message: Default initialize offsets to avoid UB
  If col/row is padded, uninitialized orig_r/orig_c can be used base_idx calculation
diff: @@ -364,8 +364,8 @@ struct gemm_pack_colmajor_block<
  // Original input column and row after applying all non-standard strides and
  // dilations. Computed by padOrSkip{Row,Col}.
  - Index orig_c;
  - Index orig_r;
  + Index orig_c = 0;
  + Index orig_r = 0;
  for (StorageIndex col = 0; col < cols; ++col) {
  SubMapper lm = rhs.getLinearMapper(0, col);
  