undo slow dgemm/skylake microoptimization
undo slow dgemm/skylake microoptimization

the compare is more costly than the work

xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS