rank_k_asm_d8x4() VMOVAPD alignment problem

[ChenhanYu]

/kernel/x86_64/sandybridge/rank_k_d8x4.hpp

VMOVAPP requires c to be 32 bytes aligned. To use this kernel ldc must multiples of 4.
Still need to decide how to fix this problem.

It seems that rank_k_int_d8x4() does not have this problem.

[jianyuh]

I have similar issues with /kernel/x86_64/sandybridge/stra_k_d8x4.hpp

Currently it requires that matrix C is allocated with 32 bytes aligned.

[ChenhanYu]

I think having C allocated as 32 bytes aligned is not enough. You will still need to have ldc as multiples of 4. I tried (m, n, k) = (9, 4, 1) and I still got a segmentation fault even that I allocated C using aligned allocation.