----- Original Message -----
From: "Paul Gilmartin" <[email protected]>
To: <[email protected]>
Sent: Tuesday, August 11, 2020 8:51 AM
On 2020-08-10, at 16:28:28, Steve Smith wrote:
The only difference between SR & SLR is how they set the condition code.
If that could produce a measurable difference in a trillion executions, I'd
love to see it.
However, the newer z models have a whole family of new
instructions which differ from their older counterparts
only by *not* setting CC. Changing CC can be a pipeline
bottleneck.
The reason for setting the CC is to enable the status of the result
to be tested [with a BC instruction].
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