| /* |
| * xxHash - Extremely Fast Hash algorithm |
| * Copyright (C) 2012-2023, Yann Collet |
| * |
| * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| * You can contact the author at : |
| * - xxHash homepage: http://www.xxhash.com |
| * - xxHash source repository : https://github.com/Cyan4973/xxHash |
| */ |
| |
| // xxhash64 is based on commit d2df04efcbef7d7f6886d345861e5dfda4edacc1. Removed |
| // everything but a simple interface for computing xxh64. |
| |
| // xxh3_64bits is based on commit d5891596637d21366b9b1dcf2c0007a3edb26a9e (July |
| // 2023). |
| |
| // xxh3_128bits is based on commit b0adcc54188c3130b1793e7b19c62eb1e669f7df |
| // (June 2024). |
| |
| #include "llvm/Support/xxhash.h" |
| #include "llvm/Support/Compiler.h" |
| #include "llvm/Support/Endian.h" |
| |
| #include <stdlib.h> |
| |
| #if !defined(LLVM_XXH_USE_NEON) |
| #if (defined(__aarch64__) || defined(_M_ARM64) || defined(_M_ARM64EC)) && \ |
| !defined(__ARM_BIG_ENDIAN) |
| #define LLVM_XXH_USE_NEON 1 |
| #else |
| #define LLVM_XXH_USE_NEON 0 |
| #endif |
| #endif |
| |
| #if LLVM_XXH_USE_NEON |
| #include <arm_neon.h> |
| #endif |
| |
| using namespace llvm; |
| using namespace support; |
| |
| static uint64_t rotl64(uint64_t X, size_t R) { |
| return (X << R) | (X >> (64 - R)); |
| } |
| |
| constexpr uint32_t PRIME32_1 = 0x9E3779B1; |
| constexpr uint32_t PRIME32_2 = 0x85EBCA77; |
| constexpr uint32_t PRIME32_3 = 0xC2B2AE3D; |
| |
| static const uint64_t PRIME64_1 = 11400714785074694791ULL; |
| static const uint64_t PRIME64_2 = 14029467366897019727ULL; |
| static const uint64_t PRIME64_3 = 1609587929392839161ULL; |
| static const uint64_t PRIME64_4 = 9650029242287828579ULL; |
| static const uint64_t PRIME64_5 = 2870177450012600261ULL; |
| |
| static uint64_t round(uint64_t Acc, uint64_t Input) { |
| Acc += Input * PRIME64_2; |
| Acc = rotl64(Acc, 31); |
| Acc *= PRIME64_1; |
| return Acc; |
| } |
| |
| static uint64_t mergeRound(uint64_t Acc, uint64_t Val) { |
| Val = round(0, Val); |
| Acc ^= Val; |
| Acc = Acc * PRIME64_1 + PRIME64_4; |
| return Acc; |
| } |
| |
| static uint64_t XXH64_avalanche(uint64_t hash) { |
| hash ^= hash >> 33; |
| hash *= PRIME64_2; |
| hash ^= hash >> 29; |
| hash *= PRIME64_3; |
| hash ^= hash >> 32; |
| return hash; |
| } |
| |
| uint64_t llvm::xxHash64(StringRef Data) { |
| size_t Len = Data.size(); |
| uint64_t Seed = 0; |
| const unsigned char *P = Data.bytes_begin(); |
| const unsigned char *const BEnd = Data.bytes_end(); |
| uint64_t H64; |
| |
| if (Len >= 32) { |
| const unsigned char *const Limit = BEnd - 32; |
| uint64_t V1 = Seed + PRIME64_1 + PRIME64_2; |
| uint64_t V2 = Seed + PRIME64_2; |
| uint64_t V3 = Seed + 0; |
| uint64_t V4 = Seed - PRIME64_1; |
| |
| do { |
| V1 = round(V1, endian::read64le(P)); |
| P += 8; |
| V2 = round(V2, endian::read64le(P)); |
| P += 8; |
| V3 = round(V3, endian::read64le(P)); |
| P += 8; |
| V4 = round(V4, endian::read64le(P)); |
| P += 8; |
| } while (P <= Limit); |
| |
| H64 = rotl64(V1, 1) + rotl64(V2, 7) + rotl64(V3, 12) + rotl64(V4, 18); |
| H64 = mergeRound(H64, V1); |
| H64 = mergeRound(H64, V2); |
| H64 = mergeRound(H64, V3); |
| H64 = mergeRound(H64, V4); |
| |
| } else { |
| H64 = Seed + PRIME64_5; |
| } |
| |
| H64 += (uint64_t)Len; |
| |
| while (reinterpret_cast<uintptr_t>(P) + 8 <= |
| reinterpret_cast<uintptr_t>(BEnd)) { |
| uint64_t const K1 = round(0, endian::read64le(P)); |
| H64 ^= K1; |
| H64 = rotl64(H64, 27) * PRIME64_1 + PRIME64_4; |
| P += 8; |
| } |
| |
| if (reinterpret_cast<uintptr_t>(P) + 4 <= reinterpret_cast<uintptr_t>(BEnd)) { |
| H64 ^= (uint64_t)(endian::read32le(P)) * PRIME64_1; |
| H64 = rotl64(H64, 23) * PRIME64_2 + PRIME64_3; |
| P += 4; |
| } |
| |
| while (P < BEnd) { |
| H64 ^= (*P) * PRIME64_5; |
| H64 = rotl64(H64, 11) * PRIME64_1; |
| P++; |
| } |
| |
| return XXH64_avalanche(H64); |
| } |
| |
| uint64_t llvm::xxHash64(ArrayRef<uint8_t> Data) { |
| return xxHash64({(const char *)Data.data(), Data.size()}); |
| } |
| |
| constexpr size_t XXH3_SECRETSIZE_MIN = 136; |
| constexpr size_t XXH_SECRET_DEFAULT_SIZE = 192; |
| |
| /* Pseudorandom data taken directly from FARSH */ |
| // clang-format off |
| constexpr uint8_t kSecret[XXH_SECRET_DEFAULT_SIZE] = { |
| 0xb8, 0xfe, 0x6c, 0x39, 0x23, 0xa4, 0x4b, 0xbe, 0x7c, 0x01, 0x81, 0x2c, 0xf7, 0x21, 0xad, 0x1c, |
| 0xde, 0xd4, 0x6d, 0xe9, 0x83, 0x90, 0x97, 0xdb, 0x72, 0x40, 0xa4, 0xa4, 0xb7, 0xb3, 0x67, 0x1f, |
| 0xcb, 0x79, 0xe6, 0x4e, 0xcc, 0xc0, 0xe5, 0x78, 0x82, 0x5a, 0xd0, 0x7d, 0xcc, 0xff, 0x72, 0x21, |
| 0xb8, 0x08, 0x46, 0x74, 0xf7, 0x43, 0x24, 0x8e, 0xe0, 0x35, 0x90, 0xe6, 0x81, 0x3a, 0x26, 0x4c, |
| 0x3c, 0x28, 0x52, 0xbb, 0x91, 0xc3, 0x00, 0xcb, 0x88, 0xd0, 0x65, 0x8b, 0x1b, 0x53, 0x2e, 0xa3, |
| 0x71, 0x64, 0x48, 0x97, 0xa2, 0x0d, 0xf9, 0x4e, 0x38, 0x19, 0xef, 0x46, 0xa9, 0xde, 0xac, 0xd8, |
| 0xa8, 0xfa, 0x76, 0x3f, 0xe3, 0x9c, 0x34, 0x3f, 0xf9, 0xdc, 0xbb, 0xc7, 0xc7, 0x0b, 0x4f, 0x1d, |
| 0x8a, 0x51, 0xe0, 0x4b, 0xcd, 0xb4, 0x59, 0x31, 0xc8, 0x9f, 0x7e, 0xc9, 0xd9, 0x78, 0x73, 0x64, |
| 0xea, 0xc5, 0xac, 0x83, 0x34, 0xd3, 0xeb, 0xc3, 0xc5, 0x81, 0xa0, 0xff, 0xfa, 0x13, 0x63, 0xeb, |
| 0x17, 0x0d, 0xdd, 0x51, 0xb7, 0xf0, 0xda, 0x49, 0xd3, 0x16, 0x55, 0x26, 0x29, 0xd4, 0x68, 0x9e, |
| 0x2b, 0x16, 0xbe, 0x58, 0x7d, 0x47, 0xa1, 0xfc, 0x8f, 0xf8, 0xb8, 0xd1, 0x7a, 0xd0, 0x31, 0xce, |
| 0x45, 0xcb, 0x3a, 0x8f, 0x95, 0x16, 0x04, 0x28, 0xaf, 0xd7, 0xfb, 0xca, 0xbb, 0x4b, 0x40, 0x7e, |
| }; |
| // clang-format on |
| |
| constexpr uint64_t PRIME_MX1 = 0x165667919E3779F9; |
| constexpr uint64_t PRIME_MX2 = 0x9FB21C651E98DF25; |
| |
| // Calculates a 64-bit to 128-bit multiply, then XOR folds it. |
| static uint64_t XXH3_mul128_fold64(uint64_t lhs, uint64_t rhs) { |
| #if defined(__SIZEOF_INT128__) || \ |
| (defined(_INTEGRAL_MAX_BITS) && _INTEGRAL_MAX_BITS >= 128) |
| __uint128_t product = (__uint128_t)lhs * (__uint128_t)rhs; |
| return uint64_t(product) ^ uint64_t(product >> 64); |
| |
| #else |
| /* First calculate all of the cross products. */ |
| const uint64_t lo_lo = (lhs & 0xFFFFFFFF) * (rhs & 0xFFFFFFFF); |
| const uint64_t hi_lo = (lhs >> 32) * (rhs & 0xFFFFFFFF); |
| const uint64_t lo_hi = (lhs & 0xFFFFFFFF) * (rhs >> 32); |
| const uint64_t hi_hi = (lhs >> 32) * (rhs >> 32); |
| |
| /* Now add the products together. These will never overflow. */ |
| const uint64_t cross = (lo_lo >> 32) + (hi_lo & 0xFFFFFFFF) + lo_hi; |
| const uint64_t upper = (hi_lo >> 32) + (cross >> 32) + hi_hi; |
| const uint64_t lower = (cross << 32) | (lo_lo & 0xFFFFFFFF); |
| |
| return upper ^ lower; |
| #endif |
| } |
| |
| constexpr size_t XXH_STRIPE_LEN = 64; |
| constexpr size_t XXH_SECRET_CONSUME_RATE = 8; |
| constexpr size_t XXH_ACC_NB = XXH_STRIPE_LEN / sizeof(uint64_t); |
| |
| static uint64_t XXH3_avalanche(uint64_t hash) { |
| hash ^= hash >> 37; |
| hash *= PRIME_MX1; |
| hash ^= hash >> 32; |
| return hash; |
| } |
| |
| static uint64_t XXH3_len_1to3_64b(const uint8_t *input, size_t len, |
| const uint8_t *secret, uint64_t seed) { |
| const uint8_t c1 = input[0]; |
| const uint8_t c2 = input[len >> 1]; |
| const uint8_t c3 = input[len - 1]; |
| uint32_t combined = ((uint32_t)c1 << 16) | ((uint32_t)c2 << 24) | |
| ((uint32_t)c3 << 0) | ((uint32_t)len << 8); |
| uint64_t bitflip = |
| (uint64_t)(endian::read32le(secret) ^ endian::read32le(secret + 4)) + |
| seed; |
| return XXH64_avalanche(uint64_t(combined) ^ bitflip); |
| } |
| |
| static uint64_t XXH3_len_4to8_64b(const uint8_t *input, size_t len, |
| const uint8_t *secret, uint64_t seed) { |
| seed ^= (uint64_t)byteswap(uint32_t(seed)) << 32; |
| const uint32_t input1 = endian::read32le(input); |
| const uint32_t input2 = endian::read32le(input + len - 4); |
| uint64_t acc = |
| (endian::read64le(secret + 8) ^ endian::read64le(secret + 16)) - seed; |
| const uint64_t input64 = (uint64_t)input2 | ((uint64_t)input1 << 32); |
| acc ^= input64; |
| // XXH3_rrmxmx(acc, len) |
| acc ^= rotl64(acc, 49) ^ rotl64(acc, 24); |
| acc *= PRIME_MX2; |
| acc ^= (acc >> 35) + (uint64_t)len; |
| acc *= PRIME_MX2; |
| return acc ^ (acc >> 28); |
| } |
| |
| static uint64_t XXH3_len_9to16_64b(const uint8_t *input, size_t len, |
| const uint8_t *secret, uint64_t const seed) { |
| uint64_t input_lo = |
| (endian::read64le(secret + 24) ^ endian::read64le(secret + 32)) + seed; |
| uint64_t input_hi = |
| (endian::read64le(secret + 40) ^ endian::read64le(secret + 48)) - seed; |
| input_lo ^= endian::read64le(input); |
| input_hi ^= endian::read64le(input + len - 8); |
| uint64_t acc = uint64_t(len) + byteswap(input_lo) + input_hi + |
| XXH3_mul128_fold64(input_lo, input_hi); |
| return XXH3_avalanche(acc); |
| } |
| |
| LLVM_ATTRIBUTE_ALWAYS_INLINE |
| static uint64_t XXH3_len_0to16_64b(const uint8_t *input, size_t len, |
| const uint8_t *secret, uint64_t const seed) { |
| if (LLVM_LIKELY(len > 8)) |
| return XXH3_len_9to16_64b(input, len, secret, seed); |
| if (LLVM_LIKELY(len >= 4)) |
| return XXH3_len_4to8_64b(input, len, secret, seed); |
| if (len != 0) |
| return XXH3_len_1to3_64b(input, len, secret, seed); |
| return XXH64_avalanche(seed ^ endian::read64le(secret + 56) ^ |
| endian::read64le(secret + 64)); |
| } |
| |
| static uint64_t XXH3_mix16B(const uint8_t *input, uint8_t const *secret, |
| uint64_t seed) { |
| uint64_t lhs = seed; |
| uint64_t rhs = 0U - seed; |
| lhs += endian::read64le(secret); |
| rhs += endian::read64le(secret + 8); |
| lhs ^= endian::read64le(input); |
| rhs ^= endian::read64le(input + 8); |
| return XXH3_mul128_fold64(lhs, rhs); |
| } |
| |
| /* For mid range keys, XXH3 uses a Mum-hash variant. */ |
| LLVM_ATTRIBUTE_ALWAYS_INLINE |
| static uint64_t XXH3_len_17to128_64b(const uint8_t *input, size_t len, |
| const uint8_t *secret, |
| uint64_t const seed) { |
| uint64_t acc = len * PRIME64_1, acc_end; |
| acc += XXH3_mix16B(input + 0, secret + 0, seed); |
| acc_end = XXH3_mix16B(input + len - 16, secret + 16, seed); |
| if (len > 32) { |
| acc += XXH3_mix16B(input + 16, secret + 32, seed); |
| acc_end += XXH3_mix16B(input + len - 32, secret + 48, seed); |
| if (len > 64) { |
| acc += XXH3_mix16B(input + 32, secret + 64, seed); |
| acc_end += XXH3_mix16B(input + len - 48, secret + 80, seed); |
| if (len > 96) { |
| acc += XXH3_mix16B(input + 48, secret + 96, seed); |
| acc_end += XXH3_mix16B(input + len - 64, secret + 112, seed); |
| } |
| } |
| } |
| return XXH3_avalanche(acc + acc_end); |
| } |
| |
| constexpr size_t XXH3_MIDSIZE_MAX = 240; |
| constexpr size_t XXH3_MIDSIZE_STARTOFFSET = 3; |
| constexpr size_t XXH3_MIDSIZE_LASTOFFSET = 17; |
| |
| LLVM_ATTRIBUTE_NOINLINE |
| static uint64_t XXH3_len_129to240_64b(const uint8_t *input, size_t len, |
| const uint8_t *secret, uint64_t seed) { |
| uint64_t acc = (uint64_t)len * PRIME64_1; |
| const unsigned nbRounds = len / 16; |
| for (unsigned i = 0; i < 8; ++i) |
| acc += XXH3_mix16B(input + 16 * i, secret + 16 * i, seed); |
| acc = XXH3_avalanche(acc); |
| |
| for (unsigned i = 8; i < nbRounds; ++i) { |
| acc += XXH3_mix16B(input + 16 * i, |
| secret + 16 * (i - 8) + XXH3_MIDSIZE_STARTOFFSET, seed); |
| } |
| /* last bytes */ |
| acc += |
| XXH3_mix16B(input + len - 16, |
| secret + XXH3_SECRETSIZE_MIN - XXH3_MIDSIZE_LASTOFFSET, seed); |
| return XXH3_avalanche(acc); |
| } |
| |
| #if LLVM_XXH_USE_NEON |
| |
| #define XXH3_accumulate_512 XXH3_accumulate_512_neon |
| #define XXH3_scrambleAcc XXH3_scrambleAcc_neon |
| |
| // NEON implementation based on commit a57f6cce2698049863af8c25787084ae0489d849 |
| // (July 2024), with the following removed: |
| // - workaround for suboptimal codegen on older GCC |
| // - compiler barriers against instruction reordering |
| // - WebAssembly SIMD support |
| // - configurable split between NEON and scalar lanes (benchmarking shows no |
| // penalty when fully doing SIMD on the Apple M1) |
| |
| #if defined(__GNUC__) || defined(__clang__) |
| #define XXH_ALIASING __attribute__((__may_alias__)) |
| #else |
| #define XXH_ALIASING /* nothing */ |
| #endif |
| |
| typedef uint64x2_t xxh_aliasing_uint64x2_t XXH_ALIASING; |
| |
| LLVM_ATTRIBUTE_ALWAYS_INLINE static uint64x2_t XXH_vld1q_u64(void const *ptr) { |
| return vreinterpretq_u64_u8(vld1q_u8((uint8_t const *)ptr)); |
| } |
| |
| LLVM_ATTRIBUTE_ALWAYS_INLINE |
| static void XXH3_accumulate_512_neon(uint64_t *acc, const uint8_t *input, |
| const uint8_t *secret) { |
| xxh_aliasing_uint64x2_t *const xacc = (xxh_aliasing_uint64x2_t *)acc; |
| |
| #ifdef __clang__ |
| #pragma clang loop unroll(full) |
| #endif |
| for (size_t i = 0; i < XXH_ACC_NB / 2; i += 2) { |
| /* data_vec = input[i]; */ |
| uint64x2_t data_vec_1 = XXH_vld1q_u64(input + (i * 16)); |
| uint64x2_t data_vec_2 = XXH_vld1q_u64(input + ((i + 1) * 16)); |
| |
| /* key_vec = secret[i]; */ |
| uint64x2_t key_vec_1 = XXH_vld1q_u64(secret + (i * 16)); |
| uint64x2_t key_vec_2 = XXH_vld1q_u64(secret + ((i + 1) * 16)); |
| |
| /* data_swap = swap(data_vec) */ |
| uint64x2_t data_swap_1 = vextq_u64(data_vec_1, data_vec_1, 1); |
| uint64x2_t data_swap_2 = vextq_u64(data_vec_2, data_vec_2, 1); |
| |
| /* data_key = data_vec ^ key_vec; */ |
| uint64x2_t data_key_1 = veorq_u64(data_vec_1, key_vec_1); |
| uint64x2_t data_key_2 = veorq_u64(data_vec_2, key_vec_2); |
| |
| /* |
| * If we reinterpret the 64x2 vectors as 32x4 vectors, we can use a |
| * de-interleave operation for 4 lanes in 1 step with `vuzpq_u32` to |
| * get one vector with the low 32 bits of each lane, and one vector |
| * with the high 32 bits of each lane. |
| * |
| * The intrinsic returns a double vector because the original ARMv7-a |
| * instruction modified both arguments in place. AArch64 and SIMD128 emit |
| * two instructions from this intrinsic. |
| * |
| * [ dk11L | dk11H | dk12L | dk12H ] -> [ dk11L | dk12L | dk21L | dk22L ] |
| * [ dk21L | dk21H | dk22L | dk22H ] -> [ dk11H | dk12H | dk21H | dk22H ] |
| */ |
| uint32x4x2_t unzipped = vuzpq_u32(vreinterpretq_u32_u64(data_key_1), |
| vreinterpretq_u32_u64(data_key_2)); |
| |
| /* data_key_lo = data_key & 0xFFFFFFFF */ |
| uint32x4_t data_key_lo = unzipped.val[0]; |
| /* data_key_hi = data_key >> 32 */ |
| uint32x4_t data_key_hi = unzipped.val[1]; |
| |
| /* |
| * Then, we can split the vectors horizontally and multiply which, as for |
| * most widening intrinsics, have a variant that works on both high half |
| * vectors for free on AArch64. A similar instruction is available on |
| * SIMD128. |
| * |
| * sum = data_swap + (u64x2) data_key_lo * (u64x2) data_key_hi |
| */ |
| uint64x2_t sum_1 = vmlal_u32(data_swap_1, vget_low_u32(data_key_lo), |
| vget_low_u32(data_key_hi)); |
| uint64x2_t sum_2 = vmlal_u32(data_swap_2, vget_high_u32(data_key_lo), |
| vget_high_u32(data_key_hi)); |
| |
| /* xacc[i] = acc_vec + sum; */ |
| xacc[i] = vaddq_u64(xacc[i], sum_1); |
| xacc[i + 1] = vaddq_u64(xacc[i + 1], sum_2); |
| } |
| } |
| |
| LLVM_ATTRIBUTE_ALWAYS_INLINE |
| static void XXH3_scrambleAcc_neon(uint64_t *acc, const uint8_t *secret) { |
| xxh_aliasing_uint64x2_t *const xacc = (xxh_aliasing_uint64x2_t *)acc; |
| |
| /* { prime32_1, prime32_1 } */ |
| uint32x2_t const kPrimeLo = vdup_n_u32(PRIME32_1); |
| /* { 0, prime32_1, 0, prime32_1 } */ |
| uint32x4_t const kPrimeHi = |
| vreinterpretq_u32_u64(vdupq_n_u64((uint64_t)PRIME32_1 << 32)); |
| |
| for (size_t i = 0; i < XXH_ACC_NB / 2; ++i) { |
| /* xacc[i] ^= (xacc[i] >> 47); */ |
| uint64x2_t acc_vec = XXH_vld1q_u64(acc + (2 * i)); |
| uint64x2_t shifted = vshrq_n_u64(acc_vec, 47); |
| uint64x2_t data_vec = veorq_u64(acc_vec, shifted); |
| |
| /* xacc[i] ^= secret[i]; */ |
| uint64x2_t key_vec = XXH_vld1q_u64(secret + (i * 16)); |
| uint64x2_t data_key = veorq_u64(data_vec, key_vec); |
| |
| /* |
| * xacc[i] *= XXH_PRIME32_1 |
| * |
| * Expanded version with portable NEON intrinsics |
| * |
| * lo(x) * lo(y) + (hi(x) * lo(y) << 32) |
| * |
| * prod_hi = hi(data_key) * lo(prime) << 32 |
| * |
| * Since we only need 32 bits of this multiply a trick can be used, |
| * reinterpreting the vector as a uint32x4_t and multiplying by |
| * { 0, prime, 0, prime } to cancel out the unwanted bits and avoid the |
| * shift. |
| */ |
| uint32x4_t prod_hi = vmulq_u32(vreinterpretq_u32_u64(data_key), kPrimeHi); |
| |
| /* Extract low bits for vmlal_u32 */ |
| uint32x2_t data_key_lo = vmovn_u64(data_key); |
| |
| /* xacc[i] = prod_hi + lo(data_key) * XXH_PRIME32_1; */ |
| xacc[i] = vmlal_u32(vreinterpretq_u64_u32(prod_hi), data_key_lo, kPrimeLo); |
| } |
| } |
| #else |
| |
| #define XXH3_accumulate_512 XXH3_accumulate_512_scalar |
| #define XXH3_scrambleAcc XXH3_scrambleAcc_scalar |
| |
| LLVM_ATTRIBUTE_ALWAYS_INLINE |
| static void XXH3_accumulate_512_scalar(uint64_t *acc, const uint8_t *input, |
| const uint8_t *secret) { |
| for (size_t i = 0; i < XXH_ACC_NB; ++i) { |
| uint64_t data_val = endian::read64le(input + 8 * i); |
| uint64_t data_key = data_val ^ endian::read64le(secret + 8 * i); |
| acc[i ^ 1] += data_val; |
| acc[i] += uint32_t(data_key) * (data_key >> 32); |
| } |
| } |
| |
| LLVM_ATTRIBUTE_ALWAYS_INLINE |
| static void XXH3_scrambleAcc_scalar(uint64_t *acc, const uint8_t *secret) { |
| for (size_t i = 0; i < XXH_ACC_NB; ++i) { |
| acc[i] ^= acc[i] >> 47; |
| acc[i] ^= endian::read64le(secret + 8 * i); |
| acc[i] *= PRIME32_1; |
| } |
| } |
| #endif |
| |
| LLVM_ATTRIBUTE_ALWAYS_INLINE |
| static void XXH3_accumulate(uint64_t *acc, const uint8_t *input, |
| const uint8_t *secret, size_t nbStripes) { |
| for (size_t n = 0; n < nbStripes; ++n) { |
| XXH3_accumulate_512(acc, input + n * XXH_STRIPE_LEN, |
| secret + n * XXH_SECRET_CONSUME_RATE); |
| } |
| } |
| |
| static uint64_t XXH3_mix2Accs(const uint64_t *acc, const uint8_t *secret) { |
| return XXH3_mul128_fold64(acc[0] ^ endian::read64le(secret), |
| acc[1] ^ endian::read64le(secret + 8)); |
| } |
| |
| static uint64_t XXH3_mergeAccs(const uint64_t *acc, const uint8_t *key, |
| uint64_t start) { |
| uint64_t result64 = start; |
| for (size_t i = 0; i < 4; ++i) |
| result64 += XXH3_mix2Accs(acc + 2 * i, key + 16 * i); |
| return XXH3_avalanche(result64); |
| } |
| |
| LLVM_ATTRIBUTE_NOINLINE |
| static uint64_t XXH3_hashLong_64b(const uint8_t *input, size_t len, |
| const uint8_t *secret, size_t secretSize) { |
| const size_t nbStripesPerBlock = |
| (secretSize - XXH_STRIPE_LEN) / XXH_SECRET_CONSUME_RATE; |
| const size_t block_len = XXH_STRIPE_LEN * nbStripesPerBlock; |
| const size_t nb_blocks = (len - 1) / block_len; |
| alignas(16) uint64_t acc[XXH_ACC_NB] = { |
| PRIME32_3, PRIME64_1, PRIME64_2, PRIME64_3, |
| PRIME64_4, PRIME32_2, PRIME64_5, PRIME32_1, |
| }; |
| for (size_t n = 0; n < nb_blocks; ++n) { |
| XXH3_accumulate(acc, input + n * block_len, secret, nbStripesPerBlock); |
| XXH3_scrambleAcc(acc, secret + secretSize - XXH_STRIPE_LEN); |
| } |
| |
| /* last partial block */ |
| const size_t nbStripes = (len - 1 - (block_len * nb_blocks)) / XXH_STRIPE_LEN; |
| assert(nbStripes <= secretSize / XXH_SECRET_CONSUME_RATE); |
| XXH3_accumulate(acc, input + nb_blocks * block_len, secret, nbStripes); |
| |
| /* last stripe */ |
| constexpr size_t XXH_SECRET_LASTACC_START = 7; |
| XXH3_accumulate_512(acc, input + len - XXH_STRIPE_LEN, |
| secret + secretSize - XXH_STRIPE_LEN - |
| XXH_SECRET_LASTACC_START); |
| |
| /* converge into final hash */ |
| constexpr size_t XXH_SECRET_MERGEACCS_START = 11; |
| return XXH3_mergeAccs(acc, secret + XXH_SECRET_MERGEACCS_START, |
| (uint64_t)len * PRIME64_1); |
| } |
| |
| uint64_t llvm::xxh3_64bits(ArrayRef<uint8_t> data) { |
| auto *in = data.data(); |
| size_t len = data.size(); |
| if (len <= 16) |
| return XXH3_len_0to16_64b(in, len, kSecret, 0); |
| if (len <= 128) |
| return XXH3_len_17to128_64b(in, len, kSecret, 0); |
| if (len <= XXH3_MIDSIZE_MAX) |
| return XXH3_len_129to240_64b(in, len, kSecret, 0); |
| return XXH3_hashLong_64b(in, len, kSecret, sizeof(kSecret)); |
| } |
| |
| /* ========================================== |
| * XXH3 128 bits (a.k.a XXH128) |
| * ========================================== |
| * XXH3's 128-bit variant has better mixing and strength than the 64-bit |
| * variant, even without counting the significantly larger output size. |
| * |
| * For example, extra steps are taken to avoid the seed-dependent collisions |
| * in 17-240 byte inputs (See XXH3_mix16B and XXH128_mix32B). |
| * |
| * This strength naturally comes at the cost of some speed, especially on short |
| * lengths. Note that longer hashes are about as fast as the 64-bit version |
| * due to it using only a slight modification of the 64-bit loop. |
| * |
| * XXH128 is also more oriented towards 64-bit machines. It is still extremely |
| * fast for a _128-bit_ hash on 32-bit (it usually clears XXH64). |
| */ |
| |
| /*! |
| * @internal |
| * @def XXH_rotl32(x,r) |
| * @brief 32-bit rotate left. |
| * |
| * @param x The 32-bit integer to be rotated. |
| * @param r The number of bits to rotate. |
| * @pre |
| * @p r > 0 && @p r < 32 |
| * @note |
| * @p x and @p r may be evaluated multiple times. |
| * @return The rotated result. |
| */ |
| #if __has_builtin(__builtin_rotateleft32) && \ |
| __has_builtin(__builtin_rotateleft64) |
| #define XXH_rotl32 __builtin_rotateleft32 |
| #define XXH_rotl64 __builtin_rotateleft64 |
| /* Note: although _rotl exists for minGW (GCC under windows), performance seems |
| * poor */ |
| #elif defined(_MSC_VER) |
| #define XXH_rotl32(x, r) _rotl(x, r) |
| #define XXH_rotl64(x, r) _rotl64(x, r) |
| #else |
| #define XXH_rotl32(x, r) (((x) << (r)) | ((x) >> (32 - (r)))) |
| #define XXH_rotl64(x, r) (((x) << (r)) | ((x) >> (64 - (r)))) |
| #endif |
| |
| #define XXH_mult32to64(x, y) ((uint64_t)(uint32_t)(x) * (uint64_t)(uint32_t)(y)) |
| |
| /*! |
| * @brief Calculates a 64->128-bit long multiply. |
| * |
| * Uses `__uint128_t` and `_umul128` if available, otherwise uses a scalar |
| * version. |
| * |
| * @param lhs , rhs The 64-bit integers to be multiplied |
| * @return The 128-bit result represented in an @ref XXH128_hash_t. |
| */ |
| static XXH128_hash_t XXH_mult64to128(uint64_t lhs, uint64_t rhs) { |
| /* |
| * GCC/Clang __uint128_t method. |
| * |
| * On most 64-bit targets, GCC and Clang define a __uint128_t type. |
| * This is usually the best way as it usually uses a native long 64-bit |
| * multiply, such as MULQ on x86_64 or MUL + UMULH on aarch64. |
| * |
| * Usually. |
| * |
| * Despite being a 32-bit platform, Clang (and emscripten) define this type |
| * despite not having the arithmetic for it. This results in a laggy |
| * compiler builtin call which calculates a full 128-bit multiply. |
| * In that case it is best to use the portable one. |
| * https://github.com/Cyan4973/xxHash/issues/211#issuecomment-515575677 |
| */ |
| #if (defined(__GNUC__) || defined(__clang__)) && !defined(__wasm__) && \ |
| defined(__SIZEOF_INT128__) || \ |
| (defined(_INTEGRAL_MAX_BITS) && _INTEGRAL_MAX_BITS >= 128) |
| |
| __uint128_t const product = (__uint128_t)lhs * (__uint128_t)rhs; |
| XXH128_hash_t r128; |
| r128.low64 = (uint64_t)(product); |
| r128.high64 = (uint64_t)(product >> 64); |
| return r128; |
| |
| /* |
| * MSVC for x64's _umul128 method. |
| * |
| * uint64_t _umul128(uint64_t Multiplier, uint64_t Multiplicand, uint64_t |
| * *HighProduct); |
| * |
| * This compiles to single operand MUL on x64. |
| */ |
| #elif (defined(_M_X64) || defined(_M_IA64)) && !defined(_M_ARM64EC) |
| |
| #ifndef _MSC_VER |
| #pragma intrinsic(_umul128) |
| #endif |
| uint64_t product_high; |
| uint64_t const product_low = _umul128(lhs, rhs, &product_high); |
| XXH128_hash_t r128; |
| r128.low64 = product_low; |
| r128.high64 = product_high; |
| return r128; |
| |
| /* |
| * MSVC for ARM64's __umulh method. |
| * |
| * This compiles to the same MUL + UMULH as GCC/Clang's __uint128_t method. |
| */ |
| #elif defined(_M_ARM64) || defined(_M_ARM64EC) |
| |
| #ifndef _MSC_VER |
| #pragma intrinsic(__umulh) |
| #endif |
| XXH128_hash_t r128; |
| r128.low64 = lhs * rhs; |
| r128.high64 = __umulh(lhs, rhs); |
| return r128; |
| |
| #else |
| /* |
| * Portable scalar method. Optimized for 32-bit and 64-bit ALUs. |
| * |
| * This is a fast and simple grade school multiply, which is shown below |
| * with base 10 arithmetic instead of base 0x100000000. |
| * |
| * 9 3 // D2 lhs = 93 |
| * x 7 5 // D2 rhs = 75 |
| * ---------- |
| * 1 5 // D2 lo_lo = (93 % 10) * (75 % 10) = 15 |
| * 4 5 | // D2 hi_lo = (93 / 10) * (75 % 10) = 45 |
| * 2 1 | // D2 lo_hi = (93 % 10) * (75 / 10) = 21 |
| * + 6 3 | | // D2 hi_hi = (93 / 10) * (75 / 10) = 63 |
| * --------- |
| * 2 7 | // D2 cross = (15 / 10) + (45 % 10) + 21 = 27 |
| * + 6 7 | | // D2 upper = (27 / 10) + (45 / 10) + 63 = 67 |
| * --------- |
| * 6 9 7 5 // D4 res = (27 * 10) + (15 % 10) + (67 * 100) = 6975 |
| * |
| * The reasons for adding the products like this are: |
| * 1. It avoids manual carry tracking. Just like how |
| * (9 * 9) + 9 + 9 = 99, the same applies with this for UINT64_MAX. |
| * This avoids a lot of complexity. |
| * |
| * 2. It hints for, and on Clang, compiles to, the powerful UMAAL |
| * instruction available in ARM's Digital Signal Processing extension |
| * in 32-bit ARMv6 and later, which is shown below: |
| * |
| * void UMAAL(xxh_u32 *RdLo, xxh_u32 *RdHi, xxh_u32 Rn, xxh_u32 Rm) |
| * { |
| * uint64_t product = (uint64_t)*RdLo * (uint64_t)*RdHi + Rn + Rm; |
| * *RdLo = (xxh_u32)(product & 0xFFFFFFFF); |
| * *RdHi = (xxh_u32)(product >> 32); |
| * } |
| * |
| * This instruction was designed for efficient long multiplication, and |
| * allows this to be calculated in only 4 instructions at speeds |
| * comparable to some 64-bit ALUs. |
| * |
| * 3. It isn't terrible on other platforms. Usually this will be a couple |
| * of 32-bit ADD/ADCs. |
| */ |
| |
| /* First calculate all of the cross products. */ |
| uint64_t const lo_lo = XXH_mult32to64(lhs & 0xFFFFFFFF, rhs & 0xFFFFFFFF); |
| uint64_t const hi_lo = XXH_mult32to64(lhs >> 32, rhs & 0xFFFFFFFF); |
| uint64_t const lo_hi = XXH_mult32to64(lhs & 0xFFFFFFFF, rhs >> 32); |
| uint64_t const hi_hi = XXH_mult32to64(lhs >> 32, rhs >> 32); |
| |
| /* Now add the products together. These will never overflow. */ |
| uint64_t const cross = (lo_lo >> 32) + (hi_lo & 0xFFFFFFFF) + lo_hi; |
| uint64_t const upper = (hi_lo >> 32) + (cross >> 32) + hi_hi; |
| uint64_t const lower = (cross << 32) | (lo_lo & 0xFFFFFFFF); |
| |
| XXH128_hash_t r128; |
| r128.low64 = lower; |
| r128.high64 = upper; |
| return r128; |
| #endif |
| } |
| |
| /*! Seems to produce slightly better code on GCC for some reason. */ |
| LLVM_ATTRIBUTE_ALWAYS_INLINE constexpr uint64_t XXH_xorshift64(uint64_t v64, |
| int shift) { |
| return v64 ^ (v64 >> shift); |
| } |
| |
| LLVM_ATTRIBUTE_ALWAYS_INLINE static XXH128_hash_t |
| XXH3_len_1to3_128b(const uint8_t *input, size_t len, const uint8_t *secret, |
| uint64_t seed) { |
| /* A doubled version of 1to3_64b with different constants. */ |
| /* |
| * len = 1: combinedl = { input[0], 0x01, input[0], input[0] } |
| * len = 2: combinedl = { input[1], 0x02, input[0], input[1] } |
| * len = 3: combinedl = { input[2], 0x03, input[0], input[1] } |
| */ |
| uint8_t const c1 = input[0]; |
| uint8_t const c2 = input[len >> 1]; |
| uint8_t const c3 = input[len - 1]; |
| uint32_t const combinedl = ((uint32_t)c1 << 16) | ((uint32_t)c2 << 24) | |
| ((uint32_t)c3 << 0) | ((uint32_t)len << 8); |
| uint32_t const combinedh = XXH_rotl32(byteswap(combinedl), 13); |
| uint64_t const bitflipl = |
| (endian::read32le(secret) ^ endian::read32le(secret + 4)) + seed; |
| uint64_t const bitfliph = |
| (endian::read32le(secret + 8) ^ endian::read32le(secret + 12)) - seed; |
| uint64_t const keyed_lo = (uint64_t)combinedl ^ bitflipl; |
| uint64_t const keyed_hi = (uint64_t)combinedh ^ bitfliph; |
| XXH128_hash_t h128; |
| h128.low64 = XXH64_avalanche(keyed_lo); |
| h128.high64 = XXH64_avalanche(keyed_hi); |
| return h128; |
| } |
| |
| LLVM_ATTRIBUTE_ALWAYS_INLINE static XXH128_hash_t |
| XXH3_len_4to8_128b(const uint8_t *input, size_t len, const uint8_t *secret, |
| uint64_t seed) { |
| seed ^= (uint64_t)byteswap((uint32_t)seed) << 32; |
| uint32_t const input_lo = endian::read32le(input); |
| uint32_t const input_hi = endian::read32le(input + len - 4); |
| uint64_t const input_64 = input_lo + ((uint64_t)input_hi << 32); |
| uint64_t const bitflip = |
| (endian::read64le(secret + 16) ^ endian::read64le(secret + 24)) + seed; |
| uint64_t const keyed = input_64 ^ bitflip; |
| |
| /* Shift len to the left to ensure it is even, this avoids even multiplies. |
| */ |
| XXH128_hash_t m128 = XXH_mult64to128(keyed, PRIME64_1 + (len << 2)); |
| |
| m128.high64 += (m128.low64 << 1); |
| m128.low64 ^= (m128.high64 >> 3); |
| |
| m128.low64 = XXH_xorshift64(m128.low64, 35); |
| m128.low64 *= PRIME_MX2; |
| m128.low64 = XXH_xorshift64(m128.low64, 28); |
| m128.high64 = XXH3_avalanche(m128.high64); |
| return m128; |
| } |
| |
| LLVM_ATTRIBUTE_ALWAYS_INLINE static XXH128_hash_t |
| XXH3_len_9to16_128b(const uint8_t *input, size_t len, const uint8_t *secret, |
| uint64_t seed) { |
| uint64_t const bitflipl = |
| (endian::read64le(secret + 32) ^ endian::read64le(secret + 40)) - seed; |
| uint64_t const bitfliph = |
| (endian::read64le(secret + 48) ^ endian::read64le(secret + 56)) + seed; |
| uint64_t const input_lo = endian::read64le(input); |
| uint64_t input_hi = endian::read64le(input + len - 8); |
| XXH128_hash_t m128 = |
| XXH_mult64to128(input_lo ^ input_hi ^ bitflipl, PRIME64_1); |
| /* |
| * Put len in the middle of m128 to ensure that the length gets mixed to |
| * both the low and high bits in the 128x64 multiply below. |
| */ |
| m128.low64 += (uint64_t)(len - 1) << 54; |
| input_hi ^= bitfliph; |
| /* |
| * Add the high 32 bits of input_hi to the high 32 bits of m128, then |
| * add the long product of the low 32 bits of input_hi and PRIME32_2 to |
| * the high 64 bits of m128. |
| * |
| * The best approach to this operation is different on 32-bit and 64-bit. |
| */ |
| if (sizeof(void *) < sizeof(uint64_t)) { /* 32-bit */ |
| /* |
| * 32-bit optimized version, which is more readable. |
| * |
| * On 32-bit, it removes an ADC and delays a dependency between the two |
| * halves of m128.high64, but it generates an extra mask on 64-bit. |
| */ |
| m128.high64 += (input_hi & 0xFFFFFFFF00000000ULL) + |
| XXH_mult32to64((uint32_t)input_hi, PRIME32_2); |
| } else { |
| /* |
| * 64-bit optimized (albeit more confusing) version. |
| * |
| * Uses some properties of addition and multiplication to remove the mask: |
| * |
| * Let: |
| * a = input_hi.lo = (input_hi & 0x00000000FFFFFFFF) |
| * b = input_hi.hi = (input_hi & 0xFFFFFFFF00000000) |
| * c = PRIME32_2 |
| * |
| * a + (b * c) |
| * Inverse Property: x + y - x == y |
| * a + (b * (1 + c - 1)) |
| * Distributive Property: x * (y + z) == (x * y) + (x * z) |
| * a + (b * 1) + (b * (c - 1)) |
| * Identity Property: x * 1 == x |
| * a + b + (b * (c - 1)) |
| * |
| * Substitute a, b, and c: |
| * input_hi.hi + input_hi.lo + ((uint64_t)input_hi.lo * (PRIME32_2 |
| * - 1)) |
| * |
| * Since input_hi.hi + input_hi.lo == input_hi, we get this: |
| * input_hi + ((uint64_t)input_hi.lo * (PRIME32_2 - 1)) |
| */ |
| m128.high64 += input_hi + XXH_mult32to64((uint32_t)input_hi, PRIME32_2 - 1); |
| } |
| /* m128 ^= XXH_swap64(m128 >> 64); */ |
| m128.low64 ^= byteswap(m128.high64); |
| |
| /* 128x64 multiply: h128 = m128 * PRIME64_2; */ |
| XXH128_hash_t h128 = XXH_mult64to128(m128.low64, PRIME64_2); |
| h128.high64 += m128.high64 * PRIME64_2; |
| |
| h128.low64 = XXH3_avalanche(h128.low64); |
| h128.high64 = XXH3_avalanche(h128.high64); |
| return h128; |
| } |
| |
| /* |
| * Assumption: `secret` size is >= XXH3_SECRET_SIZE_MIN |
| */ |
| LLVM_ATTRIBUTE_ALWAYS_INLINE static XXH128_hash_t |
| XXH3_len_0to16_128b(const uint8_t *input, size_t len, const uint8_t *secret, |
| uint64_t seed) { |
| if (len > 8) |
| return XXH3_len_9to16_128b(input, len, secret, seed); |
| if (len >= 4) |
| return XXH3_len_4to8_128b(input, len, secret, seed); |
| if (len) |
| return XXH3_len_1to3_128b(input, len, secret, seed); |
| XXH128_hash_t h128; |
| uint64_t const bitflipl = |
| endian::read64le(secret + 64) ^ endian::read64le(secret + 72); |
| uint64_t const bitfliph = |
| endian::read64le(secret + 80) ^ endian::read64le(secret + 88); |
| h128.low64 = XXH64_avalanche(seed ^ bitflipl); |
| h128.high64 = XXH64_avalanche(seed ^ bitfliph); |
| return h128; |
| } |
| |
| /* |
| * A bit slower than XXH3_mix16B, but handles multiply by zero better. |
| */ |
| LLVM_ATTRIBUTE_ALWAYS_INLINE static XXH128_hash_t |
| XXH128_mix32B(XXH128_hash_t acc, const uint8_t *input_1, const uint8_t *input_2, |
| const uint8_t *secret, uint64_t seed) { |
| acc.low64 += XXH3_mix16B(input_1, secret + 0, seed); |
| acc.low64 ^= endian::read64le(input_2) + endian::read64le(input_2 + 8); |
| acc.high64 += XXH3_mix16B(input_2, secret + 16, seed); |
| acc.high64 ^= endian::read64le(input_1) + endian::read64le(input_1 + 8); |
| return acc; |
| } |
| |
| LLVM_ATTRIBUTE_ALWAYS_INLINE static XXH128_hash_t |
| XXH3_len_17to128_128b(const uint8_t *input, size_t len, const uint8_t *secret, |
| size_t secretSize, uint64_t seed) { |
| (void)secretSize; |
| |
| XXH128_hash_t acc; |
| acc.low64 = len * PRIME64_1; |
| acc.high64 = 0; |
| |
| if (len > 32) { |
| if (len > 64) { |
| if (len > 96) { |
| acc = |
| XXH128_mix32B(acc, input + 48, input + len - 64, secret + 96, seed); |
| } |
| acc = XXH128_mix32B(acc, input + 32, input + len - 48, secret + 64, seed); |
| } |
| acc = XXH128_mix32B(acc, input + 16, input + len - 32, secret + 32, seed); |
| } |
| acc = XXH128_mix32B(acc, input, input + len - 16, secret, seed); |
| XXH128_hash_t h128; |
| h128.low64 = acc.low64 + acc.high64; |
| h128.high64 = (acc.low64 * PRIME64_1) + (acc.high64 * PRIME64_4) + |
| ((len - seed) * PRIME64_2); |
| h128.low64 = XXH3_avalanche(h128.low64); |
| h128.high64 = (uint64_t)0 - XXH3_avalanche(h128.high64); |
| return h128; |
| } |
| |
| LLVM_ATTRIBUTE_NOINLINE static XXH128_hash_t |
| XXH3_len_129to240_128b(const uint8_t *input, size_t len, const uint8_t *secret, |
| size_t secretSize, uint64_t seed) { |
| (void)secretSize; |
| |
| XXH128_hash_t acc; |
| unsigned i; |
| acc.low64 = len * PRIME64_1; |
| acc.high64 = 0; |
| /* |
| * We set as `i` as offset + 32. We do this so that unchanged |
| * `len` can be used as upper bound. This reaches a sweet spot |
| * where both x86 and aarch64 get simple agen and good codegen |
| * for the loop. |
| */ |
| for (i = 32; i < 160; i += 32) { |
| acc = XXH128_mix32B(acc, input + i - 32, input + i - 16, secret + i - 32, |
| seed); |
| } |
| acc.low64 = XXH3_avalanche(acc.low64); |
| acc.high64 = XXH3_avalanche(acc.high64); |
| /* |
| * NB: `i <= len` will duplicate the last 32-bytes if |
| * len % 32 was zero. This is an unfortunate necessity to keep |
| * the hash result stable. |
| */ |
| for (i = 160; i <= len; i += 32) { |
| acc = XXH128_mix32B(acc, input + i - 32, input + i - 16, |
| secret + XXH3_MIDSIZE_STARTOFFSET + i - 160, seed); |
| } |
| /* last bytes */ |
| acc = |
| XXH128_mix32B(acc, input + len - 16, input + len - 32, |
| secret + XXH3_SECRETSIZE_MIN - XXH3_MIDSIZE_LASTOFFSET - 16, |
| (uint64_t)0 - seed); |
| |
| XXH128_hash_t h128; |
| h128.low64 = acc.low64 + acc.high64; |
| h128.high64 = (acc.low64 * PRIME64_1) + (acc.high64 * PRIME64_4) + |
| ((len - seed) * PRIME64_2); |
| h128.low64 = XXH3_avalanche(h128.low64); |
| h128.high64 = (uint64_t)0 - XXH3_avalanche(h128.high64); |
| return h128; |
| } |
| |
| LLVM_ATTRIBUTE_ALWAYS_INLINE XXH128_hash_t |
| XXH3_hashLong_128b(const uint8_t *input, size_t len, const uint8_t *secret, |
| size_t secretSize) { |
| const size_t nbStripesPerBlock = |
| (secretSize - XXH_STRIPE_LEN) / XXH_SECRET_CONSUME_RATE; |
| const size_t block_len = XXH_STRIPE_LEN * nbStripesPerBlock; |
| const size_t nb_blocks = (len - 1) / block_len; |
| alignas(16) uint64_t acc[XXH_ACC_NB] = { |
| PRIME32_3, PRIME64_1, PRIME64_2, PRIME64_3, |
| PRIME64_4, PRIME32_2, PRIME64_5, PRIME32_1, |
| }; |
| |
| for (size_t n = 0; n < nb_blocks; ++n) { |
| XXH3_accumulate(acc, input + n * block_len, secret, nbStripesPerBlock); |
| XXH3_scrambleAcc(acc, secret + secretSize - XXH_STRIPE_LEN); |
| } |
| |
| /* last partial block */ |
| const size_t nbStripes = (len - 1 - (block_len * nb_blocks)) / XXH_STRIPE_LEN; |
| assert(nbStripes <= secretSize / XXH_SECRET_CONSUME_RATE); |
| XXH3_accumulate(acc, input + nb_blocks * block_len, secret, nbStripes); |
| |
| /* last stripe */ |
| constexpr size_t XXH_SECRET_LASTACC_START = 7; |
| XXH3_accumulate_512(acc, input + len - XXH_STRIPE_LEN, |
| secret + secretSize - XXH_STRIPE_LEN - |
| XXH_SECRET_LASTACC_START); |
| |
| /* converge into final hash */ |
| static_assert(sizeof(acc) == 64); |
| XXH128_hash_t h128; |
| constexpr size_t XXH_SECRET_MERGEACCS_START = 11; |
| h128.low64 = XXH3_mergeAccs(acc, secret + XXH_SECRET_MERGEACCS_START, |
| (uint64_t)len * PRIME64_1); |
| h128.high64 = XXH3_mergeAccs( |
| acc, secret + secretSize - sizeof(acc) - XXH_SECRET_MERGEACCS_START, |
| ~((uint64_t)len * PRIME64_2)); |
| return h128; |
| } |
| |
| llvm::XXH128_hash_t llvm::xxh3_128bits(ArrayRef<uint8_t> data) { |
| size_t len = data.size(); |
| const uint8_t *input = data.data(); |
| |
| /* |
| * If an action is to be taken if `secret` conditions are not respected, |
| * it should be done here. |
| * For now, it's a contract pre-condition. |
| * Adding a check and a branch here would cost performance at every hash. |
| */ |
| if (len <= 16) |
| return XXH3_len_0to16_128b(input, len, kSecret, /*seed64=*/0); |
| if (len <= 128) |
| return XXH3_len_17to128_128b(input, len, kSecret, sizeof(kSecret), |
| /*seed64=*/0); |
| if (len <= XXH3_MIDSIZE_MAX) |
| return XXH3_len_129to240_128b(input, len, kSecret, sizeof(kSecret), |
| /*seed64=*/0); |
| return XXH3_hashLong_128b(input, len, kSecret, sizeof(kSecret)); |
| } |