Makes sense. It does seem to me that I have seen code -- kids, don't try this at home -- that used R14 as a temporary base register on return from a call. You know, back in the pre-branch-relative days when you could be desperate for a base register.
Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Tom Marchant Sent: Monday, June 13, 2016 2:37 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: LINK and high order word of R1 On Mon, 13 Jun 2016 16:14:25 -0500, Tom Marchant wrote: >It seems to me that the low half of 14 should be unchanged as well, but that's >not what the book says. Looking over my correspondence with Peter when he was rewriting Chapter 2, I asked about the low half of R14. He replied, quite correctly, that a caller can't rely on R14 being unchanged upon return from a call, since the call itself changes it. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
