mirror of
https://github.com/FEX-Emu/xxHash.git
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7ea2940fd6
- Trailing comma in enum in xxhsum.c - Extra semicolon - Non-constant brace list initializers
2257 lines
89 KiB
C
2257 lines
89 KiB
C
/*
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* xxHash - Extremely Fast Hash algorithm
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* Development source file for `xxh3`
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* Copyright (C) 2019-2020 Yann Collet
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*
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* BSD 2-Clause License (https://www.opensource.org/licenses/bsd-license.php)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You can contact the author at:
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* - xxHash homepage: https://www.xxhash.com
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* - xxHash source repository: https://github.com/Cyan4973/xxHash
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*/
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/*
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* Note: This file is separated for development purposes.
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* It will be integrated into `xxhash.h` when development stage is completed.
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*
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* Credit: most of the work on vectorial and asm variants comes from @easyaspi314
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*/
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#ifndef XXH3_H_1397135465
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#define XXH3_H_1397135465
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/* === Dependencies === */
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#ifndef XXHASH_H_5627135585666179
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/* special: when including `xxh3.h` directly, turn on XXH_INLINE_ALL */
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# undef XXH_INLINE_ALL /* avoid redefinition */
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# define XXH_INLINE_ALL
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#endif
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#include "xxhash.h"
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/* === Compiler specifics === */
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#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* >= C99 */
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# define XXH_RESTRICT restrict
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#else
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/* Note: it might be useful to define __restrict or __restrict__ for some C++ compilers */
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# define XXH_RESTRICT /* disable */
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#endif
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#if (defined(__GNUC__) && (__GNUC__ >= 3)) \
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|| (defined(__INTEL_COMPILER) && (__INTEL_COMPILER >= 800)) \
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|| defined(__clang__)
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# define XXH_likely(x) __builtin_expect(x, 1)
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# define XXH_unlikely(x) __builtin_expect(x, 0)
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#else
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# define XXH_likely(x) (x)
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# define XXH_unlikely(x) (x)
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#endif
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#if defined(__GNUC__)
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# if defined(__AVX2__)
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# include <immintrin.h>
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# elif defined(__SSE2__)
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# include <emmintrin.h>
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# elif defined(__ARM_NEON__) || defined(__ARM_NEON)
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# define inline __inline__ /* clang bug */
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# include <arm_neon.h>
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# undef inline
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# endif
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#elif defined(_MSC_VER)
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# include <intrin.h>
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#endif
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/*
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* One goal of XXH3 is to make it fast on both 32-bit and 64-bit, while
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* remaining a true 64-bit/128-bit hash function.
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*
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* This is done by prioritizing a subset of 64-bit operations that can be
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* emulated without too many steps on the average 32-bit machine.
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*
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* For example, these two lines seem similar, and run equally fast on 64-bit:
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*
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* xxh_u64 x;
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* x ^= (x >> 47); // good
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* x ^= (x >> 13); // bad
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*
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* However, to a 32-bit machine, there is a major difference.
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*
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* x ^= (x >> 47) looks like this:
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*
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* x.lo ^= (x.hi >> (47 - 32));
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*
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* while x ^= (x >> 13) looks like this:
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*
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* // note: funnel shifts are not usually cheap.
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* x.lo ^= (x.lo >> 13) | (x.hi << (32 - 13));
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* x.hi ^= (x.hi >> 13);
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*
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* The first one is significantly faster than the second, simply because the
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* shift is larger than 32. This means:
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* - All the bits we need are in the upper 32 bits, so we can ignore the lower
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* 32 bits in the shift.
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* - The shift result will always fit in the lower 32 bits, and therefore,
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* we can ignore the upper 32 bits in the xor.
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*
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* Thanks to this optimization, XXH3 only requires these features to be efficient:
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*
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* - Usable unaligned access
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* - A 32-bit or 64-bit ALU
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* - If 32-bit, a decent ADC instruction
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* - A 32 or 64-bit multiply with a 64-bit result
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* - For the 128-bit variant, a decent byteswap helps short inputs.
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*
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* The first two are already required by XXH32, and almost all 32-bit and 64-bit
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* platforms which can run XXH32 can run XXH3 efficiently.
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*
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* Thumb-1, the classic 16-bit only subset of ARM's instruction set, is one
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* notable exception.
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*
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* First of all, Thumb-1 lacks support for the UMULL instruction which
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* performs the important long multiply. This means numerous __aeabi_lmul
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* calls.
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*
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* Second of all, the 8 functional registers are just not enough.
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* Setup for __aeabi_lmul, byteshift loads, pointers, and all arithmetic need
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* Lo registers, and this shuffling results in thousands more MOVs than A32.
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*
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* A32 and T32 don't have this limitation. They can access all 14 registers,
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* do a 32->64 multiply with UMULL, and the flexible operand allowing free
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* shifts is helpful, too.
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*
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* Therefore, we do a quick sanity check.
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*
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* If compiling Thumb-1 for a target which supports ARM instructions, we will
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* emit a warning, as it is not a "sane" platform to compile for.
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*
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* Usually, if this happens, it is because of an accident and you probably need
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* to specify -march, as you likely meant to compile for a newer architecture.
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*/
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#if defined(__thumb__) && !defined(__thumb2__) && defined(__ARM_ARCH_ISA_ARM)
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# warning "XXH3 is highly inefficient without ARM or Thumb-2."
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#endif
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/* ==========================================
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* Vectorization detection
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* ========================================== */
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#define XXH_SCALAR 0 /* Portable scalar version */
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#define XXH_SSE2 1 /* SSE2 for Pentium 4 and all x86_64 */
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#define XXH_AVX2 2 /* AVX2 for Haswell and Bulldozer */
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#define XXH_NEON 3 /* NEON for most ARMv7-A and all AArch64 */
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#define XXH_VSX 4 /* VSX and ZVector for POWER8/z13 */
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#ifndef XXH_VECTOR /* can be defined on command line */
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# if defined(__AVX2__)
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# define XXH_VECTOR XXH_AVX2
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# elif defined(__SSE2__) || defined(_M_AMD64) || defined(_M_X64) || (defined(_M_IX86_FP) && (_M_IX86_FP == 2))
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# define XXH_VECTOR XXH_SSE2
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# elif defined(__GNUC__) /* msvc support maybe later */ \
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&& (defined(__ARM_NEON__) || defined(__ARM_NEON)) \
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&& (defined(__LITTLE_ENDIAN__) /* We only support little endian NEON */ \
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|| (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__))
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# define XXH_VECTOR XXH_NEON
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# elif (defined(__PPC64__) && defined(__POWER8_VECTOR__)) \
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|| (defined(__s390x__) && defined(__VEC__)) \
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&& defined(__GNUC__) /* TODO: IBM XL */
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# define XXH_VECTOR XXH_VSX
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# else
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# define XXH_VECTOR XXH_SCALAR
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# endif
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#endif
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/*
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* Controls the alignment of the accumulator.
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* This is for compatibility with aligned vector loads, which are usually faster.
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*/
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#ifndef XXH_ACC_ALIGN
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# if XXH_VECTOR == XXH_SCALAR /* scalar */
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# define XXH_ACC_ALIGN 8
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# elif XXH_VECTOR == XXH_SSE2 /* sse2 */
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# define XXH_ACC_ALIGN 16
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# elif XXH_VECTOR == XXH_AVX2 /* avx2 */
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# define XXH_ACC_ALIGN 32
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# elif XXH_VECTOR == XXH_NEON /* neon */
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# define XXH_ACC_ALIGN 16
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# elif XXH_VECTOR == XXH_VSX /* vsx */
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# define XXH_ACC_ALIGN 16
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# endif
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#endif
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/*
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* UGLY HACK:
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* GCC usually generates the best code with -O3 for xxHash.
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*
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* However, when targeting AVX2, it is overzealous in its unrolling resulting
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* in code roughly 3/4 the speed of Clang.
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*
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* There are other issues, such as GCC splitting _mm256_loadu_si256 into
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* _mm_loadu_si128 + _mm256_inserti128_si256. This is an optimization which
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* only applies to Sandy and Ivy Bridge... which don't even support AVX2.
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*
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* That is why when compiling the AVX2 version, it is recommended to use either
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* -O2 -mavx2 -march=haswell
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* or
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* -O2 -mavx2 -mno-avx256-split-unaligned-load
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* for decent performance, or to use Clang instead.
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*
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* Fortunately, we can control the first one with a pragma that forces GCC into
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* -O2, but the other one we can't control without "failed to inline always
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* inline function due to target mismatch" warnings.
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*/
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#if XXH_VECTOR == XXH_AVX2 /* AVX2 */ \
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&& defined(__GNUC__) && !defined(__clang__) /* GCC, not Clang */ \
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&& defined(__OPTIMIZE__) && !defined(__OPTIMIZE_SIZE__) /* respect -O0 and -Os */
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# pragma GCC push_options
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# pragma GCC optimize("-O2")
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#endif
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#if XXH_VECTOR == XXH_NEON
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/*
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* NEON's setup for vmlal_u32 is a little more complicated than it is on
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* SSE2, AVX2, and VSX.
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*
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* While PMULUDQ and VMULEUW both perform a mask, VMLAL.U32 performs an upcast.
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*
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* To do the same operation, the 128-bit 'Q' register needs to be split into
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* two 64-bit 'D' registers, performing this operation::
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*
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* [ a | b ]
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* | '---------. .--------' |
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* | x |
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* | .---------' '--------. |
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* [ a & 0xFFFFFFFF | b & 0xFFFFFFFF ],[ a >> 32 | b >> 32 ]
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*
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* Due to significant changes in aarch64, the fastest method for aarch64 is
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* completely different than the fastest method for ARMv7-A.
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*
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* ARMv7-A treats D registers as unions overlaying Q registers, so modifying
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* D11 will modify the high half of Q5. This is similar to how modifying AH
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* will only affect bits 8-15 of AX on x86.
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*
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* VZIP takes two registers, and puts even lanes in one register and odd lanes
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* in the other.
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*
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* On ARMv7-A, this strangely modifies both parameters in place instead of
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* taking the usual 3-operand form.
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*
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* Therefore, if we want to do this, we can simply use a D-form VZIP.32 on the
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* lower and upper halves of the Q register to end up with the high and low
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* halves where we want - all in one instruction.
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*
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* vzip.32 d10, d11 @ d10 = { d10[0], d11[0] }; d11 = { d10[1], d11[1] }
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*
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* Unfortunately we need inline assembly for this: Instructions modifying two
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* registers at once is not possible in GCC or Clang's IR, and they have to
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* create a copy.
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*
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* aarch64 requires a different approach.
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*
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* In order to make it easier to write a decent compiler for aarch64, many
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* quirks were removed, such as conditional execution.
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*
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* NEON was also affected by this.
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*
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* aarch64 cannot access the high bits of a Q-form register, and writes to a
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* D-form register zero the high bits, similar to how writes to W-form scalar
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* registers (or DWORD registers on x86_64) work.
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*
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* The formerly free vget_high intrinsics now require a vext (with a few
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* exceptions)
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*
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* Additionally, VZIP was replaced by ZIP1 and ZIP2, which are the equivalent
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* of PUNPCKL* and PUNPCKH* in SSE, respectively, in order to only modify one
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* operand.
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*
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* The equivalent of the VZIP.32 on the lower and upper halves would be this
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* mess:
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*
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* ext v2.4s, v0.4s, v0.4s, #2 // v2 = { v0[2], v0[3], v0[0], v0[1] }
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* zip1 v1.2s, v0.2s, v2.2s // v1 = { v0[0], v2[0] }
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* zip2 v0.2s, v0.2s, v1.2s // v0 = { v0[1], v2[1] }
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*
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* Instead, we use a literal downcast, vmovn_u64 (XTN), and vshrn_n_u64 (SHRN):
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*
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* shrn v1.2s, v0.2d, #32 // v1 = (uint32x2_t)(v0 >> 32);
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* xtn v0.2s, v0.2d // v0 = (uint32x2_t)(v0 & 0xFFFFFFFF);
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*
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* This is available on ARMv7-A, but is less efficient than a single VZIP.32.
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*/
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/*
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* Function-like macro:
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* void XXH_SPLIT_IN_PLACE(uint64x2_t &in, uint32x2_t &outLo, uint32x2_t &outHi)
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* {
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* outLo = (uint32x2_t)(in & 0xFFFFFFFF);
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* outHi = (uint32x2_t)(in >> 32);
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* in = UNDEFINED;
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* }
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*/
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# if !defined(XXH_NO_VZIP_HACK) /* define to disable */ \
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&& defined(__GNUC__) \
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&& !defined(__aarch64__) && !defined(__arm64__)
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# define XXH_SPLIT_IN_PLACE(in, outLo, outHi) \
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do { \
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/* Undocumented GCC/Clang operand modifier: %e0 = lower D half, %f0 = upper D half */ \
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/* https://github.com/gcc-mirror/gcc/blob/38cf91e5/gcc/config/arm/arm.c#L22486 */ \
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/* https://github.com/llvm-mirror/llvm/blob/2c4ca683/lib/Target/ARM/ARMAsmPrinter.cpp#L399 */ \
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__asm__("vzip.32 %e0, %f0" : "+w" (in)); \
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(outLo) = vget_low_u32 (vreinterpretq_u32_u64(in)); \
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(outHi) = vget_high_u32(vreinterpretq_u32_u64(in)); \
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} while (0)
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# else
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# define XXH_SPLIT_IN_PLACE(in, outLo, outHi) \
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do { \
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(outLo) = vmovn_u64 (in); \
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(outHi) = vshrn_n_u64 ((in), 32); \
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} while (0)
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# endif
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#endif /* XXH_VECTOR == XXH_NEON */
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/*
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* VSX and Z Vector helpers.
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*
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* This is very messy, and any pull requests to clean this up are welcome.
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*
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* There are a lot of problems with supporting VSX and s390x, due to
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* inconsistent intrinsics, spotty coverage, and multiple endiannesses.
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*/
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#if XXH_VECTOR == XXH_VSX
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# if defined(__s390x__)
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# include <s390intrin.h>
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# else
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# include <altivec.h>
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# endif
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# undef vector /* Undo the pollution */
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typedef __vector unsigned long long xxh_u64x2;
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typedef __vector unsigned char xxh_u8x16;
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typedef __vector unsigned xxh_u32x4;
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# ifndef XXH_VSX_BE
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# if defined(__BIG_ENDIAN__) \
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|| (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
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# define XXH_VSX_BE 1
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# elif defined(__VEC_ELEMENT_REG_ORDER__) && __VEC_ELEMENT_REG_ORDER__ == __ORDER_BIG_ENDIAN__
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# warning "-maltivec=be is not recommended. Please use native endianness."
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# define XXH_VSX_BE 1
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# else
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# define XXH_VSX_BE 0
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# endif
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# endif /* !defined(XXH_VSX_BE) */
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# if XXH_VSX_BE
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/* A wrapper for POWER9's vec_revb. */
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# if defined(__POWER9_VECTOR__) || (defined(__clang__) && defined(__s390x__))
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# define XXH_vec_revb vec_revb
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# else
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XXH_FORCE_INLINE xxh_u64x2 XXH_vec_revb(xxh_u64x2 val)
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{
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xxh_u8x16 const vByteSwap = { 0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
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0x0F, 0x0E, 0x0D, 0x0C, 0x0B, 0x0A, 0x09, 0x08 };
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return vec_perm(val, val, vByteSwap);
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}
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# endif
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# endif /* XXH_VSX_BE */
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/*
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* Performs an unaligned load and byte swaps it on big endian.
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*/
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XXH_FORCE_INLINE xxh_u64x2 XXH_vec_loadu(const void *ptr)
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{
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xxh_u64x2 ret;
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memcpy(&ret, ptr, sizeof(xxh_u64x2));
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# if XXH_VSX_BE
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ret = XXH_vec_revb(ret);
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# endif
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return ret;
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}
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/*
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* vec_mulo and vec_mule are very problematic intrinsics on PowerPC
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*
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* These intrinsics weren't added until GCC 8, despite existing for a while,
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* and they are endian dependent. Also, their meaning swap depending on version.
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* */
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# if defined(__s390x__)
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/* s390x is always big endian, no issue on this platform */
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# define XXH_vec_mulo vec_mulo
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# define XXH_vec_mule vec_mule
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# elif defined(__clang__) && __has_builtin(__builtin_altivec_vmuleuw)
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/* Clang has a better way to control this, we can just use the builtin which doesn't swap. */
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# define XXH_vec_mulo __builtin_altivec_vmulouw
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# define XXH_vec_mule __builtin_altivec_vmuleuw
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# else
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/* gcc needs inline assembly */
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/* Adapted from https://github.com/google/highwayhash/blob/master/highwayhash/hh_vsx.h. */
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XXH_FORCE_INLINE xxh_u64x2 XXH_vec_mulo(xxh_u32x4 a, xxh_u32x4 b)
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{
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xxh_u64x2 result;
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__asm__("vmulouw %0, %1, %2" : "=v" (result) : "v" (a), "v" (b));
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return result;
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}
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XXH_FORCE_INLINE xxh_u64x2 XXH_vec_mule(xxh_u32x4 a, xxh_u32x4 b)
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{
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xxh_u64x2 result;
|
|
__asm__("vmuleuw %0, %1, %2" : "=v" (result) : "v" (a), "v" (b));
|
|
return result;
|
|
}
|
|
# endif /* XXH_vec_mulo, XXH_vec_mule */
|
|
#endif /* XXH_VECTOR == XXH_VSX */
|
|
|
|
|
|
/* prefetch
|
|
* can be disabled, by declaring XXH_NO_PREFETCH build macro */
|
|
#if defined(XXH_NO_PREFETCH)
|
|
# define XXH_PREFETCH(ptr) (void)(ptr) /* disabled */
|
|
#else
|
|
# if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_I86)) /* _mm_prefetch() is not defined outside of x86/x64 */
|
|
# include <mmintrin.h> /* https://msdn.microsoft.com/fr-fr/library/84szxsww(v=vs.90).aspx */
|
|
# define XXH_PREFETCH(ptr) _mm_prefetch((const char*)(ptr), _MM_HINT_T0)
|
|
# elif defined(__GNUC__) && ( (__GNUC__ >= 4) || ( (__GNUC__ == 3) && (__GNUC_MINOR__ >= 1) ) )
|
|
# define XXH_PREFETCH(ptr) __builtin_prefetch((ptr), 0 /* rw==read */, 3 /* locality */)
|
|
# else
|
|
# define XXH_PREFETCH(ptr) (void)(ptr) /* disabled */
|
|
# endif
|
|
#endif /* XXH_NO_PREFETCH */
|
|
|
|
|
|
/* ==========================================
|
|
* XXH3 default settings
|
|
* ========================================== */
|
|
|
|
#define XXH_SECRET_DEFAULT_SIZE 192 /* minimum XXH3_SECRET_SIZE_MIN */
|
|
|
|
#if (XXH_SECRET_DEFAULT_SIZE < XXH3_SECRET_SIZE_MIN)
|
|
# error "default keyset is not large enough"
|
|
#endif
|
|
|
|
/* Pseudorandom secret taken directly from FARSH */
|
|
XXH_ALIGN(64) static const xxh_u8 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,
|
|
};
|
|
|
|
/*
|
|
* Calculates a 32-bit to 64-bit long multiply.
|
|
*
|
|
* Wraps __emulu on MSVC x86 because it tends to call __allmul when it doesn't
|
|
* need to (but it shouldn't need to anyways, it is about 7 instructions to do
|
|
* a 64x64 multiply...). Since we know that this will _always_ emit MULL, we
|
|
* use that instead of the normal method.
|
|
*
|
|
* If you are compiling for platforms like Thumb-1 and don't have a better option,
|
|
* you may also want to write your own long multiply routine here.
|
|
*
|
|
* XXH_FORCE_INLINE xxh_u64 XXH_mult32to64(xxh_u64 x, xxh_u64 y)
|
|
* {
|
|
* return (x & 0xFFFFFFFF) * (y & 0xFFFFFFFF);
|
|
* }
|
|
*/
|
|
#if defined(_MSC_VER) && defined(_M_IX86)
|
|
# include <intrin.h>
|
|
# define XXH_mult32to64(x, y) __emulu((unsigned)(x), (unsigned)(y))
|
|
#else
|
|
/*
|
|
* Downcast + upcast is usually better than masking on older compilers like
|
|
* GCC 4.2 (especially 32-bit ones), all without affecting newer compilers.
|
|
*
|
|
* The other method, (x & 0xFFFFFFFF) * (y & 0xFFFFFFFF), will AND both operands
|
|
* and perform a full 64x64 multiply -- entirely redundant on 32-bit.
|
|
*/
|
|
# define XXH_mult32to64(x, y) ((xxh_u64)(xxh_u32)(x) * (xxh_u64)(xxh_u32)(y))
|
|
#endif
|
|
|
|
/*
|
|
* Calculates a 64->128-bit long multiply.
|
|
*
|
|
* Uses __uint128_t and _umul128 if available, otherwise uses a scalar version.
|
|
*/
|
|
static XXH128_hash_t
|
|
XXH_mult64to128(xxh_u64 lhs, xxh_u64 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(__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 = (xxh_u64)(product);
|
|
r128.high64 = (xxh_u64)(product >> 64);
|
|
return r128;
|
|
|
|
/*
|
|
* MSVC for x64's _umul128 method.
|
|
*
|
|
* xxh_u64 _umul128(xxh_u64 Multiplier, xxh_u64 Multiplicand, xxh_u64 *HighProduct);
|
|
*
|
|
* This compiles to single operand MUL on x64.
|
|
*/
|
|
#elif defined(_M_X64) || defined(_M_IA64)
|
|
|
|
#ifndef _MSC_VER
|
|
# pragma intrinsic(_umul128)
|
|
#endif
|
|
xxh_u64 product_high;
|
|
xxh_u64 const product_low = _umul128(lhs, rhs, &product_high);
|
|
XXH128_hash_t r128;
|
|
r128.low64 = product_low;
|
|
r128.high64 = product_high;
|
|
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)
|
|
* {
|
|
* xxh_u64 product = (xxh_u64)*RdLo * (xxh_u64)*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. */
|
|
xxh_u64 const lo_lo = XXH_mult32to64(lhs & 0xFFFFFFFF, rhs & 0xFFFFFFFF);
|
|
xxh_u64 const hi_lo = XXH_mult32to64(lhs >> 32, rhs & 0xFFFFFFFF);
|
|
xxh_u64 const lo_hi = XXH_mult32to64(lhs & 0xFFFFFFFF, rhs >> 32);
|
|
xxh_u64 const hi_hi = XXH_mult32to64(lhs >> 32, rhs >> 32);
|
|
|
|
/* Now add the products together. These will never overflow. */
|
|
xxh_u64 const cross = (lo_lo >> 32) + (hi_lo & 0xFFFFFFFF) + lo_hi;
|
|
xxh_u64 const upper = (hi_lo >> 32) + (cross >> 32) + hi_hi;
|
|
xxh_u64 const lower = (cross << 32) | (lo_lo & 0xFFFFFFFF);
|
|
|
|
XXH128_hash_t r128;
|
|
r128.low64 = lower;
|
|
r128.high64 = upper;
|
|
return r128;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Does a 64-bit to 128-bit multiply, then XOR folds it.
|
|
*
|
|
* The reason for the separate function is to prevent passing too many structs
|
|
* around by value. This will hopefully inline the multiply, but we don't force it.
|
|
*/
|
|
static xxh_u64
|
|
XXH3_mul128_fold64(xxh_u64 lhs, xxh_u64 rhs)
|
|
{
|
|
XXH128_hash_t product = XXH_mult64to128(lhs, rhs);
|
|
return product.low64 ^ product.high64;
|
|
}
|
|
|
|
/* Seems to produce slightly better code on GCC for some reason. */
|
|
XXH_FORCE_INLINE xxh_u64 XXH_xorshift64(xxh_u64 v64, int shift)
|
|
{
|
|
XXH_ASSERT(0 <= shift && shift < 64);
|
|
return v64 ^ (v64 >> shift);
|
|
}
|
|
|
|
/*
|
|
* We don't need to (or want to) mix as much as XXH64.
|
|
*
|
|
* Short hashes are more evenly distributed, so it isn't necessary.
|
|
*/
|
|
static XXH64_hash_t XXH3_avalanche(xxh_u64 h64)
|
|
{
|
|
h64 = XXH_xorshift64(h64, 37);
|
|
h64 *= 0x165667919E3779F9ULL;
|
|
h64 = XXH_xorshift64(h64, 32);
|
|
return h64;
|
|
}
|
|
|
|
|
|
/* ==========================================
|
|
* Short keys
|
|
* ==========================================
|
|
* One of the shortcomings of XXH32 and XXH64 was that their performance was
|
|
* sub-optimal on short lengths. It used an iterative algorithm which strongly
|
|
* favored lengths that were a multiple of 4 or 8.
|
|
*
|
|
* Instead of iterating over individual inputs, we use a set of single shot
|
|
* functions which piece together a range of lengths and operate in constant time.
|
|
*
|
|
* Additionally, the number of multiplies has been significantly reduced. This
|
|
* reduces latency, especially when emulating 64-bit multiplies on 32-bit.
|
|
*
|
|
* Depending on the platform, this may or may not be faster than XXH32, but it
|
|
* is almost guaranteed to be faster than XXH64.
|
|
*/
|
|
|
|
/*
|
|
* At very short lengths, there isn't enough input to fully hide secrets, or use
|
|
* the entire secret.
|
|
*
|
|
* There is also only a limited amount of mixing we can do before significantly
|
|
* impacting performance.
|
|
*
|
|
* Therefore, we use different sections of the secret and always mix two secret
|
|
* samples with an XOR. This should have no effect on performance on the
|
|
* seedless or withSeed variants because everything _should_ be constant folded
|
|
* by modern compilers.
|
|
*
|
|
* The XOR mixing hides individual parts of the secret and increases entropy.
|
|
*
|
|
* This adds an extra layer of strength for custom secrets.
|
|
*/
|
|
XXH_FORCE_INLINE XXH64_hash_t
|
|
XXH3_len_1to3_64b(const xxh_u8* input, size_t len, const xxh_u8* secret, XXH64_hash_t seed)
|
|
{
|
|
XXH_ASSERT(input != NULL);
|
|
XXH_ASSERT(1 <= len && len <= 3);
|
|
XXH_ASSERT(secret != NULL);
|
|
/*
|
|
* len = 1: combined = { input[0], 0x01, input[0], input[0] }
|
|
* len = 2: combined = { input[1], 0x02, input[0], input[1] }
|
|
* len = 3: combined = { input[2], 0x03, input[0], input[1] }
|
|
*/
|
|
{ xxh_u8 const c1 = input[0];
|
|
xxh_u8 const c2 = input[len >> 1];
|
|
xxh_u8 const c3 = input[len - 1];
|
|
xxh_u32 const combined = ((xxh_u32)c1 << 16) | ((xxh_u32)c2 << 24)
|
|
| ((xxh_u32)c3 << 0) | ((xxh_u32)len << 8);
|
|
xxh_u64 const bitflip = (XXH_readLE32(secret) ^ XXH_readLE32(secret+4)) + seed;
|
|
xxh_u64 const keyed = (xxh_u64)combined ^ bitflip;
|
|
xxh_u64 const mixed = keyed * PRIME64_1;
|
|
return XXH3_avalanche(mixed);
|
|
}
|
|
}
|
|
|
|
XXH_FORCE_INLINE XXH64_hash_t
|
|
XXH3_len_4to8_64b(const xxh_u8* input, size_t len, const xxh_u8* secret, XXH64_hash_t seed)
|
|
{
|
|
XXH_ASSERT(input != NULL);
|
|
XXH_ASSERT(secret != NULL);
|
|
XXH_ASSERT(4 <= len && len < 8);
|
|
seed ^= (xxh_u64)XXH_swap32((xxh_u32)seed) << 32;
|
|
{ xxh_u32 const input1 = XXH_readLE32(input);
|
|
xxh_u32 const input2 = XXH_readLE32(input + len - 4);
|
|
xxh_u64 const bitflip = (XXH_readLE64(secret+8) ^ XXH_readLE64(secret+16)) - seed;
|
|
xxh_u64 const input64 = input2 + (((xxh_u64)input1) << 32);
|
|
xxh_u64 x = input64 ^ bitflip;
|
|
/* this mix is inspired by Pelle Evensen's rrmxmx */
|
|
x ^= XXH_rotl64(x, 49) ^ XXH_rotl64(x, 24);
|
|
x *= 0x9FB21C651E98DF25ULL;
|
|
x ^= (x >> 35) + len ;
|
|
x *= 0x9FB21C651E98DF25ULL;
|
|
return XXH_xorshift64(x, 28);
|
|
}
|
|
}
|
|
|
|
XXH_FORCE_INLINE XXH64_hash_t
|
|
XXH3_len_9to16_64b(const xxh_u8* input, size_t len, const xxh_u8* secret, XXH64_hash_t seed)
|
|
{
|
|
XXH_ASSERT(input != NULL);
|
|
XXH_ASSERT(secret != NULL);
|
|
XXH_ASSERT(8 <= len && len <= 16);
|
|
{ xxh_u64 const bitflip1 = (XXH_readLE64(secret+24) ^ XXH_readLE64(secret+32)) + seed;
|
|
xxh_u64 const bitflip2 = (XXH_readLE64(secret+40) ^ XXH_readLE64(secret+48)) - seed;
|
|
xxh_u64 const input_lo = XXH_readLE64(input) ^ bitflip1;
|
|
xxh_u64 const input_hi = XXH_readLE64(input + len - 8) ^ bitflip2;
|
|
xxh_u64 const acc = len
|
|
+ XXH_swap64(input_lo) + input_hi
|
|
+ XXH3_mul128_fold64(input_lo, input_hi);
|
|
return XXH3_avalanche(acc);
|
|
}
|
|
}
|
|
|
|
XXH_FORCE_INLINE XXH64_hash_t
|
|
XXH3_len_0to16_64b(const xxh_u8* input, size_t len, const xxh_u8* secret, XXH64_hash_t seed)
|
|
{
|
|
XXH_ASSERT(len <= 16);
|
|
{ if (XXH_likely(len > 8)) return XXH3_len_9to16_64b(input, len, secret, seed);
|
|
if (XXH_likely(len >= 4)) return XXH3_len_4to8_64b(input, len, secret, seed);
|
|
if (len) return XXH3_len_1to3_64b(input, len, secret, seed);
|
|
return XXH3_avalanche((PRIME64_1 + seed) ^ (XXH_readLE64(secret+56) ^ XXH_readLE64(secret+64)));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* DISCLAIMER: There are known *seed-dependent* multicollisions here due to
|
|
* multiplication by zero, affecting hashes of lengths 17 to 240.
|
|
*
|
|
* However, they are very unlikely.
|
|
*
|
|
* Keep this in mind when using the unseeded XXH3_64bits() variant: As with all
|
|
* unseeded non-cryptographic hashes, it does not attempt to defend itself
|
|
* against specially crafted inputs, only random inputs.
|
|
*
|
|
* Compared to classic UMAC where a 1 in 2^31 chance of 4 consecutive bytes
|
|
* cancelling out the secret is taken an arbitrary number of times (addressed
|
|
* in XXH3_accumulate_512), this collision is very unlikely with random inputs
|
|
* and/or proper seeding:
|
|
*
|
|
* This only has a 1 in 2^63 chance of 8 consecutive bytes cancelling out, in a
|
|
* function that is only called up to 16 times per hash with up to 240 bytes of
|
|
* input.
|
|
*
|
|
* This is not too bad for a non-cryptographic hash function, especially with
|
|
* only 64 bit outputs.
|
|
*
|
|
* The 128-bit variant (which trades some speed for strength) is NOT affected
|
|
* by this, although it is always a good idea to use a proper seed if you care
|
|
* about strength.
|
|
*/
|
|
XXH_FORCE_INLINE xxh_u64 XXH3_mix16B(const xxh_u8* XXH_RESTRICT input,
|
|
const xxh_u8* XXH_RESTRICT secret, xxh_u64 seed64)
|
|
{
|
|
#if defined(__GNUC__) && !defined(__clang__) /* GCC, not Clang */ \
|
|
&& defined(__i386__) && defined(__SSE2__) /* x86 + SSE2 */ \
|
|
&& !defined(XXH_ENABLE_AUTOVECTORIZE) /* Define to disable like XXH32 hack */
|
|
/*
|
|
* UGLY HACK:
|
|
* GCC for x86 tends to autovectorize the 128-bit multiply, resulting in
|
|
* slower code.
|
|
*
|
|
* By forcing seed64 into a register, we disrupt the cost model and
|
|
* cause it to scalarize. See `XXH32_round()`
|
|
*
|
|
* FIXME: Clang's output is still _much_ faster -- On an AMD Ryzen 3600,
|
|
* XXH3_64bits @ len=240 runs at 4.6 GB/s with Clang 9, but 3.3 GB/s on
|
|
* GCC 9.2, despite both emitting scalar code.
|
|
*
|
|
* GCC generates much better scalar code than Clang for the rest of XXH3,
|
|
* which is why finding a more optimal codepath is an interest.
|
|
*/
|
|
__asm__ ("" : "+r" (seed64));
|
|
#endif
|
|
{ xxh_u64 const input_lo = XXH_readLE64(input);
|
|
xxh_u64 const input_hi = XXH_readLE64(input+8);
|
|
return XXH3_mul128_fold64(
|
|
input_lo ^ (XXH_readLE64(secret) + seed64),
|
|
input_hi ^ (XXH_readLE64(secret+8) - seed64)
|
|
);
|
|
}
|
|
}
|
|
|
|
/* For mid range keys, XXH3 uses a Mum-hash variant. */
|
|
XXH_FORCE_INLINE XXH64_hash_t
|
|
XXH3_len_17to128_64b(const xxh_u8* XXH_RESTRICT input, size_t len,
|
|
const xxh_u8* XXH_RESTRICT secret, size_t secretSize,
|
|
XXH64_hash_t seed)
|
|
{
|
|
XXH_ASSERT(secretSize >= XXH3_SECRET_SIZE_MIN); (void)secretSize;
|
|
XXH_ASSERT(16 < len && len <= 128);
|
|
|
|
{ xxh_u64 acc = len * PRIME64_1;
|
|
if (len > 32) {
|
|
if (len > 64) {
|
|
if (len > 96) {
|
|
acc += XXH3_mix16B(input+48, secret+96, seed);
|
|
acc += XXH3_mix16B(input+len-64, secret+112, seed);
|
|
}
|
|
acc += XXH3_mix16B(input+32, secret+64, seed);
|
|
acc += XXH3_mix16B(input+len-48, secret+80, seed);
|
|
}
|
|
acc += XXH3_mix16B(input+16, secret+32, seed);
|
|
acc += XXH3_mix16B(input+len-32, secret+48, seed);
|
|
}
|
|
acc += XXH3_mix16B(input+0, secret+0, seed);
|
|
acc += XXH3_mix16B(input+len-16, secret+16, seed);
|
|
|
|
return XXH3_avalanche(acc);
|
|
}
|
|
}
|
|
|
|
#define XXH3_MIDSIZE_MAX 240
|
|
|
|
XXH_NO_INLINE XXH64_hash_t
|
|
XXH3_len_129to240_64b(const xxh_u8* XXH_RESTRICT input, size_t len,
|
|
const xxh_u8* XXH_RESTRICT secret, size_t secretSize,
|
|
XXH64_hash_t seed)
|
|
{
|
|
XXH_ASSERT(secretSize >= XXH3_SECRET_SIZE_MIN); (void)secretSize;
|
|
XXH_ASSERT(128 < len && len <= XXH3_MIDSIZE_MAX);
|
|
|
|
#define XXH3_MIDSIZE_STARTOFFSET 3
|
|
#define XXH3_MIDSIZE_LASTOFFSET 17
|
|
|
|
{ xxh_u64 acc = len * PRIME64_1;
|
|
int const nbRounds = (int)len / 16;
|
|
int i;
|
|
for (i=0; i<8; i++) {
|
|
acc += XXH3_mix16B(input+(16*i), secret+(16*i), seed);
|
|
}
|
|
acc = XXH3_avalanche(acc);
|
|
XXH_ASSERT(nbRounds >= 8);
|
|
#if defined(__clang__) /* Clang */ \
|
|
&& (defined(__ARM_NEON) || defined(__ARM_NEON__)) /* NEON */ \
|
|
&& !defined(XXH_ENABLE_AUTOVECTORIZE) /* Define to disable */
|
|
/*
|
|
* UGLY HACK:
|
|
* Clang for ARMv7-A tries to vectorize this loop, similar to GCC x86.
|
|
* In everywhere else, it uses scalar code.
|
|
*
|
|
* For 64->128-bit multiplies, even if the NEON was 100% optimal, it
|
|
* would still be slower than UMAAL (see XXH_mult64to128).
|
|
*
|
|
* Unfortunately, Clang doesn't handle the long multiplies properly and
|
|
* converts them to the nonexistent "vmulq_u64" intrinsic, which is then
|
|
* scalarized into an ugly mess of VMOV.32 instructions.
|
|
*
|
|
* This mess is difficult to avoid without turning autovectorization
|
|
* off completely, but they are usually relatively minor and/or not
|
|
* worth it to fix.
|
|
*
|
|
* This loop is the easiest to fix, as unlike XXH32, this pragma
|
|
* _actually works_ because it is a loop vectorization instead of an
|
|
* SLP vectorization.
|
|
*/
|
|
#pragma clang loop vectorize(disable)
|
|
#endif
|
|
for (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_SECRET_SIZE_MIN - XXH3_MIDSIZE_LASTOFFSET, seed);
|
|
return XXH3_avalanche(acc);
|
|
}
|
|
}
|
|
|
|
|
|
/* === Long Keys === */
|
|
|
|
#define STRIPE_LEN 64
|
|
#define XXH_SECRET_CONSUME_RATE 8 /* nb of secret bytes consumed at each accumulation */
|
|
#define ACC_NB (STRIPE_LEN / sizeof(xxh_u64))
|
|
|
|
typedef enum { XXH3_acc_64bits, XXH3_acc_128bits } XXH3_accWidth_e;
|
|
|
|
/*
|
|
* XXH3_accumulate_512 is the tightest loop for long inputs, and it is the most optimized.
|
|
*
|
|
* It is a hardened version of UMAC, based off of FARSH's implementation.
|
|
*
|
|
* This was chosen because it adapts quite well to 32-bit, 64-bit, and SIMD
|
|
* implementations, and it is ridiculously fast.
|
|
*
|
|
* We harden it by mixing the original input to the accumulators as well as the product.
|
|
*
|
|
* This means that in the (relatively likely) case of a multiply by zero, the
|
|
* original input is preserved.
|
|
*
|
|
* On 128-bit inputs, we swap 64-bit pairs when we add the input to improve
|
|
* cross-pollination, as otherwise the upper and lower halves would be
|
|
* essentially independent.
|
|
*
|
|
* This doesn't matter on 64-bit hashes since they all get merged together in
|
|
* the end, so we skip the extra step.
|
|
*
|
|
* Both XXH3_64bits and XXH3_128bits use this subroutine.
|
|
*/
|
|
XXH_FORCE_INLINE void
|
|
XXH3_accumulate_512( void* XXH_RESTRICT acc,
|
|
const void* XXH_RESTRICT input,
|
|
const void* XXH_RESTRICT secret,
|
|
XXH3_accWidth_e accWidth)
|
|
{
|
|
#if (XXH_VECTOR == XXH_AVX2)
|
|
|
|
XXH_ASSERT((((size_t)acc) & 31) == 0);
|
|
{ XXH_ALIGN(32) __m256i* const xacc = (__m256i *) acc;
|
|
/* Unaligned. This is mainly for pointer arithmetic, and because
|
|
* _mm256_loadu_si256 requires a const __m256i * pointer for some reason. */
|
|
const __m256i* const xinput = (const __m256i *) input;
|
|
/* Unaligned. This is mainly for pointer arithmetic, and because
|
|
* _mm256_loadu_si256 requires a const __m256i * pointer for some reason. */
|
|
const __m256i* const xsecret = (const __m256i *) secret;
|
|
|
|
size_t i;
|
|
for (i=0; i < STRIPE_LEN/sizeof(__m256i); i++) {
|
|
/* data_vec = xinput[i]; */
|
|
__m256i const data_vec = _mm256_loadu_si256 (xinput+i);
|
|
/* key_vec = xsecret[i]; */
|
|
__m256i const key_vec = _mm256_loadu_si256 (xsecret+i);
|
|
/* data_key = data_vec ^ key_vec; */
|
|
__m256i const data_key = _mm256_xor_si256 (data_vec, key_vec);
|
|
/* data_key_lo = data_key >> 32; */
|
|
__m256i const data_key_lo = _mm256_shuffle_epi32 (data_key, _MM_SHUFFLE(0, 3, 0, 1));
|
|
/* product = (data_key & 0xffffffff) * (data_key_lo & 0xffffffff); */
|
|
__m256i const product = _mm256_mul_epu32 (data_key, data_key_lo);
|
|
if (accWidth == XXH3_acc_128bits) {
|
|
/* xacc[i] += swap(data_vec); */
|
|
__m256i const data_swap = _mm256_shuffle_epi32(data_vec, _MM_SHUFFLE(1, 0, 3, 2));
|
|
__m256i const sum = _mm256_add_epi64(xacc[i], data_swap);
|
|
/* xacc[i] += product; */
|
|
xacc[i] = _mm256_add_epi64(product, sum);
|
|
} else { /* XXH3_acc_64bits */
|
|
/* xacc[i] += data_vec; */
|
|
__m256i const sum = _mm256_add_epi64(xacc[i], data_vec);
|
|
/* xacc[i] += product; */
|
|
xacc[i] = _mm256_add_epi64(product, sum);
|
|
}
|
|
} }
|
|
|
|
#elif (XXH_VECTOR == XXH_SSE2)
|
|
|
|
/* SSE2 is just a half-scale version of the AVX2 version. */
|
|
XXH_ASSERT((((size_t)acc) & 15) == 0);
|
|
{ XXH_ALIGN(16) __m128i* const xacc = (__m128i *) acc;
|
|
/* Unaligned. This is mainly for pointer arithmetic, and because
|
|
* _mm_loadu_si128 requires a const __m128i * pointer for some reason. */
|
|
const __m128i* const xinput = (const __m128i *) input;
|
|
/* Unaligned. This is mainly for pointer arithmetic, and because
|
|
* _mm_loadu_si128 requires a const __m128i * pointer for some reason. */
|
|
const __m128i* const xsecret = (const __m128i *) secret;
|
|
|
|
size_t i;
|
|
for (i=0; i < STRIPE_LEN/sizeof(__m128i); i++) {
|
|
/* data_vec = xinput[i]; */
|
|
__m128i const data_vec = _mm_loadu_si128 (xinput+i);
|
|
/* key_vec = xsecret[i]; */
|
|
__m128i const key_vec = _mm_loadu_si128 (xsecret+i);
|
|
/* data_key = data_vec ^ key_vec; */
|
|
__m128i const data_key = _mm_xor_si128 (data_vec, key_vec);
|
|
/* data_key_lo = data_key >> 32; */
|
|
__m128i const data_key_lo = _mm_shuffle_epi32 (data_key, _MM_SHUFFLE(0, 3, 0, 1));
|
|
/* product = (data_key & 0xffffffff) * (data_key_lo & 0xffffffff); */
|
|
__m128i const product = _mm_mul_epu32 (data_key, data_key_lo);
|
|
if (accWidth == XXH3_acc_128bits) {
|
|
/* xacc[i] += swap(data_vec); */
|
|
__m128i const data_swap = _mm_shuffle_epi32(data_vec, _MM_SHUFFLE(1,0,3,2));
|
|
__m128i const sum = _mm_add_epi64(xacc[i], data_swap);
|
|
/* xacc[i] += product; */
|
|
xacc[i] = _mm_add_epi64(product, sum);
|
|
} else { /* XXH3_acc_64bits */
|
|
/* xacc[i] += data_vec; */
|
|
__m128i const sum = _mm_add_epi64(xacc[i], data_vec);
|
|
/* xacc[i] += product; */
|
|
xacc[i] = _mm_add_epi64(product, sum);
|
|
}
|
|
} }
|
|
|
|
#elif (XXH_VECTOR == XXH_NEON)
|
|
|
|
XXH_ASSERT((((size_t)acc) & 15) == 0);
|
|
{
|
|
XXH_ALIGN(16) uint64x2_t* const xacc = (uint64x2_t *) acc;
|
|
/* We don't use a uint32x4_t pointer because it causes bus errors on ARMv7. */
|
|
uint8_t const* const xinput = (const uint8_t *) input;
|
|
uint8_t const* const xsecret = (const uint8_t *) secret;
|
|
|
|
size_t i;
|
|
for (i=0; i < STRIPE_LEN / sizeof(uint64x2_t); i++) {
|
|
/* data_vec = xinput[i]; */
|
|
uint8x16_t data_vec = vld1q_u8(xinput + (i * 16));
|
|
/* key_vec = xsecret[i]; */
|
|
uint8x16_t key_vec = vld1q_u8(xsecret + (i * 16));
|
|
/* data_key = data_vec ^ key_vec; */
|
|
uint64x2_t data_key = vreinterpretq_u64_u8(veorq_u8(data_vec, key_vec));
|
|
uint32x2_t data_key_lo, data_key_hi;
|
|
if (accWidth == XXH3_acc_64bits) {
|
|
/* xacc[i] += data_vec; */
|
|
xacc[i] = vaddq_u64 (xacc[i], vreinterpretq_u64_u8(data_vec));
|
|
} else { /* XXH3_acc_128bits */
|
|
/* xacc[i] += swap(data_vec); */
|
|
uint64x2_t const data64 = vreinterpretq_u64_u8(data_vec);
|
|
uint64x2_t const swapped = vextq_u64(data64, data64, 1);
|
|
xacc[i] = vaddq_u64 (xacc[i], swapped);
|
|
}
|
|
/* data_key_lo = (uint32x2_t) (data_key & 0xFFFFFFFF);
|
|
* data_key_hi = (uint32x2_t) (data_key >> 32);
|
|
* data_key = UNDEFINED; */
|
|
XXH_SPLIT_IN_PLACE(data_key, data_key_lo, data_key_hi);
|
|
/* xacc[i] += (uint64x2_t) data_key_lo * (uint64x2_t) data_key_hi; */
|
|
xacc[i] = vmlal_u32 (xacc[i], data_key_lo, data_key_hi);
|
|
|
|
}
|
|
}
|
|
|
|
#elif (XXH_VECTOR == XXH_VSX)
|
|
xxh_u64x2* const xacc = (xxh_u64x2*) acc; /* presumed aligned */
|
|
xxh_u64x2 const* const xinput = (xxh_u64x2 const*) input; /* no alignment restriction */
|
|
xxh_u64x2 const* const xsecret = (xxh_u64x2 const*) secret; /* no alignment restriction */
|
|
xxh_u64x2 const v32 = { 32, 32 };
|
|
size_t i;
|
|
for (i = 0; i < STRIPE_LEN / sizeof(xxh_u64x2); i++) {
|
|
/* data_vec = xinput[i]; */
|
|
xxh_u64x2 const data_vec = XXH_vec_loadu(xinput + i);
|
|
/* key_vec = xsecret[i]; */
|
|
xxh_u64x2 const key_vec = XXH_vec_loadu(xsecret + i);
|
|
xxh_u64x2 const data_key = data_vec ^ key_vec;
|
|
/* shuffled = (data_key << 32) | (data_key >> 32); */
|
|
xxh_u32x4 const shuffled = (xxh_u32x4)vec_rl(data_key, v32);
|
|
/* product = ((xxh_u64x2)data_key & 0xFFFFFFFF) * ((xxh_u64x2)shuffled & 0xFFFFFFFF); */
|
|
xxh_u64x2 const product = XXH_vec_mulo((xxh_u32x4)data_key, shuffled);
|
|
xacc[i] += product;
|
|
|
|
if (accWidth == XXH3_acc_64bits) {
|
|
xacc[i] += data_vec;
|
|
} else { /* XXH3_acc_128bits */
|
|
/* swap high and low halves */
|
|
#ifdef __s390x__
|
|
xxh_u64x2 const data_swapped = vec_permi(data_vec, data_vec, 2);
|
|
#else
|
|
xxh_u64x2 const data_swapped = vec_xxpermdi(data_vec, data_vec, 2);
|
|
#endif
|
|
xacc[i] += data_swapped;
|
|
}
|
|
}
|
|
|
|
#else /* scalar variant of Accumulator - universal */
|
|
|
|
XXH_ALIGN(XXH_ACC_ALIGN) xxh_u64* const xacc = (xxh_u64*) acc; /* presumed aligned */
|
|
const xxh_u8* const xinput = (const xxh_u8*) input; /* no alignment restriction */
|
|
const xxh_u8* const xsecret = (const xxh_u8*) secret; /* no alignment restriction */
|
|
size_t i;
|
|
XXH_ASSERT(((size_t)acc & (XXH_ACC_ALIGN-1)) == 0);
|
|
for (i=0; i < ACC_NB; i++) {
|
|
xxh_u64 const data_val = XXH_readLE64(xinput + 8*i);
|
|
xxh_u64 const data_key = data_val ^ XXH_readLE64(xsecret + i*8);
|
|
|
|
if (accWidth == XXH3_acc_64bits) {
|
|
xacc[i] += data_val;
|
|
} else {
|
|
xacc[i ^ 1] += data_val; /* swap adjacent lanes */
|
|
}
|
|
xacc[i] += XXH_mult32to64(data_key & 0xFFFFFFFF, data_key >> 32);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* XXH3_scrambleAcc: Scrambles the accumulators to improve mixing.
|
|
*
|
|
* Multiplication isn't perfect, as explained by Google in HighwayHash:
|
|
*
|
|
* // Multiplication mixes/scrambles bytes 0-7 of the 64-bit result to
|
|
* // varying degrees. In descending order of goodness, bytes
|
|
* // 3 4 2 5 1 6 0 7 have quality 228 224 164 160 100 96 36 32.
|
|
* // As expected, the upper and lower bytes are much worse.
|
|
*
|
|
* Source: https://github.com/google/highwayhash/blob/0aaf66b/highwayhash/hh_avx2.h#L291
|
|
*
|
|
* Since our algorithm uses a pseudorandom secret to add some variance into the
|
|
* mix, we don't need to (or want to) mix as often or as much as HighwayHash does.
|
|
*
|
|
* This isn't as tight as XXH3_accumulate, but still written in SIMD to avoid
|
|
* extraction.
|
|
*
|
|
* Both XXH3_64bits and XXH3_128bits use this subroutine.
|
|
*/
|
|
XXH_FORCE_INLINE void
|
|
XXH3_scrambleAcc(void* XXH_RESTRICT acc, const void* XXH_RESTRICT secret)
|
|
{
|
|
#if (XXH_VECTOR == XXH_AVX2)
|
|
|
|
XXH_ASSERT((((size_t)acc) & 31) == 0);
|
|
{ XXH_ALIGN(32) __m256i* const xacc = (__m256i*) acc;
|
|
/* Unaligned. This is mainly for pointer arithmetic, and because
|
|
* _mm256_loadu_si256 requires a const __m256i * pointer for some reason. */
|
|
const __m256i* const xsecret = (const __m256i *) secret;
|
|
const __m256i prime32 = _mm256_set1_epi32((int)PRIME32_1);
|
|
|
|
size_t i;
|
|
for (i=0; i < STRIPE_LEN/sizeof(__m256i); i++) {
|
|
/* xacc[i] ^= (xacc[i] >> 47) */
|
|
__m256i const acc_vec = xacc[i];
|
|
__m256i const shifted = _mm256_srli_epi64 (acc_vec, 47);
|
|
__m256i const data_vec = _mm256_xor_si256 (acc_vec, shifted);
|
|
/* xacc[i] ^= xsecret; */
|
|
__m256i const key_vec = _mm256_loadu_si256 (xsecret+i);
|
|
__m256i const data_key = _mm256_xor_si256 (data_vec, key_vec);
|
|
|
|
/* xacc[i] *= PRIME32_1; */
|
|
__m256i const data_key_hi = _mm256_shuffle_epi32 (data_key, _MM_SHUFFLE(0, 3, 0, 1));
|
|
__m256i const prod_lo = _mm256_mul_epu32 (data_key, prime32);
|
|
__m256i const prod_hi = _mm256_mul_epu32 (data_key_hi, prime32);
|
|
xacc[i] = _mm256_add_epi64(prod_lo, _mm256_slli_epi64(prod_hi, 32));
|
|
}
|
|
}
|
|
|
|
#elif (XXH_VECTOR == XXH_SSE2)
|
|
|
|
XXH_ASSERT((((size_t)acc) & 15) == 0);
|
|
{ XXH_ALIGN(16) __m128i* const xacc = (__m128i*) acc;
|
|
/* Unaligned. This is mainly for pointer arithmetic, and because
|
|
* _mm_loadu_si128 requires a const __m128i * pointer for some reason. */
|
|
const __m128i* const xsecret = (const __m128i *) secret;
|
|
const __m128i prime32 = _mm_set1_epi32((int)PRIME32_1);
|
|
|
|
size_t i;
|
|
for (i=0; i < STRIPE_LEN/sizeof(__m128i); i++) {
|
|
/* xacc[i] ^= (xacc[i] >> 47) */
|
|
__m128i const acc_vec = xacc[i];
|
|
__m128i const shifted = _mm_srli_epi64 (acc_vec, 47);
|
|
__m128i const data_vec = _mm_xor_si128 (acc_vec, shifted);
|
|
/* xacc[i] ^= xsecret[i]; */
|
|
__m128i const key_vec = _mm_loadu_si128 (xsecret+i);
|
|
__m128i const data_key = _mm_xor_si128 (data_vec, key_vec);
|
|
|
|
/* xacc[i] *= PRIME32_1; */
|
|
__m128i const data_key_hi = _mm_shuffle_epi32 (data_key, _MM_SHUFFLE(0, 3, 0, 1));
|
|
__m128i const prod_lo = _mm_mul_epu32 (data_key, prime32);
|
|
__m128i const prod_hi = _mm_mul_epu32 (data_key_hi, prime32);
|
|
xacc[i] = _mm_add_epi64(prod_lo, _mm_slli_epi64(prod_hi, 32));
|
|
}
|
|
}
|
|
|
|
#elif (XXH_VECTOR == XXH_NEON)
|
|
|
|
XXH_ASSERT((((size_t)acc) & 15) == 0);
|
|
|
|
{ uint64x2_t* xacc = (uint64x2_t*) acc;
|
|
uint8_t const* xsecret = (uint8_t const*) secret;
|
|
uint32x2_t prime = vdup_n_u32 (PRIME32_1);
|
|
|
|
size_t i;
|
|
for (i=0; i < STRIPE_LEN/sizeof(uint64x2_t); i++) {
|
|
/* xacc[i] ^= (xacc[i] >> 47); */
|
|
uint64x2_t acc_vec = xacc[i];
|
|
uint64x2_t shifted = vshrq_n_u64 (acc_vec, 47);
|
|
uint64x2_t data_vec = veorq_u64 (acc_vec, shifted);
|
|
|
|
/* xacc[i] ^= xsecret[i]; */
|
|
uint8x16_t key_vec = vld1q_u8(xsecret + (i * 16));
|
|
uint64x2_t data_key = veorq_u64(data_vec, vreinterpretq_u64_u8(key_vec));
|
|
|
|
/* xacc[i] *= PRIME32_1 */
|
|
uint32x2_t data_key_lo, data_key_hi;
|
|
/* data_key_lo = (uint32x2_t) (xacc[i] & 0xFFFFFFFF);
|
|
* data_key_hi = (uint32x2_t) (xacc[i] >> 32);
|
|
* xacc[i] = UNDEFINED; */
|
|
XXH_SPLIT_IN_PLACE(data_key, data_key_lo, data_key_hi);
|
|
{ /*
|
|
* prod_hi = (data_key >> 32) * PRIME32_1;
|
|
*
|
|
* Avoid vmul_u32 + vshll_n_u32 since Clang 6 and 7 will
|
|
* incorrectly "optimize" this:
|
|
* tmp = vmul_u32(vmovn_u64(a), vmovn_u64(b));
|
|
* shifted = vshll_n_u32(tmp, 32);
|
|
* to this:
|
|
* tmp = "vmulq_u64"(a, b); // no such thing!
|
|
* shifted = vshlq_n_u64(tmp, 32);
|
|
*
|
|
* However, unlike SSE, Clang lacks a 64-bit multiply routine
|
|
* for NEON, and it scalarizes two 64-bit multiplies instead.
|
|
*
|
|
* vmull_u32 has the same timing as vmul_u32, and it avoids
|
|
* this bug completely.
|
|
* See https://bugs.llvm.org/show_bug.cgi?id=39967
|
|
*/
|
|
uint64x2_t prod_hi = vmull_u32 (data_key_hi, prime);
|
|
/* xacc[i] = prod_hi << 32; */
|
|
xacc[i] = vshlq_n_u64(prod_hi, 32);
|
|
/* xacc[i] += (prod_hi & 0xFFFFFFFF) * PRIME32_1; */
|
|
xacc[i] = vmlal_u32(xacc[i], data_key_lo, prime);
|
|
}
|
|
} }
|
|
|
|
#elif (XXH_VECTOR == XXH_VSX)
|
|
|
|
XXH_ASSERT((((size_t)acc) & 15) == 0);
|
|
|
|
{ xxh_u64x2* const xacc = (xxh_u64x2*) acc;
|
|
const xxh_u64x2* const xsecret = (const xxh_u64x2*) secret;
|
|
/* constants */
|
|
xxh_u64x2 const v32 = { 32, 32 };
|
|
xxh_u64x2 const v47 = { 47, 47 };
|
|
xxh_u32x4 const prime = { PRIME32_1, PRIME32_1, PRIME32_1, PRIME32_1 };
|
|
size_t i;
|
|
for (i = 0; i < STRIPE_LEN / sizeof(xxh_u64x2); i++) {
|
|
/* xacc[i] ^= (xacc[i] >> 47); */
|
|
xxh_u64x2 const acc_vec = xacc[i];
|
|
xxh_u64x2 const data_vec = acc_vec ^ (acc_vec >> v47);
|
|
|
|
/* xacc[i] ^= xsecret[i]; */
|
|
xxh_u64x2 const key_vec = XXH_vec_loadu(xsecret + i);
|
|
xxh_u64x2 const data_key = data_vec ^ key_vec;
|
|
|
|
/* xacc[i] *= PRIME32_1 */
|
|
/* prod_lo = ((xxh_u64x2)data_key & 0xFFFFFFFF) * ((xxh_u64x2)prime & 0xFFFFFFFF); */
|
|
xxh_u64x2 const prod_even = XXH_vec_mule((xxh_u32x4)data_key, prime);
|
|
/* prod_hi = ((xxh_u64x2)data_key >> 32) * ((xxh_u64x2)prime >> 32); */
|
|
xxh_u64x2 const prod_odd = XXH_vec_mulo((xxh_u32x4)data_key, prime);
|
|
xacc[i] = prod_odd + (prod_even << v32);
|
|
} }
|
|
|
|
#else /* scalar variant of Scrambler - universal */
|
|
|
|
XXH_ALIGN(XXH_ACC_ALIGN) xxh_u64* const xacc = (xxh_u64*) acc; /* presumed aligned */
|
|
const xxh_u8* const xsecret = (const xxh_u8*) secret; /* no alignment restriction */
|
|
size_t i;
|
|
XXH_ASSERT((((size_t)acc) & (XXH_ACC_ALIGN-1)) == 0);
|
|
for (i=0; i < ACC_NB; i++) {
|
|
xxh_u64 const key64 = XXH_readLE64(xsecret + 8*i);
|
|
xxh_u64 acc64 = xacc[i];
|
|
acc64 = XXH_xorshift64(acc64, 47);
|
|
acc64 ^= key64;
|
|
acc64 *= PRIME32_1;
|
|
xacc[i] = acc64;
|
|
}
|
|
|
|
#endif
|
|
}
|
|
|
|
#define XXH_PREFETCH_DIST 384
|
|
|
|
/*
|
|
* XXH3_accumulate()
|
|
* Loops over XXH3_accumulate_512().
|
|
* Assumption: nbStripes will not overflow the secret size
|
|
*/
|
|
XXH_FORCE_INLINE void
|
|
XXH3_accumulate( xxh_u64* XXH_RESTRICT acc,
|
|
const xxh_u8* XXH_RESTRICT input,
|
|
const xxh_u8* XXH_RESTRICT secret,
|
|
size_t nbStripes,
|
|
XXH3_accWidth_e accWidth)
|
|
{
|
|
size_t n;
|
|
for (n = 0; n < nbStripes; n++ ) {
|
|
const xxh_u8* const in = input + n*STRIPE_LEN;
|
|
XXH_PREFETCH(in + XXH_PREFETCH_DIST);
|
|
XXH3_accumulate_512(acc,
|
|
in,
|
|
secret + n*XXH_SECRET_CONSUME_RATE,
|
|
accWidth);
|
|
}
|
|
}
|
|
|
|
XXH_FORCE_INLINE void
|
|
XXH3_hashLong_internal_loop( xxh_u64* XXH_RESTRICT acc,
|
|
const xxh_u8* XXH_RESTRICT input, size_t len,
|
|
const xxh_u8* XXH_RESTRICT secret, size_t secretSize,
|
|
XXH3_accWidth_e accWidth)
|
|
{
|
|
size_t const nb_rounds = (secretSize - STRIPE_LEN) / XXH_SECRET_CONSUME_RATE;
|
|
size_t const block_len = STRIPE_LEN * nb_rounds;
|
|
size_t const nb_blocks = len / block_len;
|
|
|
|
size_t n;
|
|
|
|
XXH_ASSERT(secretSize >= XXH3_SECRET_SIZE_MIN);
|
|
|
|
for (n = 0; n < nb_blocks; n++) {
|
|
XXH3_accumulate(acc, input + n*block_len, secret, nb_rounds, accWidth);
|
|
XXH3_scrambleAcc(acc, secret + secretSize - STRIPE_LEN);
|
|
}
|
|
|
|
/* last partial block */
|
|
XXH_ASSERT(len > STRIPE_LEN);
|
|
{ size_t const nbStripes = (len - (block_len * nb_blocks)) / STRIPE_LEN;
|
|
XXH_ASSERT(nbStripes <= (secretSize / XXH_SECRET_CONSUME_RATE));
|
|
XXH3_accumulate(acc, input + nb_blocks*block_len, secret, nbStripes, accWidth);
|
|
|
|
/* last stripe */
|
|
if (len & (STRIPE_LEN - 1)) {
|
|
const xxh_u8* const p = input + len - STRIPE_LEN;
|
|
/* Do not align on 8, so that the secret is different from the scrambler */
|
|
#define XXH_SECRET_LASTACC_START 7
|
|
XXH3_accumulate_512(acc, p, secret + secretSize - STRIPE_LEN - XXH_SECRET_LASTACC_START, accWidth);
|
|
} }
|
|
}
|
|
|
|
XXH_FORCE_INLINE xxh_u64
|
|
XXH3_mix2Accs(const xxh_u64* XXH_RESTRICT acc, const xxh_u8* XXH_RESTRICT secret)
|
|
{
|
|
return XXH3_mul128_fold64(
|
|
acc[0] ^ XXH_readLE64(secret),
|
|
acc[1] ^ XXH_readLE64(secret+8) );
|
|
}
|
|
|
|
static XXH64_hash_t
|
|
XXH3_mergeAccs(const xxh_u64* XXH_RESTRICT acc, const xxh_u8* XXH_RESTRICT secret, xxh_u64 start)
|
|
{
|
|
xxh_u64 result64 = start;
|
|
|
|
result64 += XXH3_mix2Accs(acc+0, secret + 0);
|
|
result64 += XXH3_mix2Accs(acc+2, secret + 16);
|
|
result64 += XXH3_mix2Accs(acc+4, secret + 32);
|
|
result64 += XXH3_mix2Accs(acc+6, secret + 48);
|
|
|
|
return XXH3_avalanche(result64);
|
|
}
|
|
|
|
#define XXH3_INIT_ACC { PRIME32_3, PRIME64_1, PRIME64_2, PRIME64_3, \
|
|
PRIME64_4, PRIME32_2, PRIME64_5, PRIME32_1 }
|
|
|
|
XXH_FORCE_INLINE XXH64_hash_t
|
|
XXH3_hashLong_64b_internal(const xxh_u8* XXH_RESTRICT input, size_t len,
|
|
const xxh_u8* XXH_RESTRICT secret, size_t secretSize)
|
|
{
|
|
XXH_ALIGN(XXH_ACC_ALIGN) xxh_u64 acc[ACC_NB] = XXH3_INIT_ACC;
|
|
|
|
XXH3_hashLong_internal_loop(acc, input, len, secret, secretSize, XXH3_acc_64bits);
|
|
|
|
/* converge into final hash */
|
|
XXH_STATIC_ASSERT(sizeof(acc) == 64);
|
|
/* do not align on 8, so that the secret is different from the accumulator */
|
|
#define XXH_SECRET_MERGEACCS_START 11
|
|
XXH_ASSERT(secretSize >= sizeof(acc) + XXH_SECRET_MERGEACCS_START);
|
|
return XXH3_mergeAccs(acc, secret + XXH_SECRET_MERGEACCS_START, (xxh_u64)len * PRIME64_1);
|
|
}
|
|
|
|
XXH_FORCE_INLINE void XXH_writeLE64(void* dst, xxh_u64 v64)
|
|
{
|
|
if (!XXH_CPU_LITTLE_ENDIAN) v64 = XXH_swap64(v64);
|
|
memcpy(dst, &v64, sizeof(v64));
|
|
}
|
|
|
|
/* XXH3_initCustomSecret() :
|
|
* destination `customSecret` is presumed allocated and same size as `kSecret`.
|
|
*/
|
|
XXH_FORCE_INLINE void XXH3_initCustomSecret(xxh_u8* customSecret, xxh_u64 seed64)
|
|
{
|
|
int const nbRounds = XXH_SECRET_DEFAULT_SIZE / 16;
|
|
int i;
|
|
|
|
XXH_STATIC_ASSERT((XXH_SECRET_DEFAULT_SIZE & 15) == 0);
|
|
|
|
for (i=0; i < nbRounds; i++) {
|
|
XXH_writeLE64(customSecret + 16*i, XXH_readLE64(kSecret + 16*i) + seed64);
|
|
XXH_writeLE64(customSecret + 16*i + 8, XXH_readLE64(kSecret + 16*i + 8) - seed64);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* It's important for performance that XXH3_hashLong is not inlined. Not sure
|
|
* why (uop cache maybe?), but the difference is large and easily measurable.
|
|
*/
|
|
XXH_NO_INLINE XXH64_hash_t
|
|
XXH3_hashLong_64b_defaultSecret(const xxh_u8* XXH_RESTRICT input, size_t len)
|
|
{
|
|
return XXH3_hashLong_64b_internal(input, len, kSecret, sizeof(kSecret));
|
|
}
|
|
|
|
/*
|
|
* It's important for performance that XXH3_hashLong is not inlined. Not sure
|
|
* why (uop cache maybe?), but the difference is large and easily measurable.
|
|
*/
|
|
XXH_NO_INLINE XXH64_hash_t
|
|
XXH3_hashLong_64b_withSecret(const xxh_u8* XXH_RESTRICT input, size_t len,
|
|
const xxh_u8* XXH_RESTRICT secret, size_t secretSize)
|
|
{
|
|
return XXH3_hashLong_64b_internal(input, len, secret, secretSize);
|
|
}
|
|
|
|
/*
|
|
* XXH3_hashLong_64b_withSeed():
|
|
* Generate a custom key based on alteration of default kSecret with the seed,
|
|
* and then use this key for long mode hashing.
|
|
*
|
|
* This operation is decently fast but nonetheless costs a little bit of time.
|
|
* Try to avoid it whenever possible (typically when seed==0).
|
|
*
|
|
* It's important for performance that XXH3_hashLong is not inlined. Not sure
|
|
* why (uop cache maybe?), but the difference is large and easily measurable.
|
|
*/
|
|
XXH_NO_INLINE XXH64_hash_t
|
|
XXH3_hashLong_64b_withSeed(const xxh_u8* input, size_t len, XXH64_hash_t seed)
|
|
{
|
|
XXH_ALIGN(8) xxh_u8 secret[XXH_SECRET_DEFAULT_SIZE];
|
|
if (seed==0) return XXH3_hashLong_64b_defaultSecret(input, len);
|
|
XXH3_initCustomSecret(secret, seed);
|
|
return XXH3_hashLong_64b_internal(input, len, secret, sizeof(secret));
|
|
}
|
|
|
|
/* === Public entry point === */
|
|
|
|
XXH_PUBLIC_API XXH64_hash_t XXH3_64bits(const void* input, size_t len)
|
|
{
|
|
if (len <= 16)
|
|
return XXH3_len_0to16_64b((const xxh_u8*)input, len, kSecret, 0);
|
|
if (len <= 128)
|
|
return XXH3_len_17to128_64b((const xxh_u8*)input, len, kSecret, sizeof(kSecret), 0);
|
|
if (len <= XXH3_MIDSIZE_MAX)
|
|
return XXH3_len_129to240_64b((const xxh_u8*)input, len, kSecret, sizeof(kSecret), 0);
|
|
return XXH3_hashLong_64b_defaultSecret((const xxh_u8*)input, len);
|
|
}
|
|
|
|
XXH_PUBLIC_API XXH64_hash_t
|
|
XXH3_64bits_withSecret(const void* input, size_t len, const void* secret, size_t secretSize)
|
|
{
|
|
XXH_ASSERT(secretSize >= XXH3_SECRET_SIZE_MIN);
|
|
/*
|
|
* 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_64b((const xxh_u8*)input, len, (const xxh_u8*)secret, 0);
|
|
if (len <= 128)
|
|
return XXH3_len_17to128_64b((const xxh_u8*)input, len, (const xxh_u8*)secret, secretSize, 0);
|
|
if (len <= XXH3_MIDSIZE_MAX)
|
|
return XXH3_len_129to240_64b((const xxh_u8*)input, len, (const xxh_u8*)secret, secretSize, 0);
|
|
return XXH3_hashLong_64b_withSecret((const xxh_u8*)input, len, (const xxh_u8*)secret, secretSize);
|
|
}
|
|
|
|
XXH_PUBLIC_API XXH64_hash_t
|
|
XXH3_64bits_withSeed(const void* input, size_t len, XXH64_hash_t seed)
|
|
{
|
|
if (len <= 16)
|
|
return XXH3_len_0to16_64b((const xxh_u8*)input, len, kSecret, seed);
|
|
if (len <= 128)
|
|
return XXH3_len_17to128_64b((const xxh_u8*)input, len, kSecret, sizeof(kSecret), seed);
|
|
if (len <= XXH3_MIDSIZE_MAX)
|
|
return XXH3_len_129to240_64b((const xxh_u8*)input, len, kSecret, sizeof(kSecret), seed);
|
|
return XXH3_hashLong_64b_withSeed((const xxh_u8*)input, len, seed);
|
|
}
|
|
|
|
/* === XXH3 streaming === */
|
|
|
|
|
|
/*
|
|
* Malloc's a pointer that is always aligned to align.
|
|
*
|
|
* This must be freed with `XXH_alignedFree()`.
|
|
*
|
|
* malloc typically guarantees 16 byte alignment on 64-bit systems and 8 byte
|
|
* alignment on 32-bit. This isn't enough for the 32 byte aligned loads in AVX2
|
|
* or on 32-bit, the 16 byte aligned loads in SSE2 and NEON.
|
|
*
|
|
* This underalignment previously caused a rather obvious crash which went
|
|
* completely unnoticed due to XXH3_createState() not actually being tested.
|
|
* Credit to RedSpah for noticing this bug.
|
|
*
|
|
* The alignment is done manually: Functions like posix_memalign or _mm_malloc
|
|
* are avoided: To maintain portability, we would have to write a fallback
|
|
* like this anyways, and besides, testing for the existence of library
|
|
* functions without relying on external build tools is impossible.
|
|
*
|
|
* The method is simple: Overallocate, manually align, and store the offset
|
|
* to the original behind the returned pointer.
|
|
*
|
|
* Align must be a power of 2 and 8 <= align <= 128.
|
|
*/
|
|
static void* XXH_alignedMalloc(size_t s, size_t align)
|
|
{
|
|
XXH_ASSERT(align <= 128 && align >= 8); /* range check */
|
|
XXH_ASSERT((align & (align-1)) == 0); /* power of 2 */
|
|
XXH_ASSERT(s != 0 && s < (s + align)); /* empty/overflow */
|
|
{ /* Overallocate to make room for manual realignment and an offset byte */
|
|
xxh_u8* base = (xxh_u8*)XXH_malloc(s + align);
|
|
if (base != NULL) {
|
|
/*
|
|
* Get the offset needed to align this pointer.
|
|
*
|
|
* Even if the returned pointer is aligned, there will always be
|
|
* at least one byte to store the offset to the original pointer.
|
|
*/
|
|
size_t offset = align - ((size_t)base & (align - 1)); /* base % align */
|
|
/* Add the offset for the now-aligned pointer */
|
|
xxh_u8* ptr = base + offset;
|
|
|
|
XXH_ASSERT((size_t)ptr % align == 0);
|
|
|
|
/* Store the offset immediately before the returned pointer. */
|
|
ptr[-1] = (xxh_u8)offset;
|
|
return ptr;
|
|
}
|
|
return NULL;
|
|
}
|
|
}
|
|
/*
|
|
* Frees an aligned pointer allocated by XXH_alignedMalloc(). Don't pass
|
|
* normal malloc'd pointers, XXH_alignedMalloc has a specific data layout.
|
|
*/
|
|
static void XXH_alignedFree(void* p)
|
|
{
|
|
if (p != NULL) {
|
|
xxh_u8* ptr = (xxh_u8*)p;
|
|
/* Get the offset byte we added in XXH_malloc. */
|
|
xxh_u8 offset = ptr[-1];
|
|
/* Free the original malloc'd pointer */
|
|
xxh_u8* base = ptr - offset;
|
|
XXH_free(base);
|
|
}
|
|
}
|
|
XXH_PUBLIC_API XXH3_state_t* XXH3_createState(void)
|
|
{
|
|
return (XXH3_state_t*)XXH_alignedMalloc(sizeof(XXH3_state_t), 64);
|
|
}
|
|
|
|
XXH_PUBLIC_API XXH_errorcode XXH3_freeState(XXH3_state_t* statePtr)
|
|
{
|
|
XXH_alignedFree(statePtr);
|
|
return XXH_OK;
|
|
}
|
|
|
|
XXH_PUBLIC_API void
|
|
XXH3_copyState(XXH3_state_t* dst_state, const XXH3_state_t* src_state)
|
|
{
|
|
memcpy(dst_state, src_state, sizeof(*dst_state));
|
|
}
|
|
|
|
static void
|
|
XXH3_64bits_reset_internal(XXH3_state_t* statePtr,
|
|
XXH64_hash_t seed,
|
|
const xxh_u8* secret, size_t secretSize)
|
|
{
|
|
XXH_ASSERT(statePtr != NULL);
|
|
memset(statePtr, 0, sizeof(*statePtr));
|
|
statePtr->acc[0] = PRIME32_3;
|
|
statePtr->acc[1] = PRIME64_1;
|
|
statePtr->acc[2] = PRIME64_2;
|
|
statePtr->acc[3] = PRIME64_3;
|
|
statePtr->acc[4] = PRIME64_4;
|
|
statePtr->acc[5] = PRIME32_2;
|
|
statePtr->acc[6] = PRIME64_5;
|
|
statePtr->acc[7] = PRIME32_1;
|
|
statePtr->seed = seed;
|
|
XXH_ASSERT(secret != NULL);
|
|
statePtr->secret = secret;
|
|
XXH_ASSERT(secretSize >= XXH3_SECRET_SIZE_MIN);
|
|
statePtr->secretLimit = (XXH32_hash_t)(secretSize - STRIPE_LEN);
|
|
statePtr->nbStripesPerBlock = statePtr->secretLimit / XXH_SECRET_CONSUME_RATE;
|
|
}
|
|
|
|
XXH_PUBLIC_API XXH_errorcode
|
|
XXH3_64bits_reset(XXH3_state_t* statePtr)
|
|
{
|
|
if (statePtr == NULL) return XXH_ERROR;
|
|
XXH3_64bits_reset_internal(statePtr, 0, kSecret, XXH_SECRET_DEFAULT_SIZE);
|
|
return XXH_OK;
|
|
}
|
|
|
|
XXH_PUBLIC_API XXH_errorcode
|
|
XXH3_64bits_reset_withSecret(XXH3_state_t* statePtr, const void* secret, size_t secretSize)
|
|
{
|
|
if (statePtr == NULL) return XXH_ERROR;
|
|
XXH3_64bits_reset_internal(statePtr, 0, (const xxh_u8*)secret, secretSize);
|
|
if (secret == NULL) return XXH_ERROR;
|
|
if (secretSize < XXH3_SECRET_SIZE_MIN) return XXH_ERROR;
|
|
return XXH_OK;
|
|
}
|
|
|
|
XXH_PUBLIC_API XXH_errorcode
|
|
XXH3_64bits_reset_withSeed(XXH3_state_t* statePtr, XXH64_hash_t seed)
|
|
{
|
|
if (statePtr == NULL) return XXH_ERROR;
|
|
XXH3_64bits_reset_internal(statePtr, seed, kSecret, XXH_SECRET_DEFAULT_SIZE);
|
|
XXH3_initCustomSecret(statePtr->customSecret, seed);
|
|
statePtr->secret = statePtr->customSecret;
|
|
return XXH_OK;
|
|
}
|
|
|
|
XXH_FORCE_INLINE void
|
|
XXH3_consumeStripes( xxh_u64* acc,
|
|
XXH32_hash_t* nbStripesSoFarPtr, XXH32_hash_t nbStripesPerBlock,
|
|
const xxh_u8* input, size_t totalStripes,
|
|
const xxh_u8* secret, size_t secretLimit,
|
|
XXH3_accWidth_e accWidth)
|
|
{
|
|
XXH_ASSERT(*nbStripesSoFarPtr < nbStripesPerBlock);
|
|
if (nbStripesPerBlock - *nbStripesSoFarPtr <= totalStripes) {
|
|
/* need a scrambling operation */
|
|
size_t const nbStripes = nbStripesPerBlock - *nbStripesSoFarPtr;
|
|
XXH3_accumulate(acc, input, secret + nbStripesSoFarPtr[0] * XXH_SECRET_CONSUME_RATE, nbStripes, accWidth);
|
|
XXH3_scrambleAcc(acc, secret + secretLimit);
|
|
XXH3_accumulate(acc, input + nbStripes * STRIPE_LEN, secret, totalStripes - nbStripes, accWidth);
|
|
*nbStripesSoFarPtr = (XXH32_hash_t)(totalStripes - nbStripes);
|
|
} else {
|
|
XXH3_accumulate(acc, input, secret + nbStripesSoFarPtr[0] * XXH_SECRET_CONSUME_RATE, totalStripes, accWidth);
|
|
*nbStripesSoFarPtr += (XXH32_hash_t)totalStripes;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Both XXH3_64bits_update and XXH3_128bits_update use this routine.
|
|
*/
|
|
XXH_FORCE_INLINE XXH_errorcode
|
|
XXH3_update(XXH3_state_t* state, const xxh_u8* input, size_t len, XXH3_accWidth_e accWidth)
|
|
{
|
|
if (input==NULL)
|
|
#if defined(XXH_ACCEPT_NULL_INPUT_POINTER) && (XXH_ACCEPT_NULL_INPUT_POINTER>=1)
|
|
return XXH_OK;
|
|
#else
|
|
return XXH_ERROR;
|
|
#endif
|
|
|
|
{ const xxh_u8* const bEnd = input + len;
|
|
|
|
state->totalLen += len;
|
|
|
|
if (state->bufferedSize + len <= XXH3_INTERNALBUFFER_SIZE) { /* fill in tmp buffer */
|
|
XXH_memcpy(state->buffer + state->bufferedSize, input, len);
|
|
state->bufferedSize += (XXH32_hash_t)len;
|
|
return XXH_OK;
|
|
}
|
|
/* input is now > XXH3_INTERNALBUFFER_SIZE */
|
|
|
|
#define XXH3_INTERNALBUFFER_STRIPES (XXH3_INTERNALBUFFER_SIZE / STRIPE_LEN)
|
|
XXH_STATIC_ASSERT(XXH3_INTERNALBUFFER_SIZE % STRIPE_LEN == 0); /* clean multiple */
|
|
|
|
/*
|
|
* There is some input left inside the internal buffer.
|
|
* Fill it, then consume it.
|
|
*/
|
|
if (state->bufferedSize) {
|
|
size_t const loadSize = XXH3_INTERNALBUFFER_SIZE - state->bufferedSize;
|
|
XXH_memcpy(state->buffer + state->bufferedSize, input, loadSize);
|
|
input += loadSize;
|
|
XXH3_consumeStripes(state->acc,
|
|
&state->nbStripesSoFar, state->nbStripesPerBlock,
|
|
state->buffer, XXH3_INTERNALBUFFER_STRIPES,
|
|
state->secret, state->secretLimit,
|
|
accWidth);
|
|
state->bufferedSize = 0;
|
|
}
|
|
|
|
/* Consume input by full buffer quantities */
|
|
if (input+XXH3_INTERNALBUFFER_SIZE <= bEnd) {
|
|
const xxh_u8* const limit = bEnd - XXH3_INTERNALBUFFER_SIZE;
|
|
do {
|
|
XXH3_consumeStripes(state->acc,
|
|
&state->nbStripesSoFar, state->nbStripesPerBlock,
|
|
input, XXH3_INTERNALBUFFER_STRIPES,
|
|
state->secret, state->secretLimit,
|
|
accWidth);
|
|
input += XXH3_INTERNALBUFFER_SIZE;
|
|
} while (input<=limit);
|
|
}
|
|
|
|
if (input < bEnd) { /* Some remaining input: buffer it */
|
|
XXH_memcpy(state->buffer, input, (size_t)(bEnd-input));
|
|
state->bufferedSize = (XXH32_hash_t)(bEnd-input);
|
|
}
|
|
}
|
|
|
|
return XXH_OK;
|
|
}
|
|
|
|
XXH_PUBLIC_API XXH_errorcode
|
|
XXH3_64bits_update(XXH3_state_t* state, const void* input, size_t len)
|
|
{
|
|
return XXH3_update(state, (const xxh_u8*)input, len, XXH3_acc_64bits);
|
|
}
|
|
|
|
|
|
XXH_FORCE_INLINE void
|
|
XXH3_digest_long (XXH64_hash_t* acc, const XXH3_state_t* state, XXH3_accWidth_e accWidth)
|
|
{
|
|
/*
|
|
* Digest on a local copy. This way, the state remains unaltered, and it can
|
|
* continue ingesting more input afterwards.
|
|
*/
|
|
memcpy(acc, state->acc, sizeof(state->acc));
|
|
if (state->bufferedSize >= STRIPE_LEN) {
|
|
size_t const totalNbStripes = state->bufferedSize / STRIPE_LEN;
|
|
XXH32_hash_t nbStripesSoFar = state->nbStripesSoFar;
|
|
XXH3_consumeStripes(acc,
|
|
&nbStripesSoFar, state->nbStripesPerBlock,
|
|
state->buffer, totalNbStripes,
|
|
state->secret, state->secretLimit,
|
|
accWidth);
|
|
if (state->bufferedSize % STRIPE_LEN) { /* one last partial stripe */
|
|
XXH3_accumulate_512(acc,
|
|
state->buffer + state->bufferedSize - STRIPE_LEN,
|
|
state->secret + state->secretLimit - XXH_SECRET_LASTACC_START,
|
|
accWidth);
|
|
}
|
|
} else { /* bufferedSize < STRIPE_LEN */
|
|
if (state->bufferedSize) { /* one last stripe */
|
|
xxh_u8 lastStripe[STRIPE_LEN];
|
|
size_t const catchupSize = STRIPE_LEN - state->bufferedSize;
|
|
memcpy(lastStripe, state->buffer + sizeof(state->buffer) - catchupSize, catchupSize);
|
|
memcpy(lastStripe + catchupSize, state->buffer, state->bufferedSize);
|
|
XXH3_accumulate_512(acc,
|
|
lastStripe,
|
|
state->secret + state->secretLimit - XXH_SECRET_LASTACC_START,
|
|
accWidth);
|
|
} }
|
|
}
|
|
|
|
XXH_PUBLIC_API XXH64_hash_t XXH3_64bits_digest (const XXH3_state_t* state)
|
|
{
|
|
if (state->totalLen > XXH3_MIDSIZE_MAX) {
|
|
XXH_ALIGN(XXH_ACC_ALIGN) XXH64_hash_t acc[ACC_NB];
|
|
XXH3_digest_long(acc, state, XXH3_acc_64bits);
|
|
return XXH3_mergeAccs(acc,
|
|
state->secret + XXH_SECRET_MERGEACCS_START,
|
|
(xxh_u64)state->totalLen * PRIME64_1);
|
|
}
|
|
/* len <= XXH3_MIDSIZE_MAX: short code */
|
|
if (state->seed)
|
|
return XXH3_64bits_withSeed(state->buffer, (size_t)state->totalLen, state->seed);
|
|
return XXH3_64bits_withSecret(state->buffer, (size_t)(state->totalLen),
|
|
state->secret, state->secretLimit + STRIPE_LEN);
|
|
}
|
|
|
|
/* ==========================================
|
|
* 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).
|
|
*/
|
|
|
|
XXH_FORCE_INLINE XXH128_hash_t
|
|
XXH3_len_1to3_128b(const xxh_u8* input, size_t len, const xxh_u8* secret, XXH64_hash_t seed)
|
|
{
|
|
/* A doubled version of 1to3_64b with different constants. */
|
|
XXH_ASSERT(input != NULL);
|
|
XXH_ASSERT(1 <= len && len <= 3);
|
|
XXH_ASSERT(secret != NULL);
|
|
/*
|
|
* 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] }
|
|
*/
|
|
{ xxh_u8 const c1 = input[0];
|
|
xxh_u8 const c2 = input[len >> 1];
|
|
xxh_u8 const c3 = input[len - 1];
|
|
xxh_u32 const combinedl = ((xxh_u32)c1 <<16) | ((xxh_u32)c2 << 24)
|
|
| ((xxh_u32)c3 << 0) | ((xxh_u32)len << 8);
|
|
xxh_u32 const combinedh = XXH_rotl32(XXH_swap32(combinedl), 13);
|
|
xxh_u64 const bitflipl = (XXH_readLE32(secret) ^ XXH_readLE32(secret+4)) + seed;
|
|
xxh_u64 const bitfliph = (XXH_readLE32(secret+8) ^ XXH_readLE32(secret+12)) - seed;
|
|
xxh_u64 const keyed_lo = (xxh_u64)combinedl ^ bitflipl;
|
|
xxh_u64 const keyed_hi = (xxh_u64)combinedh ^ bitfliph;
|
|
xxh_u64 const mixedl = keyed_lo * PRIME64_1;
|
|
xxh_u64 const mixedh = keyed_hi * PRIME64_5;
|
|
XXH128_hash_t h128;
|
|
h128.low64 = XXH3_avalanche(mixedl);
|
|
h128.high64 = XXH3_avalanche(mixedh);
|
|
return h128;
|
|
}
|
|
}
|
|
|
|
XXH_FORCE_INLINE XXH128_hash_t
|
|
XXH3_len_4to8_128b(const xxh_u8* input, size_t len, const xxh_u8* secret, XXH64_hash_t seed)
|
|
{
|
|
XXH_ASSERT(input != NULL);
|
|
XXH_ASSERT(secret != NULL);
|
|
XXH_ASSERT(4 <= len && len <= 8);
|
|
seed ^= (xxh_u64)XXH_swap32((xxh_u32)seed) << 32;
|
|
{ xxh_u32 const input_lo = XXH_readLE32(input);
|
|
xxh_u32 const input_hi = XXH_readLE32(input + len - 4);
|
|
xxh_u64 const input_64 = input_lo + ((xxh_u64)input_hi << 32);
|
|
xxh_u64 const bitflip = (XXH_readLE64(secret+16) ^ XXH_readLE64(secret+24)) + seed;
|
|
xxh_u64 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 *= 0x9FB21C651E98DF25ULL;
|
|
m128.low64 = XXH_xorshift64(m128.low64, 28);
|
|
m128.high64 = XXH3_avalanche(m128.high64);
|
|
return m128;
|
|
}
|
|
}
|
|
|
|
XXH_FORCE_INLINE XXH128_hash_t
|
|
XXH3_len_9to16_128b(const xxh_u8* input, size_t len, const xxh_u8* secret, XXH64_hash_t seed)
|
|
{
|
|
XXH_ASSERT(input != NULL);
|
|
XXH_ASSERT(secret != NULL);
|
|
XXH_ASSERT(9 <= len && len <= 16);
|
|
{ xxh_u64 const bitflipl = (XXH_readLE64(secret+32) ^ XXH_readLE64(secret+40)) - seed;
|
|
xxh_u64 const bitfliph = (XXH_readLE64(secret+48) ^ XXH_readLE64(secret+56)) + seed;
|
|
xxh_u64 const input_lo = XXH_readLE64(input);
|
|
xxh_u64 input_hi = XXH_readLE64(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 += (xxh_u64)(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(xxh_u64)) { /* 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 & 0xFFFFFFFF00000000) + XXH_mult32to64((xxh_u32)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 + ((xxh_u64)input_hi.lo * (PRIME32_2 - 1))
|
|
*
|
|
* Since input_hi.hi + input_hi.lo == input_hi, we get this:
|
|
* input_hi + ((xxh_u64)input_hi.lo * (PRIME32_2 - 1))
|
|
*/
|
|
m128.high64 += input_hi + XXH_mult32to64((xxh_u32)input_hi, PRIME32_2 - 1);
|
|
}
|
|
/* m128 ^= XXH_swap64(m128 >> 64); */
|
|
m128.low64 ^= XXH_swap64(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
|
|
*/
|
|
XXH_FORCE_INLINE XXH128_hash_t
|
|
XXH3_len_0to16_128b(const xxh_u8* input, size_t len, const xxh_u8* secret, XXH64_hash_t seed)
|
|
{
|
|
XXH_ASSERT(len <= 16);
|
|
{ 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;
|
|
xxh_u64 const bitflipl = XXH_readLE64(secret+64) ^ XXH_readLE64(secret+72);
|
|
xxh_u64 const bitfliph = XXH_readLE64(secret+80) ^ XXH_readLE64(secret+88);
|
|
h128.low64 = XXH3_avalanche((PRIME64_1 + seed) ^ bitflipl);
|
|
h128.high64 = XXH3_avalanche((PRIME64_2 - seed) ^ bitfliph);
|
|
return h128;
|
|
} }
|
|
}
|
|
|
|
/*
|
|
* A bit slower than XXH3_mix16B, but handles multiply by zero better.
|
|
*/
|
|
XXH_FORCE_INLINE XXH128_hash_t
|
|
XXH128_mix32B(XXH128_hash_t acc, const xxh_u8* input_1, const xxh_u8* input_2,
|
|
const xxh_u8* secret, XXH64_hash_t seed)
|
|
{
|
|
acc.low64 += XXH3_mix16B (input_1, secret+0, seed);
|
|
acc.low64 ^= XXH_readLE64(input_2) + XXH_readLE64(input_2 + 8);
|
|
acc.high64 += XXH3_mix16B (input_2, secret+16, seed);
|
|
acc.high64 ^= XXH_readLE64(input_1) + XXH_readLE64(input_1 + 8);
|
|
return acc;
|
|
}
|
|
|
|
|
|
XXH_FORCE_INLINE XXH128_hash_t
|
|
XXH3_len_17to128_128b(const xxh_u8* XXH_RESTRICT input, size_t len,
|
|
const xxh_u8* XXH_RESTRICT secret, size_t secretSize,
|
|
XXH64_hash_t seed)
|
|
{
|
|
XXH_ASSERT(secretSize >= XXH3_SECRET_SIZE_MIN); (void)secretSize;
|
|
XXH_ASSERT(16 < len && len <= 128);
|
|
|
|
{ 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 = (XXH64_hash_t)0 - XXH3_avalanche(h128.high64);
|
|
return h128;
|
|
}
|
|
}
|
|
}
|
|
|
|
XXH_NO_INLINE XXH128_hash_t
|
|
XXH3_len_129to240_128b(const xxh_u8* XXH_RESTRICT input, size_t len,
|
|
const xxh_u8* XXH_RESTRICT secret, size_t secretSize,
|
|
XXH64_hash_t seed)
|
|
{
|
|
XXH_ASSERT(secretSize >= XXH3_SECRET_SIZE_MIN); (void)secretSize;
|
|
XXH_ASSERT(128 < len && len <= XXH3_MIDSIZE_MAX);
|
|
|
|
{ XXH128_hash_t acc;
|
|
int const nbRounds = (int)len / 32;
|
|
int i;
|
|
acc.low64 = len * PRIME64_1;
|
|
acc.high64 = 0;
|
|
for (i=0; i<4; i++) {
|
|
acc = XXH128_mix32B(acc,
|
|
input + (32 * i),
|
|
input + (32 * i) + 16,
|
|
secret + (32 * i),
|
|
seed);
|
|
}
|
|
acc.low64 = XXH3_avalanche(acc.low64);
|
|
acc.high64 = XXH3_avalanche(acc.high64);
|
|
XXH_ASSERT(nbRounds >= 4);
|
|
for (i=4 ; i < nbRounds; i++) {
|
|
acc = XXH128_mix32B(acc,
|
|
input + (32 * i),
|
|
input + (32 * i) + 16,
|
|
secret + XXH3_MIDSIZE_STARTOFFSET + (32 * (i - 4)),
|
|
seed);
|
|
}
|
|
/* last bytes */
|
|
acc = XXH128_mix32B(acc,
|
|
input + len - 16,
|
|
input + len - 32,
|
|
secret + XXH3_SECRET_SIZE_MIN - XXH3_MIDSIZE_LASTOFFSET - 16,
|
|
0ULL - 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 = (XXH64_hash_t)0 - XXH3_avalanche(h128.high64);
|
|
return h128;
|
|
}
|
|
}
|
|
}
|
|
|
|
XXH_FORCE_INLINE XXH128_hash_t
|
|
XXH3_hashLong_128b_internal(const xxh_u8* XXH_RESTRICT input, size_t len,
|
|
const xxh_u8* XXH_RESTRICT secret, size_t secretSize)
|
|
{
|
|
XXH_ALIGN(XXH_ACC_ALIGN) xxh_u64 acc[ACC_NB] = XXH3_INIT_ACC;
|
|
|
|
XXH3_hashLong_internal_loop(acc, input, len, secret, secretSize, XXH3_acc_128bits);
|
|
|
|
/* converge into final hash */
|
|
XXH_STATIC_ASSERT(sizeof(acc) == 64);
|
|
XXH_ASSERT(secretSize >= sizeof(acc) + XXH_SECRET_MERGEACCS_START);
|
|
{ XXH128_hash_t h128;
|
|
h128.low64 = XXH3_mergeAccs(acc,
|
|
secret + XXH_SECRET_MERGEACCS_START,
|
|
(xxh_u64)len * PRIME64_1);
|
|
h128.high64 = XXH3_mergeAccs(acc,
|
|
secret + secretSize
|
|
- sizeof(acc) - XXH_SECRET_MERGEACCS_START,
|
|
~((xxh_u64)len * PRIME64_2));
|
|
return h128;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* It's important for performance that XXH3_hashLong is not inlined. Not sure
|
|
* why (uop cache maybe?), but the difference is large and easily measurable.
|
|
*/
|
|
XXH_NO_INLINE XXH128_hash_t
|
|
XXH3_hashLong_128b_defaultSecret(const xxh_u8* input, size_t len)
|
|
{
|
|
return XXH3_hashLong_128b_internal(input, len, kSecret, sizeof(kSecret));
|
|
}
|
|
|
|
/*
|
|
* It's important for performance that XXH3_hashLong is not inlined. Not sure
|
|
* why (uop cache maybe?), but the difference is large and easily measurable.
|
|
*/
|
|
XXH_NO_INLINE XXH128_hash_t
|
|
XXH3_hashLong_128b_withSecret(const xxh_u8* input, size_t len,
|
|
const xxh_u8* secret, size_t secretSize)
|
|
{
|
|
return XXH3_hashLong_128b_internal(input, len, secret, secretSize);
|
|
}
|
|
|
|
/*
|
|
* It's important for performance that XXH3_hashLong is not inlined. Not sure
|
|
* why (uop cache maybe?), but the difference is large and easily measurable.
|
|
*/
|
|
XXH_NO_INLINE XXH128_hash_t
|
|
XXH3_hashLong_128b_withSeed(const xxh_u8* input, size_t len, XXH64_hash_t seed)
|
|
{
|
|
XXH_ALIGN(8) xxh_u8 secret[XXH_SECRET_DEFAULT_SIZE];
|
|
if (seed == 0) return XXH3_hashLong_128b_defaultSecret(input, len);
|
|
XXH3_initCustomSecret(secret, seed);
|
|
return XXH3_hashLong_128b_internal(input, len, secret, sizeof(secret));
|
|
}
|
|
|
|
|
|
XXH_PUBLIC_API XXH128_hash_t XXH3_128bits(const void* input, size_t len)
|
|
{
|
|
if (len <= 16)
|
|
return XXH3_len_0to16_128b((const xxh_u8*)input, len, kSecret, 0);
|
|
if (len <= 128)
|
|
return XXH3_len_17to128_128b((const xxh_u8*)input, len, kSecret, sizeof(kSecret), 0);
|
|
if (len <= XXH3_MIDSIZE_MAX)
|
|
return XXH3_len_129to240_128b((const xxh_u8*)input, len, kSecret, sizeof(kSecret), 0);
|
|
return XXH3_hashLong_128b_defaultSecret((const xxh_u8*)input, len);
|
|
}
|
|
|
|
XXH_PUBLIC_API XXH128_hash_t
|
|
XXH3_128bits_withSecret(const void* input, size_t len, const void* secret, size_t secretSize)
|
|
{
|
|
XXH_ASSERT(secretSize >= XXH3_SECRET_SIZE_MIN);
|
|
/*
|
|
* 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((const xxh_u8*)input, len, (const xxh_u8*)secret, 0);
|
|
if (len <= 128)
|
|
return XXH3_len_17to128_128b((const xxh_u8*)input, len, (const xxh_u8*)secret, secretSize, 0);
|
|
if (len <= XXH3_MIDSIZE_MAX)
|
|
return XXH3_len_129to240_128b((const xxh_u8*)input, len, (const xxh_u8*)secret, secretSize, 0);
|
|
return XXH3_hashLong_128b_withSecret((const xxh_u8*)input, len, (const xxh_u8*)secret, secretSize);
|
|
}
|
|
|
|
XXH_PUBLIC_API XXH128_hash_t
|
|
XXH3_128bits_withSeed(const void* input, size_t len, XXH64_hash_t seed)
|
|
{
|
|
if (len <= 16)
|
|
return XXH3_len_0to16_128b((const xxh_u8*)input, len, kSecret, seed);
|
|
if (len <= 128)
|
|
return XXH3_len_17to128_128b((const xxh_u8*)input, len, kSecret, sizeof(kSecret), seed);
|
|
if (len <= XXH3_MIDSIZE_MAX)
|
|
return XXH3_len_129to240_128b((const xxh_u8*)input, len, kSecret, sizeof(kSecret), seed);
|
|
return XXH3_hashLong_128b_withSeed((const xxh_u8*)input, len, seed);
|
|
}
|
|
|
|
XXH_PUBLIC_API XXH128_hash_t
|
|
XXH128(const void* input, size_t len, XXH64_hash_t seed)
|
|
{
|
|
return XXH3_128bits_withSeed(input, len, seed);
|
|
}
|
|
|
|
|
|
/* === XXH3 128-bit streaming === */
|
|
|
|
/*
|
|
* All the functions are actually the same as for 64-bit streaming variant.
|
|
* The only difference is the finalizatiom routine.
|
|
*/
|
|
|
|
static void
|
|
XXH3_128bits_reset_internal(XXH3_state_t* statePtr,
|
|
XXH64_hash_t seed,
|
|
const xxh_u8* secret, size_t secretSize)
|
|
{
|
|
XXH3_64bits_reset_internal(statePtr, seed, secret, secretSize);
|
|
}
|
|
|
|
XXH_PUBLIC_API XXH_errorcode
|
|
XXH3_128bits_reset(XXH3_state_t* statePtr)
|
|
{
|
|
if (statePtr == NULL) return XXH_ERROR;
|
|
XXH3_128bits_reset_internal(statePtr, 0, kSecret, XXH_SECRET_DEFAULT_SIZE);
|
|
return XXH_OK;
|
|
}
|
|
|
|
XXH_PUBLIC_API XXH_errorcode
|
|
XXH3_128bits_reset_withSecret(XXH3_state_t* statePtr, const void* secret, size_t secretSize)
|
|
{
|
|
if (statePtr == NULL) return XXH_ERROR;
|
|
XXH3_128bits_reset_internal(statePtr, 0, (const xxh_u8*)secret, secretSize);
|
|
if (secret == NULL) return XXH_ERROR;
|
|
if (secretSize < XXH3_SECRET_SIZE_MIN) return XXH_ERROR;
|
|
return XXH_OK;
|
|
}
|
|
|
|
XXH_PUBLIC_API XXH_errorcode
|
|
XXH3_128bits_reset_withSeed(XXH3_state_t* statePtr, XXH64_hash_t seed)
|
|
{
|
|
if (statePtr == NULL) return XXH_ERROR;
|
|
XXH3_128bits_reset_internal(statePtr, seed, kSecret, XXH_SECRET_DEFAULT_SIZE);
|
|
XXH3_initCustomSecret(statePtr->customSecret, seed);
|
|
statePtr->secret = statePtr->customSecret;
|
|
return XXH_OK;
|
|
}
|
|
|
|
XXH_PUBLIC_API XXH_errorcode
|
|
XXH3_128bits_update(XXH3_state_t* state, const void* input, size_t len)
|
|
{
|
|
return XXH3_update(state, (const xxh_u8*)input, len, XXH3_acc_128bits);
|
|
}
|
|
|
|
XXH_PUBLIC_API XXH128_hash_t XXH3_128bits_digest (const XXH3_state_t* state)
|
|
{
|
|
if (state->totalLen > XXH3_MIDSIZE_MAX) {
|
|
XXH_ALIGN(XXH_ACC_ALIGN) XXH64_hash_t acc[ACC_NB];
|
|
XXH3_digest_long(acc, state, XXH3_acc_128bits);
|
|
XXH_ASSERT(state->secretLimit + STRIPE_LEN >= sizeof(acc) + XXH_SECRET_MERGEACCS_START);
|
|
{ XXH128_hash_t h128;
|
|
h128.low64 = XXH3_mergeAccs(acc,
|
|
state->secret + XXH_SECRET_MERGEACCS_START,
|
|
(xxh_u64)state->totalLen * PRIME64_1);
|
|
h128.high64 = XXH3_mergeAccs(acc,
|
|
state->secret + state->secretLimit + STRIPE_LEN
|
|
- sizeof(acc) - XXH_SECRET_MERGEACCS_START,
|
|
~((xxh_u64)state->totalLen * PRIME64_2));
|
|
return h128;
|
|
}
|
|
}
|
|
/* len <= XXH3_MIDSIZE_MAX : short code */
|
|
if (state->seed)
|
|
return XXH3_128bits_withSeed(state->buffer, (size_t)state->totalLen, state->seed);
|
|
return XXH3_128bits_withSecret(state->buffer, (size_t)(state->totalLen),
|
|
state->secret, state->secretLimit + STRIPE_LEN);
|
|
}
|
|
|
|
/* 128-bit utility functions */
|
|
|
|
#include <string.h> /* memcmp, memcpy */
|
|
|
|
/* return : 1 is equal, 0 if different */
|
|
XXH_PUBLIC_API int XXH128_isEqual(XXH128_hash_t h1, XXH128_hash_t h2)
|
|
{
|
|
/* note : XXH128_hash_t is compact, it has no padding byte */
|
|
return !(memcmp(&h1, &h2, sizeof(h1)));
|
|
}
|
|
|
|
/* This prototype is compatible with stdlib's qsort().
|
|
* return : >0 if *h128_1 > *h128_2
|
|
* <0 if *h128_1 < *h128_2
|
|
* =0 if *h128_1 == *h128_2 */
|
|
XXH_PUBLIC_API int XXH128_cmp(const void* h128_1, const void* h128_2)
|
|
{
|
|
XXH128_hash_t const h1 = *(const XXH128_hash_t*)h128_1;
|
|
XXH128_hash_t const h2 = *(const XXH128_hash_t*)h128_2;
|
|
int const hcmp = (h1.high64 > h2.high64) - (h2.high64 > h1.high64);
|
|
/* note : bets that, in most cases, hash values are different */
|
|
if (hcmp) return hcmp;
|
|
return (h1.low64 > h2.low64) - (h2.low64 > h1.low64);
|
|
}
|
|
|
|
|
|
/*====== Canonical representation ======*/
|
|
XXH_PUBLIC_API void
|
|
XXH128_canonicalFromHash(XXH128_canonical_t* dst, XXH128_hash_t hash)
|
|
{
|
|
XXH_STATIC_ASSERT(sizeof(XXH128_canonical_t) == sizeof(XXH128_hash_t));
|
|
if (XXH_CPU_LITTLE_ENDIAN) {
|
|
hash.high64 = XXH_swap64(hash.high64);
|
|
hash.low64 = XXH_swap64(hash.low64);
|
|
}
|
|
memcpy(dst, &hash.high64, sizeof(hash.high64));
|
|
memcpy((char*)dst + sizeof(hash.high64), &hash.low64, sizeof(hash.low64));
|
|
}
|
|
|
|
XXH_PUBLIC_API XXH128_hash_t
|
|
XXH128_hashFromCanonical(const XXH128_canonical_t* src)
|
|
{
|
|
XXH128_hash_t h;
|
|
h.high64 = XXH_readBE64(src);
|
|
h.low64 = XXH_readBE64(src->digest + 8);
|
|
return h;
|
|
}
|
|
|
|
/* Pop our optimization override from above */
|
|
#if XXH_VECTOR == XXH_AVX2 /* AVX2 */ \
|
|
&& defined(__GNUC__) && !defined(__clang__) /* GCC, not Clang */ \
|
|
&& defined(__OPTIMIZE__) && !defined(__OPTIMIZE_SIZE__) /* respect -O0 and -Os */
|
|
# pragma GCC pop_options
|
|
#endif
|
|
|
|
#endif /* XXH3_H_1397135465 */
|