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TMS320C5535: Fast return vs. slow return

Part Number: TMS320C5535

The swpu067e CPU guide describes the RET instruction as taking 5 cycles to complete. It then mentions the "Fast" return mode which uses RETA and CFCT registers. I don't see any explanation of how much faster this type of return is. How many cycles is USE_RETA vs. NO_RETA? Thanks.