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Function of Data type Y

 
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nivastech

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Joined: 17 Aug 2007
Posts: 6
Location: Chennai

PostPosted: Wed Oct 21, 2009 12:26 pm    Post subject: Function of Data type Y
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Hi,

Could anyone suggest what is the use of the data type Y in Assembler languge?

I found the follwong code inside an Assembler Macro:-

Example

.C1100 ANOP ,
&LABEL BALR 10,10
DC Y(&REQCODE)
MEXIT ,

Where &REQCODE is one of the parameters passed while calling the MACRO

MACRO ,
&LABEL <Macroname> &REQCODE,
&ACTION=REQUEST
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nivastech

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Joined: 17 Aug 2007
Posts: 6
Location: Chennai

PostPosted: Wed Oct 21, 2009 12:46 pm    Post subject:
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Hi All,

I searched the manual..should have done it before... icon_razz.gif

Y -Address Value of address; normally a halfword

Thanks
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Bill O'Boyle

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Joined: 14 Jan 2008
Posts: 2504
Location: Atlanta, Georgia, USA

PostPosted: Wed Oct 21, 2009 3:50 pm    Post subject: Reply to: Function of Data type Y
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A counterpart to a Y is an AL2. The difference being a Y is halfword aligned whereas, an AL2 is not.

If you're tight for space, the AL2 can save you addressability.

EG:

Code:

BIGAREA  DS   CL4096
BIGAREAL DC   Y(L'BIGAREA)      GENERATES X'1000'
BIGAREAL DC   AL2(L'BIGAREA)    SAME AS ABOVE

Bill
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