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perf: faster Cache::write_contiguous() (#5715)
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1 changed files with 5 additions and 4 deletions
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@ -74,20 +74,21 @@ int Cache::write_contiguous(CIter const begin, CIter const end) const
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if (end - begin > 1)
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{
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// Yes, there are.
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// copy blocks into contiguous memory
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auto const buflen = std::accumulate(
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begin,
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end,
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size_t{},
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[](size_t sum, auto const& block) { return sum + std::size(*block.buf); });
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buf.reserve(buflen);
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buf.resize(buflen);
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auto* walk = std::data(buf);
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for (auto iter = begin; iter != end; ++iter)
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{
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TR_ASSERT(begin->key.first == iter->key.first);
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TR_ASSERT(begin->key.second + std::distance(begin, iter) == iter->key.second);
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buf.insert(std::end(buf), std::begin(*iter->buf), std::end(*iter->buf));
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walk = std::copy_n(std::data(*iter->buf), std::size(*iter->buf), walk);
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}
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TR_ASSERT(std::size(buf) == buflen);
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TR_ASSERT(std::data(buf) + std::size(buf) == walk);
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out = std::data(buf);
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outlen = std::size(buf);
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}
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