[llvm] r282493 - Add xxhash to llvm.
Rafael Espindola via llvm-commits
llvm-commits at lists.llvm.org
Tue Sep 27 08:45:57 PDT 2016
Author: rafael
Date: Tue Sep 27 10:45:57 2016
New Revision: 282493
URL: http://llvm.org/viewvc/llvm-project?rev=282493&view=rev
Log:
Add xxhash to llvm.
It will be used for fast fingerprinting in lld at least.
Added:
llvm/trunk/include/llvm/Support/xxhash.h
llvm/trunk/lib/Support/xxhash.cpp
llvm/trunk/unittests/Support/xxhashTest.cpp
Modified:
llvm/trunk/lib/Support/CMakeLists.txt
llvm/trunk/unittests/Support/CMakeLists.txt
Added: llvm/trunk/include/llvm/Support/xxhash.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Support/xxhash.h?rev=282493&view=auto
==============================================================================
--- llvm/trunk/include/llvm/Support/xxhash.h (added)
+++ llvm/trunk/include/llvm/Support/xxhash.h Tue Sep 27 10:45:57 2016
@@ -0,0 +1,47 @@
+/*
+ xxHash - Extremely Fast Hash algorithm
+ Header File
+ Copyright (C) 2012-2016, Yann Collet.
+
+ BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are
+ met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the following disclaimer
+ in the documentation and/or other materials provided with the
+ distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+ You can contact the author at :
+ - xxHash source repository : https://github.com/Cyan4973/xxHash
+*/
+
+/* based on revision d2df04efcbef7d7f6886d345861e5dfda4edacc1 Removed
+ * everything but a simple interface for computing XXh64. */
+
+#ifndef LLVM_SUPPORT_XXHASH_H
+#define LLVM_SUPPORT_XXHASH_H
+
+#include "llvm/ADT/StringRef.h"
+
+namespace llvm {
+uint64_t xxHash64(llvm::StringRef Data);
+}
+
+#endif
Modified: llvm/trunk/lib/Support/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/CMakeLists.txt?rev=282493&r1=282492&r2=282493&view=diff
==============================================================================
--- llvm/trunk/lib/Support/CMakeLists.txt (original)
+++ llvm/trunk/lib/Support/CMakeLists.txt Tue Sep 27 10:45:57 2016
@@ -106,6 +106,7 @@ add_llvm_library(LLVMSupport
regexec.c
regfree.c
regstrlcpy.c
+ xxhash.cpp
# System
Atomic.cpp
Added: llvm/trunk/lib/Support/xxhash.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/xxhash.cpp?rev=282493&view=auto
==============================================================================
--- llvm/trunk/lib/Support/xxhash.cpp (added)
+++ llvm/trunk/lib/Support/xxhash.cpp Tue Sep 27 10:45:57 2016
@@ -0,0 +1,134 @@
+/*
+* xxHash - Fast Hash algorithm
+* Copyright (C) 2012-2016, Yann Collet
+*
+* BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions are
+* met:
+*
+* * Redistributions of source code must retain the above copyright
+* notice, this list of conditions and the following disclaimer.
+* * Redistributions in binary form must reproduce the above
+* copyright notice, this list of conditions and the following disclaimer
+* in the documentation and/or other materials provided with the
+* distribution.
+*
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*
+* You can contact the author at :
+* - xxHash homepage: http://www.xxhash.com
+* - xxHash source repository : https://github.com/Cyan4973/xxHash
+*/
+
+/* based on revision d2df04efcbef7d7f6886d345861e5dfda4edacc1 Removed
+ * everything but a simple interface for computing XXh64. */
+
+#include "llvm/Support/xxhash.h"
+#include "llvm/Support/Endian.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+using namespace llvm;
+using namespace support;
+
+static uint64_t rotl64(uint64_t X, size_t R) {
+ return (X << R) | (X >> (64 - R));
+}
+
+static const uint64_t PRIME64_1 = 11400714785074694791ULL;
+static const uint64_t PRIME64_2 = 14029467366897019727ULL;
+static const uint64_t PRIME64_3 = 1609587929392839161ULL;
+static const uint64_t PRIME64_4 = 9650029242287828579ULL;
+static const uint64_t PRIME64_5 = 2870177450012600261ULL;
+
+static uint64_t round(uint64_t Acc, uint64_t Input) {
+ Acc += Input * PRIME64_2;
+ Acc = rotl64(Acc, 31);
+ Acc *= PRIME64_1;
+ return Acc;
+}
+
+static uint64_t mergeRound(uint64_t Acc, uint64_t Val) {
+ Val = round(0, Val);
+ Acc ^= Val;
+ Acc = Acc * PRIME64_1 + PRIME64_4;
+ return Acc;
+}
+
+uint64_t llvm::xxHash64(StringRef Data) {
+ size_t Len = Data.size();
+ uint64_t Seed = 0;
+ const char *P = Data.data();
+ const char *const BEnd = P + Len;
+ uint64_t H64;
+
+ if (Len >= 32) {
+ const char *const Limit = BEnd - 32;
+ uint64_t V1 = Seed + PRIME64_1 + PRIME64_2;
+ uint64_t V2 = Seed + PRIME64_2;
+ uint64_t V3 = Seed + 0;
+ uint64_t V4 = Seed - PRIME64_1;
+
+ do {
+ V1 = round(V1, endian::read64le(P));
+ P += 8;
+ V2 = round(V2, endian::read64le(P));
+ P += 8;
+ V3 = round(V3, endian::read64le(P));
+ P += 8;
+ V4 = round(V4, endian::read64le(P));
+ P += 8;
+ } while (P <= Limit);
+
+ H64 = rotl64(V1, 1) + rotl64(V2, 7) + rotl64(V3, 12) + rotl64(V4, 18);
+ H64 = mergeRound(H64, V1);
+ H64 = mergeRound(H64, V2);
+ H64 = mergeRound(H64, V3);
+ H64 = mergeRound(H64, V4);
+
+ } else {
+ H64 = Seed + PRIME64_5;
+ }
+
+ H64 += (uint64_t)Len;
+
+ while (P + 8 <= BEnd) {
+ uint64_t const K1 = round(0, endian::read64le(P));
+ H64 ^= K1;
+ H64 = rotl64(H64, 27) * PRIME64_1 + PRIME64_4;
+ P += 8;
+ }
+
+ if (P + 4 <= BEnd) {
+ H64 ^= (uint64_t)(endian::read32le(P)) * PRIME64_1;
+ H64 = rotl64(H64, 23) * PRIME64_2 + PRIME64_3;
+ P += 4;
+ }
+
+ while (P < BEnd) {
+ H64 ^= (*P) * PRIME64_5;
+ H64 = rotl64(H64, 11) * PRIME64_1;
+ P++;
+ }
+
+ H64 ^= H64 >> 33;
+ H64 *= PRIME64_2;
+ H64 ^= H64 >> 29;
+ H64 *= PRIME64_3;
+ H64 ^= H64 >> 32;
+
+ return H64;
+}
Modified: llvm/trunk/unittests/Support/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/unittests/Support/CMakeLists.txt?rev=282493&r1=282492&r2=282493&view=diff
==============================================================================
--- llvm/trunk/unittests/Support/CMakeLists.txt (original)
+++ llvm/trunk/unittests/Support/CMakeLists.txt Tue Sep 27 10:45:57 2016
@@ -52,6 +52,7 @@ add_llvm_unittest(SupportTests
raw_ostream_test.cpp
raw_pwrite_stream_test.cpp
raw_sha1_ostream_test.cpp
+ xxhashTest.cpp
)
# ManagedStatic.cpp uses <pthread>.
Added: llvm/trunk/unittests/Support/xxhashTest.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/unittests/Support/xxhashTest.cpp?rev=282493&view=auto
==============================================================================
--- llvm/trunk/unittests/Support/xxhashTest.cpp (added)
+++ llvm/trunk/unittests/Support/xxhashTest.cpp Tue Sep 27 10:45:57 2016
@@ -0,0 +1,20 @@
+//===- llvm/unittest/Support/xxhashTest.cpp -------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/xxhash.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+TEST(xxhashTest, Basic) {
+ EXPECT_EQ(0x33bf00a859c4ba3fU, xxHash64("foo"));
+ EXPECT_EQ(0x48a37c90ad27a659U, xxHash64("bar"));
+ EXPECT_EQ(0x69196c1b3af0bff9U,
+ xxHash64("0123456789abcdefghijklmnopqrstuvwxyz"));
+}
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