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Add a portable log2 function for integers

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Gael Guennebaud
2014-09-17 09:56:07 +02:00
parent 0f0580b97c
commit fc23e93707
2 changed files with 16 additions and 1 deletions
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2
Eigen/src/SparseCore/ConservativeSparseSparseProduct.h
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@@ -101,7 +101,7 @@ static void conservative_sparse_sparse_product_impl(const Lhs& lhs, const Rhs& r
// otherwise => loop through the entire vector
// In order to avoid to perform an expensive log2 when the
// result is clearly very sparse we use a linear bound up to 200.
if((nnz<200 && nnz<t200) || nnz * log2(nnz) < t)
if((nnz<200 && nnz<t200) || nnz * numext::log2(int(nnz)) < t)
{
if(nnz>1) std::sort(indices,indices+nnz);
for(Index k=0; k<nnz; ++k)