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From: Thomas Koenig
Newsgroups: comp.arch
Subject: Re: IBM architectural goals, Byte Addressability And Beyond
Date: Thu, 30 May 2024 15:57:51 -0000 (UTC)
Organization: A noiseless patient Spider
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John Levine schrieb:
> According to Michael S :
>>> Note that the feature was introduced in Znext (2012). That it is
>>> still there must indicate that it gets some usage.
>>
>>Not necessarily.
>>After feature was given publicly documented opcode it's very hard to
>>remove it.
>>Naturally, I don't know if this particular feature got publicly
>>documented opcode and don't know where too look.
>
> They never remove anything from the architecture. If you're asking
> about decimal FP, it's still there, both scalar and vector.
I don't think the vector instructions of the /390 are in there
any more. But those were markeded as extensions, so maybe that
doesn't count. (And they were very underwhelming, so...)