On 15 October 2015 at 13:16, Paul Gilmartin <00000014e0e4a59b-dmarc-requ...@listserv.uga.edu> wrote:
> I recall struggling to backport some code > which used IPM...SPM to older hardware that lacked those instructions. Must've been *very* old hardware... SPM is original with S/360. IPM is much later (XA, iirc, because of issues with BALR and the high byte in 31-bit mode). Before that BALR was the standard way to capture the CC in a register. > I refractured the intervening code so it never changed CC. Fracking...? Tony H.
