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rocksdb/util/hash_test.cc
Peter Dillinger 18f57f5ef8 Add new persistent 64-bit hash (#5984) 
Summary:
For upcoming new SST filter implementations, we will use a new
64-bit hash function (XXH3 preview, slightly modified). This change
updates hash.{h,cc} for that change, adds unit tests, and out-of-lines
the implementations to keep hash.h as clean/small as possible.

In developing the unit tests, I discovered that the XXH3 preview always
returns zero for the empty string. Zero is problematic for some
algorithms (including an upcoming SST filter implementation) if it
occurs more often than at the "natural" rate, so it should not be
returned from trivial values using trivial seeds. I modified our fork
of XXH3 to return a modest hash of the seed for the empty string.

With hash function details out-of-lines in hash.h, it makes sense to
enable XXH_INLINE_ALL, so that direct calls to XXH64/XXH32/XXH3p
are inlined. To fix array-bounds warnings on some inline calls, I
injected some casts to uintptr_t in xxhash.cc. (Issue reported to Yann.)
Revised: Reverted using XXH_INLINE_ALL for now.  Some Facebook
checks are unhappy about #include on xxhash.cc file. I would
fix that by rename to xxhash_cc.h, but to best preserve history I want
to do that in a separate commit (PR) from the uintptr casts.

Also updated filter_bench for this change, improving the performance
predictability of dry run hashing and adding support for 64-bit hash
(for upcoming new SST filter implementations, minor dead code in the
tool for now).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5984

Differential Revision: D18246567

Pulled By: pdillinger

fbshipit-source-id: 6162fbf6381d63c8cc611dd7ec70e1ddc883fbb8
2019-10-31 16:36:35 -07:00

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
// Copyright (c) 2012 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include <cstring>
#include <vector>
#include "test_util/testharness.h"
#include "util/coding.h"
#include "util/hash.h"
using rocksdb::EncodeFixed32;
using rocksdb::GetSliceHash64;
using rocksdb::Hash;
using rocksdb::Hash64;
using rocksdb::Lower32of64;
using rocksdb::Upper32of64;
using rocksdb::Slice;
// The hash algorithm is part of the file format, for example for the Bloom
// filters. Test that the hash values are stable for a set of random strings of
// varying lengths.
TEST(HashTest, Values) {
constexpr uint32_t kSeed = 0xbc9f1d34; // Same as BloomHash.
EXPECT_EQ(Hash("", 0, kSeed), 3164544308u);
EXPECT_EQ(Hash("\x08", 1, kSeed), 422599524u);
EXPECT_EQ(Hash("\x17", 1, kSeed), 3168152998u);
EXPECT_EQ(Hash("\x9a", 1, kSeed), 3195034349u);
EXPECT_EQ(Hash("\x1c", 1, kSeed), 2651681383u);
EXPECT_EQ(Hash("\x4d\x76", 2, kSeed), 2447836956u);
EXPECT_EQ(Hash("\x52\xd5", 2, kSeed), 3854228105u);
EXPECT_EQ(Hash("\x91\xf7", 2, kSeed), 31066776u);
EXPECT_EQ(Hash("\xd6\x27", 2, kSeed), 1806091603u);
EXPECT_EQ(Hash("\x30\x46\x0b", 3, kSeed), 3808221797u);
EXPECT_EQ(Hash("\x56\xdc\xd6", 3, kSeed), 2157698265u);
EXPECT_EQ(Hash("\xd4\x52\x33", 3, kSeed), 1721992661u);
EXPECT_EQ(Hash("\x6a\xb5\xf4", 3, kSeed), 2469105222u);
EXPECT_EQ(Hash("\x67\x53\x81\x1c", 4, kSeed), 118283265u);
EXPECT_EQ(Hash("\x69\xb8\xc0\x88", 4, kSeed), 3416318611u);
EXPECT_EQ(Hash("\x1e\x84\xaf\x2d", 4, kSeed), 3315003572u);
EXPECT_EQ(Hash("\x46\xdc\x54\xbe", 4, kSeed), 447346355u);
EXPECT_EQ(Hash("\xd0\x7a\x6e\xea\x56", 5, kSeed), 4255445370u);
EXPECT_EQ(Hash("\x86\x83\xd5\xa4\xd8", 5, kSeed), 2390603402u);
EXPECT_EQ(Hash("\xb7\x46\xbb\x77\xce", 5, kSeed), 2048907743u);
EXPECT_EQ(Hash("\x6c\xa8\xbc\xe5\x99", 5, kSeed), 2177978500u);
EXPECT_EQ(Hash("\x5c\x5e\xe1\xa0\x73\x81", 6, kSeed), 1036846008u);
EXPECT_EQ(Hash("\x08\x5d\x73\x1c\xe5\x2e", 6, kSeed), 229980482u);
EXPECT_EQ(Hash("\x42\xfb\xf2\x52\xb4\x10", 6, kSeed), 3655585422u);
EXPECT_EQ(Hash("\x73\xe1\xff\x56\x9c\xce", 6, kSeed), 3502708029u);
EXPECT_EQ(Hash("\x5c\xbe\x97\x75\x54\x9a\x52", 7, kSeed), 815120748u);
EXPECT_EQ(Hash("\x16\x82\x39\x49\x88\x2b\x36", 7, kSeed), 3056033698u);
EXPECT_EQ(Hash("\x59\x77\xf0\xa7\x24\xf4\x78", 7, kSeed), 587205227u);
EXPECT_EQ(Hash("\xd3\xa5\x7c\x0e\xc0\x02\x07", 7, kSeed), 2030937252u);
EXPECT_EQ(Hash("\x31\x1b\x98\x75\x96\x22\xd3\x9a", 8, kSeed), 469635402u);
EXPECT_EQ(Hash("\x38\xd6\xf7\x28\x20\xb4\x8a\xe9", 8, kSeed), 3530274698u);
EXPECT_EQ(Hash("\xbb\x18\x5d\xf4\x12\x03\xf7\x99", 8, kSeed), 1974545809u);
EXPECT_EQ(Hash("\x80\xd4\x3b\x3b\xae\x22\xa2\x78", 8, kSeed), 3563570120u);
EXPECT_EQ(Hash("\x1a\xb5\xd0\xfe\xab\xc3\x61\xb2\x99", 9, kSeed),
2706087434u);
EXPECT_EQ(Hash("\x8e\x4a\xc3\x18\x20\x2f\x06\xe6\x3c", 9, kSeed),
1534654151u);
EXPECT_EQ(Hash("\xb6\xc0\xdd\x05\x3f\xc4\x86\x4c\xef", 9, kSeed),
2355554696u);
EXPECT_EQ(Hash("\x9a\x5f\x78\x0d\xaf\x50\xe1\x1f\x55", 9, kSeed),
1400800912u);
EXPECT_EQ(Hash("\x22\x6f\x39\x1f\xf8\xdd\x4f\x52\x17\x94", 10, kSeed),
3420325137u);
EXPECT_EQ(Hash("\x32\x89\x2a\x75\x48\x3a\x4a\x02\x69\xdd", 10, kSeed),
3427803584u);
EXPECT_EQ(Hash("\x06\x92\x5c\xf4\x88\x0e\x7e\x68\x38\x3e", 10, kSeed),
1152407945u);
EXPECT_EQ(Hash("\xbd\x2c\x63\x38\xbf\xe9\x78\xb7\xbf\x15", 10, kSeed),
3382479516u);
}
// The hash algorithm is part of the file format, for example for the Bloom
// filters.
TEST(HashTest, Hash64Misc) {
constexpr uint32_t kSeed = 0; // Same as GetSliceHash64
for (char fill : {'\0', 'a', '1', '\xff'}) {
const size_t max_size = 1000;
const std::string str(max_size, fill);
for (size_t size = 0; size <= max_size; ++size) {
uint64_t here = Hash64(str.data(), size, kSeed);
// Must be same as GetSliceHash64
EXPECT_EQ(here, GetSliceHash64(Slice(str.data(), size)));
// Upper and Lower must reconstruct hash
EXPECT_EQ(here, (uint64_t{Upper32of64(here)} << 32) | Lower32of64(here));
EXPECT_EQ(here, (uint64_t{Upper32of64(here)} << 32) + Lower32of64(here));
EXPECT_EQ(here, (uint64_t{Upper32of64(here)} << 32) ^ Lower32of64(here));
// Seed changes hash value (with high probability)
for (uint64_t var_seed = 1; var_seed != 0; var_seed <<= 1) {
EXPECT_NE(here, Hash64(str.data(), size, var_seed));
}
// Size changes hash value (with high probability)
size_t max_smaller_by = std::min(size_t{30}, size);
for (size_t smaller_by = 1; smaller_by <= max_smaller_by; ++smaller_by) {
EXPECT_NE(here, Hash64(str.data(), size - smaller_by, kSeed));
}
}
}
}
// Test that hash values are "non-trivial" for "trivial" inputs
TEST(HashTest, Hash64Trivial) {
// Thorough test too slow for regression testing
constexpr bool thorough = false;
// For various seeds, make sure hash of empty string is not zero.
constexpr uint64_t max_seed = thorough ? 0x1000000 : 0x10000;
for (uint64_t seed = 0; seed < max_seed; ++seed) {
uint64_t here = Hash64("", 0, seed);
EXPECT_NE(Lower32of64(here), 0u);
EXPECT_NE(Upper32of64(here), 0u);
}
// For standard seed, make sure hash of small strings are not zero
constexpr uint32_t kSeed = 0; // Same as GetSliceHash64
char input[4];
constexpr int max_len = thorough ? 3 : 2;
for (int len = 1; len <= max_len; ++len) {
for (uint32_t i = 0; (i >> (len * 8)) == 0; ++i) {
EncodeFixed32(input, i);
uint64_t here = Hash64(input, len, kSeed);
EXPECT_NE(Lower32of64(here), 0u);
EXPECT_NE(Upper32of64(here), 0u);
}
}
}
// Test that the hash values are stable for a set of random strings of
// varying small lengths.
TEST(HashTest, Hash64SmallValueSchema) {
constexpr uint32_t kSeed = 0; // Same as GetSliceHash64
EXPECT_EQ(Hash64("", 0, kSeed), uint64_t{5999572062939766020u});
EXPECT_EQ(Hash64("\x08", 1, kSeed), uint64_t{583283813901344696u});
EXPECT_EQ(Hash64("\x17", 1, kSeed), uint64_t{16175549975585474943u});
EXPECT_EQ(Hash64("\x9a", 1, kSeed), uint64_t{16322991629225003903u});
EXPECT_EQ(Hash64("\x1c", 1, kSeed), uint64_t{13269285487706833447u});
EXPECT_EQ(Hash64("\x4d\x76", 2, kSeed), uint64_t{6859542833406258115u});
EXPECT_EQ(Hash64("\x52\xd5", 2, kSeed), uint64_t{4919611532550636959u});
EXPECT_EQ(Hash64("\x91\xf7", 2, kSeed), uint64_t{14199427467559720719u});
EXPECT_EQ(Hash64("\xd6\x27", 2, kSeed), uint64_t{12292689282614532691u});
EXPECT_EQ(Hash64("\x30\x46\x0b", 3, kSeed), uint64_t{11404699285340020889u});
EXPECT_EQ(Hash64("\x56\xdc\xd6", 3, kSeed), uint64_t{12404347133785524237u});
EXPECT_EQ(Hash64("\xd4\x52\x33", 3, kSeed), uint64_t{15853805298481534034u});
EXPECT_EQ(Hash64("\x6a\xb5\xf4", 3, kSeed), uint64_t{16863488758399383382u});
EXPECT_EQ(Hash64("\x67\x53\x81\x1c", 4, kSeed),
uint64_t{9010661983527562386u});
EXPECT_EQ(Hash64("\x69\xb8\xc0\x88", 4, kSeed),
uint64_t{6611781377647041447u});
EXPECT_EQ(Hash64("\x1e\x84\xaf\x2d", 4, kSeed),
uint64_t{15290969111616346501u});
EXPECT_EQ(Hash64("\x46\xdc\x54\xbe", 4, kSeed),
uint64_t{7063754590279313623u});
EXPECT_EQ(Hash64("\xd0\x7a\x6e\xea\x56", 5, kSeed),
uint64_t{6384167718754869899u});
EXPECT_EQ(Hash64("\x86\x83\xd5\xa4\xd8", 5, kSeed),
uint64_t{16874407254108011067u});
EXPECT_EQ(Hash64("\xb7\x46\xbb\x77\xce", 5, kSeed),
uint64_t{16809880630149135206u});
EXPECT_EQ(Hash64("\x6c\xa8\xbc\xe5\x99", 5, kSeed),
uint64_t{1249038833153141148u});
EXPECT_EQ(Hash64("\x5c\x5e\xe1\xa0\x73\x81", 6, kSeed),
uint64_t{17358142495308219330u});
EXPECT_EQ(Hash64("\x08\x5d\x73\x1c\xe5\x2e", 6, kSeed),
uint64_t{4237646583134806322u});
EXPECT_EQ(Hash64("\x42\xfb\xf2\x52\xb4\x10", 6, kSeed),
uint64_t{4373664924115234051u});
EXPECT_EQ(Hash64("\x73\xe1\xff\x56\x9c\xce", 6, kSeed),
uint64_t{12012981210634596029u});
EXPECT_EQ(Hash64("\x5c\xbe\x97\x75\x54\x9a\x52", 7, kSeed),
uint64_t{5716522398211028826u});
EXPECT_EQ(Hash64("\x16\x82\x39\x49\x88\x2b\x36", 7, kSeed),
uint64_t{15604531309862565013u});
EXPECT_EQ(Hash64("\x59\x77\xf0\xa7\x24\xf4\x78", 7, kSeed),
uint64_t{8601330687345614172u});
EXPECT_EQ(Hash64("\xd3\xa5\x7c\x0e\xc0\x02\x07", 7, kSeed),
uint64_t{8088079329364056942u});
EXPECT_EQ(Hash64("\x31\x1b\x98\x75\x96\x22\xd3\x9a", 8, kSeed),
uint64_t{9844314944338447628u});
EXPECT_EQ(Hash64("\x38\xd6\xf7\x28\x20\xb4\x8a\xe9", 8, kSeed),
uint64_t{10973293517982163143u});
EXPECT_EQ(Hash64("\xbb\x18\x5d\xf4\x12\x03\xf7\x99", 8, kSeed),
uint64_t{9986007080564743219u});
EXPECT_EQ(Hash64("\x80\xd4\x3b\x3b\xae\x22\xa2\x78", 8, kSeed),
uint64_t{1729303145008254458u});
EXPECT_EQ(Hash64("\x1a\xb5\xd0\xfe\xab\xc3\x61\xb2\x99", 9, kSeed),
uint64_t{13253403748084181481u});
EXPECT_EQ(Hash64("\x8e\x4a\xc3\x18\x20\x2f\x06\xe6\x3c", 9, kSeed),
uint64_t{7768754303876232188u});
EXPECT_EQ(Hash64("\xb6\xc0\xdd\x05\x3f\xc4\x86\x4c\xef", 9, kSeed),
uint64_t{12439346786701492u});
EXPECT_EQ(Hash64("\x9a\x5f\x78\x0d\xaf\x50\xe1\x1f\x55", 9, kSeed),
uint64_t{10841838338450144690u});
EXPECT_EQ(Hash64("\x22\x6f\x39\x1f\xf8\xdd\x4f\x52\x17\x94", 10, kSeed),
uint64_t{12883919702069153152u});
EXPECT_EQ(Hash64("\x32\x89\x2a\x75\x48\x3a\x4a\x02\x69\xdd", 10, kSeed),
uint64_t{12692903507676842188u});
EXPECT_EQ(Hash64("\x06\x92\x5c\xf4\x88\x0e\x7e\x68\x38\x3e", 10, kSeed),
uint64_t{6540985900674032620u});
EXPECT_EQ(Hash64("\xbd\x2c\x63\x38\xbf\xe9\x78\xb7\xbf\x15", 10, kSeed),
uint64_t{10551812464348219044u});
}
std::string Hash64TestDescriptor(const char *repeat, size_t limit) {
const char *mod61_encode =
"abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
std::string input;
while (input.size() < limit) {
input.append(repeat);
}
std::string rv;
for (size_t i = 0; i < limit; ++i) {
uint64_t h = GetSliceHash64(Slice(input.data(), i));
rv.append(1, mod61_encode[static_cast<size_t>(h % 61)]);
}
return rv;
}
// XXH3p changes its algorithm for various sizes up through 250 bytes, so
// we need to check the stability of larger sizes also.
TEST(HashTest, Hash64LargeValueSchema) {
// Each of these derives a "descriptor" from the hash values for all
// lengths up to 430.
// Note that "c" is common for the zero-length string.
EXPECT_EQ(
Hash64TestDescriptor("foo", 430),
"cRhyWsY67B6klRA1udmOuiYuX7IthyGBKqbeosz2hzVglWCmQx8nEdnpkvPfYX56Up2OWOTV"
"lTzfAoYwvtqKzjD8E9xttR2unelbXbIV67NUe6bOO23BxaSFRcA3njGu5cUWfgwOqNoTsszp"
"uPvKRP6qaUR5VdoBkJUCFIefd7edlNK5mv6JYWaGdwxehg65hTkTmjZoPKxTZo4PLyzbL9U4"
"xt12ITSfeP2MfBHuLI2z2pDlBb44UQKVMx27LEoAHsdLp3WfWfgH3sdRBRCHm33UxCM4QmE2"
"xJ7gqSvNwTeH7v9GlC8zWbGroyD3UVNeShMLx29O7tH1biemLULwAHyIw8zdtLMDpEJ8m2ic"
"l6Lb4fDuuFNAs1GCVUthjK8CV8SWI8Rsz5THSwn5CGhpqUwSZcFknjwWIl5rNCvDxXJqYr");
// Note that "1EeRk" is common for "Rocks"
EXPECT_EQ(
Hash64TestDescriptor("Rocks", 430),
"c1EeRkrzgOYWLA8PuhJrwTePJewoB44WdXYDfhbk3ZxTqqg25WlPExDl7IKIQLJvnA6gJxxn"
"9TCSLkFGfJeXehaSS1GBqWSzfhEH4VXiXIUCuxJXxtKXcSC6FrNIQGTZbYDiUOLD6Y5inzrF"
"9etwQhXUBanw55xAUdNMFQAm2GjJ6UDWp2mISLiMMkLjANWMKLaZMqaFLX37qB4MRO1ooVRv"
"zSvaNRSCLxlggQCasQq8icWjzf3HjBlZtU6pd4rkaUxSzHqmo9oM5MghbU5Rtxg8wEfO7lVN"
"5wdMONYecslQTwjZUpO1K3LDf3K3XK6sUXM6ShQQ3RHmMn2acB4YtTZ3QQcHYJSOHn2DuWpa"
"Q8RqzX5lab92YmOLaCdOHq1BPsM7SIBzMdLgePNsJ1vvMALxAaoDUHPxoFLO2wx18IXnyX");
EXPECT_EQ(
Hash64TestDescriptor("RocksDB", 430),
"c1EeRkukbkb28wLTahwD2sfUhZzaBEnF8SVrxnPVB6A7b8CaAl3UKsDZISF92GSq2wDCukOq"
"Jgrsp7A3KZhDiLW8dFXp8UPqPxMCRlMdZeVeJ2dJxrmA6cyt99zkQFj7ELbut6jAeVqARFnw"
"fnWVXOsaLrq7bDCbMcns2DKvTaaqTCLMYxI7nhtLpFN1jR755FRQFcOzrrDbh7QhypjdvlYw"
"cdAMSZgp9JMHxbM23wPSuH6BOFgxejz35PScZfhDPvTOxIy1jc3MZsWrMC3P324zNolO7JdW"
"CX2I5UDKjjaEJfxbgVgJIXxtQGlmj2xkO5sPpjULQV4X2HlY7FQleJ4QRaJIB4buhCA4vUTF"
"eMFlxCIYUpTCsal2qsmnGOWa8WCcefrohMjDj1fjzSvSaQwlpyR1GZHF2uPOoQagiCpHpm");
}
TEST(Fastrange32Test, Values) {
using rocksdb::fastrange32;
// Zero range
EXPECT_EQ(fastrange32(0, 0), 0U);
EXPECT_EQ(fastrange32(123, 0), 0U);
EXPECT_EQ(fastrange32(0xffffffff, 0), 0U);
// One range
EXPECT_EQ(fastrange32(0, 1), 0U);
EXPECT_EQ(fastrange32(123, 1), 0U);
EXPECT_EQ(fastrange32(0xffffffff, 1), 0U);
// Two range
EXPECT_EQ(fastrange32(0, 2), 0U);
EXPECT_EQ(fastrange32(123, 2), 0U);
EXPECT_EQ(fastrange32(0x7fffffff, 2), 0U);
EXPECT_EQ(fastrange32(0x80000000, 2), 1U);
EXPECT_EQ(fastrange32(0xffffffff, 2), 1U);
// Seven range
EXPECT_EQ(fastrange32(0, 7), 0U);
EXPECT_EQ(fastrange32(123, 7), 0U);
EXPECT_EQ(fastrange32(613566756, 7), 0U);
EXPECT_EQ(fastrange32(613566757, 7), 1U);
EXPECT_EQ(fastrange32(1227133513, 7), 1U);
EXPECT_EQ(fastrange32(1227133514, 7), 2U);
// etc.
EXPECT_EQ(fastrange32(0xffffffff, 7), 6U);
// Big
EXPECT_EQ(fastrange32(1, 0x80000000), 0U);
EXPECT_EQ(fastrange32(2, 0x80000000), 1U);
EXPECT_EQ(fastrange32(4, 0x7fffffff), 1U);
EXPECT_EQ(fastrange32(4, 0x80000000), 2U);
EXPECT_EQ(fastrange32(0xffffffff, 0x7fffffff), 0x7ffffffeU);
EXPECT_EQ(fastrange32(0xffffffff, 0x80000000), 0x7fffffffU);
}
TEST(Fastrange64Test, Values) {
using rocksdb::fastrange64;
// Zero range
EXPECT_EQ(fastrange64(0, 0), 0U);
EXPECT_EQ(fastrange64(123, 0), 0U);
EXPECT_EQ(fastrange64(0xffffFFFF, 0), 0U);
EXPECT_EQ(fastrange64(0xffffFFFFffffFFFF, 0), 0U);
// One range
EXPECT_EQ(fastrange64(0, 1), 0U);
EXPECT_EQ(fastrange64(123, 1), 0U);
EXPECT_EQ(fastrange64(0xffffFFFF, 1), 0U);
EXPECT_EQ(fastrange64(0xffffFFFFffffFFFF, 1), 0U);
// Two range
EXPECT_EQ(fastrange64(0, 2), 0U);
EXPECT_EQ(fastrange64(123, 2), 0U);
EXPECT_EQ(fastrange64(0xffffFFFF, 2), 0U);
EXPECT_EQ(fastrange64(0x7fffFFFFffffFFFF, 2), 0U);
EXPECT_EQ(fastrange64(0x8000000000000000, 2), 1U);
EXPECT_EQ(fastrange64(0xffffFFFFffffFFFF, 2), 1U);
// Seven range
EXPECT_EQ(fastrange64(0, 7), 0U);
EXPECT_EQ(fastrange64(123, 7), 0U);
EXPECT_EQ(fastrange64(0xffffFFFF, 7), 0U);
EXPECT_EQ(fastrange64(2635249153387078802, 7), 0U);
EXPECT_EQ(fastrange64(2635249153387078803, 7), 1U);
EXPECT_EQ(fastrange64(5270498306774157604, 7), 1U);
EXPECT_EQ(fastrange64(5270498306774157605, 7), 2U);
EXPECT_EQ(fastrange64(0x7fffFFFFffffFFFF, 7), 3U);
EXPECT_EQ(fastrange64(0x8000000000000000, 7), 3U);
EXPECT_EQ(fastrange64(0xffffFFFFffffFFFF, 7), 6U);
// Big but 32-bit range
EXPECT_EQ(fastrange64(0x100000000, 0x80000000), 0U);
EXPECT_EQ(fastrange64(0x200000000, 0x80000000), 1U);
EXPECT_EQ(fastrange64(0x400000000, 0x7fffFFFF), 1U);
EXPECT_EQ(fastrange64(0x400000000, 0x80000000), 2U);
EXPECT_EQ(fastrange64(0xffffFFFFffffFFFF, 0x7fffFFFF), 0x7fffFFFEU);
EXPECT_EQ(fastrange64(0xffffFFFFffffFFFF, 0x80000000), 0x7fffFFFFU);
// Big, > 32-bit range
#if SIZE_MAX == UINT64_MAX
EXPECT_EQ(fastrange64(0x7fffFFFFffffFFFF, 0x4200000002), 0x2100000000U);
EXPECT_EQ(fastrange64(0x8000000000000000, 0x4200000002), 0x2100000001U);
EXPECT_EQ(fastrange64(0x0000000000000000, 420000000002), 0U);
EXPECT_EQ(fastrange64(0x7fffFFFFffffFFFF, 420000000002), 210000000000U);
EXPECT_EQ(fastrange64(0x8000000000000000, 420000000002), 210000000001U);
EXPECT_EQ(fastrange64(0xffffFFFFffffFFFF, 420000000002), 420000000001U);
EXPECT_EQ(fastrange64(0xffffFFFFffffFFFF, 0xffffFFFFffffFFFF),
0xffffFFFFffffFFFEU);
#endif
}
// for inspection of disassembly
uint32_t fastrange32(uint32_t hash, uint32_t range) {
return rocksdb::fastrange32(hash, range);
}
// for inspection of disassembly
size_t fastrange64(uint64_t hash, size_t range) {
return rocksdb::fastrange64(hash, range);
}
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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