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How NOPR works and how this is different from CNOP

IBMMAINFRAMES.com Support Forums -> PL/I & ASSEMBLER

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sheersh

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Joined: 24 May 2008
Posts: 6
Location: Noida

Posted: Wed Jun 04, 2008 12:16 am Post subject: How NOPR works and how this is different from CNOP

I saw in some code... NOPR R0 To ensure boundary allignment....I know CNOP can be used for the same purpose, Please advise how NOPR works and how this is different from CNOP? Thanks Sheersh

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enrico-sorichetti

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Joined: 14 Mar 2007
Posts: 3277
Location: italy

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Please advise how NOPR works and how this is different from CNOP

NOPR is an instruction that gets generated unconditionally

CNOP depending on the alignment requested and the value of the current location counter
will generate the numper of NOPR 0 ( 0700 ) needed to fill the gap

here are the details
http://publib.boulder.ibm.com/infocenter/ratdevz/v7r1m1/index.jsp?topic=/com.ibm.ent.asm.zos.doc/topics/fn1lrmst115.htm

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sheersh

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Joined: 24 May 2008
Posts: 6
Location: Noida

Posted: Wed Jun 04, 2008 12:55 am Post subject:

Thanks for such quick response.... If I've understood correctly.... (DS 0H) will do the same thing as single NOPR.

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