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[Backport branch/3.2.x] Fix calculation of necessary bits in feistel projection #7117

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Merged
miscco merged 2 commits into from
Jan 8, 2026
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[Backport branch/3.2.x] Fix calculation of necessary bits in feistel projection #7117

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1db8550
Fix calculation of necessary bits in feistel projection (#7098)
miscco Jan 8, 2026
59fc9ce
Merge branch 'branch/3.2.x' into backport-7098-to-branch/3.2.x
miscco Jan 8, 2026
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2 changes: 1 addition & 1 deletion libcudacxx/include/cuda/__random/feistel_bijection.h
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Original file line number Diff line number Diff line change
Expand Up @@ -57,7 +57,7 @@ class __feistel_bijection
template <class _RNG>
_CCCL_API __feistel_bijection(uint64_t __num_elements, _RNG&& __gen)
{
const uint64_t __total_bits = (::cuda::std::max) (uint64_t{4}, ::cuda::std::bit_ceil(__num_elements));
const uint64_t __total_bits = static_cast<uint64_t>(::cuda::std::max(4, ::cuda::std::bit_width(__num_elements)));

// Half bits rounded down
__left_side_bits = __total_bits / 2;
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