Under ROTATE THEN INSERT SELECTED BITS the POP says:
1. Although the bits 2-7 of the I5 field are defined to contain an unsigned binary integer specifying the number of bits that the second operand is rotated to the left, a negative value may be coded which effectively specifies a rotate-right amount. > Date: Fri, 24 Jun 2016 17:54:26 -0400 > From: [email protected] > Subject: Re: Simple assembler question > To: [email protected] > > On 24 June 2016 at 16:23, Blaicher, Christopher Y. > <[email protected]> wrote: > > And there are SRL, SRDL, SRAG and SRLG that rotate right. > > Well, no, they *shift* right. There is no need for any instruction to > rotate right. As I said, I spent an embarassing amount of time > pondering why IBM provided only leftwards rotation, until the penny > dropped. (I guess today it's the pound that's dropped... :-( ) > > Tony H. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
