return early if there are no non-zero elements

2025-06-29 22:52:33 +10:00
parent a902935f11
commit e7bd7e4e18
1 changed files with 4 additions and 0 deletions
@@ -1408,6 +1408,8 @@ accu(const SpOp<T1, spop_square>& expr)
    {
    const SpSubview_col<eT>& svcol = reinterpret_cast<const SpSubview_col<eT>&>(expr.m);
    
+    if(svcol.n_nonzero == 0)  { return eT(0); }
+    
    if(svcol.n_rows == svcol.m.n_rows)
      {
      arma_debug_print("accu(): SpSubview_col spop_square optimisation");
@@ -1460,6 +1462,8 @@ accu_spop_omit_helper(const T1& expr, functor is_omitted)
    {
    const SpSubview_col<eT>& svcol = reinterpret_cast<const SpSubview_col<eT>&>(expr);
    
+    if(svcol.n_nonzero == 0)  { return eT(0); }
+    
    if(svcol.n_rows == svcol.m.n_rows)
      {
      arma_debug_print("accu_spop_omit_helper(): SpSubview_col optimisation");