36 lines
918 B
C++
36 lines
918 B
C++
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#pragma once
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#include <string>
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namespace deep_gemm {
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static uint64_t fnv1a(const std::string& data, const uint64_t& seed) {
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uint64_t h = seed;
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const uint64_t& prime = 0x100000001b3ull;
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for (const char& c: data) {
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h ^= static_cast<uint8_t>(c);
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h *= prime;
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}
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return h;
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}
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static std::string get_hex_digest(const std::string& data) {
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const auto& state_0 = fnv1a(data, 0xc6a4a7935bd1e995ull);
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const auto& state_1 = fnv1a(data, 0x9e3779b97f4a7c15ull);
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// Split-mix 64
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const auto& split_mix = [](uint64_t z) {
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z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9ull;
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z = (z ^ (z >> 27)) * 0x94d049bb133111ebull;
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return z ^ (z >> 31);
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};
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std::ostringstream oss;
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oss << std::hex << std::setfill('0')
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<< std::setw(16) << split_mix(state_0)
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<< std::setw(16) << split_mix(state_1);
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return oss.str();
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}
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} // namespace deep_gemm
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