Function:

FSBP0 Selects the original bank. (default)
FSBP1 Selects bank 1 from <FMUL4X4> instruction diagram
FSBP2 Selects bank 2 from FMUL4X4 instruction diagram
FSBP3 Selects the scratchpad bank3 used by the FMUL4X4 internally.

The FSBP3 instruction is not publicly supported by IIT, it can be used to
select the last bank of registers, which unfortunately cannot be used for
regular operation. However, it is listed for completeness.




FSIN / FCOS   Floating point sine and cosine
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