FP register required to be loaded. The block of memory from which the
registers are loaded is contiguous (no gaps): any FP register which has
a corresponding zero bit in `r3` is *unaltered*. In essence this is a
FP register required to be loaded. The block of memory from which the
registers are loaded is contiguous (no gaps): any FP register which has
a corresponding zero bit in `r3` is *unaltered*. In essence this is a