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speedup for empty subcubes

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This commit is contained in:
conrad
2026-02-25 13:11:14 +10:00
parent e6b06b21da
commit fa52e3f5ef
1 changed files with 8 additions and 5 deletions
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include/armadillo_bits/subview_cube_meat.hpp
+8 -5
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@@ -1704,21 +1704,24 @@ void
subview_cube<eT>::extract(Cube<eT>& out, const subview_cube<eT>& in)
{
arma_debug_sigprint();
// NOTE: we're assuming that the cube has already been set to the correct size and there is no aliasing;
// size setting and alias checking is done by either the Cube constructor or operator=()
const uword n_rows = in.n_rows;
const uword n_cols = in.n_cols;
const uword n_slices = in.n_slices;
const uword n_rows = in.n_rows;
const uword n_cols = in.n_cols;
const uword n_slices = in.n_slices;
const uword n_elem_slice = in.n_elem_slice;
arma_debug_print(arma_str::format("out.n_rows: %u; out.n_cols: %u; out.n_slices: %u; in.m.n_rows: %u; in.m.n_cols: %u; in.m.n_slices: %u") % out.n_rows % out.n_cols % out.n_slices % in.m.n_rows % in.m.n_cols % in.m.n_slices);
if(n_elem_slice == 0) { return; }
if( (in.aux_row1 == 0) && (n_rows == in.m.n_rows) )
{
for(uword s=0; s < n_slices; ++s)
{
arrayops::copy( out.slice_colptr(s,0), in.slice_colptr(s,0), in.n_elem_slice );
arrayops::copy( out.slice_colptr(s,0), in.slice_colptr(s,0), n_elem_slice );
}
return;