Use vectorization to pack matrix operands

Submitted by Benoit Steiner

Assigned to Nobody

Link to original bugzilla bug (#717)
Version: 3.2

Description

Created attachment 408
patch against eigen 3.2

gemm_pack_rhs<Scalar, Index, nr, RowMajor, Conjugate, PanelMode>::operator() could leverage vectorized instructions when nr == PacketSize. The attached patch does this, which leads to a small speedup when multiplying a large col major matrix with a large row major matrix.

Patch 408, "patch against eigen 3.2":
rhs_packing.patch