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rocksdb/util/crc32c.cc
Zhichao Cao a904c62d28 Using existing crc32c checksum in checksum handoff for Manifest and WAL (#8412) 
Summary:
In PR https://github.com/facebook/rocksdb/issues/7523 , checksum handoff is introduced in RocksDB for WAL, Manifest, and SST files. When user enable checksum handoff for a certain type of file, before the data is written to the lower layer storage system, we calculate the checksum (crc32c) of each piece of data and pass the checksum down with the data, such that data verification can be down by the lower layer storage system if it has the capability. However, it cannot cover the whole lifetime of the data in the memory and also it potentially introduces extra checksum calculation overhead.

In this PR, we introduce a new interface in WritableFileWriter::Append, which allows the caller be able to pass the data and the checksum (crc32c) together. In this way, WritableFileWriter can directly use the pass-in checksum (crc32c) to generate the checksum of data being passed down to the storage system. It saves the calculation overhead and achieves higher protection coverage. When a new checksum is added with the data, we use Crc32cCombine https://github.com/facebook/rocksdb/issues/8305 to combine the existing checksum and the new checksum. To avoid the segmenting of data by rate-limiter before it is stored, rate-limiter is called enough times to accumulate enough credits for a certain write. This design only support Manifest and WAL which use log_writer in the current stage.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8412

Test Plan: make check, add new testing cases.

Reviewed By: anand1976

Differential Revision: D29151545

Pulled By: zhichao-cao

fbshipit-source-id: 75e2278c5126cfd58393c67b1efd18dcc7a30772
2021-06-25 00:47:17 -07:00

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
//
// A portable implementation of crc32c, optimized to handle
// four bytes at a time.
#include "util/crc32c.h"
#include <stdint.h>
#include <array>
#include <utility>
#ifdef HAVE_SSE42
#include <nmmintrin.h>
#include <wmmintrin.h>
#endif
#include "port/lang.h"
#include "util/coding.h"
#include "util/crc32c_arm64.h"
#include "util/math.h"
#ifdef __powerpc64__
#include "util/crc32c_ppc.h"
#include "util/crc32c_ppc_constants.h"
#if __linux__
#ifdef ROCKSDB_AUXV_GETAUXVAL_PRESENT
#include <sys/auxv.h>
#endif
#ifndef PPC_FEATURE2_VEC_CRYPTO
#define PPC_FEATURE2_VEC_CRYPTO 0x02000000
#endif
#ifndef AT_HWCAP2
#define AT_HWCAP2 26
#endif
#elif __FreeBSD__
#include <machine/cpu.h>
#include <sys/auxv.h>
#include <sys/elf_common.h>
#endif /* __linux__ */
#endif
#if defined(HAVE_ARM64_CRC)
bool pmull_runtime_flag = false;
#endif
namespace ROCKSDB_NAMESPACE {
namespace crc32c {
#if defined(HAVE_POWER8) && defined(HAS_ALTIVEC)
#ifdef __powerpc64__
static int arch_ppc_crc32 = 0;
#endif /* __powerpc64__ */
#endif
static const uint32_t table0_[256] = {
0x00000000, 0xf26b8303, 0xe13b70f7, 0x1350f3f4,
0xc79a971f, 0x35f1141c, 0x26a1e7e8, 0xd4ca64eb,
0x8ad958cf, 0x78b2dbcc, 0x6be22838, 0x9989ab3b,
0x4d43cfd0, 0xbf284cd3, 0xac78bf27, 0x5e133c24,
0x105ec76f, 0xe235446c, 0xf165b798, 0x030e349b,
0xd7c45070, 0x25afd373, 0x36ff2087, 0xc494a384,
0x9a879fa0, 0x68ec1ca3, 0x7bbcef57, 0x89d76c54,
0x5d1d08bf, 0xaf768bbc, 0xbc267848, 0x4e4dfb4b,
0x20bd8ede, 0xd2d60ddd, 0xc186fe29, 0x33ed7d2a,
0xe72719c1, 0x154c9ac2, 0x061c6936, 0xf477ea35,
0xaa64d611, 0x580f5512, 0x4b5fa6e6, 0xb93425e5,
0x6dfe410e, 0x9f95c20d, 0x8cc531f9, 0x7eaeb2fa,
0x30e349b1, 0xc288cab2, 0xd1d83946, 0x23b3ba45,
0xf779deae, 0x05125dad, 0x1642ae59, 0xe4292d5a,
0xba3a117e, 0x4851927d, 0x5b016189, 0xa96ae28a,
0x7da08661, 0x8fcb0562, 0x9c9bf696, 0x6ef07595,
0x417b1dbc, 0xb3109ebf, 0xa0406d4b, 0x522bee48,
0x86e18aa3, 0x748a09a0, 0x67dafa54, 0x95b17957,
0xcba24573, 0x39c9c670, 0x2a993584, 0xd8f2b687,
0x0c38d26c, 0xfe53516f, 0xed03a29b, 0x1f682198,
0x5125dad3, 0xa34e59d0, 0xb01eaa24, 0x42752927,
0x96bf4dcc, 0x64d4cecf, 0x77843d3b, 0x85efbe38,
0xdbfc821c, 0x2997011f, 0x3ac7f2eb, 0xc8ac71e8,
0x1c661503, 0xee0d9600, 0xfd5d65f4, 0x0f36e6f7,
0x61c69362, 0x93ad1061, 0x80fde395, 0x72966096,
0xa65c047d, 0x5437877e, 0x4767748a, 0xb50cf789,
0xeb1fcbad, 0x197448ae, 0x0a24bb5a, 0xf84f3859,
0x2c855cb2, 0xdeeedfb1, 0xcdbe2c45, 0x3fd5af46,
0x7198540d, 0x83f3d70e, 0x90a324fa, 0x62c8a7f9,
0xb602c312, 0x44694011, 0x5739b3e5, 0xa55230e6,
0xfb410cc2, 0x092a8fc1, 0x1a7a7c35, 0xe811ff36,
0x3cdb9bdd, 0xceb018de, 0xdde0eb2a, 0x2f8b6829,
0x82f63b78, 0x709db87b, 0x63cd4b8f, 0x91a6c88c,
0x456cac67, 0xb7072f64, 0xa457dc90, 0x563c5f93,
0x082f63b7, 0xfa44e0b4, 0xe9141340, 0x1b7f9043,
0xcfb5f4a8, 0x3dde77ab, 0x2e8e845f, 0xdce5075c,
0x92a8fc17, 0x60c37f14, 0x73938ce0, 0x81f80fe3,
0x55326b08, 0xa759e80b, 0xb4091bff, 0x466298fc,
0x1871a4d8, 0xea1a27db, 0xf94ad42f, 0x0b21572c,
0xdfeb33c7, 0x2d80b0c4, 0x3ed04330, 0xccbbc033,
0xa24bb5a6, 0x502036a5, 0x4370c551, 0xb11b4652,
0x65d122b9, 0x97baa1ba, 0x84ea524e, 0x7681d14d,
0x2892ed69, 0xdaf96e6a, 0xc9a99d9e, 0x3bc21e9d,
0xef087a76, 0x1d63f975, 0x0e330a81, 0xfc588982,
0xb21572c9, 0x407ef1ca, 0x532e023e, 0xa145813d,
0x758fe5d6, 0x87e466d5, 0x94b49521, 0x66df1622,
0x38cc2a06, 0xcaa7a905, 0xd9f75af1, 0x2b9cd9f2,
0xff56bd19, 0x0d3d3e1a, 0x1e6dcdee, 0xec064eed,
0xc38d26c4, 0x31e6a5c7, 0x22b65633, 0xd0ddd530,
0x0417b1db, 0xf67c32d8, 0xe52cc12c, 0x1747422f,
0x49547e0b, 0xbb3ffd08, 0xa86f0efc, 0x5a048dff,
0x8ecee914, 0x7ca56a17, 0x6ff599e3, 0x9d9e1ae0,
0xd3d3e1ab, 0x21b862a8, 0x32e8915c, 0xc083125f,
0x144976b4, 0xe622f5b7, 0xf5720643, 0x07198540,
0x590ab964, 0xab613a67, 0xb831c993, 0x4a5a4a90,
0x9e902e7b, 0x6cfbad78, 0x7fab5e8c, 0x8dc0dd8f,
0xe330a81a, 0x115b2b19, 0x020bd8ed, 0xf0605bee,
0x24aa3f05, 0xd6c1bc06, 0xc5914ff2, 0x37faccf1,
0x69e9f0d5, 0x9b8273d6, 0x88d28022, 0x7ab90321,
0xae7367ca, 0x5c18e4c9, 0x4f48173d, 0xbd23943e,
0xf36e6f75, 0x0105ec76, 0x12551f82, 0xe03e9c81,
0x34f4f86a, 0xc69f7b69, 0xd5cf889d, 0x27a40b9e,
0x79b737ba, 0x8bdcb4b9, 0x988c474d, 0x6ae7c44e,
0xbe2da0a5, 0x4c4623a6, 0x5f16d052, 0xad7d5351
};
static const uint32_t table1_[256] = {
0x00000000, 0x13a29877, 0x274530ee, 0x34e7a899,
0x4e8a61dc, 0x5d28f9ab, 0x69cf5132, 0x7a6dc945,
0x9d14c3b8, 0x8eb65bcf, 0xba51f356, 0xa9f36b21,
0xd39ea264, 0xc03c3a13, 0xf4db928a, 0xe7790afd,
0x3fc5f181, 0x2c6769f6, 0x1880c16f, 0x0b225918,
0x714f905d, 0x62ed082a, 0x560aa0b3, 0x45a838c4,
0xa2d13239, 0xb173aa4e, 0x859402d7, 0x96369aa0,
0xec5b53e5, 0xfff9cb92, 0xcb1e630b, 0xd8bcfb7c,
0x7f8be302, 0x6c297b75, 0x58ced3ec, 0x4b6c4b9b,
0x310182de, 0x22a31aa9, 0x1644b230, 0x05e62a47,
0xe29f20ba, 0xf13db8cd, 0xc5da1054, 0xd6788823,
0xac154166, 0xbfb7d911, 0x8b507188, 0x98f2e9ff,
0x404e1283, 0x53ec8af4, 0x670b226d, 0x74a9ba1a,
0x0ec4735f, 0x1d66eb28, 0x298143b1, 0x3a23dbc6,
0xdd5ad13b, 0xcef8494c, 0xfa1fe1d5, 0xe9bd79a2,
0x93d0b0e7, 0x80722890, 0xb4958009, 0xa737187e,
0xff17c604, 0xecb55e73, 0xd852f6ea, 0xcbf06e9d,
0xb19da7d8, 0xa23f3faf, 0x96d89736, 0x857a0f41,
0x620305bc, 0x71a19dcb, 0x45463552, 0x56e4ad25,
0x2c896460, 0x3f2bfc17, 0x0bcc548e, 0x186eccf9,
0xc0d23785, 0xd370aff2, 0xe797076b, 0xf4359f1c,
0x8e585659, 0x9dface2e, 0xa91d66b7, 0xbabffec0,
0x5dc6f43d, 0x4e646c4a, 0x7a83c4d3, 0x69215ca4,
0x134c95e1, 0x00ee0d96, 0x3409a50f, 0x27ab3d78,
0x809c2506, 0x933ebd71, 0xa7d915e8, 0xb47b8d9f,
0xce1644da, 0xddb4dcad, 0xe9537434, 0xfaf1ec43,
0x1d88e6be, 0x0e2a7ec9, 0x3acdd650, 0x296f4e27,
0x53028762, 0x40a01f15, 0x7447b78c, 0x67e52ffb,
0xbf59d487, 0xacfb4cf0, 0x981ce469, 0x8bbe7c1e,
0xf1d3b55b, 0xe2712d2c, 0xd69685b5, 0xc5341dc2,
0x224d173f, 0x31ef8f48, 0x050827d1, 0x16aabfa6,
0x6cc776e3, 0x7f65ee94, 0x4b82460d, 0x5820de7a,
0xfbc3faf9, 0xe861628e, 0xdc86ca17, 0xcf245260,
0xb5499b25, 0xa6eb0352, 0x920cabcb, 0x81ae33bc,
0x66d73941, 0x7575a136, 0x419209af, 0x523091d8,
0x285d589d, 0x3bffc0ea, 0x0f186873, 0x1cbaf004,
0xc4060b78, 0xd7a4930f, 0xe3433b96, 0xf0e1a3e1,
0x8a8c6aa4, 0x992ef2d3, 0xadc95a4a, 0xbe6bc23d,
0x5912c8c0, 0x4ab050b7, 0x7e57f82e, 0x6df56059,
0x1798a91c, 0x043a316b, 0x30dd99f2, 0x237f0185,
0x844819fb, 0x97ea818c, 0xa30d2915, 0xb0afb162,
0xcac27827, 0xd960e050, 0xed8748c9, 0xfe25d0be,
0x195cda43, 0x0afe4234, 0x3e19eaad, 0x2dbb72da,
0x57d6bb9f, 0x447423e8, 0x70938b71, 0x63311306,
0xbb8de87a, 0xa82f700d, 0x9cc8d894, 0x8f6a40e3,
0xf50789a6, 0xe6a511d1, 0xd242b948, 0xc1e0213f,
0x26992bc2, 0x353bb3b5, 0x01dc1b2c, 0x127e835b,
0x68134a1e, 0x7bb1d269, 0x4f567af0, 0x5cf4e287,
0x04d43cfd, 0x1776a48a, 0x23910c13, 0x30339464,
0x4a5e5d21, 0x59fcc556, 0x6d1b6dcf, 0x7eb9f5b8,
0x99c0ff45, 0x8a626732, 0xbe85cfab, 0xad2757dc,
0xd74a9e99, 0xc4e806ee, 0xf00fae77, 0xe3ad3600,
0x3b11cd7c, 0x28b3550b, 0x1c54fd92, 0x0ff665e5,
0x759baca0, 0x663934d7, 0x52de9c4e, 0x417c0439,
0xa6050ec4, 0xb5a796b3, 0x81403e2a, 0x92e2a65d,
0xe88f6f18, 0xfb2df76f, 0xcfca5ff6, 0xdc68c781,
0x7b5fdfff, 0x68fd4788, 0x5c1aef11, 0x4fb87766,
0x35d5be23, 0x26772654, 0x12908ecd, 0x013216ba,
0xe64b1c47, 0xf5e98430, 0xc10e2ca9, 0xd2acb4de,
0xa8c17d9b, 0xbb63e5ec, 0x8f844d75, 0x9c26d502,
0x449a2e7e, 0x5738b609, 0x63df1e90, 0x707d86e7,
0x0a104fa2, 0x19b2d7d5, 0x2d557f4c, 0x3ef7e73b,
0xd98eedc6, 0xca2c75b1, 0xfecbdd28, 0xed69455f,
0x97048c1a, 0x84a6146d, 0xb041bcf4, 0xa3e32483
};
static const uint32_t table2_[256] = {
0x00000000, 0xa541927e, 0x4f6f520d, 0xea2ec073,
0x9edea41a, 0x3b9f3664, 0xd1b1f617, 0x74f06469,
0x38513ec5, 0x9d10acbb, 0x773e6cc8, 0xd27ffeb6,
0xa68f9adf, 0x03ce08a1, 0xe9e0c8d2, 0x4ca15aac,
0x70a27d8a, 0xd5e3eff4, 0x3fcd2f87, 0x9a8cbdf9,
0xee7cd990, 0x4b3d4bee, 0xa1138b9d, 0x045219e3,
0x48f3434f, 0xedb2d131, 0x079c1142, 0xa2dd833c,
0xd62de755, 0x736c752b, 0x9942b558, 0x3c032726,
0xe144fb14, 0x4405696a, 0xae2ba919, 0x0b6a3b67,
0x7f9a5f0e, 0xdadbcd70, 0x30f50d03, 0x95b49f7d,
0xd915c5d1, 0x7c5457af, 0x967a97dc, 0x333b05a2,
0x47cb61cb, 0xe28af3b5, 0x08a433c6, 0xade5a1b8,
0x91e6869e, 0x34a714e0, 0xde89d493, 0x7bc846ed,
0x0f382284, 0xaa79b0fa, 0x40577089, 0xe516e2f7,
0xa9b7b85b, 0x0cf62a25, 0xe6d8ea56, 0x43997828,
0x37691c41, 0x92288e3f, 0x78064e4c, 0xdd47dc32,
0xc76580d9, 0x622412a7, 0x880ad2d4, 0x2d4b40aa,
0x59bb24c3, 0xfcfab6bd, 0x16d476ce, 0xb395e4b0,
0xff34be1c, 0x5a752c62, 0xb05bec11, 0x151a7e6f,
0x61ea1a06, 0xc4ab8878, 0x2e85480b, 0x8bc4da75,
0xb7c7fd53, 0x12866f2d, 0xf8a8af5e, 0x5de93d20,
0x29195949, 0x8c58cb37, 0x66760b44, 0xc337993a,
0x8f96c396, 0x2ad751e8, 0xc0f9919b, 0x65b803e5,
0x1148678c, 0xb409f5f2, 0x5e273581, 0xfb66a7ff,
0x26217bcd, 0x8360e9b3, 0x694e29c0, 0xcc0fbbbe,
0xb8ffdfd7, 0x1dbe4da9, 0xf7908dda, 0x52d11fa4,
0x1e704508, 0xbb31d776, 0x511f1705, 0xf45e857b,
0x80aee112, 0x25ef736c, 0xcfc1b31f, 0x6a802161,
0x56830647, 0xf3c29439, 0x19ec544a, 0xbcadc634,
0xc85da25d, 0x6d1c3023, 0x8732f050, 0x2273622e,
0x6ed23882, 0xcb93aafc, 0x21bd6a8f, 0x84fcf8f1,
0xf00c9c98, 0x554d0ee6, 0xbf63ce95, 0x1a225ceb,
0x8b277743, 0x2e66e53d, 0xc448254e, 0x6109b730,
0x15f9d359, 0xb0b84127, 0x5a968154, 0xffd7132a,
0xb3764986, 0x1637dbf8, 0xfc191b8b, 0x595889f5,
0x2da8ed9c, 0x88e97fe2, 0x62c7bf91, 0xc7862def,
0xfb850ac9, 0x5ec498b7, 0xb4ea58c4, 0x11abcaba,
0x655baed3, 0xc01a3cad, 0x2a34fcde, 0x8f756ea0,
0xc3d4340c, 0x6695a672, 0x8cbb6601, 0x29faf47f,
0x5d0a9016, 0xf84b0268, 0x1265c21b, 0xb7245065,
0x6a638c57, 0xcf221e29, 0x250cde5a, 0x804d4c24,
0xf4bd284d, 0x51fcba33, 0xbbd27a40, 0x1e93e83e,
0x5232b292, 0xf77320ec, 0x1d5de09f, 0xb81c72e1,
0xccec1688, 0x69ad84f6, 0x83834485, 0x26c2d6fb,
0x1ac1f1dd, 0xbf8063a3, 0x55aea3d0, 0xf0ef31ae,
0x841f55c7, 0x215ec7b9, 0xcb7007ca, 0x6e3195b4,
0x2290cf18, 0x87d15d66, 0x6dff9d15, 0xc8be0f6b,
0xbc4e6b02, 0x190ff97c, 0xf321390f, 0x5660ab71,
0x4c42f79a, 0xe90365e4, 0x032da597, 0xa66c37e9,
0xd29c5380, 0x77ddc1fe, 0x9df3018d, 0x38b293f3,
0x7413c95f, 0xd1525b21, 0x3b7c9b52, 0x9e3d092c,
0xeacd6d45, 0x4f8cff3b, 0xa5a23f48, 0x00e3ad36,
0x3ce08a10, 0x99a1186e, 0x738fd81d, 0xd6ce4a63,
0xa23e2e0a, 0x077fbc74, 0xed517c07, 0x4810ee79,
0x04b1b4d5, 0xa1f026ab, 0x4bdee6d8, 0xee9f74a6,
0x9a6f10cf, 0x3f2e82b1, 0xd50042c2, 0x7041d0bc,
0xad060c8e, 0x08479ef0, 0xe2695e83, 0x4728ccfd,
0x33d8a894, 0x96993aea, 0x7cb7fa99, 0xd9f668e7,
0x9557324b, 0x3016a035, 0xda386046, 0x7f79f238,
0x0b899651, 0xaec8042f, 0x44e6c45c, 0xe1a75622,
0xdda47104, 0x78e5e37a, 0x92cb2309, 0x378ab177,
0x437ad51e, 0xe63b4760, 0x0c158713, 0xa954156d,
0xe5f54fc1, 0x40b4ddbf, 0xaa9a1dcc, 0x0fdb8fb2,
0x7b2bebdb, 0xde6a79a5, 0x3444b9d6, 0x91052ba8
};
static const uint32_t table3_[256] = {
0x00000000, 0xdd45aab8, 0xbf672381, 0x62228939,
0x7b2231f3, 0xa6679b4b, 0xc4451272, 0x1900b8ca,
0xf64463e6, 0x2b01c95e, 0x49234067, 0x9466eadf,
0x8d665215, 0x5023f8ad, 0x32017194, 0xef44db2c,
0xe964b13d, 0x34211b85, 0x560392bc, 0x8b463804,
0x924680ce, 0x4f032a76, 0x2d21a34f, 0xf06409f7,
0x1f20d2db, 0xc2657863, 0xa047f15a, 0x7d025be2,
0x6402e328, 0xb9474990, 0xdb65c0a9, 0x06206a11,
0xd725148b, 0x0a60be33, 0x6842370a, 0xb5079db2,
0xac072578, 0x71428fc0, 0x136006f9, 0xce25ac41,
0x2161776d, 0xfc24ddd5, 0x9e0654ec, 0x4343fe54,
0x5a43469e, 0x8706ec26, 0xe524651f, 0x3861cfa7,
0x3e41a5b6, 0xe3040f0e, 0x81268637, 0x5c632c8f,
0x45639445, 0x98263efd, 0xfa04b7c4, 0x27411d7c,
0xc805c650, 0x15406ce8, 0x7762e5d1, 0xaa274f69,
0xb327f7a3, 0x6e625d1b, 0x0c40d422, 0xd1057e9a,
0xaba65fe7, 0x76e3f55f, 0x14c17c66, 0xc984d6de,
0xd0846e14, 0x0dc1c4ac, 0x6fe34d95, 0xb2a6e72d,
0x5de23c01, 0x80a796b9, 0xe2851f80, 0x3fc0b538,
0x26c00df2, 0xfb85a74a, 0x99a72e73, 0x44e284cb,
0x42c2eeda, 0x9f874462, 0xfda5cd5b, 0x20e067e3,
0x39e0df29, 0xe4a57591, 0x8687fca8, 0x5bc25610,
0xb4868d3c, 0x69c32784, 0x0be1aebd, 0xd6a40405,
0xcfa4bccf, 0x12e11677, 0x70c39f4e, 0xad8635f6,
0x7c834b6c, 0xa1c6e1d4, 0xc3e468ed, 0x1ea1c255,
0x07a17a9f, 0xdae4d027, 0xb8c6591e, 0x6583f3a6,
0x8ac7288a, 0x57828232, 0x35a00b0b, 0xe8e5a1b3,
0xf1e51979, 0x2ca0b3c1, 0x4e823af8, 0x93c79040,
0x95e7fa51, 0x48a250e9, 0x2a80d9d0, 0xf7c57368,
0xeec5cba2, 0x3380611a, 0x51a2e823, 0x8ce7429b,
0x63a399b7, 0xbee6330f, 0xdcc4ba36, 0x0181108e,
0x1881a844, 0xc5c402fc, 0xa7e68bc5, 0x7aa3217d,
0x52a0c93f, 0x8fe56387, 0xedc7eabe, 0x30824006,
0x2982f8cc, 0xf4c75274, 0x96e5db4d, 0x4ba071f5,
0xa4e4aad9, 0x79a10061, 0x1b838958, 0xc6c623e0,
0xdfc69b2a, 0x02833192, 0x60a1b8ab, 0xbde41213,
0xbbc47802, 0x6681d2ba, 0x04a35b83, 0xd9e6f13b,
0xc0e649f1, 0x1da3e349, 0x7f816a70, 0xa2c4c0c8,
0x4d801be4, 0x90c5b15c, 0xf2e73865, 0x2fa292dd,
0x36a22a17, 0xebe780af, 0x89c50996, 0x5480a32e,
0x8585ddb4, 0x58c0770c, 0x3ae2fe35, 0xe7a7548d,
0xfea7ec47, 0x23e246ff, 0x41c0cfc6, 0x9c85657e,
0x73c1be52, 0xae8414ea, 0xcca69dd3, 0x11e3376b,
0x08e38fa1, 0xd5a62519, 0xb784ac20, 0x6ac10698,
0x6ce16c89, 0xb1a4c631, 0xd3864f08, 0x0ec3e5b0,
0x17c35d7a, 0xca86f7c2, 0xa8a47efb, 0x75e1d443,
0x9aa50f6f, 0x47e0a5d7, 0x25c22cee, 0xf8878656,
0xe1873e9c, 0x3cc29424, 0x5ee01d1d, 0x83a5b7a5,
0xf90696d8, 0x24433c60, 0x4661b559, 0x9b241fe1,
0x8224a72b, 0x5f610d93, 0x3d4384aa, 0xe0062e12,
0x0f42f53e, 0xd2075f86, 0xb025d6bf, 0x6d607c07,
0x7460c4cd, 0xa9256e75, 0xcb07e74c, 0x16424df4,
0x106227e5, 0xcd278d5d, 0xaf050464, 0x7240aedc,
0x6b401616, 0xb605bcae, 0xd4273597, 0x09629f2f,
0xe6264403, 0x3b63eebb, 0x59416782, 0x8404cd3a,
0x9d0475f0, 0x4041df48, 0x22635671, 0xff26fcc9,
0x2e238253, 0xf36628eb, 0x9144a1d2, 0x4c010b6a,
0x5501b3a0, 0x88441918, 0xea669021, 0x37233a99,
0xd867e1b5, 0x05224b0d, 0x6700c234, 0xba45688c,
0xa345d046, 0x7e007afe, 0x1c22f3c7, 0xc167597f,
0xc747336e, 0x1a0299d6, 0x782010ef, 0xa565ba57,
0xbc65029d, 0x6120a825, 0x0302211c, 0xde478ba4,
0x31035088, 0xec46fa30, 0x8e647309, 0x5321d9b1,
0x4a21617b, 0x9764cbc3, 0xf54642fa, 0x2803e842
};
// Used to fetch a naturally-aligned 32-bit word in little endian byte-order
static inline uint32_t LE_LOAD32(const uint8_t *p) {
return DecodeFixed32(reinterpret_cast<const char*>(p));
}
#if defined(HAVE_SSE42) && (defined(__LP64__) || defined(_WIN64))
static inline uint64_t LE_LOAD64(const uint8_t *p) {
return DecodeFixed64(reinterpret_cast<const char*>(p));
}
#endif
static inline void Slow_CRC32(uint64_t* l, uint8_t const **p) {
uint32_t c = static_cast<uint32_t>(*l ^ LE_LOAD32(*p));
*p += 4;
*l = table3_[c & 0xff] ^
table2_[(c >> 8) & 0xff] ^
table1_[(c >> 16) & 0xff] ^
table0_[c >> 24];
// DO it twice.
c = static_cast<uint32_t>(*l ^ LE_LOAD32(*p));
*p += 4;
*l = table3_[c & 0xff] ^
table2_[(c >> 8) & 0xff] ^
table1_[(c >> 16) & 0xff] ^
table0_[c >> 24];
}
#if (!(defined(HAVE_POWER8) && defined(HAS_ALTIVEC))) && \
(!defined(HAVE_ARM64_CRC)) || \
defined(NO_THREEWAY_CRC32C)
static inline void Fast_CRC32(uint64_t* l, uint8_t const **p) {
#ifndef HAVE_SSE42
Slow_CRC32(l, p);
#elif defined(__LP64__) || defined(_WIN64)
*l = _mm_crc32_u64(*l, LE_LOAD64(*p));
*p += 8;
#else
*l = _mm_crc32_u32(static_cast<unsigned int>(*l), LE_LOAD32(*p));
*p += 4;
*l = _mm_crc32_u32(static_cast<unsigned int>(*l), LE_LOAD32(*p));
*p += 4;
#endif
}
#endif
template<void (*CRC32)(uint64_t*, uint8_t const**)>
uint32_t ExtendImpl(uint32_t crc, const char* buf, size_t size) {
const uint8_t *p = reinterpret_cast<const uint8_t *>(buf);
const uint8_t *e = p + size;
uint64_t l = crc ^ 0xffffffffu;
// Align n to (1 << m) byte boundary
#define ALIGN(n, m) ((n + ((1 << m) - 1)) & ~((1 << m) - 1))
#define STEP1 do { \
int c = (l & 0xff) ^ *p++; \
l = table0_[c] ^ (l >> 8); \
} while (0)
// Point x at first 16-byte aligned byte in string. This might be
// just past the end of the string.
const uintptr_t pval = reinterpret_cast<uintptr_t>(p);
const uint8_t* x = reinterpret_cast<const uint8_t*>(ALIGN(pval, 4));
if (x <= e) {
// Process bytes until finished or p is 16-byte aligned
while (p != x) {
STEP1;
}
}
// Process bytes 16 at a time
while ((e-p) >= 16) {
CRC32(&l, &p);
CRC32(&l, &p);
}
// Process bytes 8 at a time
while ((e-p) >= 8) {
CRC32(&l, &p);
}
// Process the last few bytes
while (p != e) {
STEP1;
}
#undef STEP1
#undef ALIGN
return static_cast<uint32_t>(l ^ 0xffffffffu);
}
// Detect if ARM64 CRC or not.
#ifndef HAVE_ARM64_CRC
// Detect if SS42 or not.
#ifndef HAVE_POWER8
static bool isSSE42() {
#ifndef HAVE_SSE42
return false;
#elif defined(__GNUC__) && defined(__x86_64__) && !defined(IOS_CROSS_COMPILE)
uint32_t c_;
__asm__("cpuid" : "=c"(c_) : "a"(1) : "ebx", "edx");
return c_ & (1U << 20); // copied from CpuId.h in Folly. Test SSE42
#elif defined(_WIN64)
int info[4];
__cpuidex(info, 0x00000001, 0);
return (info[2] & ((int)1 << 20)) != 0;
#else
return false;
#endif
}
static bool isPCLMULQDQ() {
#ifndef HAVE_SSE42
// in build_detect_platform we set this macro when both SSE42 and PCLMULQDQ are
// supported by compiler
return false;
#elif defined(__GNUC__) && defined(__x86_64__) && !defined(IOS_CROSS_COMPILE)
uint32_t c_;
__asm__("cpuid" : "=c"(c_) : "a"(1) : "ebx", "edx");
return c_ & (1U << 1); // PCLMULQDQ is in bit 1 (not bit 0)
#elif defined(_WIN64)
int info[4];
__cpuidex(info, 0x00000001, 0);
return (info[2] & ((int)1 << 1)) != 0;
#else
return false;
#endif
}
#endif // HAVE_POWER8
#endif // HAVE_ARM64_CRC
typedef uint32_t (*Function)(uint32_t, const char*, size_t);
#if defined(HAVE_POWER8) && defined(HAS_ALTIVEC)
uint32_t ExtendPPCImpl(uint32_t crc, const char *buf, size_t size) {
return crc32c_ppc(crc, (const unsigned char *)buf, size);
}
#if __linux__
static int arch_ppc_probe(void) {
arch_ppc_crc32 = 0;
#if defined(__powerpc64__) && defined(ROCKSDB_AUXV_GETAUXVAL_PRESENT)
if (getauxval(AT_HWCAP2) & PPC_FEATURE2_VEC_CRYPTO) arch_ppc_crc32 = 1;
#endif /* __powerpc64__ */
return arch_ppc_crc32;
}
#elif __FreeBSD__
static int arch_ppc_probe(void) {
unsigned long cpufeatures;
arch_ppc_crc32 = 0;
#if defined(__powerpc64__)
elf_aux_info(AT_HWCAP2, &cpufeatures, sizeof(cpufeatures));
if (cpufeatures & PPC_FEATURE2_HAS_VEC_CRYPTO) arch_ppc_crc32 = 1;
#endif /* __powerpc64__ */
return arch_ppc_crc32;
}
#endif // __linux__
static bool isAltiVec() {
if (arch_ppc_probe()) {
return true;
} else {
return false;
}
}
#endif
#if defined(HAVE_ARM64_CRC)
uint32_t ExtendARMImpl(uint32_t crc, const char *buf, size_t size) {
return crc32c_arm64(crc, (const unsigned char *)buf, size);
}
#endif
std::string IsFastCrc32Supported() {
bool has_fast_crc = false;
std::string fast_zero_msg;
std::string arch;
#ifdef HAVE_POWER8
#ifdef HAS_ALTIVEC
if (arch_ppc_probe()) {
has_fast_crc = true;
arch = "PPC";
}
#else
has_fast_crc = false;
arch = "PPC";
#endif
#elif defined(HAVE_ARM64_CRC)
if (crc32c_runtime_check()) {
has_fast_crc = true;
arch = "Arm64";
pmull_runtime_flag = crc32c_pmull_runtime_check();
} else {
has_fast_crc = false;
arch = "Arm64";
}
#else
has_fast_crc = isSSE42();
arch = "x86";
#endif
if (has_fast_crc) {
fast_zero_msg.append("Supported on " + arch);
}
else {
fast_zero_msg.append("Not supported on " + arch);
}
return fast_zero_msg;
}
/*
* Copyright 2016 Ferry Toth, Exalon Delft BV, The Netherlands
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the author be held liable for any damages
* arising from the use of this software.
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
* Ferry Toth
* ftoth@exalondelft.nl
*
* https://github.com/htot/crc32c
*
* Modified by Facebook
*
* Original intel whitepaper:
* "Fast CRC Computation for iSCSI Polynomial Using CRC32 Instruction"
* https://www.intel.com/content/dam/www/public/us/en/documents/white-papers/crc-iscsi-polynomial-crc32-instruction-paper.pdf
*
* This version is from the folly library, created by Dave Watson <davejwatson@fb.com>
*
*/
#if defined HAVE_SSE42 && defined HAVE_PCLMUL
#define CRCtriplet(crc, buf, offset) \
crc##0 = _mm_crc32_u64(crc##0, *(buf##0 + offset)); \
crc##1 = _mm_crc32_u64(crc##1, *(buf##1 + offset)); \
crc##2 = _mm_crc32_u64(crc##2, *(buf##2 + offset));
#define CRCduplet(crc, buf, offset) \
crc##0 = _mm_crc32_u64(crc##0, *(buf##0 + offset)); \
crc##1 = _mm_crc32_u64(crc##1, *(buf##1 + offset));
#define CRCsinglet(crc, buf, offset) \
crc = _mm_crc32_u64(crc, *(uint64_t*)(buf + offset));
// Numbers taken directly from intel whitepaper.
// clang-format off
const uint64_t clmul_constants[] = {
0x14cd00bd6, 0x105ec76f0, 0x0ba4fc28e, 0x14cd00bd6,
0x1d82c63da, 0x0f20c0dfe, 0x09e4addf8, 0x0ba4fc28e,
0x039d3b296, 0x1384aa63a, 0x102f9b8a2, 0x1d82c63da,
0x14237f5e6, 0x01c291d04, 0x00d3b6092, 0x09e4addf8,
0x0c96cfdc0, 0x0740eef02, 0x18266e456, 0x039d3b296,
0x0daece73e, 0x0083a6eec, 0x0ab7aff2a, 0x102f9b8a2,
0x1248ea574, 0x1c1733996, 0x083348832, 0x14237f5e6,
0x12c743124, 0x02ad91c30, 0x0b9e02b86, 0x00d3b6092,
0x018b33a4e, 0x06992cea2, 0x1b331e26a, 0x0c96cfdc0,
0x17d35ba46, 0x07e908048, 0x1bf2e8b8a, 0x18266e456,
0x1a3e0968a, 0x11ed1f9d8, 0x0ce7f39f4, 0x0daece73e,
0x061d82e56, 0x0f1d0f55e, 0x0d270f1a2, 0x0ab7aff2a,
0x1c3f5f66c, 0x0a87ab8a8, 0x12ed0daac, 0x1248ea574,
0x065863b64, 0x08462d800, 0x11eef4f8e, 0x083348832,
0x1ee54f54c, 0x071d111a8, 0x0b3e32c28, 0x12c743124,
0x0064f7f26, 0x0ffd852c6, 0x0dd7e3b0c, 0x0b9e02b86,
0x0f285651c, 0x0dcb17aa4, 0x010746f3c, 0x018b33a4e,
0x1c24afea4, 0x0f37c5aee, 0x0271d9844, 0x1b331e26a,
0x08e766a0c, 0x06051d5a2, 0x093a5f730, 0x17d35ba46,
0x06cb08e5c, 0x11d5ca20e, 0x06b749fb2, 0x1bf2e8b8a,
0x1167f94f2, 0x021f3d99c, 0x0cec3662e, 0x1a3e0968a,
0x19329634a, 0x08f158014, 0x0e6fc4e6a, 0x0ce7f39f4,
0x08227bb8a, 0x1a5e82106, 0x0b0cd4768, 0x061d82e56,
0x13c2b89c4, 0x188815ab2, 0x0d7a4825c, 0x0d270f1a2,
0x10f5ff2ba, 0x105405f3e, 0x00167d312, 0x1c3f5f66c,
0x0f6076544, 0x0e9adf796, 0x026f6a60a, 0x12ed0daac,
0x1a2adb74e, 0x096638b34, 0x19d34af3a, 0x065863b64,
0x049c3cc9c, 0x1e50585a0, 0x068bce87a, 0x11eef4f8e,
0x1524fa6c6, 0x19f1c69dc, 0x16cba8aca, 0x1ee54f54c,
0x042d98888, 0x12913343e, 0x1329d9f7e, 0x0b3e32c28,
0x1b1c69528, 0x088f25a3a, 0x02178513a, 0x0064f7f26,
0x0e0ac139e, 0x04e36f0b0, 0x0170076fa, 0x0dd7e3b0c,
0x141a1a2e2, 0x0bd6f81f8, 0x16ad828b4, 0x0f285651c,
0x041d17b64, 0x19425cbba, 0x1fae1cc66, 0x010746f3c,
0x1a75b4b00, 0x18db37e8a, 0x0f872e54c, 0x1c24afea4,
0x01e41e9fc, 0x04c144932, 0x086d8e4d2, 0x0271d9844,
0x160f7af7a, 0x052148f02, 0x05bb8f1bc, 0x08e766a0c,
0x0a90fd27a, 0x0a3c6f37a, 0x0b3af077a, 0x093a5f730,
0x04984d782, 0x1d22c238e, 0x0ca6ef3ac, 0x06cb08e5c,
0x0234e0b26, 0x063ded06a, 0x1d88abd4a, 0x06b749fb2,
0x04597456a, 0x04d56973c, 0x0e9e28eb4, 0x1167f94f2,
0x07b3ff57a, 0x19385bf2e, 0x0c9c8b782, 0x0cec3662e,
0x13a9cba9e, 0x0e417f38a, 0x093e106a4, 0x19329634a,
0x167001a9c, 0x14e727980, 0x1ddffc5d4, 0x0e6fc4e6a,
0x00df04680, 0x0d104b8fc, 0x02342001e, 0x08227bb8a,
0x00a2a8d7e, 0x05b397730, 0x168763fa6, 0x0b0cd4768,
0x1ed5a407a, 0x0e78eb416, 0x0d2c3ed1a, 0x13c2b89c4,
0x0995a5724, 0x1641378f0, 0x19b1afbc4, 0x0d7a4825c,
0x109ffedc0, 0x08d96551c, 0x0f2271e60, 0x10f5ff2ba,
0x00b0bf8ca, 0x00bf80dd2, 0x123888b7a, 0x00167d312,
0x1e888f7dc, 0x18dcddd1c, 0x002ee03b2, 0x0f6076544,
0x183e8d8fe, 0x06a45d2b2, 0x133d7a042, 0x026f6a60a,
0x116b0f50c, 0x1dd3e10e8, 0x05fabe670, 0x1a2adb74e,
0x130004488, 0x0de87806c, 0x000bcf5f6, 0x19d34af3a,
0x18f0c7078, 0x014338754, 0x017f27698, 0x049c3cc9c,
0x058ca5f00, 0x15e3e77ee, 0x1af900c24, 0x068bce87a,
0x0b5cfca28, 0x0dd07448e, 0x0ded288f8, 0x1524fa6c6,
0x059f229bc, 0x1d8048348, 0x06d390dec, 0x16cba8aca,
0x037170390, 0x0a3e3e02c, 0x06353c1cc, 0x042d98888,
0x0c4584f5c, 0x0d73c7bea, 0x1f16a3418, 0x1329d9f7e,
0x0531377e2, 0x185137662, 0x1d8d9ca7c, 0x1b1c69528,
0x0b25b29f2, 0x18a08b5bc, 0x19fb2a8b0, 0x02178513a,
0x1a08fe6ac, 0x1da758ae0, 0x045cddf4e, 0x0e0ac139e,
0x1a91647f2, 0x169cf9eb0, 0x1a0f717c4, 0x0170076fa,
};
// Compute the crc32c value for buffer smaller than 8
#ifdef ROCKSDB_UBSAN_RUN
#if defined(__clang__)
__attribute__((__no_sanitize__("alignment")))
#elif defined(__GNUC__)
__attribute__((__no_sanitize_undefined__))
#endif
#endif
inline void align_to_8(
size_t len,
uint64_t& crc0, // crc so far, updated on return
const unsigned char*& next) { // next data pointer, updated on return
uint32_t crc32bit = static_cast<uint32_t>(crc0);
if (len & 0x04) {
crc32bit = _mm_crc32_u32(crc32bit, *(uint32_t*)next);
next += sizeof(uint32_t);
}
if (len & 0x02) {
crc32bit = _mm_crc32_u16(crc32bit, *(uint16_t*)next);
next += sizeof(uint16_t);
}
if (len & 0x01) {
crc32bit = _mm_crc32_u8(crc32bit, *(next));
next++;
}
crc0 = crc32bit;
}
//
// CombineCRC performs pclmulqdq multiplication of 2 partial CRC's and a well
// chosen constant and xor's these with the remaining CRC.
//
inline uint64_t CombineCRC(
size_t block_size,
uint64_t crc0,
uint64_t crc1,
uint64_t crc2,
const uint64_t* next2) {
const auto multiplier =
*(reinterpret_cast<const __m128i*>(clmul_constants) + block_size - 1);
const auto crc0_xmm = _mm_set_epi64x(0, crc0);
const auto res0 = _mm_clmulepi64_si128(crc0_xmm, multiplier, 0x00);
const auto crc1_xmm = _mm_set_epi64x(0, crc1);
const auto res1 = _mm_clmulepi64_si128(crc1_xmm, multiplier, 0x10);
const auto res = _mm_xor_si128(res0, res1);
crc0 = _mm_cvtsi128_si64(res);
crc0 = crc0 ^ *((uint64_t*)next2 - 1);
crc2 = _mm_crc32_u64(crc2, crc0);
return crc2;
}
// Compute CRC-32C using the Intel hardware instruction.
#ifdef ROCKSDB_UBSAN_RUN
#if defined(__clang__)
__attribute__((__no_sanitize__("alignment")))
#elif defined(__GNUC__)
__attribute__((__no_sanitize_undefined__))
#endif
#endif
uint32_t crc32c_3way(uint32_t crc, const char* buf, size_t len) {
const unsigned char* next = (const unsigned char*)buf;
uint64_t count;
uint64_t crc0, crc1, crc2;
crc0 = crc ^ 0xffffffffu;
if (len >= 8) {
// if len > 216 then align and use triplets
if (len > 216) {
{
// Work on the bytes (< 8) before the first 8-byte alignment addr starts
uint64_t align_bytes = (8 - (uintptr_t)next) & 7;
len -= align_bytes;
align_to_8(align_bytes, crc0, next);
}
// Now work on the remaining blocks
count = len / 24; // number of triplets
len %= 24; // bytes remaining
uint64_t n = count >> 7; // #blocks = first block + full blocks
uint64_t block_size = count & 127;
if (block_size == 0) {
block_size = 128;
} else {
n++;
}
// points to the first byte of the next block
const uint64_t* next0 = (uint64_t*)next + block_size;
const uint64_t* next1 = next0 + block_size;
const uint64_t* next2 = next1 + block_size;
crc1 = crc2 = 0;
// Use Duff's device, a for() loop inside a switch()
// statement. This needs to execute at least once, round len
// down to nearest triplet multiple
switch (block_size) {
case 128:
do {
// jumps here for a full block of len 128
CRCtriplet(crc, next, -128);
FALLTHROUGH_INTENDED;
case 127:
// jumps here or below for the first block smaller
CRCtriplet(crc, next, -127);
FALLTHROUGH_INTENDED;
case 126:
CRCtriplet(crc, next, -126); // than 128
FALLTHROUGH_INTENDED;
case 125:
CRCtriplet(crc, next, -125);
FALLTHROUGH_INTENDED;
case 124:
CRCtriplet(crc, next, -124);
FALLTHROUGH_INTENDED;
case 123:
CRCtriplet(crc, next, -123);
FALLTHROUGH_INTENDED;
case 122:
CRCtriplet(crc, next, -122);
FALLTHROUGH_INTENDED;
case 121:
CRCtriplet(crc, next, -121);
FALLTHROUGH_INTENDED;
case 120:
CRCtriplet(crc, next, -120);
FALLTHROUGH_INTENDED;
case 119:
CRCtriplet(crc, next, -119);
FALLTHROUGH_INTENDED;
case 118:
CRCtriplet(crc, next, -118);
FALLTHROUGH_INTENDED;
case 117:
CRCtriplet(crc, next, -117);
FALLTHROUGH_INTENDED;
case 116:
CRCtriplet(crc, next, -116);
FALLTHROUGH_INTENDED;
case 115:
CRCtriplet(crc, next, -115);
FALLTHROUGH_INTENDED;
case 114:
CRCtriplet(crc, next, -114);
FALLTHROUGH_INTENDED;
case 113:
CRCtriplet(crc, next, -113);
FALLTHROUGH_INTENDED;
case 112:
CRCtriplet(crc, next, -112);
FALLTHROUGH_INTENDED;
case 111:
CRCtriplet(crc, next, -111);
FALLTHROUGH_INTENDED;
case 110:
CRCtriplet(crc, next, -110);
FALLTHROUGH_INTENDED;
case 109:
CRCtriplet(crc, next, -109);
FALLTHROUGH_INTENDED;
case 108:
CRCtriplet(crc, next, -108);
FALLTHROUGH_INTENDED;
case 107:
CRCtriplet(crc, next, -107);
FALLTHROUGH_INTENDED;
case 106:
CRCtriplet(crc, next, -106);
FALLTHROUGH_INTENDED;
case 105:
CRCtriplet(crc, next, -105);
FALLTHROUGH_INTENDED;
case 104:
CRCtriplet(crc, next, -104);
FALLTHROUGH_INTENDED;
case 103:
CRCtriplet(crc, next, -103);
FALLTHROUGH_INTENDED;
case 102:
CRCtriplet(crc, next, -102);
FALLTHROUGH_INTENDED;
case 101:
CRCtriplet(crc, next, -101);
FALLTHROUGH_INTENDED;
case 100:
CRCtriplet(crc, next, -100);
FALLTHROUGH_INTENDED;
case 99:
CRCtriplet(crc, next, -99);
FALLTHROUGH_INTENDED;
case 98:
CRCtriplet(crc, next, -98);
FALLTHROUGH_INTENDED;
case 97:
CRCtriplet(crc, next, -97);
FALLTHROUGH_INTENDED;
case 96:
CRCtriplet(crc, next, -96);
FALLTHROUGH_INTENDED;
case 95:
CRCtriplet(crc, next, -95);
FALLTHROUGH_INTENDED;
case 94:
CRCtriplet(crc, next, -94);
FALLTHROUGH_INTENDED;
case 93:
CRCtriplet(crc, next, -93);
FALLTHROUGH_INTENDED;
case 92:
CRCtriplet(crc, next, -92);
FALLTHROUGH_INTENDED;
case 91:
CRCtriplet(crc, next, -91);
FALLTHROUGH_INTENDED;
case 90:
CRCtriplet(crc, next, -90);
FALLTHROUGH_INTENDED;
case 89:
CRCtriplet(crc, next, -89);
FALLTHROUGH_INTENDED;
case 88:
CRCtriplet(crc, next, -88);
FALLTHROUGH_INTENDED;
case 87:
CRCtriplet(crc, next, -87);
FALLTHROUGH_INTENDED;
case 86:
CRCtriplet(crc, next, -86);
FALLTHROUGH_INTENDED;
case 85:
CRCtriplet(crc, next, -85);
FALLTHROUGH_INTENDED;
case 84:
CRCtriplet(crc, next, -84);
FALLTHROUGH_INTENDED;
case 83:
CRCtriplet(crc, next, -83);
FALLTHROUGH_INTENDED;
case 82:
CRCtriplet(crc, next, -82);
FALLTHROUGH_INTENDED;
case 81:
CRCtriplet(crc, next, -81);
FALLTHROUGH_INTENDED;
case 80:
CRCtriplet(crc, next, -80);
FALLTHROUGH_INTENDED;
case 79:
CRCtriplet(crc, next, -79);
FALLTHROUGH_INTENDED;
case 78:
CRCtriplet(crc, next, -78);
FALLTHROUGH_INTENDED;
case 77:
CRCtriplet(crc, next, -77);
FALLTHROUGH_INTENDED;
case 76:
CRCtriplet(crc, next, -76);
FALLTHROUGH_INTENDED;
case 75:
CRCtriplet(crc, next, -75);
FALLTHROUGH_INTENDED;
case 74:
CRCtriplet(crc, next, -74);
FALLTHROUGH_INTENDED;
case 73:
CRCtriplet(crc, next, -73);
FALLTHROUGH_INTENDED;
case 72:
CRCtriplet(crc, next, -72);
FALLTHROUGH_INTENDED;
case 71:
CRCtriplet(crc, next, -71);
FALLTHROUGH_INTENDED;
case 70:
CRCtriplet(crc, next, -70);
FALLTHROUGH_INTENDED;
case 69:
CRCtriplet(crc, next, -69);
FALLTHROUGH_INTENDED;
case 68:
CRCtriplet(crc, next, -68);
FALLTHROUGH_INTENDED;
case 67:
CRCtriplet(crc, next, -67);
FALLTHROUGH_INTENDED;
case 66:
CRCtriplet(crc, next, -66);
FALLTHROUGH_INTENDED;
case 65:
CRCtriplet(crc, next, -65);
FALLTHROUGH_INTENDED;
case 64:
CRCtriplet(crc, next, -64);
FALLTHROUGH_INTENDED;
case 63:
CRCtriplet(crc, next, -63);
FALLTHROUGH_INTENDED;
case 62:
CRCtriplet(crc, next, -62);
FALLTHROUGH_INTENDED;
case 61:
CRCtriplet(crc, next, -61);
FALLTHROUGH_INTENDED;
case 60:
CRCtriplet(crc, next, -60);
FALLTHROUGH_INTENDED;
case 59:
CRCtriplet(crc, next, -59);
FALLTHROUGH_INTENDED;
case 58:
CRCtriplet(crc, next, -58);
FALLTHROUGH_INTENDED;
case 57:
CRCtriplet(crc, next, -57);
FALLTHROUGH_INTENDED;
case 56:
CRCtriplet(crc, next, -56);
FALLTHROUGH_INTENDED;
case 55:
CRCtriplet(crc, next, -55);
FALLTHROUGH_INTENDED;
case 54:
CRCtriplet(crc, next, -54);
FALLTHROUGH_INTENDED;
case 53:
CRCtriplet(crc, next, -53);
FALLTHROUGH_INTENDED;
case 52:
CRCtriplet(crc, next, -52);
FALLTHROUGH_INTENDED;
case 51:
CRCtriplet(crc, next, -51);
FALLTHROUGH_INTENDED;
case 50:
CRCtriplet(crc, next, -50);
FALLTHROUGH_INTENDED;
case 49:
CRCtriplet(crc, next, -49);
FALLTHROUGH_INTENDED;
case 48:
CRCtriplet(crc, next, -48);
FALLTHROUGH_INTENDED;
case 47:
CRCtriplet(crc, next, -47);
FALLTHROUGH_INTENDED;
case 46:
CRCtriplet(crc, next, -46);
FALLTHROUGH_INTENDED;
case 45:
CRCtriplet(crc, next, -45);
FALLTHROUGH_INTENDED;
case 44:
CRCtriplet(crc, next, -44);
FALLTHROUGH_INTENDED;
case 43:
CRCtriplet(crc, next, -43);
FALLTHROUGH_INTENDED;
case 42:
CRCtriplet(crc, next, -42);
FALLTHROUGH_INTENDED;
case 41:
CRCtriplet(crc, next, -41);
FALLTHROUGH_INTENDED;
case 40:
CRCtriplet(crc, next, -40);
FALLTHROUGH_INTENDED;
case 39:
CRCtriplet(crc, next, -39);
FALLTHROUGH_INTENDED;
case 38:
CRCtriplet(crc, next, -38);
FALLTHROUGH_INTENDED;
case 37:
CRCtriplet(crc, next, -37);
FALLTHROUGH_INTENDED;
case 36:
CRCtriplet(crc, next, -36);
FALLTHROUGH_INTENDED;
case 35:
CRCtriplet(crc, next, -35);
FALLTHROUGH_INTENDED;
case 34:
CRCtriplet(crc, next, -34);
FALLTHROUGH_INTENDED;
case 33:
CRCtriplet(crc, next, -33);
FALLTHROUGH_INTENDED;
case 32:
CRCtriplet(crc, next, -32);
FALLTHROUGH_INTENDED;
case 31:
CRCtriplet(crc, next, -31);
FALLTHROUGH_INTENDED;
case 30:
CRCtriplet(crc, next, -30);
FALLTHROUGH_INTENDED;
case 29:
CRCtriplet(crc, next, -29);
FALLTHROUGH_INTENDED;
case 28:
CRCtriplet(crc, next, -28);
FALLTHROUGH_INTENDED;
case 27:
CRCtriplet(crc, next, -27);
FALLTHROUGH_INTENDED;
case 26:
CRCtriplet(crc, next, -26);
FALLTHROUGH_INTENDED;
case 25:
CRCtriplet(crc, next, -25);
FALLTHROUGH_INTENDED;
case 24:
CRCtriplet(crc, next, -24);
FALLTHROUGH_INTENDED;
case 23:
CRCtriplet(crc, next, -23);
FALLTHROUGH_INTENDED;
case 22:
CRCtriplet(crc, next, -22);
FALLTHROUGH_INTENDED;
case 21:
CRCtriplet(crc, next, -21);
FALLTHROUGH_INTENDED;
case 20:
CRCtriplet(crc, next, -20);
FALLTHROUGH_INTENDED;
case 19:
CRCtriplet(crc, next, -19);
FALLTHROUGH_INTENDED;
case 18:
CRCtriplet(crc, next, -18);
FALLTHROUGH_INTENDED;
case 17:
CRCtriplet(crc, next, -17);
FALLTHROUGH_INTENDED;
case 16:
CRCtriplet(crc, next, -16);
FALLTHROUGH_INTENDED;
case 15:
CRCtriplet(crc, next, -15);
FALLTHROUGH_INTENDED;
case 14:
CRCtriplet(crc, next, -14);
FALLTHROUGH_INTENDED;
case 13:
CRCtriplet(crc, next, -13);
FALLTHROUGH_INTENDED;
case 12:
CRCtriplet(crc, next, -12);
FALLTHROUGH_INTENDED;
case 11:
CRCtriplet(crc, next, -11);
FALLTHROUGH_INTENDED;
case 10:
CRCtriplet(crc, next, -10);
FALLTHROUGH_INTENDED;
case 9:
CRCtriplet(crc, next, -9);
FALLTHROUGH_INTENDED;
case 8:
CRCtriplet(crc, next, -8);
FALLTHROUGH_INTENDED;
case 7:
CRCtriplet(crc, next, -7);
FALLTHROUGH_INTENDED;
case 6:
CRCtriplet(crc, next, -6);
FALLTHROUGH_INTENDED;
case 5:
CRCtriplet(crc, next, -5);
FALLTHROUGH_INTENDED;
case 4:
CRCtriplet(crc, next, -4);
FALLTHROUGH_INTENDED;
case 3:
CRCtriplet(crc, next, -3);
FALLTHROUGH_INTENDED;
case 2:
CRCtriplet(crc, next, -2);
FALLTHROUGH_INTENDED;
case 1:
CRCduplet(crc, next, -1); // the final triplet is actually only 2
//{ CombineCRC(); }
crc0 = CombineCRC(block_size, crc0, crc1, crc2, next2);
if (--n > 0) {
crc1 = crc2 = 0;
block_size = 128;
// points to the first byte of the next block
next0 = next2 + 128;
next1 = next0 + 128; // from here on all blocks are 128 long
next2 = next1 + 128;
}
FALLTHROUGH_INTENDED;
case 0:;
} while (n > 0);
}
next = (const unsigned char*)next2;
}
uint64_t count2 = len >> 3; // 216 of less bytes is 27 or less singlets
len = len & 7;
next += (count2 * 8);
switch (count2) {
case 27:
CRCsinglet(crc0, next, -27 * 8);
FALLTHROUGH_INTENDED;
case 26:
CRCsinglet(crc0, next, -26 * 8);
FALLTHROUGH_INTENDED;
case 25:
CRCsinglet(crc0, next, -25 * 8);
FALLTHROUGH_INTENDED;
case 24:
CRCsinglet(crc0, next, -24 * 8);
FALLTHROUGH_INTENDED;
case 23:
CRCsinglet(crc0, next, -23 * 8);
FALLTHROUGH_INTENDED;
case 22:
CRCsinglet(crc0, next, -22 * 8);
FALLTHROUGH_INTENDED;
case 21:
CRCsinglet(crc0, next, -21 * 8);
FALLTHROUGH_INTENDED;
case 20:
CRCsinglet(crc0, next, -20 * 8);
FALLTHROUGH_INTENDED;
case 19:
CRCsinglet(crc0, next, -19 * 8);
FALLTHROUGH_INTENDED;
case 18:
CRCsinglet(crc0, next, -18 * 8);
FALLTHROUGH_INTENDED;
case 17:
CRCsinglet(crc0, next, -17 * 8);
FALLTHROUGH_INTENDED;
case 16:
CRCsinglet(crc0, next, -16 * 8);
FALLTHROUGH_INTENDED;
case 15:
CRCsinglet(crc0, next, -15 * 8);
FALLTHROUGH_INTENDED;
case 14:
CRCsinglet(crc0, next, -14 * 8);
FALLTHROUGH_INTENDED;
case 13:
CRCsinglet(crc0, next, -13 * 8);
FALLTHROUGH_INTENDED;
case 12:
CRCsinglet(crc0, next, -12 * 8);
FALLTHROUGH_INTENDED;
case 11:
CRCsinglet(crc0, next, -11 * 8);
FALLTHROUGH_INTENDED;
case 10:
CRCsinglet(crc0, next, -10 * 8);
FALLTHROUGH_INTENDED;
case 9:
CRCsinglet(crc0, next, -9 * 8);
FALLTHROUGH_INTENDED;
case 8:
CRCsinglet(crc0, next, -8 * 8);
FALLTHROUGH_INTENDED;
case 7:
CRCsinglet(crc0, next, -7 * 8);
FALLTHROUGH_INTENDED;
case 6:
CRCsinglet(crc0, next, -6 * 8);
FALLTHROUGH_INTENDED;
case 5:
CRCsinglet(crc0, next, -5 * 8);
FALLTHROUGH_INTENDED;
case 4:
CRCsinglet(crc0, next, -4 * 8);
FALLTHROUGH_INTENDED;
case 3:
CRCsinglet(crc0, next, -3 * 8);
FALLTHROUGH_INTENDED;
case 2:
CRCsinglet(crc0, next, -2 * 8);
FALLTHROUGH_INTENDED;
case 1:
CRCsinglet(crc0, next, -1 * 8);
FALLTHROUGH_INTENDED;
case 0:;
}
}
{
align_to_8(len, crc0, next);
return (uint32_t)crc0 ^ 0xffffffffu;
}
}
#endif //HAVE_SSE42 && HAVE_PCLMUL
static inline Function Choose_Extend() {
#ifdef HAVE_POWER8
return isAltiVec() ? ExtendPPCImpl : ExtendImpl<Slow_CRC32>;
#elif defined(HAVE_ARM64_CRC)
if(crc32c_runtime_check()) {
pmull_runtime_flag = crc32c_pmull_runtime_check();
return ExtendARMImpl;
} else {
return ExtendImpl<Slow_CRC32>;
}
#else
if (isSSE42()) {
if (isPCLMULQDQ()) {
#if defined HAVE_SSE42 && defined HAVE_PCLMUL && !defined NO_THREEWAY_CRC32C
return crc32c_3way;
#else
return ExtendImpl<Fast_CRC32>; // Fast_CRC32 will check HAVE_SSE42 itself
#endif
}
else { // no runtime PCLMULQDQ support but has SSE42 support
return ExtendImpl<Fast_CRC32>;
}
} // end of isSSE42()
else {
return ExtendImpl<Slow_CRC32>;
}
#endif
}
static Function ChosenExtend = Choose_Extend();
uint32_t Extend(uint32_t crc, const char* buf, size_t size) {
return ChosenExtend(crc, buf, size);
}
// The code for crc32c combine, copied with permission from folly
// Standard galois-field multiply. The only modification is that a,
// b, m, and p are all bit-reflected.
//
// https://en.wikipedia.org/wiki/Finite_field_arithmetic
static constexpr uint32_t gf_multiply_sw_1(
size_t i, uint32_t p, uint32_t a, uint32_t b, uint32_t m) {
// clang-format off
return i == 32 ? p : gf_multiply_sw_1(
/* i = */ i + 1,
/* p = */ p ^ ((0u-((b >> 31) & 1)) & a),
/* a = */ (a >> 1) ^ ((0u-(a & 1)) & m),
/* b = */ b << 1,
/* m = */ m);
// clang-format on
}
static constexpr uint32_t gf_multiply_sw(uint32_t a, uint32_t b, uint32_t m) {
return gf_multiply_sw_1(/* i = */ 0, /* p = */ 0, a, b, m);
}
static constexpr uint32_t gf_square_sw(uint32_t a, uint32_t m) {
return gf_multiply_sw(a, a, m);
}
template <size_t i, uint32_t m>
struct gf_powers_memo {
static constexpr uint32_t value =
gf_square_sw(gf_powers_memo<i - 1, m>::value, m);
};
template <uint32_t m>
struct gf_powers_memo<0, m> {
static constexpr uint32_t value = m;
};
template <typename T, T... Ints>
struct integer_sequence {
typedef T value_type;
static constexpr size_t size() { return sizeof...(Ints); }
};
template <typename T, std::size_t N, T... Is>
struct make_integer_sequence : make_integer_sequence<T, N - 1, N - 1, Is...> {};
template <typename T, T... Is>
struct make_integer_sequence<T, 0, Is...> : integer_sequence<T, Is...> {};
template <std::size_t N>
using make_index_sequence = make_integer_sequence<std::size_t, N>;
template <uint32_t m>
struct gf_powers_make {
template <size_t... i>
using index_sequence = integer_sequence<size_t, i...>;
template <size_t... i>
constexpr std::array<uint32_t, sizeof...(i)> operator()(
index_sequence<i...>) const {
return std::array<uint32_t, sizeof...(i)>{{gf_powers_memo<i, m>::value...}};
}
};
static constexpr uint32_t crc32c_m = 0x82f63b78;
static constexpr std::array<uint32_t, 62> const crc32c_powers =
gf_powers_make<crc32c_m>{}(make_index_sequence<62>{});
// Expects a "pure" crc (see Crc32cCombine)
static uint32_t Crc32AppendZeroes(
uint32_t crc, size_t len_over_4, uint32_t polynomial,
std::array<uint32_t, 62> const& powers_array) {
auto powers = powers_array.data();
// Append by multiplying by consecutive powers of two of the zeroes
// array
size_t len_bits = len_over_4;
while (len_bits) {
// Advance directly to next bit set.
auto r = CountTrailingZeroBits(len_bits);
len_bits >>= r;
powers += r;
crc = gf_multiply_sw(crc, *powers, polynomial);
len_bits >>= 1;
powers++;
}
return crc;
}
static inline uint32_t InvertedToPure(uint32_t crc) { return ~crc; }
static inline uint32_t PureToInverted(uint32_t crc) { return ~crc; }
static inline uint32_t PureExtend(uint32_t crc, const char* buf, size_t size) {
return InvertedToPure(Extend(PureToInverted(crc), buf, size));
}
// Background:
// RocksDB uses two kinds of crc32c values: masked and unmasked. Neither is
// a "pure" CRC because a pure CRC satisfies (^ for xor)
// crc(a ^ b) = crc(a) ^ crc(b)
// The unmasked is closest, and this function takes unmasked crc32c values.
// The unmasked values are impure in two ways:
// * The initial setting at the start of CRC computation is all 1 bits
// (like -1) instead of zero.
// * The result has all bits invered.
// Note that together, these result in the empty string having a crc32c of
// zero. See
// https://en.wikipedia.org/wiki/Computation_of_cyclic_redundancy_checks#CRC_variants
//
// Simplified version of strategy, using xor through pure CRCs (+ for concat):
//
// pure_crc(str1 + str2) = pure_crc(str1 + zeros(len(str2))) ^
// pure_crc(zeros(len(str1)) + str2)
//
// because the xor of these two zero-padded strings is str1 + str2. For pure
// CRC, leading zeros don't affect the result, so we only need
//
// pure_crc(str1 + str2) = pure_crc(str1 + zeros(len(str2))) ^
// pure_crc(str2)
//
// Considering we aren't working with pure CRCs, what is actually in the input?
//
// crc1 = PureToInverted(PureExtendCrc32c(-1, zeros, crc1len) ^
// PureCrc32c(str1, crc1len))
// crc2 = PureToInverted(PureExtendCrc32c(-1, zeros, crc2len) ^
// PureCrc32c(str2, crc2len))
//
// The result we want to compute is
// combined = PureToInverted(PureExtendCrc32c(PureExtendCrc32c(-1, zeros,
// crc1len) ^
// PureCrc32c(str1, crc1len),
// zeros, crc2len) ^
// PureCrc32c(str2, crc2len))
//
// Thus, in addition to extending crc1 over the length of str2 in (virtual)
// zeros, we need to cancel out the -1 initializer that was used in computing
// crc2. To cancel it out, we also need to extend it over crc2len in zeros.
// To simplify, since the end of str1 and that -1 initializer for crc2 are at
// the same logical position, we can combine them before we extend over the
// zeros.
uint32_t Crc32cCombine(uint32_t crc1, uint32_t crc2, size_t crc2len) {
uint32_t pure_crc1_with_init = InvertedToPure(crc1);
uint32_t pure_crc2_with_init = InvertedToPure(crc2);
uint32_t pure_crc2_init = static_cast<uint32_t>(-1);
// Append up to 32 bits of zeroes in the normal way
char zeros[4] = {0, 0, 0, 0};
auto len = crc2len & 3;
uint32_t tmp = pure_crc1_with_init ^ pure_crc2_init;
if (len) {
tmp = PureExtend(tmp, zeros, len);
}
return PureToInverted(
Crc32AppendZeroes(tmp, crc2len / 4, crc32c_m, crc32c_powers) ^
pure_crc2_with_init);
}
} // namespace crc32c
} // namespace ROCKSDB_NAMESPACE
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