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Aucbvax.2641 fa.unix-wizards utzoo!decvax!ucbvax!unix-wizards Tue Aug 11 21:37:10 1981 Needed: quick way to do a 16-bit ROR >From JNC Tue Aug 11 21:33:03 1981 This isn't really a UNIX question, but there are a lot of PDP-11 people out there, so here goes: I need a quick way to do a 16 bit ROR. (The ROR instruction itself uses the C bit, for an effective 17 bits). A 16 bit ROL can be performed by the following code: CLC ROL RX ADC RX

but I can't think of an equivalent hack for ROR that's any better than

CLC ROR RX BCC 1$ BIS #100000, RX 1$:

Any ideas? (Improvements to the former are welcome as well!)

Noel

PS Please reply to me, not the whole list! If there is general interest, I will forward the best reply. -------

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