated. - Also refactor some generation-related code to define the functions inside ABSL_BTREE_ENABLE_GENERATIONS ifdef/else branches. PiperOrigin-RevId: 489988637 Change-Id: I34d32ed2e27cf89f7f8bb5d9c1f6770bb40b8794
* Add a new API for `extract_and_get_next()` in b-tree that returns both the ↵Gravatar Evan Brown2022-11-15
| | | | | | | | extracted node and an iterator to the next element in the container. Motivation: it can be useful, when calling `extract` to maintain an iterator next to the location of the extracted element. `std::set`, et al. allow for this because they have iterator stability. `absl::{flat,node}_hash_{set,map}` allow for this because they are guaranteed not to rehash when elements are removed so they also have iterator stability across calls to `extract()`. But b-tree doesn't support this use case without this API because removing elements can cause rebalancing, which invalidates iterators. We can get the next iterator without this API using `lower_bound(node_handle.value())`, but that requires an extra lookup. PiperOrigin-RevId: 488721247 Change-Id: Id66f17311bf53678f536e4e4f070775f5ce0c542
* Stop unnecessary clearing of fields in ~raw_hash_set.Gravatar Abseil Team2022-11-11
| | | | | | | | | | | Previously, ~raw_hash_set() would change *this to have the same representation as an empty hash table. This is unnecessary since nobody should be touching a destroyed hash table, and prevents future optimizations/changes that might not be able to preserve this behavior. PiperOrigin-RevId: 487899950 Change-Id: I2d4470677bdd411c2e48ef511187e39f4e7fc2f4
* Improve error messages when comparing btree iterators.Gravatar Evan Brown2022-11-10
| | | | | | | | - Add assertions that the iterators are either (a) from the same container or (b) both default constructed. Standard says: "The domain of == for forward iterators is that of iterators over the same underlying sequence. However, value-initialized iterators may be compared and shall compare equal to other value-initialized iterators of the same type." - [reference](https://eel.is/c++draft/forward.iterators#2). - Also optimize IsEndIterator a bit. PiperOrigin-RevId: 487617518 Change-Id: Iefba5c3bc8caa93954671793e6929e22f419c298
* Improve error messages when comparing swisstable iterators.Gravatar Evan Brown2022-11-09
| | | | | | | We check for comparisons of swisstable iterators from different heap allocations, which can indicate either iterators from different containers or that there was a rehash between when the iterators were initialized. PiperOrigin-RevId: 487304602 Change-Id: I5c596c5ea07948d66e048f99937f9032a630344f
* Auto increase inlined capacity whenever it does not affect class' size.Gravatar Abseil Team2022-11-09
| | | | | PiperOrigin-RevId: 487292771 Change-Id: I2454e28fe91017fb2954a4ad194712fcafe893d2
* Fix some invalid iterator bugs in btree_test.cc for multi{set,map} ↵Gravatar Evan Brown2022-11-07
| | | | | | | | | | | | | emplace{_hint} tests. Note that multi{set,map}::emplace doesn't specify in which order the new element is inserted if there are equivalent keys in the table, whereas emplace_hint specifies that the new element must be before the hint if possible. https://en.cppreference.com/w/cpp/container/multiset/emplace https://en.cppreference.com/w/cpp/container/multiset/emplace_hint Also refactor to rely on IsAssertEnabled instead of checking for NDEBUG. PiperOrigin-RevId: 486733450 Change-Id: Ie90d33c584a6caccd8301ad6fc0396234dbbfac4
* Merge pull request #1287 from GOGOYAO:patch-1Gravatar Copybara-Service2022-11-03
|\ | | | | | | | | PiperOrigin-RevId: 485886212 Change-Id: Ic7a710913f8376d07b9bdeb987d007ec04e48465
* | Improve error messages when dereferencing invalid swisstable iterators.Gravatar Evan Brown2022-11-01
| | | | | | | | | | | | | | | | | | - Separate the failure cases into different assertions: end/default constructed vs rehashed or erased. - Update the assertion error for AssertIsValid to not mention the end iterator case because end iterators are considered valid by AssertIsValid. - Also fix an out-of-date comment for skip_empty_or_deleted. PiperOrigin-RevId: 485402559 Change-Id: I593056abdc6c3565d0396fb885923fef643bf4e4
* | Add a warning about extract invalidating iterators (not just the iterator of ↵Gravatar Abseil Team2022-10-31
| | | | | | | | | | | | | | the element being extracted). PiperOrigin-RevId: 485120182 Change-Id: Ic54d538721678bed0a748dacbf33c319e62b93b8
* | `absl::InlinedVector::swap` supports non-assignable types.Gravatar Abseil Team2022-10-25
| | | | | | | | | | PiperOrigin-RevId: 483752526 Change-Id: Ie6b63a4a3cc7593e5b8bf255ba571a77d609ce04
* | Improve b-tree error messages when dereferencing invalid iterators.Gravatar Evan Brown2022-10-25
| | | | | | | | | | | | | | | | - Check for invalid generation before checking for other types of invalid iterators. - Check specifically for dereferencing end() iterators. PiperOrigin-RevId: 483725646 Change-Id: Ibca19c48b1b242384683580145be8fb9ae707bc8
* | Use btree iterator subtraction instead of std::distance in erase_range() and ↵Gravatar Evan Brown2022-10-18
| | | | | | | | | | | | | | count(). PiperOrigin-RevId: 481979737 Change-Id: I69f53665b0463a7d8d80f2a3feedfdd95d32b012
* | Implement btree_iterator::operator-, which is faster than std::distance for ↵Gravatar Evan Brown2022-10-17
| | | | | | | | | | | | | | | | btree iterators. Note: btree_iterator::operator- is still O(N) because in the worst case (end()-begin()), we will have at least one operation per node in the tree, and there are at least N/M nodes, where M (a constant) is the maximum number of values per node. PiperOrigin-RevId: 481716874 Change-Id: Ic0225b7509208ed96b75a2dc626d2aa4a24f4946
* | `absl::InlinedVector` supports move assignment with non-assignable types.Gravatar Abseil Team2022-10-12
| | | | | | | | | | PiperOrigin-RevId: 480601268 Change-Id: I5a639da57b79ae600387c81e662d5c1542b2bf99
* | Add static_cast<void*> to the sources for trivial relocations to avoid ↵Gravatar Evan Brown2022-10-07
| | | | | | | | | | | | | | spurious -Wdynamic-class-memaccess errors in the presence of other compilation errors. PiperOrigin-RevId: 479625866 Change-Id: Ia10ad35a2f58ffb3f36f996d357d5e126b181e1c
* | Eliminate use of internal interfacesGravatar Gennadiy Rozental2022-10-06
| | | | | | | | | | PiperOrigin-RevId: 479325483 Change-Id: I9c4384173ce996818e0cf749c0fc465d6e9aaf8c
* | No changes in OSS.Gravatar Gennadiy Rozental2022-10-04
| | | | | | | | | | PiperOrigin-RevId: 478869244 Change-Id: Id16eb1e5036e95a5e2a990a647f1f7090129a009
| * Initialize `Allocation` to eliminate compile errorGravatar GOGOYAO2022-10-04
|/ | | | | | Class `Allocation` is not initialized and I will get a compile error like this. ``` error: ‘worklist.absl::lts_20220623::InlinedVector<absl::lts_20220623::cord_internal::CordRep*, 2, std::allocator<absl::lts_20220623::cord_internal::CordRep*> >::storage_.absl::lts_20220623::inlined_vector_internal::Storage<absl::lts_20220623::cord_internal::CordRep*, 2, std::allocator<absl::lts_20220623::cord_internal::CordRep*> >::data_.absl::lts_20220623::inlined_vector_internal::Storage<absl::lts_20220623::cord_internal::CordRep*, 2, std::allocator<absl::lts_20220623::cord_internal::CordRep*> >::Data::allocated.absl::lts_20220623::inlined_vector_internal::Storage<absl::lts_20220623::cord_internal::CordRep*, 2, std::allocator<absl::lts_20220623::cord_internal::CordRep*> >::Allocated::allocated_capacity’ may be used uninitialized [-Werror=maybe-uninitialized] ```
* Use trivial relocation for transfers in swisstable and b-tree.Gravatar Evan Brown2022-10-03
| | | | | PiperOrigin-RevId: 478547898 Change-Id: Ie20cd0a49df042be912888ee238333a5f5fa0404
* Add common_policy_traits - a subset of hash_policy_traits that can be shared ↵Gravatar Evan Brown2022-09-28
| | | | | | | | | | between raw_hash_set and btree. Also remove the transfer implementations from btree_set.h and flat_hash_set.h, which are equivalent to the default implementations. Motivation: this will simplify upcoming changes related to trivial relocation. PiperOrigin-RevId: 477493403 Change-Id: I75babef4c93dec3a8105f86c58af54199bb1ec9c
* Fix -Wimplicit-int-conversion and -Wsign-conversion warnings in btree.Gravatar Abseil Team2022-09-26
| | | | | | | | | | | Certain core libraries in Chrome build with these warnings [1]; btree_map and btree_set cannot be used in those libraries until these warnings are fixed. [1] https://crbug.com/1292951 PiperOrigin-RevId: 476908396 Change-Id: I32e9ea1eec911e329d6ff00f04fa2e9cfde8660a
* Add sparse and string copy constructor benchmarks for hash table.Gravatar Abseil Team2022-09-20
| | | | | PiperOrigin-RevId: 475601161 Change-Id: I3f67a1597ddfa6de60f19fe4b38d44fbc5630bd8
* Make BTrees work with custom allocators that recycle memory.Gravatar Abseil Team2022-09-19
| | | | | | | | | | | | The btree data structure poisons regions of memory it's not using. It leaves these regions poisoned when it frees memory. This means that a custom memory allocator that tries to reuse freed memory will trigger an ASAN use-after-poison error. The fix is to unpoison each memory region right before freeing it. PiperOrigin-RevId: 475309671 Change-Id: I29d55c298d3d89a83e1f960deb6e93118891ff83
* Add more options for `BM_iteration` in order to see better picture for ↵Gravatar Abseil Team2022-09-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | choosing trade off for iteration optimizations. ``` BM_Iteration/1/1 1.83ns ± 0% BM_Iteration/2/2 2.63ns ±11% BM_Iteration/4/4 5.76ns ±26% BM_Iteration/7/7 3.79ns ± 0% BM_Iteration/10/10 8.49ns ±23% BM_Iteration/15/15 18.2ns ±30% BM_Iteration/16/16 21.2ns ±29% BM_Iteration/54/54 37.2ns ±21% BM_Iteration/100/100 74.7ns ±13% BM_Iteration/400/400 330ns ± 8% BM_Iteration/0/0 0.46ns ± 2% BM_Iteration/10/0 1.26ns ± 1% BM_Iteration/100/0 13.4ns ± 0% BM_Iteration/1000/0 417ns ± 0% BM_Iteration/10000/0 3.30µs ± 0% BM_Iteration/100/1 16.0ns ±12% BM_Iteration/1000/10 453ns ± 5% ``` PiperOrigin-RevId: 474282700 Change-Id: I4b3fcb80292147aa4a8f542ae5c7fc1e8bd5f05b
* Change `EndComparison` benchmark to not measure iteration. Also added ↵Gravatar Abseil Team2022-09-13
| | | | | | | | | | | | | | | | | | `BM_Iteration` separately. ``` BM_EndComparison 0.46ns ± 0% BM_Iteration/10/10 8.09ns ± 7% BM_Iteration/20/20 18.6ns ±16% BM_Iteration/100/100 79.0ns ±15% BM_Iteration/400/400 344ns ± 5% BM_Iteration/100/1 16.6ns ± 1% BM_Iteration/1000/10 454ns ± 3% ``` PiperOrigin-RevId: 474211728 Change-Id: I9bd799a4be3247ca8f2a2144b6e857db8c99c81f
* Apply clang-format to btree.h.Gravatar Evan Brown2022-09-13
| | | | | PiperOrigin-RevId: 474060540 Change-Id: Ie0f24dfa6ec724eaa9eca82de5f73bbd8d622e38
* Fix "unsafe narrowing" warnings in absl, 8/n.Gravatar Abseil Team2022-09-12
| | | | | | | | | | | | | | | Addresses failures with the following, in some files: -Wshorten-64-to-32 -Wimplicit-int-conversion -Wsign-compare -Wsign-conversion -Wtautological-unsigned-zero-compare (This specific CL focuses on .cc files in */internal/.) Bug: chromium:1292951 PiperOrigin-RevId: 473868797 Change-Id: Ibe0b76e33f9e001d59862beaac54fb47bacd39b2
* Fix "unsafe narrowing" warnings in absl, 10/n.Gravatar Abseil Team2022-09-08
| | | | | | | | | | | | | | | Addresses failures with the following, in some files: -Wshorten-64-to-32 -Wimplicit-int-conversion -Wsign-compare -Wsign-conversion -Wtautological-unsigned-zero-compare (This specific CL focuses on tests.) Bug: chromium:1292951 PiperOrigin-RevId: 473055916 Change-Id: I40cdd6c87ba9d0a5fb2db5746cff04f14ee829c2
* Fix "unsafe narrowing" warnings in absl, 9/n.Gravatar Abseil Team2022-09-08
| | | | | | | | | | | | | | | Addresses failures with the following, in some files: -Wshorten-64-to-32 -Wimplicit-int-conversion -Wsign-compare -Wsign-conversion -Wtautological-unsigned-zero-compare (This specific CL focuses on miscellaneous non-test source files.) Bug: chromium:1292951 PiperOrigin-RevId: 473054605 Change-Id: Ifd7b24966613ca915511a3a607095508068200b8
* Convert algorithm and container benchmarks to cc_binaryGravatar Derek Mauro2022-09-06
| | | | | PiperOrigin-RevId: 472521745 Change-Id: Ia76cd720d1036dce05f6332f41a2ff748b3ea971
* InlinedVector: Small improvement to the max_size() calculationGravatar Derek Mauro2022-09-02
| | | | | | | | | | In some cases we can do a bit better by using std::min(std::numeric_limits<size_type>::max() / 2, allocator<T>::max_size()) They may help in some cases, particularly on 32-bit platforms. PiperOrigin-RevId: 471846886 Change-Id: I5bd63de5dd8aec3de6530a33d8904dd6e9bd015e
* Fix ClangTidy warnings in btree.h and btree_test.cc.Gravatar Evan Brown2022-09-01
| | | | | PiperOrigin-RevId: 471639724 Change-Id: Ie609f4d5b15c06fc286fae2944b550937da266d3
* Workaround for ASAN stack safety analysis problem with FixedArray container ↵Gravatar Abseil Team2022-09-01
| | | | | | | | | | | | | | | | | | | | | | | | | annotations. The problem is that the underlying storage adds redzone after the actual data so from compiler's perspective it looks like a valid memory. In the outlined version the memory is returned in call.i.i with unknown size so the access check can't be removed. The workaround is to always outline the call to InitializeData for ASAN builds. Outlined version: %call.i.i = call noundef i32* @absl::FixedArray<int, 4ul, std::__u::allocator<int> >::Storage::InitializeData()(...), !dbg !28 store i32* %call.i.i, i32** %data_.i.i, align 8, !dbg !27 %arrayidx = getelementptr inbounds i32, i32* %call.i.i, i64 5, !dbg !29 %24 = bitcast i32* %arrayidx to i8*, !dbg !29 call void @llvm.asan.check.memaccess(i8* %24, i32 36), !dbg !29 store i32 0, i32* %arrayidx, align 4, !dbg !29 Inlined version: %arrayidx = getelementptr inbounds %"class.absl::FixedArray", %"class.absl::FixedArray"* %7, i64 0, i32 0, i32 0, i32 1, i64 20, !dbg !40 %27 = bitcast i8* %arrayidx to i32*, !dbg !40 >>>>>>>>>>>>>>> call to @llvm.asan.check.memaccess removed <<<<<<<<<<<<<< store i32 0, i32* %27, align 4, !dbg !40 Workaround for ASAN stack safety analysis problem with FixedArray container annotations. PiperOrigin-RevId: 471583635 Change-Id: I0d74eed5782a1cbd340ca4aca1bce71b63b06d43
* Rollback of fix "unsafe narrowing" warnings in absl, 8/n.Gravatar Derek Mauro2022-09-01
| | | | | | | | | | | | | | | Addresses failures with the following, in some files: -Wshorten-64-to-32 -Wimplicit-int-conversion -Wsign-compare -Wsign-conversion -Wtautological-unsigned-zero-compare (This specific CL focuses on .cc files in */internal/.) Bug: chromium:1292951 PiperOrigin-RevId: 471561809 Change-Id: I7abd6d83706f5ca135f1ce3458192a498a6280b9
* Fix "unsafe narrowing" warnings in absl, 8/n.Gravatar Abseil Team2022-09-01
| | | | | | | | | | | | | | | Addresses failures with the following, in some files: -Wshorten-64-to-32 -Wimplicit-int-conversion -Wsign-compare -Wsign-conversion -Wtautological-unsigned-zero-compare (This specific CL focuses on .cc files in */internal/.) Bug: chromium:1292951 PiperOrigin-RevId: 471549854 Change-Id: Id685d0e4666212926f4e001b8ef4930b6a33a4cc
* InlinedVector: Correct the computation of max_size()Gravatar Derek Mauro2022-08-31
| | | | | | | | Corrects the computation of max_size(), so that it accounts for the size of the objects. PiperOrigin-RevId: 471343778 Change-Id: I68e222cefaa0295b8d8c38d00308a29df4165e81
* Fixed header guards to match style guide conventions.Gravatar Abseil Team2022-08-31
| | | | | PiperOrigin-RevId: 471292183 Change-Id: Ic124d671dd3b0ae819f741885abb046cbf7e1add
* Added some more no_test.. tags to build targets for controlling testing.Gravatar Abseil Team2022-08-31
| | | | | PiperOrigin-RevId: 471256712 Change-Id: I2a1e4846a524bccd3c935a40abab0c0218afdfc0
* Fix "unsafe narrowing" warnings in absl, 1/n.Gravatar Abseil Team2022-07-28
| | | | | | | | | | | | | | | Addresses failures with the following, in some files: -Wshorten-64-to-32 -Wimplicit-int-conversion -Wsign-compare -Wsign-conversion -Wtautological-unsigned-zero-compare (This specific CL focuses on .h and win32 .inc files.) Bug: chromium:1292951 PiperOrigin-RevId: 463835431 Change-Id: If8e5f7f651d5cd96035e23e4623bdb08a7fedabe
* Fixed sign-conversion warning in code.Gravatar Abseil Team2022-07-25
| | | | | PiperOrigin-RevId: 463214218 Change-Id: I54a37fd9560b480f9eaf0454670eacf875015fe8
* Undo documentation change on erase.Gravatar Abseil Team2022-07-12
| | | | | PiperOrigin-RevId: 460555564 Change-Id: Icaf08bd252be12717f922e72a70a201bc1957154
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