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MVCL with 0 Register

 
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Pankaj Shrivastava
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PostPosted: Fri Jul 24, 2009 6:36 pm    Post subject: MVCL with 0 Register
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I have seen Register 0 as a valid Operand for the source or reciever Address , Wheareas Register 0 as an operand in many instructions just behaves as null operation like :

BALR R,0

Why machine cant resolve the address put in the register 0.
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enrico-sorichetti

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PostPosted: Fri Jul 24, 2009 6:55 pm    Post subject: Reply to: MVCL with 0 Register
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because the manual says so ...
because they ( the designers ) decided so ...
...
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Bill O'Boyle

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PostPosted: Fri Jul 24, 2009 7:01 pm    Post subject: Reply to: MVCL with 0 Register
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Your question relates to an MVCL, but your example questions R0 in a BALR?

R0 (an even register) can be used to house a sending or receiving address in an MVCL.

Bill
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Pankaj Shrivastava
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PostPosted: Fri Jul 24, 2009 7:08 pm    Post subject:
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Hi Bill ,

Yes I intented to say the same thing . R0 can host theh address in MVCL ..but for other instructions it cant host an address and just implies a null. Why did designer allowed R0 to host an address in MVCL and not for any other instructions . Any special reason behind this ?
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enrico-sorichetti

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PostPosted: Fri Jul 24, 2009 7:15 pm    Post subject: Reply to: MVCL with 0 Register
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Quote:
Why did designer allowed R0 to host an address in MVCL and not for any other instructions . Any special reason behind this ?

if You are really feel the need to know...

impendig anorexia
long sleepless nights,
nightmares of bytes losing the parity...
add as many as You want

You can try by searching the US patents data base,
hard to believe but it contains lots of trade secrets icon_biggrin.gif

or look at ...
http://www.research.ibm.com/journal/
IBM systems Journal
IBM journal of research and development


PS
the wrath
Quote:
that all your bytes lose their parity
is my favorite
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Pankaj Shrivastava
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PostPosted: Fri Jul 24, 2009 9:55 pm    Post subject:
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icon_rolleyes.gif thx Enrico ..I will let u knw after consulting those research documents icon_lol.gif
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