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[f-cpu] FPU size flag

Hi every body,

	We currently define that FPU operand have to different size (32 bits [00] and 
64 bits [01]). It would be nice to specify their name so that we can write 
some sample code with it. Why not using .d for 64 bits (double in C) and 
nothing for 32 bits float (f at the beginning of the instruction already say 
	I reread the chapter named "ISA modularity" and I have a little problem. If 
we trust this paragraph, the SRB is optional, or I think that's totally 
impossible to write an OS without it. I don't know if the idea is to be able 
to create F-CPU where only one application can run or if it's a mistake.


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