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Programming > Assembly 370 > Re: S/360
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Re: S/360

by glen herrmannsfeldt <gah@[EMAIL PROTECTED] > Dec 20, 2005 at 12:43 AM

robin wrote:
> "John W. Kennedy" <jwkenne@[EMAIL PROTECTED]
> wrote in message
> news:vYypf.39224$L7.37622@[EMAIL PROTECTED]
>>The guard digit was added to double precision, postnormalization was
>>added to the HER and HDR instructions, and the behavior of overflow and
>>underflow was altered.

> The HE, HER, HD, HDR set was a glaring design error - a faux pas.
> That it failed to post-normalise meant that it couldn't be used
> in a loop to divide by, say, 32.

Well, first there are no HE or HD instructions.

I am pretty sure that HER and HDR will, and always have, done a
one digit ****ft when needed.  It might be that they won't normalize
a previously unnormalized number, but in that rare case using AER
or some other that will normalize should be fine.

(snip)

-- glen
 




 16 Posts in Topic:
Re: S/360
"robin" <rob  2005-12-20 03:51:25 
Re: S/360
glen herrmannsfeldt <g  2005-12-20 00:43:30 
Re: S/360
"John W. Kennedy&quo  2005-12-20 10:08:37 
Re: S/360
"James J. Weinkam&qu  2005-12-20 21:46:26 
Re: S/360
Peter Flass <Peter_Fla  2005-12-21 00:53:26 
Re: S/360
"James J. Weinkam&qu  2005-12-21 07:42:47 
Re: S/360
glen herrmannsfeldt <g  2005-12-20 21:46:21 
Re: S/360
"robin" <rob  2005-12-31 07:39:09 
Re: S/360
glen herrmannsfeldt <g  2006-01-02 12:16:22 
Re: S/360 HER, HDR
"robin" <rob  2006-01-03 01:56:13 
Re: S/360 HER, HDR
glen herrmannsfeldt <g  2006-01-04 02:11:31 
Re: S/360 HER, HDR
"robin" <rob  2006-01-04 15:45:54 
Re: S/360 HER, HDR
glen herrmannsfeldt <g  2006-01-05 00:41:33 
Re: S/360 HER, HDR
"robin" <rob  2006-01-06 00:04:42 
Re: S/360
"John W. Kennedy&quo  2005-12-20 10:08:04 
Re: S/360
"robin" <rob  2005-12-21 07:10:39 

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tan12V112 Tue Oct 7 12:36:01 CDT 2008.