From 7c8ac5a01b4ba5d4c7060875ea024e6efbc12893 Mon Sep 17 00:00:00 2001 From: Yang Guo Date: Thu, 10 Jan 2019 12:39:59 +0100 Subject: deps: cherry-pick c736883 from upstream V8 Original commit message: Optionally use halfsiphash for integer hashing. Change-Id: Ibd14f7b3fe78635675c76ae864112e3a3a7bc701 Reviewed-on: https://chromium-review.googlesource.com/c/1382463 Commit-Queue: Yang Guo Reviewed-by: Benedikt Meurer Cr-Commit-Position: refs/heads/master@{#58674} Refs: https://github.com/v8/v8/commit/c736883ed4e3ff92d1fd5a60497cec5311df9a25 --- deps/v8/src/third_party/siphash/LICENSE | 116 +++++++++++++++++++++++++ deps/v8/src/third_party/siphash/halfsiphash.cc | 83 ++++++++++++++++++ deps/v8/src/third_party/siphash/halfsiphash.h | 17 ++++ deps/v8/src/utils.h | 5 ++ 4 files changed, 221 insertions(+) create mode 100644 deps/v8/src/third_party/siphash/LICENSE create mode 100644 deps/v8/src/third_party/siphash/halfsiphash.cc create mode 100644 deps/v8/src/third_party/siphash/halfsiphash.h (limited to 'deps/v8/src') diff --git a/deps/v8/src/third_party/siphash/LICENSE b/deps/v8/src/third_party/siphash/LICENSE new file mode 100644 index 0000000000..670154e353 --- /dev/null +++ b/deps/v8/src/third_party/siphash/LICENSE @@ -0,0 +1,116 @@ +CC0 1.0 Universal + +Statement of Purpose + +The laws of most jurisdictions throughout the world automatically confer +exclusive Copyright and Related Rights (defined below) upon the creator and +subsequent owner(s) (each and all, an "owner") of an original work of +authorship and/or a database (each, a "Work"). + +Certain owners wish to permanently relinquish those rights to a Work for the +purpose of contributing to a commons of creative, cultural and scientific +works ("Commons") that the public can reliably and without fear of later +claims of infringement build upon, modify, incorporate in other works, reuse +and redistribute as freely as possible in any form whatsoever and for any +purposes, including without limitation commercial purposes. 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If not, see + * . + */ + +/* + * Originally taken from https://github.com/veorq/SipHash/ + * Altered to match V8's use case. + */ + +#include + +#include "src/base/logging.h" +#include "src/base/v8-fallthrough.h" + +#define ROTL(x, b) (uint32_t)(((x) << (b)) | ((x) >> (32 - (b)))) + +#define SIPROUND \ + do { \ + v0 += v1; \ + v1 = ROTL(v1, 5); \ + v1 ^= v0; \ + v0 = ROTL(v0, 16); \ + v2 += v3; \ + v3 = ROTL(v3, 8); \ + v3 ^= v2; \ + v0 += v3; \ + v3 = ROTL(v3, 7); \ + v3 ^= v0; \ + v2 += v1; \ + v1 = ROTL(v1, 13); \ + v1 ^= v2; \ + v2 = ROTL(v2, 16); \ + } while (0) + +// Simplified half-siphash-2-4 implementation for 4 byte input. +uint32_t halfsiphash(const uint32_t value, const uint64_t seed) { + uint32_t v0 = 0; + uint32_t v1 = 0; + uint32_t v2 = 0x6c796765; + uint32_t v3 = 0x74656462; + uint32_t k[2]; + memcpy(k, &seed, sizeof(seed)); + uint32_t b = 4 << 24; + v3 ^= k[1]; + v2 ^= k[0]; + v1 ^= k[1]; + v0 ^= k[0]; + + v3 ^= value; + + // 2 c-rounds + SIPROUND; + SIPROUND; + + v0 ^= value; + v3 ^= b; + + // 2 c-rounds + SIPROUND; + SIPROUND; + + v0 ^= b; + v2 ^= 0xff; + + // 4 d-rounds + SIPROUND; + SIPROUND; + SIPROUND; + SIPROUND; + + b = v1 ^ v3; + return b; +} diff --git a/deps/v8/src/third_party/siphash/halfsiphash.h b/deps/v8/src/third_party/siphash/halfsiphash.h new file mode 100644 index 0000000000..7b55115774 --- /dev/null +++ b/deps/v8/src/third_party/siphash/halfsiphash.h @@ -0,0 +1,17 @@ +/* + * SipHash reference C implementation + * + * Copyright (c) 2016 Jean-Philippe Aumasson + * + * To the extent possible under law, the author(s) have dedicated all + * copyright and related and neighboring rights to this software to the public + * domain worldwide. This software is distributed without any warranty. + * + * You should have received a copy of the CC0 Public Domain Dedication along + * with this software. If not, see + * . + */ + +#include + +uint32_t halfsiphash(const uint32_t value, const uint64_t seed); diff --git a/deps/v8/src/utils.h b/deps/v8/src/utils.h index 90a1227a2b..51c22ffd70 100644 --- a/deps/v8/src/utils.h +++ b/deps/v8/src/utils.h @@ -22,6 +22,7 @@ #include "src/base/platform/platform.h" #include "src/base/v8-fallthrough.h" #include "src/globals.h" +#include "src/third_party/siphash/halfsiphash.h" #include "src/vector.h" #if defined(V8_OS_AIX) @@ -513,7 +514,11 @@ inline uint32_t ComputeLongHash(uint64_t key) { } inline uint32_t ComputeSeededHash(uint32_t key, uint64_t seed) { +#ifdef V8_USE_SIPHASH + return halfsiphash(key, seed); +#else return ComputeLongHash(static_cast(key) ^ seed); +#endif // V8_USE_SIPHASH } inline uint32_t ComputePointerHash(void* ptr) { -- cgit v1.2.3