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* Add CodegenAbslRawHashSetStringFindNeEnd function, which is useful because ↵Gravatar Evan Brown2023-01-20
| | | | | | | the find isn't inlined but the iterator comparison is. PiperOrigin-RevId: 503473637 Change-Id: I02b8d95b7a1b738314c4f07a863c7606f822f079
* In sanitizer mode, detect when references become invalidated after reserved ↵Gravatar Evan Brown2023-01-17
| | | | | | | growth runs out. PiperOrigin-RevId: 502625638 Change-Id: I1c06b2162dbdaaa6a36cea503ac6d07cd157b2e2
* In sanitizer mode, detect when invalidated iterators are compared.Gravatar Evan Brown2023-01-05
| | | | | PiperOrigin-RevId: 499964205 Change-Id: I45a1d62a5e093921946e7c3c7ab31480252b330e
* Fix a bug in iterator validation code in which we don't update the table's ↵Gravatar Evan Brown2022-12-22
| | | | | | | reserved growth if the reservation wouldn't grow the table. PiperOrigin-RevId: 497246219 Change-Id: I9671236f56d10851c49de71c21899368be6c3a00
* 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
* 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
* 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
* | `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
* | 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 ClangTidy warnings in btree.h and btree_test.cc.Gravatar Evan Brown2022-09-01
| | | | | PiperOrigin-RevId: 471639724 Change-Id: Ie609f4d5b15c06fc286fae2944b550937da266d3
* 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
* Fixed header guards to match style guide conventions.Gravatar Abseil Team2022-08-31
| | | | | PiperOrigin-RevId: 471292183 Change-Id: Ic124d671dd3b0ae819f741885abb046cbf7e1add
* 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
* Use ABSL_INTERNAL_HAS_SSE2 instead of __SSE2__Gravatar Abseil Team2022-06-22
| | | | | | | | | | | | | | This ensures that emmintrin.h is included with clang-cl. Otherwise, errors like this occur: .../absl/container/internal/raw_hash_set.h(536,8): error: unknown type name '__m128i' inline __m128i _mm_cmpgt_epi8_fixed(__m128i a, __m128i b) { This aligns the include ifdef guards and the guards that use the provided APIs. The includes are also reordered, so they appear after the config header which provides the internal macro values. PiperOrigin-RevId: 456530271 Change-Id: I86dfd0022fd06fe7aa132138ec4d1bd14a86ba84
* counting_allocator: suppress bogus -Wuse-after-free warning in GCC 12Gravatar Derek Mauro2022-06-14
| | | | | PiperOrigin-RevId: 454932630 Change-Id: Ifc716552bb0cd7babcaf416fe28462c15b4c7f23
* Fix several typos in comments.Gravatar Abseil Team2022-06-10
| | | | | PiperOrigin-RevId: 454185620 Change-Id: Ifdff33cec4bdd63f160a8d3c18f959ac2a3b6f25
* Fix C++17 constexpr storage deprecation warningsGravatar Derek Mauro2022-06-09
| | | | | | | | | | | | | | | | | | | This change introduces the symbol ABSL_INTERNAL_NEED_REDUNDANT_CONSTEXPR_DECL to guard redundant declarations of static constexpr data members that are needed prior to C++17. This change also introduces the symbol ABSL_INTERNAL_CPLUSPLUS_LANG, which is supposed to be set to the same value as __cplusplus, except it uses _MSVC_LANG on MSVC so that the value is correct on MSVC. Neither of these new symbols should be used outside of Abseil. Fixes #1191 PiperOrigin-RevId: 453923908 Change-Id: I1316c52c19fa0c168b93cced0c817e4cb7c9c862
* Optimize SwissMap iteration by another 5-10% for ARMGravatar Abseil Team2022-06-09
| | | | | | | | | | | | | | | | | | | https://pastebin.com/fDvgWgHe After having a chat with Dougall Johnson (https://twitter.com/dougallj/status/1534213050944802816), we realized that __clzll works with zero arguments per documentation: https://developer.arm.com/documentation/101028/0009/Data-processing-intrinsics ``` Returns the number of leading zero bits in x. When x is zero it returns the argument width, i.e. 32 or 64. ``` Codegen improves https://godbolt.org/z/ebadf717Y Thus we can use a little bit different construction not involving CLS but using more understandable CLZ and removing some operations. PiperOrigin-RevId: 453879080 Change-Id: Ie2d7f834f63364d7bd50dd6a682c107985f21942
* In b-tree, support unassignable value types.Gravatar Evan Brown2022-06-06
| | | | | | | Avoid using value move/swap and delete those functions from slot_policy types. There was only one use of params_type::move in `erase`. PiperOrigin-RevId: 453237739 Change-Id: Ie81c6dba6c4db34e97a067d2c0defcded8044a5a
* Optimize SwissMap for ARM by 3-8% for all operationsGravatar Abseil Team2022-06-06
| | | | | | | | | | | https://pastebin.com/CmnzwUFN The key idea is to avoid using 16 byte NEON and use 8 byte NEON which has lower latency for BitMask::Match. Even though 16 byte NEON achieves higher throughput, in SwissMap it's very important to catch these Matches with low latency as probing on average happens at most once. I also introduced NonIterableMask as ARM has really great cbnz instructions and additional AND on scalar mask had 1 extra latency cycle PiperOrigin-RevId: 453216147 Change-Id: I842c50d323954f8383ae156491232ced55aacb78
* InlinedVector: Limit the scope of the maybe-uninitialized warning suppressionGravatar Derek Mauro2022-06-06
| | | | | | | Due to changes in GCC 12, without this change, the warning fires PiperOrigin-RevId: 453197246 Change-Id: I2e31cbff1707ab09868cf77dcf040b033984e654
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