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Force compressed buffer to be 4 bytes aligned. #5441

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Mar 26, 2020
Merged

Force compressed buffer to be 4 bytes aligned. #5441

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11 changes: 8 additions & 3 deletions src/common/compressed_iterator.h
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Original file line number Diff line number Diff line change
Expand Up @@ -75,11 +75,16 @@ class CompressedBufferWriter {
* \return The calculated buffer size.
*/
static size_t CalculateBufferSize(size_t num_elements, size_t num_symbols) {
const int bits_per_byte = 8;
constexpr int kBitsPerByte = 8;
size_t compressed_size = static_cast<size_t>(std::ceil(
static_cast<double>(detail::SymbolBits(num_symbols) * num_elements) /
bits_per_byte));
return compressed_size + detail::kPadding;
kBitsPerByte));
// Handle atomicOr where input must be unsigned int, hence 4 bytes aligned.
size_t ret =
std::ceil(static_cast<double>(compressed_size + detail::kPadding) /
static_cast<double>(sizeof(unsigned int))) *
sizeof(unsigned int);
return ret;
}

template <typename T>
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