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Assembly language queries

 
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rnanavaty
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Joined: 12 Apr 2006
Posts: 29
Topics: 20
PostPosted: Tue Jun 14, 2011 6:35 am    Post subject: Assembly language queries Reply with quote
1. What are destructive instructions ?

2. If VAR1, VAR2 and VAR3 are three variables defined in sequence like below.

VAR1 DC C'ABC'
VAR2 DC C'D'
VAR3 DC C'PQRSTUVWX'

What will be the impact of instruction

MVC VAR2,VAR1

Will it affect VAR3 values ?

3. Do every DSECT area require definition by USING assembler command ? If yes how?
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Nic Clouston
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Joined: 01 Feb 2007
Posts: 1075
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Location: At Home
PostPosted: Tue Jun 14, 2011 8:26 am    Post subject: Reply with quote
For your second query the number of bytes moved is defined by the first operand (the receiving field) - work it out from there.
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Utility and Program control cards are NOT, repeat NOT, JCL.
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kolusu
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Joined: 26 Nov 2002
Posts: 12382
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Location: San Jose
PostPosted: Tue Jun 14, 2011 10:49 am    Post subject: Reply with quote
rnanavaty,

Check this link

http://www.mainframecoder.com/move.html

Kolusu
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papadi
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Joined: 20 Oct 2009
Posts: 594
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PostPosted: Tue Jun 14, 2011 1:35 pm    Post subject: Reply with quote
Quote:
What are destructive instructions ?
Instructions that cause a "receiving field" to be modified (if i am on the same page).

How do you want to consider registers that are loaded with data or an address. . .

An Add Packed modifies the receiving field. And on and on. . .

Quote:
Do every DSECT area require definition by USING assembler command ?
No.
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di
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