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 RTF64 processor 
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Joined: Sat Feb 02, 2013 9:40 am
Posts: 1531
Location: Canada
Quote:
Have you already found an example code that justify these two RA rationally ?
I did not find an example, but I heard from another poster that two RA can be handy for implementing something called 'milli-code' routines. I suspect its a case of infrequent usage, but a real pita not to have two regs available. Many RISC type designs allow a GP register to be used so there is more than one register available. PowerPC for instance allows branching to the count register in addition to the link register. I suspect the count register doubles as a second link register sometimes.

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Robert Finch http://www.finitron.ca


Mon Dec 21, 2020 5:32 am WWW
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