what‘s the meaning of rv32imafdc

RISC-V has a modular design, 
	consisting of alternative base parts, 
	with added optional extensions. 

The base specifies instructions (and their encoding), 
	control flow, 
	registers (and their sizes), 
	memory 
	and addressing, 
	logic (i.e., integer) manipulation, 
	and ancillaries. 

The standard extensions 
	are specified to work with all of the standard bases, 
	and with each other without conflict.


Many RISC-V computers might implement the compressed instructions extension 
	to reduce 
		power consumption, 
		code size, 
		and memory use.
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