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Register Sizes and Usage

 
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Harsh Pawar

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Joined: 04 Jun 2008
Posts: 25
Location: Noida

PostPosted: Tue Jul 21, 2009 10:36 am    Post subject:
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I have some questions:

1) Some times we say 8 bytes registers and sometimes we say 4 bytes. On what factor the register size depends?? is it addressing mode or is it architecture (like Z/os has 8 bytes register) ?

2)When we give addressing mode (AMODE) = 31 then what is the need of specifying RMODE?

3)We can address 32 bits from a 4 byte register then what is the need of 8 byte registers ?

I know these are very basic questions but i am curious icon_question.gif
Thanks for helping.

Regards,
Harry
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dick scherrer

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Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

PostPosted: Tue Jul 21, 2009 11:35 am    Post subject:
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Hello,

When you have a question, you should start a new topic for your question rather than post a reply to some 3-year old, inactive topic.

You might look at this previous topic as it explains some of what you are asking about.
http://ibmmainframes.com/viewtopic.php?t=10564

Please post a reply here if something is not clear.
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Harsh Pawar

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Joined: 04 Jun 2008
Posts: 25
Location: Noida

PostPosted: Tue Jul 21, 2009 12:49 pm    Post subject:
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Thanks , that answers all....... icon_smile.gif
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dick scherrer

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PostPosted: Tue Jul 21, 2009 9:31 pm    Post subject: Reply to: Register Sizes and Usage
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You're welcome icon_smile.gif

d
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