At 13:57 -0600 on 02/21/2006, Todd Burch wrote about Re:
z/Architecture Principles of Operation (SA22-7832-04):
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
The sample I supplied was just to show the MF expansion (which was
what you were complaining about). The rest of the Macro Parms would
be coded normally. OTOH, so long as you are trying to go with
baseless coding, you have to worry about the macros that need base
registers for their expansion/parameter-references.
----- 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
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