Hendrik/xgboost
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Force compressed buffer to be 4 bytes aligned. (#5441)

Browse Source
This commit is contained in:
Jiaming Yuan 2020-03-27 06:43:52 +08:00 committed by GitHub
parent dcf439932a
commit 7146b91d5a
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 8 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
src/common/compressed_iterator.h
View File

@ -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>