Re: IBM architectural goals, Byte Addressability And Beyond

On Thu, 30 May 2024 15:06:35 -0000 (UTC)
John Levine <johnl@taugh.com> wrote:

According to Michael S  <already5chosen@yahoo.com>:

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 was talking/asking about CU14. I never had doubts about decimal
stuff.
You did mentioned that CU14 is a public instruction in your other
post. It means that it can't be removed even if later proven useless.