Scalar fdiv, fsqrt

[pentin-as]

Should hwacha support scalar fdiv and fsqrt?

At now, when trying to execute these instructions, hwacha "hangs". This is because the FPU from Rocket does not form resp.valid. Instead, it forms nack_mem.

But nack_mem does not exist in rocc (and in hwacha logic).

Here it is in FPUIO:

So should hwacha work with these instructions?