FM / util

/srv/osrm/osrm-backend/include/util

Name	Size	Mode	Actions
guidance/	-	0755	rm
alias.hpp	6870	0644	edit dl rm
assert.hpp	1964	0644	edit dl rm
attributes.hpp	357	0644	edit dl rm
bearing.hpp	3964	0644	edit dl rm
bit_range.hpp	2950	0644	edit dl rm
cheap_ruler.hpp	2124	0644	edit dl rm
concurrent_id_map.hpp	2148	0644	edit dl rm
conditional_restrictions.hpp	627	0644	edit dl rm
connectivity_checksum.hpp	1931	0644	edit dl rm
coordinate.hpp	9244	0644	edit dl rm
coordinate_calculation.hpp	16297	0644	edit dl rm
deallocating_vector.hpp	11205	0644	edit dl rm
debug.hpp	5958	0644	edit dl rm
dist_table_wrapper.hpp	2299	0644	edit dl rm
dynamic_graph.hpp	15951	0644	edit dl rm
exception.hpp	5126	0644	edit dl rm
exception_utils.hpp	609	0644	edit dl rm
exclude_flag.hpp	975	0644	edit dl rm
filtered_graph.hpp	5402	0644	edit dl rm
filtered_integer_range.hpp	3097	0644	edit dl rm
fingerprint.hpp	1166	0644	edit dl rm
for_each_indexed.hpp	634	0644	edit dl rm
for_each_pair.hpp	990	0644	edit dl rm
for_each_range.hpp	477	0644	edit dl rm
geojson_debug_logger.hpp	6330	0644	edit dl rm
geojson_debug_policies.hpp	1810	0644	edit dl rm
geojson_debug_policy_toolkit.hpp	3258	0644	edit dl rm
geojson_validation.hpp	2899	0644	edit dl rm
graph_traits.hpp	1245	0644	edit dl rm
graph_utils.hpp	3141	0644	edit dl rm
group_by.hpp	722	0644	edit dl rm
hilbert_value.hpp	3010	0644	edit dl rm
indexed_data.hpp	15039	0644	edit dl rm
integer_range.hpp	3286	0644	edit dl rm
isatty.hpp	610	0644	edit dl rm
json_container.hpp	3181	0644	edit dl rm
json_deep_compare.hpp	4732	0644	edit dl rm
json_renderer.hpp	4160	0644	edit dl rm
json_util.hpp	544	0644	edit dl rm
log.hpp	2187	0644	edit dl rm
lua_util.hpp	891	0644	edit dl rm
matrix_graph_wrapper.hpp	1294	0644	edit dl rm
meminfo.hpp	660	0644	edit dl rm
mmap_file.hpp	2776	0644	edit dl rm
mmap_tar.hpp	1007	0644	edit dl rm
msb.hpp	1178	0644	edit dl rm
node_based_graph.hpp	3530	0644	edit dl rm
opening_hours.hpp	8338	0644	edit dl rm
packed_vector.hpp	21691	0644	edit dl rm
percent.hpp	2106	0644	edit dl rm
permutation.hpp	1991	0644	edit dl rm
query_heap.hpp	10205	0644	edit dl rm
range_table.hpp	7119	0644	edit dl rm
rectangle.hpp	5900	0644	edit dl rm
serialization.hpp	5902	0644	edit dl rm
static_assert.hpp	640	0644	edit dl rm
static_graph.hpp	10702	0644	edit dl rm
static_rtree.hpp	34147	0644	edit dl rm
std_hash.hpp	1035	0644	edit dl rm
string_util.hpp	3400	0644	edit dl rm
tarjan_scc.hpp	6646	0644	edit dl rm
timed_histogram.hpp	2576	0644	edit dl rm
timezones.hpp	1417	0644	edit dl rm
timing_util.hpp	1485	0644	edit dl rm
to_osm_link.hpp	694	0644	edit dl rm
trigonometry_table.hpp	35906	0644	edit dl rm
typedefs.hpp	7627	0644	edit dl rm
vector_tile.hpp	303	0644	edit dl rm
vector_view.hpp	8000	0644	edit dl rm
version.hpp.in	406	0644	edit dl rm
viewport.hpp	1579	0644	edit dl rm
web_mercator.hpp	6480	0644	edit dl rm
xor_fast_hash.hpp	1797	0644	edit dl rm
xor_fast_hash_storage.hpp	2195	0644	edit dl rm

Edit: /srv/osrm/osrm-backend/include/util/xor_fast_hash.hpp (1797B)

#ifndef XOR_FAST_HASH_HPP
#define XOR_FAST_HASH_HPP

#include <boost/assert.hpp>

#include <algorithm>
#include <array>
#include <iterator>
#include <numeric>
#include <random>
#include <vector>

#include <cstdint>

namespace osrm::util
{

/*
    This is an implementation of Tabulation hashing, which has suprising properties like
   universality.
    The space requirement is 2*2^16 = 256 kb of memory, which fits into L2 cache.
    Evaluation boils down to 10 or less assembly instruction on any recent X86 CPU:

1: movq    table2(%rip), %rdx
    2: movl    %edi, %eax
    3: movzwl  %di, %edi
    4: shrl    $16, %eax
    5: movzwl  %ax, %eax
    6: movzbl  (%rdx,%rax), %eax
    7: movq    table1(%rip), %rdx
    8: xorb    (%rdx,%rdi), %al
    9: movzbl  %al, %eax
    10: ret

*/
template <std::size_t MaxNumElements = (1u << 16u)> class XORFastHash
{
    static_assert(MaxNumElements <= (1u << 16u), "only 65536 elements indexable with uint16_t");

std::array<std::uint16_t, MaxNumElements> table1;
    std::array<std::uint16_t, MaxNumElements> table2;

public:
    XORFastHash()
    {
        std::mt19937 generator; // impl. defined but deterministic default seed

std::iota(begin(table1), end(table1), 0u);
        std::shuffle(begin(table1), end(table1), generator);

std::iota(begin(table2), end(table2), 0u);
        std::shuffle(begin(table2), end(table2), generator);
    }

inline std::uint16_t operator()(const std::uint32_t originalValue) const
    {
        std::uint16_t lsb = originalValue & 0xffffu;
        std::uint16_t msb = originalValue >> 16u;

BOOST_ASSERT(lsb < table1.size());
        BOOST_ASSERT(msb < table2.size());

return table1[lsb] ^ table2[msb];
    }
};
} // namespace osrm::util

#endif // XOR_FAST_HASH_HPP

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