Thank you.
Finally something that makes the author's intentions clear.
(rant)
But, an unqualified "All previously existing format-RSE and format-RXE
instructions are changed - - - "
should be read as written.
The reader should not need to read into the paragraph what is not there.
The words
On 1/17/2017 7:38 AM, somitcw wrote:
Does IBM plan to back-off the change from RXE to RXY and
go in a different direction or are they just sloppy about keeping
the first part of the manual insync with the rest?
According to Dan Greiner, the Principles of Operation is accurate and
IBM is
How bizarre. I assumed that the RXE->RXY transition was fundamental, and
RXE-format was completely superseded.
The -10 version of PoOp still shows RXE format for BFP instructions. There
are a couple of odd DFP instructions that are documented as RXE, but DFP is
mostly register-only. HFP of
Ref: Your note of Tue, 17 Jan 2017 10:38:47 -0500
It appears that the Summary of Changes is incorrect. The
floating point RXE instructions did not change to RXY format.
Jonathan Scott
IBM Hursley, UK
SA22-7832-02.zArch.Principles.of.Operations.Jun.2003.pdf
claims:
Page xxii to xxiii
"All previously existing format-RSE and
format-RXE instructions are changed to be
of formats RSY and RXY, respectively, by
use of a previously unused byte in the
instructions. These changes are not
marked by a bar
