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Modified hash to make it more independent of the choice of test names.
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@ -22,24 +22,27 @@ namespace Catch {
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namespace {
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struct TestHasher {
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explicit TestHasher(Catch::SimplePcg32& rng_instance) {
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basis = rng_instance();
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basis <<= 32;
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basis |= rng_instance();
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using hash_t = uint64_t;
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explicit TestHasher(hash_t seed): m_seed{seed} {
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}
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uint64_t basis;
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uint64_t operator()(TestCase const& t) const {
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// Modified FNV-1a hash
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static constexpr uint64_t prime = 1099511628211;
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uint64_t hash = basis;
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for (const char c : t.name) {
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hash_t operator()(TestCase const& t) const {
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// FNV-1a hash with multiplication fold.
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const hash_t prime = 1099511628211u;
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hash_t hash = 14695981039346656037u;
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for ( const char c : t.name ) {
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hash ^= c;
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hash *= prime;
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}
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return hash;
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hash ^= m_seed;
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hash *= prime;
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const uint32_t low{ static_cast<uint32_t>( hash ) };
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const uint32_t high{ static_cast<uint32_t>( hash >> 32 ) };
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return hash_t{ low * high };
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}
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private:
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hash_t m_seed;
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};
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} // end unnamed namespace
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@ -58,9 +61,9 @@ namespace Catch {
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case RunTests::InRandomOrder: {
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seedRng( config );
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TestHasher h( rng() );
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TestHasher h{ config.rngSeed() };
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using hashedTest = std::pair<uint64_t, TestCase const*>;
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using hashedTest = std::pair<TestHasher::hash_t, TestCase const*>;
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std::vector<hashedTest> indexed_tests;
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indexed_tests.reserve( unsortedTestCases.size() );
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