OEYO8729@TREARN.BITNET (Cem Turgay) (06/09/89)
> can anyone tell me what 'opsyn' is used for? it seems to me that a > way to redefine (or undefine) standard opcodes would create > maintenance problems. Opsyn is the assembler command. You can use it for make your user synonyms of the assembly commands and it makes very clear and readable your assembly sources. I use it most of my programs. I'll give some examples... MVC OPSYN MOVE L OPSYN LOAD B OPSYN JUMP .. .. .. .. LOAD R2,=F'1' MOVE FIRST,SECOND JUMP GOOUT .. .. ********************************************************don't*worry***** * Agean University * Cem Turgay * * * * * * Computer Research & * OEYO8729 @ TREARN * * * * * * Practice Center * Izmir - TURKEY * * * * * * * * Computer programming **************************** * * * * * * * student. * I know that I don't know * * * * * ***********************************************************be*happy*****
OEYO8729@TREARN.BITNET (Cem TURGAY) (06/13/89)
> Arrggghhh. How can you ever use IBM-supplied macros if you do this ???
Sorry, but we haven't Ibm supplied macros JUMP, MOVE or LOAD !!!
I can use that optional synonyms very effective...
Cem Turgay Oeyo8729@TrearnLDW@USCMVSA.BITNET (Leonard D Woren) (06/13/89)
> > Arrggghhh. How can you ever use IBM-supplied macros if you do this ??? > > Sorry, but we haven't Ibm supplied macros JUMP, MOVE or LOAD !!! > I can use that optional synonyms very effective... That's not what I meant. What happens when you use an IBM-supplied macro that GENERATES the real opcodes, and you have OPSYN'd them out of existance?
OEYO8729@TREARN.BITNET (Cem TURGAY) (06/14/89)
#1 > Arrggghhh. How can you ever use IBM-supplied macros if you do this ?? > #2 > Sorry, but we haven't Ibm supplied macros JUMP, MOVE or LOAD !!! > I can use that optional synonyms very effective... > #3 > That's not what I meant. What happens when you use an IBM-supplied > macro that GENERATES the real opcodes, and you have OPSYN'd them out > of existance? So sory, I missunderstand your one line question. (my bad English) 8-| I meant that synonyms are optional. When you define your Opsyn, you can use both of real opcode and synonym opcode. You can also use Ibm macros without worry. Example, MOVE OPSYN MVC USING *,15 MOVE BUFF(8),=CL8'CEM' MVC BUFF+8(8),=CL8'TURGAY' WRTERM BUFF,80 BR 14 BUFF DS CL80 END ********************************************************don't*worry***** * Agean University * Cem Turgay * * * * * * Computer Research & * OEYO8729 @ TREARN * * * * * * Practice Center * Izmir - TURKEY * * * * * * * * Computer programming **************************** * * * * * * * student. * I know that I don't know * * * * * ***********************************************************be*happy*****
MICHAEL@MAINE.BITNET (Michael Johnson) (06/16/89)
There is one very good reason that I can think of NOT to use the OPSYN directive in the way that you, Cem, suggest. This is the simple fact that by so doing you are probably going to make it immensely difficult for anyone to later understand and successfully enhance your code, should that ever be necessary. One of the cardinal rules of good programming is that you should not use obscure tricks if you don't have to and if you do have to, you should explain as fully as you can what you are doing. I dare say renaming the opcodes of the 370 instruction set counts as an unnecessary trick. Michael Johnson "We are the Priests of the Temples University of Maine System of Syrinx. Our great computers fill Computing and Data Processing Services the hallowed halls." - Neil Peart