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crc3.h
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#include <stdint.h>
#if defined(__aarch64__)
# define HAVE_HW
# include "sse2neon.h"
#elif defined __SSE4_2__ && \
(defined __x86_64__ || defined __i686_64__ || defined _M_AMD64 || \
defined _M_IX86)
# define HAVE_HW
# include <smmintrin.h>
#endif
#if !defined HAVE_HW
#include <stddef.h>
/*
* CRC-32C table for the SW calc.
* poly = 0x1EDC6F41
*/
static const uint32_t crc32c_table[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,
0xAD7D5351L };
static uint32_t
crc32c(uint32_t crc, const uint8_t *data, size_t length)
{
while (length--) {
crc = crc32c_table[(crc ^ *data++) & 0xFF] ^ (crc >> 8);
}
return crc ^ 0xffffffff;
}
/* 2x 32bit hashes, resp. 4x 16bit for smaller sets. */
static inline void
crc2(const void *key, size_t len, uint64_t seed, uint64_t *hashes)
{
uint8_t *data = (uint8_t *)key;
uint32_t *seed32 = (uint32_t *)&seed;
uint32_t *h32 = (uint32_t *)hashes;
h32[0] = crc32c(seed32[0], data, len);
h32[1] = crc32c(seed32[1], data, len);
}
/* 3x 32bit hashes. */
static inline void
crc3(const void *key, size_t len, uint64_t seed, uint64_t *hashes)
{
uint8_t *data = (uint8_t *)key;
uint32_t *seed32 = (uint32_t *)&seed;
uint32_t *h32 = (uint32_t *)hashes;
h32[0] = crc32c(seed32[0], data, len);
h32[1] = crc32c(seed32[1], data, len);
h32[2] = crc32c(seed32[0] ^ seed32[1], data, len);
}
#else // HAVE_HW
#define ALIGN_SIZE 0x08UL
#define ALIGN_MASK (ALIGN_SIZE - 1)
#define CALC_CRC2(op, h1, h2, type, buf, len) \
do { \
for (; (len) >= sizeof(type); \
(len) -= sizeof(type), buf += sizeof(type)) { \
(h1) = op((h1), *(type *)(buf)); \
(h2) = op((h2), *(type *)(buf)); \
} \
} while (0)
#define CALC_CRC3(op, h1, h2, h3, type, buf, len) \
do { \
for (; (len) >= sizeof(type); \
(len) -= sizeof(type), buf += sizeof(type)) { \
(h1) = op((h1), *(type *)(buf)); \
(h2) = op((h2), *(type *)(buf)); \
(h3) = op((h3), *(type *)(buf)); \
} \
} while (0)
static inline void
crc2(const void *key, size_t len, uint64_t seed, uint64_t *hashes)
{
uint8_t *buf = (uint8_t *)key;
const uint32_t *seed32 = (const uint32_t *)&seed;
uint32_t h1 = seed32[0];
uint32_t h2 = seed32[1];
uint32_t *h32 = (uint32_t *)hashes;
// Align the input to the word boundary
for (; (len > 0) && ((size_t)buf & ALIGN_MASK); len--, buf++) {
h1 = _mm_crc32_u8(h1, *buf);
h2 = _mm_crc32_u8(h2, *buf);
}
#if defined(__x86_64__) || defined(__aarch64__)
CALC_CRC2(_mm_crc32_u64, h1, h2, uint64_t, buf, len);
#endif
CALC_CRC2(_mm_crc32_u32, h1, h2, uint32_t, buf, len);
CALC_CRC2(_mm_crc32_u16, h1, h2, uint16_t, buf, len);
CALC_CRC2(_mm_crc32_u8, h1, h2, uint8_t, buf, len);
h32[0] = h1;
h32[1] = h2;
}
static inline void
crc3(const void *key, size_t len, uint64_t seed, uint64_t *hashes)
{
uint8_t *buf = (uint8_t *)key;
const uint32_t *seed32 = (const uint32_t *)&seed;
uint32_t h1 = seed32[0];
uint32_t h2 = seed32[1];
uint32_t h3 = h1 ^ h2;
uint32_t *h32 = (uint32_t *)hashes;
// Align the input to the word boundary
for (; (len > 0) && ((size_t)buf & ALIGN_MASK); len--, buf++) {
h1 = _mm_crc32_u8(h1, *buf);
h2 = _mm_crc32_u8(h2, *buf);
h3 = _mm_crc32_u8(h3, *buf);
}
#if defined(__x86_64__) || defined(__aarch64__)
CALC_CRC3(_mm_crc32_u64, h1, h2, h3, uint64_t, buf, len);
#endif
CALC_CRC3(_mm_crc32_u32, h1, h2, h3, uint32_t, buf, len);
CALC_CRC3(_mm_crc32_u16, h1, h2, h3, uint16_t, buf, len);
CALC_CRC3(_mm_crc32_u8, h1, h2, h3, uint8_t, buf, len);
h32[0] = h1;
h32[1] = h2;
h32[2] = h3;
}
#endif