Re: Placeholder Instruction
So put a comment statement * CONTINUE Or make a CONTINUE macro MACRO , CONTINUE , MEND , On Tue, 26 Sep 2023 09:26:18 -0400 Dave Clark wrote: :>"IBM Mainframe Assembler List" wrote on :>09/25/2023 05:55:23 PM: :>> Just put another WHEN right after it. :>> :>> :>> SELECT :>>WHEN 1 :>> something :>>WHEN 2 :>>WHEN 3 :>> something :>>ENDSEL , :>> :>> No need for a placeholder instruction. :> :> :>Thanks. Yes, that would work but I don't like how it looks. :>Because, to a COBOL programmer, it looks like an OR condition as it is in :>COBOL. I wanted the placeholder instruction so that even a COBOL :>programmer won't mistake the intent. :> :> :>Sincerely, :> :>Dave Clark -- Binyamin Dissen http://www.dissensoftware.com Director, Dissen Software, Bar & Grill - Israel
Re: Placeholder Instruction
On 9/26/23 08:21:32, Martin Ward wrote: On 26/09/2023 14:54, Paul Gilmartin wrote: It wold be futile to attempt to write a C program with semantics of a FORTRAN program. It's futile to write an Assembler program which would work if it were COBOL. Polyglot would beg to differ: https://ideology.com.au/polyglot/ But it doesn't mention Assembler (or Rexx.) ANOP would be a good placeholder candidate except for the requirement for a sequence symbol. Would it be a good Idea to make the sequence symbol optional? Would that compromise error reporting? Would it be a good Idea to allow CNOP 0,1? Would that compromise error reporting? Or just define an instream null macro. -- gil
Re: Placeholder Instruction
Martin, thanks for posting that interesting link to polyglot! Kerry Liles On Tue, Sep 26, 2023, 10:21 AM Martin Ward wrote: > On 26/09/2023 14:54, Paul Gilmartin wrote: > > It wold be futile to attempt to write a C program with > > semantics of a FORTRAN program. It's futile to write > > an Assembler program which would work if it were COBOL. > > Polyglot would beg to differ: https://ideology.com.au/polyglot/ > > :-) > > -- > Martin > > Dr Martin Ward | Email: mar...@gkc.org.uk | http://www.gkc.org.uk > G.K.Chesterton site: http://www.gkc.org.uk/gkc | Erdos number: 4 >
Re: Placeholder Instruction
On 26/09/2023 14:54, Paul Gilmartin wrote: It wold be futile to attempt to write a C program with semantics of a FORTRAN program. It's futile to write an Assembler program which would work if it were COBOL. Polyglot would beg to differ: https://ideology.com.au/polyglot/ :-) -- Martin Dr Martin Ward | Email: mar...@gkc.org.uk | http://www.gkc.org.uk G.K.Chesterton site: http://www.gkc.org.uk/gkc | Erdos number: 4
Re: Placeholder Instruction
"IBM Mainframe Assembler List" wrote on 09/26/2023 09:54:44 AM: > Do you have a distaste for comments? Comments are your > friend. Add a comment explaining what you're doing. No, I do not have a distaste for comments. I like comments. I just prefer the look of the following over the alternative. (This is my current code for a 3270 channel appendage routine as previously discussed -- however, this is still not giving me the results I am looking for, which is a true wait for a 3270 attention interrupt.) STR6,SUPVR6SAVE SUPVR. WORK REG. XRR6,R6CLEAR WORK REGISTER ICM R6,B'0111',X'41'(R0) GET PENDING CCW ADDR. SELECT SELECT CONDITION WHEN x'44'(R0),(ON,TM),x'80' WHEN INTERRUPT IS ATTN MVC x'44'(2,R0),=x'0C00' SET CE+DE AND DEQUE WHEN X'44'(R0),EQ,X'08' WHEN INTERRUPT IS CH END NOPR 0 DO NOTHING AND DEQUE<=== WHEN X'44'(R0),EQ,X'04',AND, WHEN INTERRUPT IS DEVEND * R6,(Z,LTR),R6AND NO PENDING CCW MVC x'44'(2,R0),=x'0600' SET DE+UC AND DEQUE WHEN x'44'(R0),EQ,x'0C',AND, WHEN INTERRUPT IS CE+DE* R6,(Z,LTR),R6AND NO PENDING CCW MVC x'44'(2,R0),=x'0F00' SET CE+DE+UC+UE AND DEQUE WHEN OTHERWITH PENDING CCW SL R6,=F'8' GET PREV. CCW ADDR. IF 0(R6),EQ,x'03'IF CCW IS MY NOOP IF 0(R1),(NOT,TM),x'80' IF CCB NOT FLAGGED MVC x'44'(2,R0),=x'0080' CHANGE TO PCI OI 0(R1),x'80' FLAG THE CCB L R6,SUPVR6 RESTORE SUPVR. WORK REG. B 0(,R7) REQUEUE AND RETRY ENDIF ENDIF NI 0(R1),x'FF'-x'80' REMOVE CCB FLAG ENDIF ENDIF ENDSL END SELECT L R6,SUPVR6RESTORE SUPVR. WORK REG. B 4(,R7) DEQUEUE AND CONTINUE Sincerely, Dave Clark -- int.ext: 91078 direct: (937) 531-6378 home: (937) 751-3300 Winsupply Group Services 3110 Kettering Boulevard Dayton, Ohio 45439 USA (937) 294-5331 * This email message and any attachments is for use only by the named addressee(s) and may contain confidential, privileged and/or proprietary information. If you have received this message in error, please immediately notify the sender and delete and destroy the message and all copies. All unauthorized direct or indirect use or disclosure of this message is strictly prohibited. No right to confidentiality or privilege is waived or lost by any error in transmission. *
Re: Placeholder Instruction
On 9/26/23 07:26:18, Dave Clark wrote: "IBM Mainframe Assembler List" wrote on 09/25/2023 05:55:23 PM: Just put another WHEN right after it. SELECT WHEN 1 something WHEN 2 WHEN 3 something ENDSEL , No need for a placeholder instruction. Thanks. Yes, that would work but I don't like how it looks. Because, to a COBOL programmer, it looks like an OR condition as it is in COBOL. I wanted the placeholder instruction so that even a COBOL programmer won't mistake the intent. Would Assembler accept "WHEN 3 AND NOT 2"? Various programming languages have different semantics for constructs that appear similar. For example: CONTINUE in FORTRAN is quite different from continue in C. It wold be futile to attempt to write a C program with semantics of a FORTRAN program. It's futile to write an Assembler program which would work if it were COBOL. Do you have a distaste for comments? Comments are your friend. Add a comment explaining what you're doing. -- gil
Re: Placeholder Instruction
"IBM Mainframe Assembler List" wrote on 09/25/2023 05:55:23 PM: > Just put another WHEN right after it. > > > SELECT >WHEN 1 > something >WHEN 2 >WHEN 3 > something >ENDSEL , > > No need for a placeholder instruction. Thanks. Yes, that would work but I don't like how it looks. Because, to a COBOL programmer, it looks like an OR condition as it is in COBOL. I wanted the placeholder instruction so that even a COBOL programmer won't mistake the intent. Sincerely, Dave Clark -- int.ext: 91078 direct: (937) 531-6378 home: (937) 751-3300 Winsupply Group Services 3110 Kettering Boulevard Dayton, Ohio 45439 USA (937) 294-5331 > > -- > Binyamin Dissen > https://urldefense.com/v3/__http://www.dissensoftware.com__;!! > E0nbmg29qrX0lQ! > a5fMeZw5lZjgqOCH9F55Qn08KurStICbXuMtntGXO9aCBKkuhZBcu3U9_fYRrKVMfABUipHum_3Z93UQdqBllxMMtg > $ > > Director, Dissen Software, Bar & Grill - Israel * This email message and any attachments is for use only by the named addressee(s) and may contain confidential, privileged and/or proprietary information. If you have received this message in error, please immediately notify the sender and delete and destroy the message and all copies. All unauthorized direct or indirect use or disclosure of this message is strictly prohibited. No right to confidentiality or privilege is waived or lost by any error in transmission. *
Re: Placeholder Instruction
The macro does not know if there are any instructions in between. You are describing WHEN (2,3) On Tue, 26 Sep 2023 05:42:27 + Rene BRANDT <14a2846c6667-dmarc-requ...@listserv.uga.edu> wrote: :> hi, :> :>It's not the same between these 2 : :> :>WHEN 2 :> CONTINUE :>WHEN 3 :> ... :>in this case CONTINUE is a BRANCH to END-EVALUATE :> :>and :>WHEN 2 :>WHEN 3 :>in this case WHEN 2 execute the same instruction as WHEN 3 :> :>HTH :>René Le lundi 25 septembre 2023 à 23:55:30 UTC+2, Binyamin Dissen a écrit : :> :> On Mon, 25 Sep 2023 16:32:57 -0400 Dave Clark :>wrote: :> :>:> In COBOL, an EVALUATE-WHEN-END-EVALUATE construct can use the :>:>CONTINUE verb as a placeholder where you would normally need an imperative :>:>statement. Well, in ASSEMBLER I have a SELECT-WHEN-ENDSL construct in :>:>which I now need the same kind of placeholder instruction. In storage I :>:>have used CNOP for alignment purposes but I don't think that is what I :>:>want in this case. I know there are a number of instructions (compare, :>:>branch, etc) that CAN be used as such a placeholder but the manual says :>:>these are not the best way to do that kind of thing. But it doesn't say :>:>what IS the best way to do this and I don't see a NOP or NOOP -- as I :>:>would expect. What am I missing?!? :> :>Just put another WHEN right after it. :> :> :> SELECT :> WHEN 1 :> something :> WHEN 2 :> WHEN 3 :> something :> ENDSEL , :> :>No need for a placeholder instruction. -- Binyamin Dissen http://www.dissensoftware.com Director, Dissen Software, Bar & Grill - Israel
Re: Placeholder Instruction
hi, It's not the same between these 2 : WHEN 2 CONTINUE WHEN 3 ... in this case CONTINUE is a BRANCH to END-EVALUATE and WHEN 2 WHEN 3 in this case WHEN 2 execute the same instruction as WHEN 3 HTH René Le lundi 25 septembre 2023 à 23:55:30 UTC+2, Binyamin Dissen a écrit : On Mon, 25 Sep 2023 16:32:57 -0400 Dave Clark wrote: :> In COBOL, an EVALUATE-WHEN-END-EVALUATE construct can use the :>CONTINUE verb as a placeholder where you would normally need an imperative :>statement. Well, in ASSEMBLER I have a SELECT-WHEN-ENDSL construct in :>which I now need the same kind of placeholder instruction. In storage I :>have used CNOP for alignment purposes but I don't think that is what I :>want in this case. I know there are a number of instructions (compare, :>branch, etc) that CAN be used as such a placeholder but the manual says :>these are not the best way to do that kind of thing. But it doesn't say :>what IS the best way to do this and I don't see a NOP or NOOP -- as I :>would expect. What am I missing?!? Just put another WHEN right after it. SELECT WHEN 1 something WHEN 2 WHEN 3 something ENDSEL , No need for a placeholder instruction. -- Binyamin Dissen http://www.dissensoftware.com Director, Dissen Software, Bar & Grill - Israel
Re: Placeholder Instruction
On Mon, 25 Sep 2023 16:32:57 -0400 Dave Clark wrote: :>In COBOL, an EVALUATE-WHEN-END-EVALUATE construct can use the :>CONTINUE verb as a placeholder where you would normally need an imperative :>statement. Well, in ASSEMBLER I have a SELECT-WHEN-ENDSL construct in :>which I now need the same kind of placeholder instruction. In storage I :>have used CNOP for alignment purposes but I don't think that is what I :>want in this case. I know there are a number of instructions (compare, :>branch, etc) that CAN be used as such a placeholder but the manual says :>these are not the best way to do that kind of thing. But it doesn't say :>what IS the best way to do this and I don't see a NOP or NOOP -- as I :>would expect. What am I missing?!? Just put another WHEN right after it. SELECT WHEN 1 something WHEN 2 WHEN 3 something ENDSEL , No need for a placeholder instruction. -- Binyamin Dissen http://www.dissensoftware.com Director, Dissen Software, Bar & Grill - Israel
Re: [EXTERNAL SENDER] Re: Placeholder Instruction
"IBM Mainframe Assembler List" wrote on 09/25/2023 04:44:08 PM: > What do you need other than one of: > BCR 0,0 > DS0H > ??? I found what I wanted in a different manual. I'm using NOPR 0 for this. Sincerely, Dave Clark -- int.ext: 91078 direct: (937) 531-6378 home: (937) 751-3300 Winsupply Group Services 3110 Kettering Boulevard Dayton, Ohio 45439 USA (937) 294-5331 * This email message and any attachments is for use only by the named addressee(s) and may contain confidential, privileged and/or proprietary information. If you have received this message in error, please immediately notify the sender and delete and destroy the message and all copies. All unauthorized direct or indirect use or disclosure of this message is strictly prohibited. No right to confidentiality or privilege is waived or lost by any error in transmission. *
Re: Placeholder Instruction
On 9/25/23 14:32:57, Dave Clark wrote: In COBOL, an EVALUATE-WHEN-END-EVALUATE construct can use the CONTINUE verb as a placeholder where you would normally need an imperative statement. Well, in ASSEMBLER I have a SELECT-WHEN-ENDSL construct in which I now need the same kind of placeholder instruction. In storage I have used CNOP for alignment purposes but I don't think that is what I want in this case. I know there are a number of instructions (compare, branch, etc) that CAN be used as such a placeholder but the manual says these are not the best way to do that kind of thing. But it doesn't say what IS the best way to do this and I don't see a NOP or NOOP -- as I would expect. What am I missing?!? What do you need other than one of: BCR 0,0 DS0H ??? -- gil
