Yeah, true. I guess having grown up worried more about memory than CPU, I'd never have chosen that route, but it's clearly equally valid. Or maybe N R14,=X'00F00000' and then CLM R14,B'0100',=X'80'... whee, I saved 3 bytes! (Also not sure whether two RS instructions are faster than two shifts and a CFI. Of course, now we're *really* discussing minutiae...) (Plus, hey, any time you get to use a sexy new instruction like CFI, a kitten gets its wings. Or something.)
Anyway, thanks. I wanted to be sure I wasn't missing some other, more obvious approach that Everyone Knows (but me)! On Fri, Dec 27, 2013 at 10:26 PM, John Gilmore <jwgli...@gmail.com> wrote: > You can avoid shifts and save one instruction by ANDing the PSW value > with x'00F00000' and testing the result for equality with > x'00800000', but there is not much fat to be squeezed out of what you > are doing now. > > John Gilmore, Ashland, MA 01721 - USA > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > -- zMan -- "I've got a mainframe and I'm not afraid to use it" ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
