// 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 #include #include #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 #endif #ifndef PPC_FEATURE2_VEC_CRYPTO #define PPC_FEATURE2_VEC_CRYPTO 0x02000000 #endif #ifndef AT_HWCAP2 #define AT_HWCAP2 26 #endif #elif __FreeBSD__ #include #include #include #endif /* __linux__ */ #endif ASSERT_FEATURE_COMPAT_HEADER(); #ifdef __SSE4_2__ #include #include #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}; #ifndef __SSE4_2__ 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(p)); } #endif // !__SSE4_2__ static inline void DefaultCRC32(uint64_t* l, uint8_t const** p) { #ifndef __SSE4_2__ uint32_t c = static_cast(*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(*l ^ LE_LOAD32(*p)); *p += 4; *l = table3_[c & 0xff] ^ table2_[(c >> 8) & 0xff] ^ table1_[(c >> 16) & 0xff] ^ table0_[c >> 24]; #elif defined(__LP64__) || defined(_WIN64) *l = _mm_crc32_u64(*l, DecodeFixed64(reinterpret_cast(*p))); *p += 8; #else *l = _mm_crc32_u32(static_cast(*l), LE_LOAD32(*p)); *p += 4; *l = _mm_crc32_u32(static_cast(*l), LE_LOAD32(*p)); *p += 4; #endif } template uint32_t ExtendImpl(uint32_t crc, const char* buf, size_t size) { const uint8_t* p = reinterpret_cast(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(p); const uint8_t* x = reinterpret_cast(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(l ^ 0xffffffffu); } using Function = uint32_t (*)(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 #ifdef __SSE4_2__ has_fast_crc = true; #endif // __SSE4_2__ 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 * * */ #if defined(__SSE4_2__) && defined(__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(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(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 //__SSE4_2__ && __PCLMUL__ static inline Function Choose_Extend() { #ifdef HAVE_POWER8 return isAltiVec() ? ExtendPPCImpl : ExtendImpl; #elif defined(HAVE_ARM64_CRC) if(crc32c_runtime_check()) { pmull_runtime_flag = crc32c_pmull_runtime_check(); return ExtendARMImpl; } else { return ExtendImpl; } #elif defined(__SSE4_2__) && defined(__PCLMUL__) && !defined NO_THREEWAY_CRC32C // NOTE: runtime detection no longer supported on x86 #ifdef _MSC_VER #pragma warning(disable: 4551) #endif (void)ExtendImpl; // suppress unused warning #ifdef _MSC_VER #pragma warning(default: 4551) #endif return crc32c_3way; #else return ExtendImpl; #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 struct gf_powers_memo { static constexpr uint32_t value = gf_square_sw(gf_powers_memo::value, m); }; template struct gf_powers_memo<0, m> { static constexpr uint32_t value = m; }; template struct integer_sequence { using value_type = T; static constexpr size_t size() { return sizeof...(Ints); } }; template struct make_integer_sequence : make_integer_sequence {}; template struct make_integer_sequence : integer_sequence {}; template using make_index_sequence = make_integer_sequence; template struct gf_powers_make { template using index_sequence = integer_sequence; template constexpr std::array operator()( index_sequence) const { return std::array{{gf_powers_memo::value...}}; } }; static constexpr uint32_t crc32c_m = 0x82f63b78; static constexpr std::array const crc32c_powers = gf_powers_make{}(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 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(-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