efd035164b
Summary: Especially after updating to C++17, I don't see a compelling case for *requiring* any folly components in RocksDB. I was able to purge the existing hard dependencies, and it can be quite difficult to strip out non-trivial components from folly for use in RocksDB. (The prospect of doing that on F14 has changed my mind on the best approach here.) But this change creates an optional integration where we can plug in components from folly at compile time, starting here with F14FastMap to replace std::unordered_map when possible (probably no public APIs for example). I have replaced the biggest CPU users of std::unordered_map with compile-time pluggable UnorderedMap which will use F14FastMap when USE_FOLLY is set. USE_FOLLY is always set in the Meta-internal buck build, and a simulation of that is in the Makefile for public CI testing. A full folly build is not needed, but checking out the full folly repo is much simpler for getting the dependency, and anything else we might want to optionally integrate in the future. Some picky details: * I don't think the distributed mutex stuff is actually used, so it was easy to remove. * I implemented an alternative to `folly::constexpr_log2` (which is much easier in C++17 than C++11) so that I could pull out the hard dependencies on `ConstexprMath.h` * I had to add noexcept move constructors/operators to some types to make F14's complainUnlessNothrowMoveAndDestroy check happy, and I added a macro to make that easier in some common cases. * Updated Meta-internal buck build to use folly F14Map (always) No updates to HISTORY.md nor INSTALL.md as this is not (yet?) considered a production integration for open source users. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9546 Test Plan: CircleCI tests updated so that a couple of them use folly. Most internal unit & stress/crash tests updated to use Meta-internal latest folly. (Note: they should probably use buck but they currently use Makefile.) Example performance improvement: when filter partitions are pinned in cache, they are tracked by PartitionedFilterBlockReader::filter_map_ and we can build a test that exercises that heavily. Build DB with ``` TEST_TMPDIR=/dev/shm/rocksdb ./db_bench -benchmarks=fillrandom -num=10000000 -disable_wal=1 -write_buffer_size=30000000 -bloom_bits=16 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=0 -partition_index_and_filters ``` and test with (simultaneous runs with & without folly, ~20 times each to see convergence) ``` TEST_TMPDIR=/dev/shm/rocksdb ./db_bench_folly -readonly -use_existing_db -benchmarks=readrandom -num=10000000 -bloom_bits=16 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=0 -partition_index_and_filters -duration=40 -pin_l0_filter_and_index_blocks_in_cache ``` Average ops/s no folly: 26229.2 Average ops/s with folly: 26853.3 (+2.4%) Reviewed By: ajkr Differential Revision: D34181736 Pulled By: pdillinger fbshipit-source-id: ffa6ad5104c2880321d8a1aa7187e00ab0d02e94
786 lines
31 KiB
C++
786 lines
31 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2012 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "util/hash.h"
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#include <cstring>
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#include <type_traits>
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#include <vector>
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#include "test_util/testharness.h"
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#include "util/coding.h"
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#include "util/coding_lean.h"
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#include "util/hash128.h"
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#include "util/math.h"
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#include "util/math128.h"
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using ROCKSDB_NAMESPACE::BijectiveHash2x64;
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using ROCKSDB_NAMESPACE::BijectiveUnhash2x64;
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using ROCKSDB_NAMESPACE::DecodeFixed64;
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using ROCKSDB_NAMESPACE::EncodeFixed32;
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using ROCKSDB_NAMESPACE::EndianSwapValue;
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using ROCKSDB_NAMESPACE::GetSliceHash64;
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using ROCKSDB_NAMESPACE::Hash;
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using ROCKSDB_NAMESPACE::Hash128;
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using ROCKSDB_NAMESPACE::Hash2x64;
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using ROCKSDB_NAMESPACE::Hash64;
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using ROCKSDB_NAMESPACE::Lower32of64;
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using ROCKSDB_NAMESPACE::Lower64of128;
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using ROCKSDB_NAMESPACE::ReverseBits;
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using ROCKSDB_NAMESPACE::Slice;
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using ROCKSDB_NAMESPACE::Unsigned128;
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using ROCKSDB_NAMESPACE::Upper32of64;
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using ROCKSDB_NAMESPACE::Upper64of128;
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// The hash algorithm is part of the file format, for example for the Bloom
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// filters. Test that the hash values are stable for a set of random strings of
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// varying lengths.
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TEST(HashTest, Values) {
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constexpr uint32_t kSeed = 0xbc9f1d34; // Same as BloomHash.
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EXPECT_EQ(Hash("", 0, kSeed), 3164544308u);
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EXPECT_EQ(Hash("\x08", 1, kSeed), 422599524u);
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EXPECT_EQ(Hash("\x17", 1, kSeed), 3168152998u);
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EXPECT_EQ(Hash("\x9a", 1, kSeed), 3195034349u);
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EXPECT_EQ(Hash("\x1c", 1, kSeed), 2651681383u);
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EXPECT_EQ(Hash("\x4d\x76", 2, kSeed), 2447836956u);
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EXPECT_EQ(Hash("\x52\xd5", 2, kSeed), 3854228105u);
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EXPECT_EQ(Hash("\x91\xf7", 2, kSeed), 31066776u);
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EXPECT_EQ(Hash("\xd6\x27", 2, kSeed), 1806091603u);
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EXPECT_EQ(Hash("\x30\x46\x0b", 3, kSeed), 3808221797u);
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EXPECT_EQ(Hash("\x56\xdc\xd6", 3, kSeed), 2157698265u);
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EXPECT_EQ(Hash("\xd4\x52\x33", 3, kSeed), 1721992661u);
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EXPECT_EQ(Hash("\x6a\xb5\xf4", 3, kSeed), 2469105222u);
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EXPECT_EQ(Hash("\x67\x53\x81\x1c", 4, kSeed), 118283265u);
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EXPECT_EQ(Hash("\x69\xb8\xc0\x88", 4, kSeed), 3416318611u);
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EXPECT_EQ(Hash("\x1e\x84\xaf\x2d", 4, kSeed), 3315003572u);
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EXPECT_EQ(Hash("\x46\xdc\x54\xbe", 4, kSeed), 447346355u);
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EXPECT_EQ(Hash("\xd0\x7a\x6e\xea\x56", 5, kSeed), 4255445370u);
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EXPECT_EQ(Hash("\x86\x83\xd5\xa4\xd8", 5, kSeed), 2390603402u);
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EXPECT_EQ(Hash("\xb7\x46\xbb\x77\xce", 5, kSeed), 2048907743u);
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EXPECT_EQ(Hash("\x6c\xa8\xbc\xe5\x99", 5, kSeed), 2177978500u);
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EXPECT_EQ(Hash("\x5c\x5e\xe1\xa0\x73\x81", 6, kSeed), 1036846008u);
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EXPECT_EQ(Hash("\x08\x5d\x73\x1c\xe5\x2e", 6, kSeed), 229980482u);
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EXPECT_EQ(Hash("\x42\xfb\xf2\x52\xb4\x10", 6, kSeed), 3655585422u);
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EXPECT_EQ(Hash("\x73\xe1\xff\x56\x9c\xce", 6, kSeed), 3502708029u);
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EXPECT_EQ(Hash("\x5c\xbe\x97\x75\x54\x9a\x52", 7, kSeed), 815120748u);
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EXPECT_EQ(Hash("\x16\x82\x39\x49\x88\x2b\x36", 7, kSeed), 3056033698u);
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EXPECT_EQ(Hash("\x59\x77\xf0\xa7\x24\xf4\x78", 7, kSeed), 587205227u);
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EXPECT_EQ(Hash("\xd3\xa5\x7c\x0e\xc0\x02\x07", 7, kSeed), 2030937252u);
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EXPECT_EQ(Hash("\x31\x1b\x98\x75\x96\x22\xd3\x9a", 8, kSeed), 469635402u);
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EXPECT_EQ(Hash("\x38\xd6\xf7\x28\x20\xb4\x8a\xe9", 8, kSeed), 3530274698u);
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EXPECT_EQ(Hash("\xbb\x18\x5d\xf4\x12\x03\xf7\x99", 8, kSeed), 1974545809u);
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EXPECT_EQ(Hash("\x80\xd4\x3b\x3b\xae\x22\xa2\x78", 8, kSeed), 3563570120u);
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EXPECT_EQ(Hash("\x1a\xb5\xd0\xfe\xab\xc3\x61\xb2\x99", 9, kSeed),
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2706087434u);
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EXPECT_EQ(Hash("\x8e\x4a\xc3\x18\x20\x2f\x06\xe6\x3c", 9, kSeed),
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1534654151u);
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EXPECT_EQ(Hash("\xb6\xc0\xdd\x05\x3f\xc4\x86\x4c\xef", 9, kSeed),
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2355554696u);
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EXPECT_EQ(Hash("\x9a\x5f\x78\x0d\xaf\x50\xe1\x1f\x55", 9, kSeed),
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1400800912u);
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EXPECT_EQ(Hash("\x22\x6f\x39\x1f\xf8\xdd\x4f\x52\x17\x94", 10, kSeed),
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3420325137u);
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EXPECT_EQ(Hash("\x32\x89\x2a\x75\x48\x3a\x4a\x02\x69\xdd", 10, kSeed),
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3427803584u);
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EXPECT_EQ(Hash("\x06\x92\x5c\xf4\x88\x0e\x7e\x68\x38\x3e", 10, kSeed),
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1152407945u);
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EXPECT_EQ(Hash("\xbd\x2c\x63\x38\xbf\xe9\x78\xb7\xbf\x15", 10, kSeed),
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3382479516u);
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}
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// The hash algorithm is part of the file format, for example for the Bloom
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// filters.
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TEST(HashTest, Hash64Misc) {
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constexpr uint32_t kSeed = 0; // Same as GetSliceHash64
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for (char fill : {'\0', 'a', '1', '\xff'}) {
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const size_t max_size = 1000;
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const std::string str(max_size, fill);
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for (size_t size = 0; size <= max_size; ++size) {
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uint64_t here = Hash64(str.data(), size, kSeed);
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// Must be same as unseeded Hash64 and GetSliceHash64
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EXPECT_EQ(here, Hash64(str.data(), size));
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EXPECT_EQ(here, GetSliceHash64(Slice(str.data(), size)));
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// Upper and Lower must reconstruct hash
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EXPECT_EQ(here, (uint64_t{Upper32of64(here)} << 32) | Lower32of64(here));
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EXPECT_EQ(here, (uint64_t{Upper32of64(here)} << 32) + Lower32of64(here));
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EXPECT_EQ(here, (uint64_t{Upper32of64(here)} << 32) ^ Lower32of64(here));
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// Seed changes hash value (with high probability)
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for (uint64_t var_seed = 1; var_seed != 0; var_seed <<= 1) {
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EXPECT_NE(here, Hash64(str.data(), size, var_seed));
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}
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// Size changes hash value (with high probability)
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size_t max_smaller_by = std::min(size_t{30}, size);
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for (size_t smaller_by = 1; smaller_by <= max_smaller_by; ++smaller_by) {
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EXPECT_NE(here, Hash64(str.data(), size - smaller_by, kSeed));
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}
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}
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}
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}
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// Test that hash values are "non-trivial" for "trivial" inputs
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TEST(HashTest, Hash64Trivial) {
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// Thorough test too slow for regression testing
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constexpr bool thorough = false;
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// For various seeds, make sure hash of empty string is not zero.
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constexpr uint64_t max_seed = thorough ? 0x1000000 : 0x10000;
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for (uint64_t seed = 0; seed < max_seed; ++seed) {
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uint64_t here = Hash64("", 0, seed);
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EXPECT_NE(Lower32of64(here), 0u);
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EXPECT_NE(Upper32of64(here), 0u);
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}
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// For standard seed, make sure hash of small strings are not zero
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constexpr uint32_t kSeed = 0; // Same as GetSliceHash64
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char input[4];
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constexpr int max_len = thorough ? 3 : 2;
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for (int len = 1; len <= max_len; ++len) {
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for (uint32_t i = 0; (i >> (len * 8)) == 0; ++i) {
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EncodeFixed32(input, i);
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uint64_t here = Hash64(input, len, kSeed);
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EXPECT_NE(Lower32of64(here), 0u);
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EXPECT_NE(Upper32of64(here), 0u);
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}
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}
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}
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// Test that the hash values are stable for a set of random strings of
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// varying small lengths.
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TEST(HashTest, Hash64SmallValueSchema) {
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constexpr uint32_t kSeed = 0; // Same as GetSliceHash64
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EXPECT_EQ(Hash64("", 0, kSeed), uint64_t{5999572062939766020u});
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EXPECT_EQ(Hash64("\x08", 1, kSeed), uint64_t{583283813901344696u});
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EXPECT_EQ(Hash64("\x17", 1, kSeed), uint64_t{16175549975585474943u});
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EXPECT_EQ(Hash64("\x9a", 1, kSeed), uint64_t{16322991629225003903u});
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EXPECT_EQ(Hash64("\x1c", 1, kSeed), uint64_t{13269285487706833447u});
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EXPECT_EQ(Hash64("\x4d\x76", 2, kSeed), uint64_t{6859542833406258115u});
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EXPECT_EQ(Hash64("\x52\xd5", 2, kSeed), uint64_t{4919611532550636959u});
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EXPECT_EQ(Hash64("\x91\xf7", 2, kSeed), uint64_t{14199427467559720719u});
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EXPECT_EQ(Hash64("\xd6\x27", 2, kSeed), uint64_t{12292689282614532691u});
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EXPECT_EQ(Hash64("\x30\x46\x0b", 3, kSeed), uint64_t{11404699285340020889u});
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EXPECT_EQ(Hash64("\x56\xdc\xd6", 3, kSeed), uint64_t{12404347133785524237u});
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EXPECT_EQ(Hash64("\xd4\x52\x33", 3, kSeed), uint64_t{15853805298481534034u});
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EXPECT_EQ(Hash64("\x6a\xb5\xf4", 3, kSeed), uint64_t{16863488758399383382u});
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EXPECT_EQ(Hash64("\x67\x53\x81\x1c", 4, kSeed),
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uint64_t{9010661983527562386u});
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EXPECT_EQ(Hash64("\x69\xb8\xc0\x88", 4, kSeed),
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uint64_t{6611781377647041447u});
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EXPECT_EQ(Hash64("\x1e\x84\xaf\x2d", 4, kSeed),
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uint64_t{15290969111616346501u});
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EXPECT_EQ(Hash64("\x46\xdc\x54\xbe", 4, kSeed),
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uint64_t{7063754590279313623u});
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EXPECT_EQ(Hash64("\xd0\x7a\x6e\xea\x56", 5, kSeed),
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uint64_t{6384167718754869899u});
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EXPECT_EQ(Hash64("\x86\x83\xd5\xa4\xd8", 5, kSeed),
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uint64_t{16874407254108011067u});
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EXPECT_EQ(Hash64("\xb7\x46\xbb\x77\xce", 5, kSeed),
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uint64_t{16809880630149135206u});
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EXPECT_EQ(Hash64("\x6c\xa8\xbc\xe5\x99", 5, kSeed),
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uint64_t{1249038833153141148u});
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EXPECT_EQ(Hash64("\x5c\x5e\xe1\xa0\x73\x81", 6, kSeed),
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uint64_t{17358142495308219330u});
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EXPECT_EQ(Hash64("\x08\x5d\x73\x1c\xe5\x2e", 6, kSeed),
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uint64_t{4237646583134806322u});
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EXPECT_EQ(Hash64("\x42\xfb\xf2\x52\xb4\x10", 6, kSeed),
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uint64_t{4373664924115234051u});
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EXPECT_EQ(Hash64("\x73\xe1\xff\x56\x9c\xce", 6, kSeed),
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uint64_t{12012981210634596029u});
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EXPECT_EQ(Hash64("\x5c\xbe\x97\x75\x54\x9a\x52", 7, kSeed),
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uint64_t{5716522398211028826u});
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EXPECT_EQ(Hash64("\x16\x82\x39\x49\x88\x2b\x36", 7, kSeed),
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uint64_t{15604531309862565013u});
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EXPECT_EQ(Hash64("\x59\x77\xf0\xa7\x24\xf4\x78", 7, kSeed),
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uint64_t{8601330687345614172u});
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EXPECT_EQ(Hash64("\xd3\xa5\x7c\x0e\xc0\x02\x07", 7, kSeed),
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uint64_t{8088079329364056942u});
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EXPECT_EQ(Hash64("\x31\x1b\x98\x75\x96\x22\xd3\x9a", 8, kSeed),
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uint64_t{9844314944338447628u});
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EXPECT_EQ(Hash64("\x38\xd6\xf7\x28\x20\xb4\x8a\xe9", 8, kSeed),
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uint64_t{10973293517982163143u});
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EXPECT_EQ(Hash64("\xbb\x18\x5d\xf4\x12\x03\xf7\x99", 8, kSeed),
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uint64_t{9986007080564743219u});
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EXPECT_EQ(Hash64("\x80\xd4\x3b\x3b\xae\x22\xa2\x78", 8, kSeed),
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uint64_t{1729303145008254458u});
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EXPECT_EQ(Hash64("\x1a\xb5\xd0\xfe\xab\xc3\x61\xb2\x99", 9, kSeed),
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uint64_t{13253403748084181481u});
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EXPECT_EQ(Hash64("\x8e\x4a\xc3\x18\x20\x2f\x06\xe6\x3c", 9, kSeed),
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uint64_t{7768754303876232188u});
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EXPECT_EQ(Hash64("\xb6\xc0\xdd\x05\x3f\xc4\x86\x4c\xef", 9, kSeed),
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uint64_t{12439346786701492u});
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EXPECT_EQ(Hash64("\x9a\x5f\x78\x0d\xaf\x50\xe1\x1f\x55", 9, kSeed),
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uint64_t{10841838338450144690u});
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EXPECT_EQ(Hash64("\x22\x6f\x39\x1f\xf8\xdd\x4f\x52\x17\x94", 10, kSeed),
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uint64_t{12883919702069153152u});
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EXPECT_EQ(Hash64("\x32\x89\x2a\x75\x48\x3a\x4a\x02\x69\xdd", 10, kSeed),
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uint64_t{12692903507676842188u});
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EXPECT_EQ(Hash64("\x06\x92\x5c\xf4\x88\x0e\x7e\x68\x38\x3e", 10, kSeed),
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uint64_t{6540985900674032620u});
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EXPECT_EQ(Hash64("\xbd\x2c\x63\x38\xbf\xe9\x78\xb7\xbf\x15", 10, kSeed),
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uint64_t{10551812464348219044u});
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}
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std::string Hash64TestDescriptor(const char *repeat, size_t limit) {
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const char *mod61_encode =
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"abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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std::string input;
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while (input.size() < limit) {
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input.append(repeat);
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}
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std::string rv;
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for (size_t i = 0; i < limit; ++i) {
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uint64_t h = GetSliceHash64(Slice(input.data(), i));
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rv.append(1, mod61_encode[static_cast<size_t>(h % 61)]);
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}
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return rv;
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}
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// XXPH3 changes its algorithm for various sizes up through 250 bytes, so
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// we need to check the stability of larger sizes also.
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TEST(HashTest, Hash64LargeValueSchema) {
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// Each of these derives a "descriptor" from the hash values for all
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// lengths up to 430.
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// Note that "c" is common for the zero-length string.
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EXPECT_EQ(
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Hash64TestDescriptor("foo", 430),
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"cRhyWsY67B6klRA1udmOuiYuX7IthyGBKqbeosz2hzVglWCmQx8nEdnpkvPfYX56Up2OWOTV"
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"lTzfAoYwvtqKzjD8E9xttR2unelbXbIV67NUe6bOO23BxaSFRcA3njGu5cUWfgwOqNoTsszp"
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"uPvKRP6qaUR5VdoBkJUCFIefd7edlNK5mv6JYWaGdwxehg65hTkTmjZoPKxTZo4PLyzbL9U4"
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"xt12ITSfeP2MfBHuLI2z2pDlBb44UQKVMx27LEoAHsdLp3WfWfgH3sdRBRCHm33UxCM4QmE2"
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"xJ7gqSvNwTeH7v9GlC8zWbGroyD3UVNeShMLx29O7tH1biemLULwAHyIw8zdtLMDpEJ8m2ic"
|
|
"l6Lb4fDuuFNAs1GCVUthjK8CV8SWI8Rsz5THSwn5CGhpqUwSZcFknjwWIl5rNCvDxXJqYr");
|
|
// Note that "1EeRk" is common for "Rocks"
|
|
EXPECT_EQ(
|
|
Hash64TestDescriptor("Rocks", 430),
|
|
"c1EeRkrzgOYWLA8PuhJrwTePJewoB44WdXYDfhbk3ZxTqqg25WlPExDl7IKIQLJvnA6gJxxn"
|
|
"9TCSLkFGfJeXehaSS1GBqWSzfhEH4VXiXIUCuxJXxtKXcSC6FrNIQGTZbYDiUOLD6Y5inzrF"
|
|
"9etwQhXUBanw55xAUdNMFQAm2GjJ6UDWp2mISLiMMkLjANWMKLaZMqaFLX37qB4MRO1ooVRv"
|
|
"zSvaNRSCLxlggQCasQq8icWjzf3HjBlZtU6pd4rkaUxSzHqmo9oM5MghbU5Rtxg8wEfO7lVN"
|
|
"5wdMONYecslQTwjZUpO1K3LDf3K3XK6sUXM6ShQQ3RHmMn2acB4YtTZ3QQcHYJSOHn2DuWpa"
|
|
"Q8RqzX5lab92YmOLaCdOHq1BPsM7SIBzMdLgePNsJ1vvMALxAaoDUHPxoFLO2wx18IXnyX");
|
|
EXPECT_EQ(
|
|
Hash64TestDescriptor("RocksDB", 430),
|
|
"c1EeRkukbkb28wLTahwD2sfUhZzaBEnF8SVrxnPVB6A7b8CaAl3UKsDZISF92GSq2wDCukOq"
|
|
"Jgrsp7A3KZhDiLW8dFXp8UPqPxMCRlMdZeVeJ2dJxrmA6cyt99zkQFj7ELbut6jAeVqARFnw"
|
|
"fnWVXOsaLrq7bDCbMcns2DKvTaaqTCLMYxI7nhtLpFN1jR755FRQFcOzrrDbh7QhypjdvlYw"
|
|
"cdAMSZgp9JMHxbM23wPSuH6BOFgxejz35PScZfhDPvTOxIy1jc3MZsWrMC3P324zNolO7JdW"
|
|
"CX2I5UDKjjaEJfxbgVgJIXxtQGlmj2xkO5sPpjULQV4X2HlY7FQleJ4QRaJIB4buhCA4vUTF"
|
|
"eMFlxCIYUpTCsal2qsmnGOWa8WCcefrohMjDj1fjzSvSaQwlpyR1GZHF2uPOoQagiCpHpm");
|
|
}
|
|
|
|
TEST(HashTest, Hash128Misc) {
|
|
constexpr uint32_t kSeed = 0; // Same as GetSliceHash128
|
|
|
|
for (char fill : {'\0', 'a', '1', '\xff', 'e'}) {
|
|
const size_t max_size = 1000;
|
|
std::string str(max_size, fill);
|
|
|
|
if (fill == 'e') {
|
|
// Use different characters to check endianness handling
|
|
for (size_t i = 0; i < str.size(); ++i) {
|
|
str[i] += static_cast<char>(i);
|
|
}
|
|
}
|
|
|
|
for (size_t size = 0; size <= max_size; ++size) {
|
|
Unsigned128 here = Hash128(str.data(), size, kSeed);
|
|
|
|
// Must be same as unseeded Hash128 and GetSliceHash128
|
|
EXPECT_EQ(here, Hash128(str.data(), size));
|
|
EXPECT_EQ(here, GetSliceHash128(Slice(str.data(), size)));
|
|
{
|
|
uint64_t hi, lo;
|
|
Hash2x64(str.data(), size, &hi, &lo);
|
|
EXPECT_EQ(Lower64of128(here), lo);
|
|
EXPECT_EQ(Upper64of128(here), hi);
|
|
}
|
|
if (size == 16) {
|
|
const uint64_t in_hi = DecodeFixed64(str.data() + 8);
|
|
const uint64_t in_lo = DecodeFixed64(str.data());
|
|
uint64_t hi, lo;
|
|
BijectiveHash2x64(in_hi, in_lo, &hi, &lo);
|
|
EXPECT_EQ(Lower64of128(here), lo);
|
|
EXPECT_EQ(Upper64of128(here), hi);
|
|
uint64_t un_hi, un_lo;
|
|
BijectiveUnhash2x64(hi, lo, &un_hi, &un_lo);
|
|
EXPECT_EQ(in_lo, un_lo);
|
|
EXPECT_EQ(in_hi, un_hi);
|
|
}
|
|
|
|
// Upper and Lower must reconstruct hash
|
|
EXPECT_EQ(here,
|
|
(Unsigned128{Upper64of128(here)} << 64) | Lower64of128(here));
|
|
EXPECT_EQ(here,
|
|
(Unsigned128{Upper64of128(here)} << 64) ^ Lower64of128(here));
|
|
|
|
// Seed changes hash value (with high probability)
|
|
for (uint64_t var_seed = 1; var_seed != 0; var_seed <<= 1) {
|
|
Unsigned128 seeded = Hash128(str.data(), size, var_seed);
|
|
EXPECT_NE(here, seeded);
|
|
// Must match seeded Hash2x64
|
|
{
|
|
uint64_t hi, lo;
|
|
Hash2x64(str.data(), size, var_seed, &hi, &lo);
|
|
EXPECT_EQ(Lower64of128(seeded), lo);
|
|
EXPECT_EQ(Upper64of128(seeded), hi);
|
|
}
|
|
if (size == 16) {
|
|
const uint64_t in_hi = DecodeFixed64(str.data() + 8);
|
|
const uint64_t in_lo = DecodeFixed64(str.data());
|
|
uint64_t hi, lo;
|
|
BijectiveHash2x64(in_hi, in_lo, var_seed, &hi, &lo);
|
|
EXPECT_EQ(Lower64of128(seeded), lo);
|
|
EXPECT_EQ(Upper64of128(seeded), hi);
|
|
uint64_t un_hi, un_lo;
|
|
BijectiveUnhash2x64(hi, lo, var_seed, &un_hi, &un_lo);
|
|
EXPECT_EQ(in_lo, un_lo);
|
|
EXPECT_EQ(in_hi, un_hi);
|
|
}
|
|
}
|
|
|
|
// Size changes hash value (with high probability)
|
|
size_t max_smaller_by = std::min(size_t{30}, size);
|
|
for (size_t smaller_by = 1; smaller_by <= max_smaller_by; ++smaller_by) {
|
|
EXPECT_NE(here, Hash128(str.data(), size - smaller_by, kSeed));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Test that hash values are "non-trivial" for "trivial" inputs
|
|
TEST(HashTest, Hash128Trivial) {
|
|
// Thorough test too slow for regression testing
|
|
constexpr bool thorough = false;
|
|
|
|
// For various seeds, make sure hash of empty string is not zero.
|
|
constexpr uint64_t max_seed = thorough ? 0x1000000 : 0x10000;
|
|
for (uint64_t seed = 0; seed < max_seed; ++seed) {
|
|
Unsigned128 here = Hash128("", 0, seed);
|
|
EXPECT_NE(Lower64of128(here), 0u);
|
|
EXPECT_NE(Upper64of128(here), 0u);
|
|
}
|
|
|
|
// For standard seed, make sure hash of small strings are not zero
|
|
constexpr uint32_t kSeed = 0; // Same as GetSliceHash128
|
|
char input[4];
|
|
constexpr int max_len = thorough ? 3 : 2;
|
|
for (int len = 1; len <= max_len; ++len) {
|
|
for (uint32_t i = 0; (i >> (len * 8)) == 0; ++i) {
|
|
EncodeFixed32(input, i);
|
|
Unsigned128 here = Hash128(input, len, kSeed);
|
|
EXPECT_NE(Lower64of128(here), 0u);
|
|
EXPECT_NE(Upper64of128(here), 0u);
|
|
}
|
|
}
|
|
}
|
|
|
|
std::string Hash128TestDescriptor(const char *repeat, size_t limit) {
|
|
const char *mod61_encode =
|
|
"abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
|
|
|
|
std::string input;
|
|
while (input.size() < limit) {
|
|
input.append(repeat);
|
|
}
|
|
std::string rv;
|
|
for (size_t i = 0; i < limit; ++i) {
|
|
auto h = GetSliceHash128(Slice(input.data(), i));
|
|
uint64_t h2 = Upper64of128(h) + Lower64of128(h);
|
|
rv.append(1, mod61_encode[static_cast<size_t>(h2 % 61)]);
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
// XXH3 changes its algorithm for various sizes up through 250 bytes, so
|
|
// we need to check the stability of larger sizes also.
|
|
TEST(HashTest, Hash128ValueSchema) {
|
|
// Each of these derives a "descriptor" from the hash values for all
|
|
// lengths up to 430.
|
|
// Note that "b" is common for the zero-length string.
|
|
EXPECT_EQ(
|
|
Hash128TestDescriptor("foo", 430),
|
|
"bUMA3As8n9I4vNGhThXlEevxZlyMcbb6TYAlIKJ2f5ponsv99q962rYclQ7u3gfnRdCDQ5JI"
|
|
"2LrGUaCycbXrvLFe4SjgRb9RQwCfrnmNQ7VSEwSKMnkGCK3bDbXSrnIh5qLXdtvIZklbJpGH"
|
|
"Dqr93BlqF9ubTnOSYkSdx89XvQqflMIW8bjfQp9BPjQejWOeEQspnN1D3sfgVdFhpaQdHYA5"
|
|
"pI2XcPlCMFPxvrFuRr7joaDvjNe9IUZaunLPMewuXmC3EL95h52Ju3D7y9RNKhgYxMTrA84B"
|
|
"yJrMvyjdm3vlBxet4EN7v2GEyjbGuaZW9UL6lrX6PghJDg7ACfLGdxNbH3qXM4zaiG2RKnL5"
|
|
"S3WXKR78RBB5fRFQ8KDIEQjHFvSNsc3GrAEi6W8P2lv8JMTzjBODO2uN4wadVQFT9wpGfV");
|
|
// Note that "35D2v" is common for "Rocks"
|
|
EXPECT_EQ(
|
|
Hash128TestDescriptor("Rocks", 430),
|
|
"b35D2vzvklFVDqJmyLRXyApwGGO3EAT3swhe8XJAN3mY2UVPglzdmydxcba6JI2tSvwO6zSu"
|
|
"ANpjSM7tc9G5iMhsa7R8GfyCXRO1TnLg7HvdWNdgGGBirxZR68BgT7TQsYJt6zyEyISeXI1n"
|
|
"MXA48Xo7dWfJeYN6Z4KWlqZY7TgFXGbks9AX4ehZNSGtIhdO5i58qlgVX1bEejeOVaCcjC79"
|
|
"67DrMfOKds7rUQzjBa77sMPcoPW1vu6ljGJPZH3XkRyDMZ1twxXKkNxN3tE8nR7JHwyqBAxE"
|
|
"fTcjbOWrLZ1irWxRSombD8sGDEmclgF11IxqEhe3Rt7gyofO3nExGckKkS9KfRqsCHbiUyva"
|
|
"JGkJwUHRXaZnh58b4i1Ei9aQKZjXlvIVDixoZrjcNaH5XJIJlRZce9Z9t82wYapTpckYSg");
|
|
EXPECT_EQ(
|
|
Hash128TestDescriptor("RocksDB", 430),
|
|
"b35D2vFUst3XDZCRlSrhmYYakmqImV97LbBsV6EZlOEQpUPH1d1sD3xMKAPlA5UErHehg5O7"
|
|
"n966fZqhAf3hRc24kGCLfNAWjyUa7vSNOx3IcPoTyVRFZeFlcCtfl7t1QJumHOCpS33EBmBF"
|
|
"hvK13QjBbDWYWeHQhJhgV9Mqbx17TIcvUkEnYZxb8IzWNmjVsJG44Z7v52DjGj1ZzS62S2Vv"
|
|
"qWcDO7apvH5VHg68E9Wl6nXP21vlmUqEH9GeWRehfWVvY7mUpsAg5drHHQyDSdiMceiUuUxJ"
|
|
"XJqHFcDdzbbPk7xDvbLgWCKvH8k3MpQNWOmbSSRDdAP6nGlDjoTToYkcqVREHJzztSWAAq5h"
|
|
"GHSUNJ6OxsMHhf8EhXfHtKyUzRmPtjYyeckQcGmrQfFFLidc6cjMDKCdBG6c6HVBrS7H2R");
|
|
}
|
|
|
|
TEST(FastRange32Test, Values) {
|
|
using ROCKSDB_NAMESPACE::FastRange32;
|
|
// Zero range
|
|
EXPECT_EQ(FastRange32(0, 0), 0U);
|
|
EXPECT_EQ(FastRange32(123, 0), 0U);
|
|
EXPECT_EQ(FastRange32(0xffffffff, 0), 0U);
|
|
|
|
// One range
|
|
EXPECT_EQ(FastRange32(0, 1), 0U);
|
|
EXPECT_EQ(FastRange32(123, 1), 0U);
|
|
EXPECT_EQ(FastRange32(0xffffffff, 1), 0U);
|
|
|
|
// Two range
|
|
EXPECT_EQ(FastRange32(0, 2), 0U);
|
|
EXPECT_EQ(FastRange32(123, 2), 0U);
|
|
EXPECT_EQ(FastRange32(0x7fffffff, 2), 0U);
|
|
EXPECT_EQ(FastRange32(0x80000000, 2), 1U);
|
|
EXPECT_EQ(FastRange32(0xffffffff, 2), 1U);
|
|
|
|
// Seven range
|
|
EXPECT_EQ(FastRange32(0, 7), 0U);
|
|
EXPECT_EQ(FastRange32(123, 7), 0U);
|
|
EXPECT_EQ(FastRange32(613566756, 7), 0U);
|
|
EXPECT_EQ(FastRange32(613566757, 7), 1U);
|
|
EXPECT_EQ(FastRange32(1227133513, 7), 1U);
|
|
EXPECT_EQ(FastRange32(1227133514, 7), 2U);
|
|
// etc.
|
|
EXPECT_EQ(FastRange32(0xffffffff, 7), 6U);
|
|
|
|
// Big
|
|
EXPECT_EQ(FastRange32(1, 0x80000000), 0U);
|
|
EXPECT_EQ(FastRange32(2, 0x80000000), 1U);
|
|
EXPECT_EQ(FastRange32(4, 0x7fffffff), 1U);
|
|
EXPECT_EQ(FastRange32(4, 0x80000000), 2U);
|
|
EXPECT_EQ(FastRange32(0xffffffff, 0x7fffffff), 0x7ffffffeU);
|
|
EXPECT_EQ(FastRange32(0xffffffff, 0x80000000), 0x7fffffffU);
|
|
}
|
|
|
|
TEST(FastRange64Test, Values) {
|
|
using ROCKSDB_NAMESPACE::FastRange64;
|
|
// Zero range
|
|
EXPECT_EQ(FastRange64(0, 0), 0U);
|
|
EXPECT_EQ(FastRange64(123, 0), 0U);
|
|
EXPECT_EQ(FastRange64(0xffffFFFF, 0), 0U);
|
|
EXPECT_EQ(FastRange64(0xffffFFFFffffFFFF, 0), 0U);
|
|
|
|
// One range
|
|
EXPECT_EQ(FastRange64(0, 1), 0U);
|
|
EXPECT_EQ(FastRange64(123, 1), 0U);
|
|
EXPECT_EQ(FastRange64(0xffffFFFF, 1), 0U);
|
|
EXPECT_EQ(FastRange64(0xffffFFFFffffFFFF, 1), 0U);
|
|
|
|
// Two range
|
|
EXPECT_EQ(FastRange64(0, 2), 0U);
|
|
EXPECT_EQ(FastRange64(123, 2), 0U);
|
|
EXPECT_EQ(FastRange64(0xffffFFFF, 2), 0U);
|
|
EXPECT_EQ(FastRange64(0x7fffFFFFffffFFFF, 2), 0U);
|
|
EXPECT_EQ(FastRange64(0x8000000000000000, 2), 1U);
|
|
EXPECT_EQ(FastRange64(0xffffFFFFffffFFFF, 2), 1U);
|
|
|
|
// Seven range
|
|
EXPECT_EQ(FastRange64(0, 7), 0U);
|
|
EXPECT_EQ(FastRange64(123, 7), 0U);
|
|
EXPECT_EQ(FastRange64(0xffffFFFF, 7), 0U);
|
|
EXPECT_EQ(FastRange64(2635249153387078802, 7), 0U);
|
|
EXPECT_EQ(FastRange64(2635249153387078803, 7), 1U);
|
|
EXPECT_EQ(FastRange64(5270498306774157604, 7), 1U);
|
|
EXPECT_EQ(FastRange64(5270498306774157605, 7), 2U);
|
|
EXPECT_EQ(FastRange64(0x7fffFFFFffffFFFF, 7), 3U);
|
|
EXPECT_EQ(FastRange64(0x8000000000000000, 7), 3U);
|
|
EXPECT_EQ(FastRange64(0xffffFFFFffffFFFF, 7), 6U);
|
|
|
|
// Big but 32-bit range
|
|
EXPECT_EQ(FastRange64(0x100000000, 0x80000000), 0U);
|
|
EXPECT_EQ(FastRange64(0x200000000, 0x80000000), 1U);
|
|
EXPECT_EQ(FastRange64(0x400000000, 0x7fffFFFF), 1U);
|
|
EXPECT_EQ(FastRange64(0x400000000, 0x80000000), 2U);
|
|
EXPECT_EQ(FastRange64(0xffffFFFFffffFFFF, 0x7fffFFFF), 0x7fffFFFEU);
|
|
EXPECT_EQ(FastRange64(0xffffFFFFffffFFFF, 0x80000000), 0x7fffFFFFU);
|
|
|
|
// Big, > 32-bit range
|
|
#if SIZE_MAX == UINT64_MAX
|
|
EXPECT_EQ(FastRange64(0x7fffFFFFffffFFFF, 0x4200000002), 0x2100000000U);
|
|
EXPECT_EQ(FastRange64(0x8000000000000000, 0x4200000002), 0x2100000001U);
|
|
|
|
EXPECT_EQ(FastRange64(0x0000000000000000, 420000000002), 0U);
|
|
EXPECT_EQ(FastRange64(0x7fffFFFFffffFFFF, 420000000002), 210000000000U);
|
|
EXPECT_EQ(FastRange64(0x8000000000000000, 420000000002), 210000000001U);
|
|
EXPECT_EQ(FastRange64(0xffffFFFFffffFFFF, 420000000002), 420000000001U);
|
|
|
|
EXPECT_EQ(FastRange64(0xffffFFFFffffFFFF, 0xffffFFFFffffFFFF),
|
|
0xffffFFFFffffFFFEU);
|
|
#endif
|
|
}
|
|
|
|
TEST(FastRangeGenericTest, Values) {
|
|
using ROCKSDB_NAMESPACE::FastRangeGeneric;
|
|
// Generic (including big and small)
|
|
// Note that FastRangeGeneric is also tested indirectly above via
|
|
// FastRange32 and FastRange64.
|
|
EXPECT_EQ(
|
|
FastRangeGeneric(uint64_t{0x8000000000000000}, uint64_t{420000000002}),
|
|
uint64_t{210000000001});
|
|
EXPECT_EQ(FastRangeGeneric(uint64_t{0x8000000000000000}, uint16_t{12468}),
|
|
uint16_t{6234});
|
|
EXPECT_EQ(FastRangeGeneric(uint32_t{0x80000000}, uint16_t{12468}),
|
|
uint16_t{6234});
|
|
// Not recommended for typical use because for example this could fail on
|
|
// some platforms and pass on others:
|
|
//EXPECT_EQ(FastRangeGeneric(static_cast<unsigned long>(0x80000000),
|
|
// uint16_t{12468}),
|
|
// uint16_t{6234});
|
|
}
|
|
|
|
// for inspection of disassembly
|
|
uint32_t FastRange32(uint32_t hash, uint32_t range) {
|
|
return ROCKSDB_NAMESPACE::FastRange32(hash, range);
|
|
}
|
|
|
|
// for inspection of disassembly
|
|
size_t FastRange64(uint64_t hash, size_t range) {
|
|
return ROCKSDB_NAMESPACE::FastRange64(hash, range);
|
|
}
|
|
|
|
// Tests for math.h / math128.h (not worth a separate test binary)
|
|
using ROCKSDB_NAMESPACE::BitParity;
|
|
using ROCKSDB_NAMESPACE::BitsSetToOne;
|
|
using ROCKSDB_NAMESPACE::ConstexprFloorLog2;
|
|
using ROCKSDB_NAMESPACE::CountTrailingZeroBits;
|
|
using ROCKSDB_NAMESPACE::DecodeFixed128;
|
|
using ROCKSDB_NAMESPACE::DecodeFixedGeneric;
|
|
using ROCKSDB_NAMESPACE::EncodeFixed128;
|
|
using ROCKSDB_NAMESPACE::EncodeFixedGeneric;
|
|
using ROCKSDB_NAMESPACE::FloorLog2;
|
|
using ROCKSDB_NAMESPACE::Lower64of128;
|
|
using ROCKSDB_NAMESPACE::Multiply64to128;
|
|
using ROCKSDB_NAMESPACE::Unsigned128;
|
|
using ROCKSDB_NAMESPACE::Upper64of128;
|
|
|
|
template <typename T>
|
|
static void test_BitOps() {
|
|
// This complex code is to generalize to 128-bit values. Otherwise
|
|
// we could just use = static_cast<T>(0x5555555555555555ULL);
|
|
T everyOtherBit = 0;
|
|
for (unsigned i = 0; i < sizeof(T); ++i) {
|
|
everyOtherBit = (everyOtherBit << 8) | T{0x55};
|
|
}
|
|
|
|
// This one built using bit operations, as our 128-bit layer
|
|
// might not implement arithmetic such as subtraction.
|
|
T vm1 = 0; // "v minus one"
|
|
|
|
for (int i = 0; i < int{8 * sizeof(T)}; ++i) {
|
|
T v = T{1} << i;
|
|
// If we could directly use arithmetic:
|
|
// T vm1 = static_cast<T>(v - 1);
|
|
|
|
// FloorLog2
|
|
if (v > 0) {
|
|
EXPECT_EQ(FloorLog2(v), i);
|
|
EXPECT_EQ(ConstexprFloorLog2(v), i);
|
|
}
|
|
if (vm1 > 0) {
|
|
EXPECT_EQ(FloorLog2(vm1), i - 1);
|
|
EXPECT_EQ(ConstexprFloorLog2(vm1), i - 1);
|
|
EXPECT_EQ(FloorLog2(everyOtherBit & vm1), (i - 1) & ~1);
|
|
EXPECT_EQ(ConstexprFloorLog2(everyOtherBit & vm1), (i - 1) & ~1);
|
|
}
|
|
|
|
// CountTrailingZeroBits
|
|
if (v != 0) {
|
|
EXPECT_EQ(CountTrailingZeroBits(v), i);
|
|
}
|
|
if (vm1 != 0) {
|
|
EXPECT_EQ(CountTrailingZeroBits(vm1), 0);
|
|
}
|
|
if (i < int{8 * sizeof(T)} - 1) {
|
|
EXPECT_EQ(CountTrailingZeroBits(~vm1 & everyOtherBit), (i + 1) & ~1);
|
|
}
|
|
|
|
// BitsSetToOne
|
|
EXPECT_EQ(BitsSetToOne(v), 1);
|
|
EXPECT_EQ(BitsSetToOne(vm1), i);
|
|
EXPECT_EQ(BitsSetToOne(vm1 & everyOtherBit), (i + 1) / 2);
|
|
|
|
// BitParity
|
|
EXPECT_EQ(BitParity(v), 1);
|
|
EXPECT_EQ(BitParity(vm1), i & 1);
|
|
EXPECT_EQ(BitParity(vm1 & everyOtherBit), ((i + 1) / 2) & 1);
|
|
|
|
// EndianSwapValue
|
|
T ev = T{1} << (((sizeof(T) - 1 - (i / 8)) * 8) + i % 8);
|
|
EXPECT_EQ(EndianSwapValue(v), ev);
|
|
|
|
// ReverseBits
|
|
EXPECT_EQ(ReverseBits(v), static_cast<T>(T{1} << (8 * sizeof(T) - 1 - i)));
|
|
#ifdef HAVE_UINT128_EXTENSION // Uses multiplication
|
|
if (std::is_unsigned<T>::value) { // Technical UB on signed type
|
|
T rv = T{1} << (8 * sizeof(T) - 1 - i);
|
|
EXPECT_EQ(ReverseBits(vm1), static_cast<T>(rv * ~T{1}));
|
|
}
|
|
#endif
|
|
vm1 = (vm1 << 1) | 1;
|
|
}
|
|
|
|
EXPECT_EQ(ConstexprFloorLog2(T{1}), 0);
|
|
EXPECT_EQ(ConstexprFloorLog2(T{2}), 1);
|
|
EXPECT_EQ(ConstexprFloorLog2(T{3}), 1);
|
|
EXPECT_EQ(ConstexprFloorLog2(T{42}), 5);
|
|
}
|
|
|
|
TEST(MathTest, BitOps) {
|
|
test_BitOps<uint32_t>();
|
|
test_BitOps<uint64_t>();
|
|
test_BitOps<uint16_t>();
|
|
test_BitOps<uint8_t>();
|
|
test_BitOps<unsigned char>();
|
|
test_BitOps<unsigned short>();
|
|
test_BitOps<unsigned int>();
|
|
test_BitOps<unsigned long>();
|
|
test_BitOps<unsigned long long>();
|
|
test_BitOps<char>();
|
|
test_BitOps<size_t>();
|
|
test_BitOps<int32_t>();
|
|
test_BitOps<int64_t>();
|
|
test_BitOps<int16_t>();
|
|
test_BitOps<int8_t>();
|
|
test_BitOps<signed char>();
|
|
test_BitOps<short>();
|
|
test_BitOps<int>();
|
|
test_BitOps<long>();
|
|
test_BitOps<long long>();
|
|
test_BitOps<ptrdiff_t>();
|
|
}
|
|
|
|
TEST(MathTest, BitOps128) { test_BitOps<Unsigned128>(); }
|
|
|
|
TEST(MathTest, Math128) {
|
|
const Unsigned128 sixteenHexOnes = 0x1111111111111111U;
|
|
const Unsigned128 thirtyHexOnes = (sixteenHexOnes << 56) | sixteenHexOnes;
|
|
const Unsigned128 sixteenHexTwos = 0x2222222222222222U;
|
|
const Unsigned128 thirtyHexTwos = (sixteenHexTwos << 56) | sixteenHexTwos;
|
|
|
|
// v will slide from all hex ones to all hex twos
|
|
Unsigned128 v = thirtyHexOnes;
|
|
for (int i = 0; i <= 30; ++i) {
|
|
// Test bitwise operations
|
|
EXPECT_EQ(BitsSetToOne(v), 30);
|
|
EXPECT_EQ(BitsSetToOne(~v), 128 - 30);
|
|
EXPECT_EQ(BitsSetToOne(v & thirtyHexOnes), 30 - i);
|
|
EXPECT_EQ(BitsSetToOne(v | thirtyHexOnes), 30 + i);
|
|
EXPECT_EQ(BitsSetToOne(v ^ thirtyHexOnes), 2 * i);
|
|
EXPECT_EQ(BitsSetToOne(v & thirtyHexTwos), i);
|
|
EXPECT_EQ(BitsSetToOne(v | thirtyHexTwos), 60 - i);
|
|
EXPECT_EQ(BitsSetToOne(v ^ thirtyHexTwos), 60 - 2 * i);
|
|
|
|
// Test comparisons
|
|
EXPECT_EQ(v == thirtyHexOnes, i == 0);
|
|
EXPECT_EQ(v == thirtyHexTwos, i == 30);
|
|
EXPECT_EQ(v > thirtyHexOnes, i > 0);
|
|
EXPECT_EQ(v > thirtyHexTwos, false);
|
|
EXPECT_EQ(v >= thirtyHexOnes, true);
|
|
EXPECT_EQ(v >= thirtyHexTwos, i == 30);
|
|
EXPECT_EQ(v < thirtyHexOnes, false);
|
|
EXPECT_EQ(v < thirtyHexTwos, i < 30);
|
|
EXPECT_EQ(v <= thirtyHexOnes, i == 0);
|
|
EXPECT_EQ(v <= thirtyHexTwos, true);
|
|
|
|
// Update v, clearing upper-most byte
|
|
v = ((v << 12) >> 8) | 0x2;
|
|
}
|
|
|
|
for (int i = 0; i < 128; ++i) {
|
|
// Test shifts
|
|
Unsigned128 sl = thirtyHexOnes << i;
|
|
Unsigned128 sr = thirtyHexOnes >> i;
|
|
EXPECT_EQ(BitsSetToOne(sl), std::min(30, 32 - i / 4));
|
|
EXPECT_EQ(BitsSetToOne(sr), std::max(0, 30 - (i + 3) / 4));
|
|
EXPECT_EQ(BitsSetToOne(sl & sr), i % 2 ? 0 : std::max(0, 30 - i / 2));
|
|
}
|
|
|
|
// Test 64x64->128 multiply
|
|
Unsigned128 product =
|
|
Multiply64to128(0x1111111111111111U, 0x2222222222222222U);
|
|
EXPECT_EQ(Lower64of128(product), 2295594818061633090U);
|
|
EXPECT_EQ(Upper64of128(product), 163971058432973792U);
|
|
}
|
|
|
|
TEST(MathTest, Coding128) {
|
|
const char *in = "_1234567890123456";
|
|
// Note: in + 1 is likely unaligned
|
|
Unsigned128 decoded = DecodeFixed128(in + 1);
|
|
EXPECT_EQ(Lower64of128(decoded), 0x3837363534333231U);
|
|
EXPECT_EQ(Upper64of128(decoded), 0x3635343332313039U);
|
|
char out[18];
|
|
out[0] = '_';
|
|
EncodeFixed128(out + 1, decoded);
|
|
out[17] = '\0';
|
|
EXPECT_EQ(std::string(in), std::string(out));
|
|
}
|
|
|
|
TEST(MathTest, CodingGeneric) {
|
|
const char *in = "_1234567890123456";
|
|
// Decode
|
|
// Note: in + 1 is likely unaligned
|
|
Unsigned128 decoded128 = DecodeFixedGeneric<Unsigned128>(in + 1);
|
|
EXPECT_EQ(Lower64of128(decoded128), 0x3837363534333231U);
|
|
EXPECT_EQ(Upper64of128(decoded128), 0x3635343332313039U);
|
|
|
|
uint64_t decoded64 = DecodeFixedGeneric<uint64_t>(in + 1);
|
|
EXPECT_EQ(decoded64, 0x3837363534333231U);
|
|
|
|
uint32_t decoded32 = DecodeFixedGeneric<uint32_t>(in + 1);
|
|
EXPECT_EQ(decoded32, 0x34333231U);
|
|
|
|
uint16_t decoded16 = DecodeFixedGeneric<uint16_t>(in + 1);
|
|
EXPECT_EQ(decoded16, 0x3231U);
|
|
|
|
// Encode
|
|
char out[18];
|
|
out[0] = '_';
|
|
memset(out + 1, '\0', 17);
|
|
EncodeFixedGeneric(out + 1, decoded128);
|
|
EXPECT_EQ(std::string(in), std::string(out));
|
|
|
|
memset(out + 1, '\0', 9);
|
|
EncodeFixedGeneric(out + 1, decoded64);
|
|
EXPECT_EQ(std::string("_12345678"), std::string(out));
|
|
|
|
memset(out + 1, '\0', 5);
|
|
EncodeFixedGeneric(out + 1, decoded32);
|
|
EXPECT_EQ(std::string("_1234"), std::string(out));
|
|
|
|
memset(out + 1, '\0', 3);
|
|
EncodeFixedGeneric(out + 1, decoded16);
|
|
EXPECT_EQ(std::string("_12"), std::string(out));
|
|
}
|
|
|
|
int main(int argc, char** argv) {
|
|
fprintf(stderr, "NPHash64 id: %x\n",
|
|
static_cast<int>(ROCKSDB_NAMESPACE::GetSliceNPHash64("RocksDB")));
|
|
::testing::InitGoogleTest(&argc, argv);
|
|
|
|
return RUN_ALL_TESTS();
|
|
}
|