Point taken, and I have to agree that your sample coding technique will work just fine.
However, I prefer to let the assembler work for me, and to not spend my time manually coding up all the parms and bits and such for macros, so that when they expand all that is left to expand is an SVC. Todd ----- Original Message ----- From: "Robert A. Rosenberg" <[EMAIL PROTECTED]> Newsgroups: bit.listserv.ibm-main To: <IBM-MAIN@BAMA.UA.EDU> Sent: Tuesday, February 21, 2006 1:40 PM Subject: Re: z/Architecture Principles of Operation (SA22-7832-04) > At 11:51 -0600 on 02/21/2006, Todd Burch wrote about Re: > z/Architecture Principles of Operation (SA22-7832-04): > > >Certainly I can do that. And, when I do that, I have absolutely no need for > >the LDF instructions. > > > >The purpose of the Long Displacement Facility is to provide relief for base > >register constraint. Coding a "LAY R1" to get around a macro expansion, and > >taking up a base register to do that, doesn't buy me diddly squat in terms > >of "base register relief". > > R1 IS the register that is loaded by the MF=(E,LIST) parm. Thus > loading it via a LAY and coding MF=(E,(1)) tells the Macro to not > generate the LA 1,List (since R1 has already been loaded). There is > no EXTRA register used. Here are the expansions for your review. > > 000000 00000 00014 1 TESTMF CSECT > R:C 00000 2 USING *,12 > 3 WTO MF=(E,LIST) > 000000 4110 C010 00010 7+ LA 1,LIST > 000004 0A23 8+ SVC 35 > 000006 E310 C010 0071 00010 9 LAY 1,LIST > 10 WTO MF=(E,(1)) > 00000C 0A23 14+ SVC 35 > 000010 15 LIST DS F > 16 END > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
