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| -rw-r--r-- | lib/profile/xxhash.c | 138 | ||||
| -rw-r--r-- | lib/profile/xxhash.h | 47 |
2 files changed, 185 insertions, 0 deletions
diff --git a/lib/profile/xxhash.c b/lib/profile/xxhash.c new file mode 100644 index 000000000..e9dceed2c --- /dev/null +++ b/lib/profile/xxhash.c @@ -0,0 +1,138 @@ +/* +* xxHash - Fast Hash algorithm +* Copyright (C) 2012-2016, 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 +*/ + +/* based on revision d2df04efcbef7d7f6886d345861e5dfda4edacc1 Removed + * everything but a simple interface for computing XXh64. */ + +#include "llvm/Support/xxhash.h" +#include "llvm/Support/Endian.h" + +#include <stdlib.h> +#include <string.h> + +using namespace llvm; +using namespace support; + +static uint64_t rotl64(uint64_t X, size_t R) { + return (X << R) | (X >> (64 - R)); +} + +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; +} + +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 (P + 8 <= BEnd) { + uint64_t const K1 = round(0, endian::read64le(P)); + H64 ^= K1; + H64 = rotl64(H64, 27) * PRIME64_1 + PRIME64_4; + P += 8; + } + + if (P + 4 <= 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++; + } + + H64 ^= H64 >> 33; + H64 *= PRIME64_2; + H64 ^= H64 >> 29; + H64 *= PRIME64_3; + H64 ^= H64 >> 32; + + return H64; +} + +uint64_t llvm::xxHash64(ArrayRef<uint8_t> Data) { + return xxHash64({(const char *)Data.data(), Data.size()}); +} diff --git a/lib/profile/xxhash.h b/lib/profile/xxhash.h new file mode 100644 index 000000000..85fc66606 --- /dev/null +++ b/lib/profile/xxhash.h @@ -0,0 +1,47 @@ +/* + xxHash - Extremely Fast Hash algorithm + Header File + Copyright (C) 2012-2016, 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 source repository : https://github.com/Cyan4973/xxHash +*/ + +/* based on revision d2df04efcbef7d7f6886d345861e5dfda4edacc1 Removed + * everything but a simple interface for computing XXh64. */ + +#ifndef PROFILE_XXHASH_H_ +#define PROFILE_XXHASH_H_ + +#include "llvm/ADT/ArrayRef.h" +#include "llvm/ADT/StringRef.h" + +uint64_t xxHash64(llvm::StringRef Data); +uint64_t xxHash64(llvm::ArrayRef<uint8_t> Data); + +#endif |